Hawaiian Islands Satellite Interpretation Message

Hawaiian Islands Satellite Interpretation Message
Sat, 13 Nov 2010 12:30:00 -0600

Based on data through 1800 UTC November 13 2010.

A highly amplified jet stream dominates over the central and north Pacific. Strong high pressure at the surface and aloft centered far northeast of the area gives way to a deep upper level trough near the date line extending south to 25°N.

The upper trough is supporting a surface cold front 700 miles northwest of Kauai that is advancing to the east near 15 mph. The front is marked by a 250 mile-wide band of overcast layered clouds centered along 30°N 169°W, 25°N 174°W, and 23°N 180°. Isolated thunderstorms embedded within the front north of 25°N rise to 44 kft.

The front has displaced the subtropical ridge southward to about 350 miles northeast of Kauai. Easterly trade winds are noted in low cloud motions of 20 to 25 mph, though cloud motions veer out of the east southeast just north of the state.

Low cloud coverage follows a typical windward and mauka pattern over much of the main Hawaiian islands this morning. Patches of broken low clouds are confined to windward slopes of Maui, Molokai, and Oahu, while a small band of broken low clouds is producing a greater amount of low clouds over the eastern half of Kauai and its adjacent waters. Few to scattered low clouds are moving across windward waters ahead of a 150 mile band of broken cumulus clouds sitting 100 miles off the windward coasts.

A band of high clouds is obscuring much of the Big Island this morning. The 300 mile-wide high cloud band is being generated by a sharp upper level trough centered from 10°N 177°W to 10°N 160°W then running over Maui and ending at a weak upper low near 26°N 150°W. The upper trough is moving to the southeast slowly and is triggering isolated thunderstorms with tops to 42 kft about 75 miles south of the Big Island from 18°N to 16°N between 158°W and 153°W. Isolated thunderstorms also rise as high as 47 kft south of 14°N between 174°W and 161°W.

Far southeast of the state, a portion of the ITCZ east of 147°W has lifted north of 10°N, reaching 13°N.

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DWROE

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Hawaiian Islands Satellite Interpretation Message

Hawaiian Islands Satellite Interpretation Message
Sat, 13 Nov 2010 06:30:00 -0600

Based on data through 1200 UTC November 13 2010.

Dense high clouds that have time to time blanketed the main Hawaiian islands the past couple of days have thinned somewhat. The bulk of the cirrus now cover the Big Island eastward with just a sliver still standing over the smaller islands. The partial clearing has allow us to view the low clouds situation around the main Hawaiian islands.

Judging from the latest satellite loop, low clouds coverage is scattered to broken over the Kauai channel and adjacent Kauai windward waters. Coverage becomes broken over the windward coastal waters from Oahu to the Big Island. The leeward waters of the smaller islands are scattered to broken. Weather radar shows a small batch of showers making its way onshore of windward Oahu. Scattered but light showers are also reaching windward Maui and Kauai.

The band of showers northeast of Maui and east of the Big Island earlier has undergone some dissipation but still hold a decent amount of showers as it presses on west and southward. The leading edge of this band is now a 100 miles northeast of Maui.

The second area of showers continues to pass well south of the Big Island. The area's northern fringe has brought some scattered showers to eastern Big Island especially the Puna district. The band of high clouds is obscuring the clouds and showers beneath.

The cirrus clouds are located to the right of the upper level trough axis, within 100 miles either side of a line from 14°N 167°W to 18°N 159°W to 18°N 152°W to 18°N 144°W. Also to the right of the upper level trough, an area of layered clouds with isolated thunderstorms within 120 miles either side of a line from 06°N 179°W to 11°N 172°W to 14°N 167°W. The upper level trough axis extends from 06°N 180°E to 16°N 170°W to 19°N 166°W to 21°N 160°W to 22°N 153°W to 23°N 143°W. A couple of thunderstorms are located immediately outside the cirrus and layered clouds.

Scattered moderate thunderstorms are detected between 800 and 1200 miles southeast of the Big Island, within 120 miles either side of a line from 08°N 154°W to 09°N 146°W to 14°N 133°W. The tops of the storms have touched 48000 feet. The area appears to be advancing northwestward slowly.

The leading edge of a cold front is 650 miles away from Kauai. Layered clouds with isolated thunderstorms are present within 120 mile either side of a line from 42°N 160°W to 35°N 165°W to 27°N 172°W. The front continues southwestward as a band of cumulus clouds, 80 miles either side of a line from 27°N 172°W to 22°N 177°W to 21°N 165°E.

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LAU

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Hawaiian Islands Satellite Interpretation Message

Hawaiian Islands Satellite Interpretation Message
Fri, 12 Nov 2010 23:30:00 -0600

Based on data through 0500 UTC November 13 2010.

Dense high clouds continue to blanket the main Hawaiian islands this early Friday evening. Water vapor imagery shows part of an upper level trough lying over Kauai and Oahu. The trough axis continues eastward for a thousand miles to 22°N 143°W, and to the southwest for 1600 miles through 16°N 170°W to 08°N 180°E. To right or east of this trough, you will find mid and high clouds and southwest to west wind flow. Between 180°E and 166°W is an area of multilayered clouds, about 260 miles wide. The area contains a thunderstorm or two. Cirrus clouds, about 350 miles wide, dense in some spots, continued towards the northward including the main Hawaiian islands. The cirrus dissipates east of the Big Island. The trough over part of the state, has eased eastward during the past 12 hours. Otherwise the rest of the trough has been stationary.

Of what we can see, there is an area of showers passing to the south of the Big Island. A bit of its northern fringe though may catch the Kau district. Satellite imagery also show a band of showers between 200 and 350 miles northeast of Maui. The band starts off far east of the Big Island at between 20°N and 17°N at 130°W longitude. The band curves toward the northwest at 19°N 145°W and to the north at 25°N 154°W. The overall movement is slowly toward the west and south.

Based on the widely scattered showers over the Maui windward waters, they are moving toward the west northwest at 20 to 25 mph.

Elsewhere, a cold front is noted between 730 and 1000 miles northwest of Kauai, moving southeast at 20 mph. As part of the front, there is a band of layered clouds with a few embedded thunderstorms, about 130 miles either side of a line from 40°N 162°W to 34°N 165°W to 29°N 173°W. The tops of the thunderstorms extend to 42000 feet. A narrower cloud band, 180 miles wide, and consisting cumulus clouds, continues southwestward from 29°N 173°W to 25°N 180°E to 22°N 170°E.

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LAU

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Hawaiian Islands Satellite Interpretation Message

Hawaiian Islands Satellite Interpretation Message
Fri, 12 Nov 2010 18:30:00 -0600

Based on data through 0000 UTC November 13 2010.

Water vapor imagery shows a northeast through southwest oriented upper level trough that is centered a couple of hundred miles west northwest of Kauai. The trough has been nearly stationary over the past several hours. The main cloud feature associated with this trough is a broad swath of cirrus clouds streaming northeastward on the east side of the upper trough. These high clouds are streaming across most of the main Hawaiian islands with its northern edge moving over the island of Oahu. The northern edge of these cirrus clouds has been shifting slowly southward over the past several hours.

The above mentioned high clouds is helping to obscure the low cloud coverage over and around the main Hawaiian islands. With Kauai being nearly free of high clouds over them patches of low clouds can be seen over north and east facing slopes as well as interior sections of the island. Otherwise the high clouds is making is difficult to see low clouds beneath them but surface observations indicate that there is a typical windward and mauka distribution of low clouds over windward and mauka areas.

Just upwind of the islands lies two areas of showery looking clouds. The first is a small cluster of clouds that lies just to the southeast of the Big Island. On its current track most of these cloud should pass south of the Big Island with the northern edge possibly reaching the Kau coast. A second area is a west northwest through east southeast band of showery looking clouds. This band of clouds is generally moving toward the west with the exception of its west end where clouds are moving more toward the northwest rounding a surface ridge to our north.

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BURKE

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Hawaiian Islands Satellite Interpretation Message

Hawaiian Islands Satellite Interpretation Message
Fri, 12 Nov 2010 12:30:00 -0600

Based on data through 1800 UTC November 12 2010.

Water vapor imagery shows a northeast through southwest oriented upper level trough that is centered about 250 miles west northwest of Kauai. The trough has been nearly stationary over the past several hours. The main cloud feature associated with this trough is a broad swath of cirrus clouds streaming northeastward on the east side of the upper trough. These high clouds are streaming across most of the main Hawaiian islands with its northern edge just brushing the island of Kauai.

The above mentioned high clouds is helping to obscure the low cloud coverage over and around the main Hawaiian islands. With Kauai having the least amount of high clouds over them patches of low clouds can be seen over north and east facing slopes of the island. Low clouds can be seen banked up over the slopes and summits of the Koolau range. Patches of low clouds can also be seen over eastern Molokai. The high clouds were obscuring all of Lanai and Maui. Over the Big Island patches of low clouds can be seen over portions of the Hilo and Puna districts.

Upwind of the islands lies a broad field of scattered to broken low clouds moving westward in moderate trade wind flow.

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BURKE

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Hawaiian Islands Satellite Interpretation Message

Hawaiian Islands Satellite Interpretation Message
Fri, 12 Nov 2010 06:30:00 -0600

Based on data through 1200 UTC November 12 2010.

Cirrus associated with a band located to the south of Oahu at sunset has punched northward, reinforcing the existing cirrus that has been dissipating over the islands. Therefore, the Hawaiian islands remained obscured this hour.

This band of cirrus extends far to the southwest of the Hawaiian islands, with a distance of 1450 miles, starting at 08°N 178°W. The band initially has a width of 160 miles before expanding to 150 miles either side of a line from 14°N 170°W to 17°N 164°W to 18°N 153°W. The band had contained isolated thunderstorms that have since dissipated.

On satellite, just to the north and west of the cirrus, is the upper level trough axis. The northern extent of the trough cuts just to the north of Kauai. Also, abundant stable low clouds is located between 850 and 1700 miles northeast of Maui.

Thin spots in the cirrus over and upwind of the islands offer a small glimpse for the low clouds beneath. The band of showers northeast of Maui has split into two areas where both will miss the smaller of the Hawaiian islands. The leading edge to the second area of showers is now 260 miles east of the Big Island moving slightly south of west at 20 to 25 mph. In between this gap, are widely scattered low clouds. Weather radar is picking up widely scattered showers riding in with the trade wind flow, affecting mostly the windward and mountain areas.

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LAU

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Hawaiian Islands Satellite Interpretation Message

Hawaiian Islands Satellite Interpretation Message
Thu, 11 Nov 2010 18:30:00 -0600

Based on data through 0000 UTC November 12 2010.

Water vapor imagery shows an upper level trough is centered about 300 miles to the west and southwest of Kauai. The trough has been nearly stationary over the past 12 hours. A broad swath of high cirrus clouds are being drawn up from the south on the east side of this upper trough. A good size portion of these high clouds are moving over the main Hawaiian islands. The thickest cloud elements are presently moving over the Big Island while the clouds are a little thinner over the central and west end of the state.

Low cloud coverage over the main Hawaiian islands was primarily covering typical windward and mauka areas. Over Kauai low clouds are covering most windward and interior sections of the island. Over Oahu low clouds are baned up over the slopes and summits of the Koolau range with only patches of low clouds seen over the Waianae slopes and nearby leeward areas. Just a few patches of low clouds are seen over eastern Molokai and interior Lanai. Over Maui a few patches of low clouds are seen over the northern and eastern slopes of Haleakala with a bit more cloud coverage over the slopes and summits of the west Maui mountains. Over the Big Island patches of low clouds are present over portions of the windward slopes from north Kohala southward through the Hilo and Puna districts. Daytime heating has caused low clouds to build up over portions of the Kona and leeward Kohala slopes with a few patches of low clouds seen over the Kau slopes.

Just to the east of the state lies an area of clouds that have a showery appearance to them. The leading edge of these clouds is presently just east of the Big Island. Further upwind of the state lies a broad field of broken stratocumulus clouds that are moving westward at around 20 mph.

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BURKE

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Hawaiian Islands Satellite Interpretation Message

Hawaiian Islands Satellite Interpretation Message
Thu, 11 Nov 2010 12:30:00 -0600

Based on data through 1800 UTC November 11 2010.

Water vapor imagery shows an upper level trough is centered about 300 miles to the west and southwest of Kauai. The trough has been nearly stationary over the past 12 hours. A broad swath of high cirrus clouds are being drawn up from the south on the east side of this upper trough. A good size portion of these high clouds are moving over the main Hawaiian islands. The thickest cloud elements are presently moving over the Big Island while the clouds are a little thinner over the central and west end of the state.

The above mentioned high clouds are attempting to obscure what little in the way of low clouds are currently present over the islands themselves. Over Kauai patches of low clouds can be seen over the eastern slopes. Over Oahu low clouds are baned up over the slopes and summits of the Koolau range. Just a few patches of low clouds are seen over eastern Molokai and northern Lanai. Over Maui a few patches of low clouds are seen over the northern and eastern slopes of Haleakala as well as over the slopes and summits of the west Maui mountains. The above mentioned high clouds are obscuring much of the Big Island but there does appear to be some patches of low clouds along the windward slopes from north Kohala southward through the Hilo and Puna districts.

Further upwind of the state lies a broad field of broken stratocumulus clouds that are moving westward at around 20 mph.

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BURKE

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Hawaiian Islands Satellite Interpretation Message

Hawaiian Islands Satellite Interpretation Message
Wed, 10 Nov 2010 23:30:00 -0600

Based on data through 0500 UTC November 11 2010.

An upper trough west of the main Hawaiian islands has an axis extending through 31°N 163°W and 04°N 180°W. An area of broken to overcast high clouds south and east of a line from 11°N 170°W to 20°N 163°W to 24°N 158°W to 14°N 146°W marks the eastern flank of the trough. These high clouds are affecting the main Hawaiian islands this evening, blocking the view of low clouds there.

Isolated cumulonimbus, CB, embedded within broken layered clouds form a ragged 180 mile wide band north of a line from 07°N 140°W to 08°N 160°W to 04°N 170°W to 04°N 180°W. Between 170°W and 146°W, this cloud band is merged with the area of high clouds mentioned previously.

A ragged 180 to 240 mile wide band of broken layered clouds lies north of a line from 25°N 163°W to 31°N 150°W to 33°N 145°W. This feature, marking a frontal boundary, continues northeastward as a band of scattered to broken high clouds north of a line from 33°N 145°W to 34°N 140°W then beyond toward the mainland. This band has not moved much over the past 12 hours.

Overcast layered clouds north and west of a line from 33°N 180°W to 30°N 172°W to 42°N 154°W mark another frontal boundary. Movement is toward the east at 40 mph near 40°N.

Satellite loop shows a broad anticyclonic circulation at low cloud level south of the first frontal band. The main Hawaiian islands lie near the western edge of this circulation, with embedded low clouds slipping beneath the high cloud cover a hundred miles or so east of Maui and the Big Island. Using gaps in the high clouds in older visible imagery as a guide, it seems that low clouds are rather sparse across leeward portions of Kauai and Oahu. The windward third of Oahu had broken low clouds. Broken to overcast low clouds also covered windward Haleakala slopes on Maui as well as windward west slopes. High clouds are too thick, and have been too thick since late afternoon, to assess low cloud coverage.

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POWELL

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Hawaiian Islands Satellite Interpretation Message

Hawaiian Islands Satellite Interpretation Message
Wed, 10 Nov 2010 18:30:00 -0600

Based on data through 0000 UTC November 11 2010.

A weak front extended through 30°N 157°W to 28°N 165°W then continued southwest as a weak trough to near 25°N 168°W early this afternoon. The front was actually a warm front that was drifting very slowly northward while the trough was nearly stationary.

The accompanying cloud band was about 85 miles wide and consisted of broken to overcast layered clouds. A few isolated thunderstorms were also embedded along the front and trough.

A large swath of broken to overcast cirrus clouds continued to bulge northward over the islands. The northern edge of the arc of high clouds stretched from 10°N 170°W to 20°N 164°W to 23°N 158°W to 16°N 150°W. The area as a whole was drifting slowly northeastward. High clouds have been traversing the state since around mid morning.

Meanwhile, in the lower atmosphere, some patches and small clusters of scattered to broken low clouds continued to move into the state from the east. The low clouds were moving west near 20 miles an hour. Though the low clouds were mainly located along the windward sections and adjacent eastern waters from the Big Island to Oahu, skies were mostly cloudy over the entire state due to the presence of the cirrus high above.

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Hawaiian Islands Satellite Interpretation Message

Hawaiian Islands Satellite Interpretation Message
Wed, 10 Nov 2010 12:30:00 -0600

Based on data through 1800 UTC November 10 2010.

A weak front extended roughly through 30°N 158°W to 26°N 167°W and continued southwest as a weak trough to near 20°N 173°W this morning. The front was nearly stationary as it Sat about 450 miles northwest of Kauai as was the trough. The associated cloud band consisted mostly of broken low and mid level clouds and broken to overcast high clouds.

Isolated thunderstorms were also occasionally popping up within the band. The highest storm tops, near 26°N 167°W, were up near 40000 feet. Water vapor imagery showed a weak upper level low near 26°N 167°W. The low was sliding south-southwestward within a northeast to southwest aligned upper trough from 30°N 167°W to 20°N 180°E.

A large swath of broken to overcast cirrus clouds was nearing the islands from the southwest. The northern edge of the high cloud mass stretched from 10°N 173°W to 21°N 160°W to 13°N 150°W. The cirrus was drifting northeastward toward the state. Strands of cirrus along the leading edge of the swath had just made it over Oahu and the west side of the Big Island.

Meanwhile, a few patches and small clusters of scattered to broken low clouds continued to traverse the island chain from the east. Most of these low clouds were noted along the windward or east side of the island chain from the Big Island to Oahu. Few low clouds were seen beneath the cirrus west of the state except for some broken low clouds over Niihau. At 8 am, the cloudiest skies were over Oahu, east Molokai, east Maui and the windward sections of the Big Island. The low clouds near the islands were moving mainly west near 20 miles an hour.

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Hawaiian Islands Satellite Interpretation Message

Hawaiian Islands Satellite Interpretation Message
Wed, 10 Nov 2010 06:30:00 -0600

Based on data through 1200 UTC November 10 2010.

Water vapor imagery shows an upper level trough located 700 miles east southeast of Hilo and another upper trough 450 miles east of Midway atoll. Both troughs are moving to the east northeast about 25 mph. An upper ridge is positioned over the main Hawaiian islands and extends northeastward over 1000 miles. The subtropical upper level jet is laying west to east across the region south of 15°N. Some high clouds are being pulled northward between 170°W and 160°W from the tropics towards the mid latitude trough over the northwestern Hawaiian islands.

A large area of layered clouds extends in a 350 mile wide band from 21°N 173°W to 30°N 163°W. Within this broad area of clouds, isolated thunderstorms and towering cumulus with tops up to 42000 feet are located within 60 miles either side of a line from 23°N 172°W to 30°N 160°W, crossing about 450 miles northwest of Kauai at its closest point. This larger area of clouds with embedded thunderstorms is moving slowly east at about 10 mph. A cloud deck consisting of mainly high layered cirrus is located south of 18°N between 160°W and 170°W, as near as 250 miles southwest of Honolulu, with more thin wispy cirrus clouds in patches over the western half of the main Hawaiian islands. Isolated thunderstorms with tops to 50000 feet are located along the southern boundary of the area between 12°N and 13°N east of 165°W. Elsewhere across the central Pacific, scattered to broken low topped stratocumulus are the rule.

For the main Hawaiian islands, broken low clouds are over south and east Kauai, the south shore of Oahu and extending along the Koolau mountains and across to Kaneohe bay, the eastern half of Molokai, the windward Maui coast from Hana to oheo, and the windward Big Island coast from cape kumakahi to Laupahoehoe. Broken low cloud plumes are also drifting over the Kaiwi Channel and the windward Maui and Big Island waters. Low cloud tops are estimated at 7500 to 9000 feet throughout the islands. The low cloud movement is to the west northwest at near 15 mph in areas free from the effects of island terrain.

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BRENCHLEY

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Hawaiian Islands Satellite Interpretation Message

Hawaiian Islands Satellite Interpretation Message
Tue, 09 Nov 2010 18:45:00 -0600

Based on data through 0030 UTC November 10 2010.

The low-level flow near the islands has changed little since this morning, veering from an east-southeast direction over waters near and east of the Big Island, to a south-southeast flow near Kauai. Additionally, low clouds over waters east of the islands are moving more quickly than those west of the islands, due to high pressure centered far northeast of the islands, and weak troughing located west of the islands. Low clouds are primarily few to scattered in coverage over near shore waters around the islands, with areas of broken low clouds over select island areas.

With the low level flow near the islands favoring a southeast direction, the smaller islands are in the wind shadow of the Big Island, which has allowed sea breezes to drive the development of broken low clouds along leeward slopes of Kauai and Oahu. The northwestern portion of the island of Kauai, northwest of a line from Princeville to Waimea, and the near shore waters, are covered in broken cumulus /cu/ and stratocumulus /sc/, as are the near shore waters immediately northwest of Niihau. Skies are nearly clear over the remainder of the island. Oahu has broken cu over both the Koolau and Waianae mountain ranges, while the central portion of the island has few to scattered cu. Scattered to broken cu are over windward Molokai slopes, while a narrow ribbon of broken cu is over the western end of the island. Windward slopes of Haleakala are mostly sunny with few cu, but broken cu and sc are over the windward portions of the west Maui mountains, and over the lower leeward slopes of Haleakala. Skies are sunny over Kahoolawe, with broken cu over interior Lanai. Most of the lower slopes of the Big Island are covered in broken to overcast sc and cu, but near shore coastal areas on the east side are mostly sunny, as are the interior and summit areas.

A curved band of broken showery cu lies over waters east of the islands, with the western edge of this 150 mile wide band about 100 miles northeast of the windward shores of Kauai and Oahu. The band lies along a line from 21°N 151°W to 23°N 156°W to 26°N 158°W to 30°N 158°W, and continues to move on a trajectory that would keep this moisture away from the islands. Low clouds over windward waters east of Oahu and Molokai are moving toward the northwest at speeds near 32 mph, with low clouds south of the Big Island moving toward the west at speeds near 22 mph. Low clouds over waters south of Kauai are moving toward the northwest at speeds between 10 and 15 mph.

North of 25°N, the northern portion of the band mentioned above is moving toward the north, ahead of a cold front that is well northwest of the islands, marked by a band of broken to overcast layered clouds, with embedded heavy showers, that is 300 to 500 miles wide. The cloud band is centered along a line from 30°N 163°W to 27°N 167°W to near 26°N 177°W.

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BIRCHARD

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Hawaiian Islands Satellite Interpretation Message

Hawaiian Islands Satellite Interpretation Message
Tue, 09 Nov 2010 12:30:00 -0600

Based on data through 1800 UTC November 9 2010.

The low-level flow near the islands veers from the east-southeast over waters near and east of the Big Island, to a south-southeast flow near Kauai. Low clouds are moving more quickly over windward waters as opposed to leeward waters, due to high pressure centered far northeast of the islands, and weak troughing located west of the islands. Low clouds are primarily scattered over windward waters east of the islands, but scattered to broken cumulus /cu/ and stratocumulus /sc/ are over windward waters east of the Big Island, and over waters south and west of Kauai.

Skies over Kauai are generally partly cloudy, although broken low clouds along the south and west shores are making conditions cloudier than normal for the leeward coasts, and adjacent near shore waters. Aside from a patch of broken cu along the northeast slopes of Mount Waialeale, the remainder of the island is under few to scattered cu and sc, despite the presence of thin cirrus moving over the island from the west. Broken low clouds line the spine of the Koolau ridge on Oahu, with these clouds extending over some windward communities along the eastern shore. The remainder of the island is under mostly sunny skies, with thin cirrus over waters north of the island, and scattered sc over the southwest coast and adjacent near shore waters. Skies over Maui county and near shore waters are mostly sunny this morning, but patches of scattered to broken sc and cu are over windward slopes of Molokai, and over the eastern lower slopes of Haleakala on Maui, near Kipahulu and kaupo. Broken to overcast sc and isolated embedded showery cu are over the lower windward slopes of the Big Island, from Laupahoehoe to Hilo to Volcano to Pahala, and extend up to 50 miles to the east.

A diffuse, 150 mile wide, band of showery cu is northwest- southeast oriented over waters east of the islands, with the western portion of this band 60 to 80 miles east of the windward shores. The band is located along a line from 29°N 159°W to 27°N 159°W to 24°N 157°W to 21°N 154°W to 21°N 148°W, and appears to be moving on a trajectory that would keep this moisture from moving into the islands. Low clouds over windward waters east of Oahu and Molokai are moving toward the northwest at speeds near 30 mph, with low clouds south of the Big Island moving toward the west at speeds near 22 mph. Low clouds over waters south of Kauai are moving toward the northwest at speeds near 18 mph.

North of 25°N, the northern portion of the band mentioned above is moving toward the north, ahead of a cold front that is well northwest of the islands, roughly along a line from 30°N 163°W to 27°N 167°W to 26°N 175°W. Thunderstorms have increased in both coverage and intensity along the front in the last couple of hours, with cloud tops reaching as high as 40 thousand feet. Water vapor imagery highlights a weak trough aloft associated with the front, with a weak trough extending southwestward along a line from 28°N 163°W to 23°N 167°W to 19°N 170°W to 13°N 180. A weak and rather small ridge aloft lies east of this trough, and is currently over the main Hawaiian islands.

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