Hawaiian Islands Satellite Interpretation Message

Hawaiian Islands Satellite Interpretation Message
Tue, 19 Oct 2010 00:30:00 -0500

Based on data through 0500 UTC October 19 2010.

Broken to overcast clouds covered the Kauai Molokai Lanai and Maui mountains, and the length of the Koolau mountains southward over Honolulu and Pearl Harbor. The greatest concentration on clouds was over the Koolau mountains where clouds topping off at 14000 feet were dumping heavy rain. Cloud tops elsewhere over the smaller islands were from 7500 to 8500 feet. All of the clouds were nearly stationary. Skies were clear or there were scattered clouds elsewhere over the smaller islands.

The Big Island was covered with broken to overcast clouds, as were the coastal waters east and west of the island. Over the last hour, there were signs that the clouds were on the decrease which is to be expected at this time of the day. The nearly stationary clouds appeared to be layered with tops near 8000 and 16000 feet.

Clouds were isolated over water south of the islands and scattered over waters north the islands. Cloud tops were near 5000 feet and cloud movement was slightly south of east at 10 mph.

An area of showery broken to overcast low clouds and embedded cumulonimbus clouds, cb, was south and east of a line from 24°N 145°W to 26°N 144°W to 125 miles southeast of the Big Island to 15°N 160°W. The closest cb were about 230 miles southeast of the Big Island. Cb tops were to 45000 feet. The cloud area has been moving toward the west at 10 mph.

North and northwest of the islands along a line from 30°N 157°W to 28°N 160°W to 26°N 169°W was an eastward moving cold front. The front consisted of a 120 mile wide band of broken to overcast towering cumulus, tcu, and isolated cb. Cb tops were near 35000 ft.

Water vapor imagery, which detects moisture above 24000 ft, showed a trough aloft from 30°N 145°W to just northwest of Kauai to 20°N 180°W. The trough was moving to the southeast at 20 mph.

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CRAIG

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Hawaiian Islands Satellite Interpretation Message

Hawaiian Islands Satellite Interpretation Message
Mon, 18 Oct 2010 19:30:00 -0500

Based on data through 0000 UTC October 19 2010.

Cloud cover has increased considerably over the main Hawaiian islands since late last night, especially over the Big Island of Hawaii.

Overcast clouds cover most of the Big Island. These clouds extend upslope almost to the summits of Mauna Kea and Mauna Loa. Clouds remain scattered over the summits of the two big volcanoes and near Cape Kumukahi, near South Point and along the coast and lower slopes from kiholo to Upolu Point. Broken to overcast clouds also cover most of east Maui with scattered clouds along the coast. Clouds remain scattered over most areas of the islands from central Maui to Niihau but there are patchy broken low clouds over mauka areas of west Maui, Lanai, Molokai and Oahu, and over the west slopes of Kauai and Niihau.

Clouds are very isolated over water around the islands. Low clouds near the islands are moving from slightly south of east at 10 mph.

An area of showery broken to overcast low clouds and embedded cumulonimbus clouds, cb, is south and east of a line from 23°N 140°W to 26°N 144°W to 125 miles southeast of the Big Island to 14°N 160°W. The closest cb are about 220 miles southeast of the Big Island. This cloud area has been moving toward the west at 10 mph.

A frontal cloud band lines northwest of a line from 36°N 150°W to 32°N 160°W to 30.5°N 170°W to 31°N 180°W. The frontal band is 150 miles wide and contains showery overcast low clouds and scattered towering cumulus clouds.tcu. The part of the band between 160°W and 170°W has moved south slowly since this morning while the part west of 170°W has been nearly stationary. A prefrontal convergence band is centered from 32°N 155°W, where it merges with the frontal band, to 27°N 170°W. The part of the band east of 165°W is 150 miles wide and contains deep overcast layered clouds and isolated cumulonimbus clouds, cb, with tops to 35000 ft. The part of the band west of 165°W contains showery broken low clouds. The part of the convergence band north of the islands has moved southeast at 20 mph over the past 6 hours.

Water vapor imagery, which shows features mainly above 24000 ft, shows a trough aloft from 30°N 145°W to just northwest of Kauai to 20°N 180°W. The trough has been moving toward the southeast at 20 mph over the past 12 hours.

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DONALDSON

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Hawaiian Islands Satellite Interpretation Message

Hawaiian Islands Satellite Interpretation Message
Mon, 18 Oct 2010 13:30:00 -0500

Based on data through 1800 UTC October 18 2010.

There has been little change in cloud cover around the main Hawaiian islands since late last night. Skies remain mostly clear over the islands from Niihau to Maui, with only a small patches of broken low clouds over windward Kauai and over east Maui near Hana. Radars show little or no precipitation skies are clear over most of the Big Island of Hawaii also, but there are showery overcast low clouds along the coast and lower slopes of the Big Island from Laupahoehoe to Cape Kumukahi to Apua Point, and stable broken to overcast low clouds over the Kona coast from Kailua-Kona to Keahole Point. There are also thin broken high clouds over the Big Island.

Low clouds around the main Hawaiian islands are moving from slightly south of east at 15 mph. There are only isolated low clouds upstream of the islands from Kauai to Maui. The clouds over the east side of the Big Island are part of a cloud area that extends 50 miles northeast and 80 miles southeast of the island.

A frontal cloud band lines northwest of a line from 35°N 152°W to 500 miles north of Kauai to 31°N 180°W. The part of the band east of 164°W contains deep overcast layered clouds and isolated cumulonimbus clouds, cb, with tops to 35000 ft. The part of the band west of 164°W contains broken to overcast low and middle clouds. The part of the band north of the islands has moved south southeast at 20 mph over the past 12 hours.

Water vapor imagery, which shows features mainly above 24000 ft, shows a low aloft about 900 miles northeast of Hilo near 39°N 148°W with a trough from the low to 100 miles northwest of Kauai to 21°N 180°W. The trough has been moving toward the southeast at 20 mph over the past 12 hours.

A 300 mile wide band of broken to overcast high clouds and isolated cb is centered from 300 miles southeast of Hilo to 13°N 138°W. The band has been moving toward the west at 10 mph and the cb have become more active over the past 12 hours, possibly related to the digging trough described above.

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DONALDSON

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Hawaiian Islands Satellite Interpretation Message

Hawaiian Islands Satellite Interpretation Message
Mon, 18 Oct 2010 07:30:00 -0500

Based on data through 1200 UTC October 18 2010.

High pressure centered far NE of the islands near 35°N 145°W has an associated ridge that extends WSW from 30°N 150°W across to 25°N 170°W. Low clouds south of the ridge are moving east at 10 to 20 mph, while north of the ridge low clouds are moving NW at 5 to 10 mph. Low clouds are mostly scattered across the tropical and subtropical central Pacific with a few patches of broken clouds mixed in.

An upper level trough stretches from 30°N 150°W to the southwest over 20°N and the dateline. The low is enhancing some low level cloud growth near 30°N 155°W and also near 21°N 172°W where isolated towering cumulus can be seen on IR satellite imagery.

The subtropical jet is producing layered mid and upper level clouds from the dateline to 167°W between latitudes 8°N and 20°N. The jet snakes across the central Pacific between 10°N and 20°N and is providing upper level support for isolated thunderstorms to form near 15°N 148°W.

Over the islands, windward coasts and slopes have partly to mostly cloudy skies while leeward locations are mostly clear. Some wisps of cirrus are moving from west to east above the state near 30 thousand feet. Satellite and radar show a few patches of showers, one located 50 miles south of Kauai, and another 75 miles north of Maui. Both are moving about 12 mph toward the east. The rest of the coastal water area is partly cloudy with isolated showers moving along with the moderate trade wind flow.

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MORRISON

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Hawaiian Islands Satellite Interpretation Message

Hawaiian Islands Satellite Interpretation Message
Mon, 18 Oct 2010 00:30:00 -0500

Based on data through 0500 UTC October 18 2010.

High pressure is centered far NE of the islands near 35°N 145°W and extends a ridge toward WSW. The ridge extends from 30°N 150°W across to 25°N 170°W. Low clouds south of the ridge are moving east at 10 to 20 mph, while north of the ridge low clouds are moving NW at 5 to 10 mph. Low clouds are mostly scattered across the tropical and subtropical central Pacific with a few patches of broken clouds mixed in.

An upper level trough stretches from 30°N 150°W to the southwest over 20°N and the dateline. The low is enhancing some low level cloud growth near 28°N 152°W and also near 20°N 170°W where isolated towering cumulus can be seen on IR satellite imagery.

The subtropical jet is producing layered mid and upper level clouds from the dateline to 165°W between latitudes 8°N and 20°N. The jet meanders across the central Pacific between 10 and 20°N and is creating a smaller areas of mid and upper clouds near 17°N 141°W along with isolated thunderstorms with tops reaching 38 thousand feet.

Kauai, Oahu, Molokai and Lanai all have mostly clear skies this evening with the exception of the Koolau mts where partly cloudy skies prevail. Maui and the big islands have mostly cloudy skies with patches of partly cloudy skies near the coasts of Maui, and the leeward upslope areas of the Big Island.

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MORRISON

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Hawaiian Islands Satellite Interpretation Message

Hawaiian Islands Satellite Interpretation Message
Sun, 17 Oct 2010 19:30:00 -0500

Based on data through 0000 UTC October 18 2010.

As of 2 pm, the scattered to broken low clouds that were over the eastern half of Kauai were relegated to the southwestern third. The broken clouds that were only over the Koolau mountains and olomana on Oahu this mornig have been joined by broken clouds over the Waianae mountains. As for Maui county, almost all of the clouds were collected over higher terrain. Elsewhere over the smaller islands, skies were mostly clear.

The Big Island, as is usual for this time of the day, Sat under broken to overcast clouds. The exceptions where there were clear skies were over and near Upolu Point, over the Kau desert, over the summits of Mauna Kea and Mauna Loa, and down the spine of the southwest rift zone.

As was the case this morning, low clouds were broken over waters east of Maui, and broken to overcast east of the Big Island. Overall, there are far fewer clouds out there than at 8 am this morning. As for tops, most of the low clouds were at or below 8000 feet. As for movement, the clouds over water were moving to the west southwest at 10 to 15 mph, while those over land were still anchored to the mountain terrain.

Water vapor imagery showed that there has been little change since this morning. Two upper level lows, one centered west of the state near 21°N 165°W, and one centered north of the state near 28°N 153°W continued to fire off thunderstorms. The low to the west had the most thunderstorms in a large area bounded by 07°N and 23°N between 165°W and 180°W. These clouds were also the tallest, reaching up to near 45000 feet. The low to the north was far punier, with only a few small thunderstorms near its center. An upper level trough extending northeast and southwest of the lows continued to carry patchy high clouds up over the state from the southwest. The cirrus clouds were up near 25000 feet.

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CRAIG

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Hawaiian Islands Satellite Interpretation Message

Hawaiian Islands Satellite Interpretation Message
Sun, 17 Oct 2010 07:30:00 -0500

Based on data through 1200 UTC October 17 2010.

Water vapor imagery shows a couple of upper level troughs over the central Pacific area. One broad upper trough is centered near 22°N 174°W and is drifting west at 15 mph. A smaller scale upper trough is found near 26°N 154°W, or about 450 miles north northeast of Honolulu and is drifting south southwest at 10 mph. An upper level jet is criss-crossing the area to the south of these troughs, running from 15°N 170°W to the main Hawaiian islands and off to the east northeast over 1000 miles.

All of these upper level troughs are helping to organize scattered thunderstorm activity, and the upper jet is spreading scattered layered cirrus from deep tropical convection across the main Hawaiian islands. Infrared imagery shows the greatest concentration of scattered thunderstorms, with tops to 50000 feet, in the area from 22°N to 16°N between 167°W and 177°W. These storms are nearly stationary and embedded in extensive layered mid and high cloud decks. More scattered thunderstorms extend from 14°N to 09°N between 170°W and 177°W. Isolated thunderstorms are located 450 to 600 miles north northeast of Honolulu moving southwest at 10 to 15 mph. Isolated thunderstorms with tops to 38000 feet are also located 350 to 550 miles southeast of the Big Island, with a larger concentration of thunderstorms to 52000 feet located about 900 miles east southeast of Hilo near 16°N 140°W.

Over the main Hawaiian islands, the aforementioned high clouds are obscuring low cloud features over Maui county. Elsewhere, broken low clouds are located over the lower windward and slopes of the Big Island, and extend over the nearby windward coastal waters southward to South Point. Broken low clouds are seen over the windward Kauai coastal waters and across the Kauai channel. Low cloud tops are generally near 9000 to 11000 feet across the islands and are moving to the west southwest at 15 to 20 mph in areas free from terrain.

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BRENCHLEY

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