Hawaiian Islands Satellite Interpretation Message

Hawaiian Islands Satellite Interpretation Message
Mon, 13 Dec 2010 23:30:00 -0600

Based on data through 0500 UTC December 14 2010.

The most noticeable cloud feature across the central north Pacific is a ragged 300 to 500 mile wide band of overcast layered clouds north of a line from 35°N 140°W to 30°N 155°W to 20°N 166°W to 14°N 180°W. This band extends farther to the northeast, reaching northern California and the Pacific northwest section of the mainland. Isolated cumulonimbus, CB, are embedded within the leading edge of the main layered cloud band, with the closest CB about 300 miles northwest of Kauai. Breakaway segments of high clouds have pushed southeast of the main cloud band, reaching Kauai and surrounding waters this evening. However, the main cloud band appears to be nearly stationary.

Southeast of the cloud band, low level flow appears to be governed by a surface ridge with an axis extending roughly through 34°N 140°W and 26°N 155°W. This places the main Hawaiian islands at the western periphery of the ridge and light southeast to northwest low cloud motion is noted there.

Low cloud cover is decreasing across the islands as evening cooling sets in. Kauai, Oahu, Lanai and the Big Island all appear to have scattered low clouds to clear skies. Molokai has scattered to broken low clouds across its central third which are sloughing off to the north. Broken to overcast low clouds persist across west and northeast-facing Haleakala slopes on Maui, as well as across the Maui saddle and the mountains of west Maui. Cloud cover across local waters is generally scattered to clear.

Isolated CB are embedded within broken to overcast layered clouds east of 154°W between 06°N and 12°N. Additional isolated CB are noted west of 175°W between 08°N and 13°N.

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POWELL

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Hawaiian Islands Satellite Interpretation Message

Hawaiian Islands Satellite Interpretation Message
Mon, 13 Dec 2010 18:00:00 -0600

Based on data through 2330 UTC December 13 2010.

Convective low clouds from the heating of the day have been forming over the aloha state this early afternoon. Ceilings have been favoring mauka, upslope and interior sections of the individual isles. This has been especially the case over east Maui and the Big Island as of bulletin time. Other areas are sunny to partly cloudy. Low cloud motion is near 15 mph statewide, from the east-southeast just east of the Big Island and veering to the south-southeast moving up the chain to Kauai.

Areas of scattered to broken low clouds are passing by north of the Big Island and Maui county, and to the west of the Big Island. Conditions are clear to scattered elsewhere in the adjacent coastal waters.

The leading edge of showers and thunderstorms ahead of a front is about 400 miles west-northwest of Kauai, and has been heading east near 10 mph over the past six hours. Most of the convection is currently within 90 miles either side of a line from 30°N 161°W to 21°N 168°W to 18°N 176°W to 16°N 180°.

Showers and thunderstorms remain fairly weak and widely separated along the intertropical convergence zone far south of Hawaii. Most of the activity is located from 06.5°N to 10°N between 136°W and 155°W, and from 07°N to 10°N west of 175°W.

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KINEL

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Hawaiian Islands Satellite Interpretation Message

Hawaiian Islands Satellite Interpretation Message
Mon, 13 Dec 2010 12:00:00 -0600

Based on data through 1730 UTC December 13 2010.

Low ceilings, some with embedded showers, are prevalent in coastal and upslope areas of the Kau, Puna, and Hilo districts on the Big Island this morning, and to a lesser extent Hamakua. Broken low cloudiness has also been affecting, at least from time to time, upslope sections of east Maui, and mauka portions of west Maui, Molokai and Lanai. Skies are otherwise clear to partly cloudy. Low cloud movement is near 15 mph across the aloha state, from the east-southeast near the Big Island and veering to south- southeast moving up the chain to Kauai.

A band of broken showery low cloudiness, with embedded towering cumulus clouds, stretches northeastward from the Big Island and is heading northwest with the prevailing low-level flow. The band then extends just east of the isle and continues off to the south. Smaller areas of scattered to broken low clouds exist west of Kau and south Kona on the Big Island, north of Maui county, south clockwise through west of Oahu, and north of Kauai. Conditions are clear to scattered elsewhere in the adjacent coastal waters.

A line of showers and thunderstorms ahead of a front is west of the islands and has been pushing east near 15 mph over the past six hours. The leading edge of the convection is approximately 450 miles west-northwest of Kauai as of bulletin time, with most of the activity currently within 90 miles either side of a line from 30°N 163°W to 21°N 170°W to 17°N 180°.

Showers and thunderstorms are firing along the intertropical convergence zone far south of Hawaii, though most of the cells are weak and widely separated. The convection is mainly found from 06.5°N to 10°N between 136°W and 165°W, and from 06.5°N to 09.5°N west of 174°W.

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KINEL

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Hawaiian Islands Satellite Interpretation Message

Hawaiian Islands Satellite Interpretation Message
Sun, 12 Dec 2010 23:30:00 -0600

Based on data through 0500 UTC December 13 2010.

A still discernible frontal band extended through 30°N 140°W to 26°N 152°W. A low level convergence zone was lying immediately southeast of the frontal band and extended from 30°N 140°W to 24°N 150°W. Broken to overcast low to mid level clouds along these two features were common within the area bounded by points 23°N 150°W, 27°N 150°W, 30°N 143°W and 30°N 138°W.

Remnant clouds from the tail end of the old front continued as scattered to broken low clouds from 26°N 152°W to 23 160°W. A more substantial amount of mostly broken low clouds associated with the convergence zone east of the state was spreading out toward the islands. These low clouds were common within a triangular region bounded by the Big Island, 24°N 150°W and 15°N 154°W.

Some clouds from this area immediately east of the Big Island were sliding toward the northwest and just skirting the windward or east sides of the island chain. Also, a handful of small, short-lived type of towering cumulus and/or thunderstorms were noted within this cloud area from 21°N 151°W to 19°N 152.5°W. Tops of these unstable cloud features were between 25000 and 27000 feet. Elsewhere, cloud tops near the islands were generally in the 10000 to 13000 feet range.

A weak upper low in the vicinity of 16°N 150°W was moving slowly east. This upper low was generating a swath of layered clouds including cirrus generally between 15°N and 20°N from 140°W to 150°W.

Another large frontal system northwest of the state was inching its way toward us. The front currently extended through 30°N 172°W and 23°N 180°E. The associated cloud band was about 300 miles wide. Broken low clouds ahead of the front in the area between 162°W and 170°W, north of 23°N, were flowing northward in towards the approaching front.

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Hawaiian Islands Satellite Interpretation Message

Hawaiian Islands Satellite Interpretation Message
Sun, 12 Dec 2010 12:30:00 -0600

Based on data through 1800 UTC December 12 2010.

Two major cloud features are immediately noticeable within the central north Pacific basin this morning. The first feature is an area of overcast layered clouds east of a line from 33°N 140°W to 20°N 151°W to 10°N 156°W. The second feature is also an area of overcast layered clouds, but north of a line from 21°N 180°W to 33°N 160°W, and south of a line from 33°N 160°W to 42°N 180°W. Both features mark frontal boundaries east and west of the main Hawaiian islands, respectively.

Smaller cloud features include a ragged 90 to 120 mile wide band of overcast layered clouds with embedded isolated cumulonimbus, CB, north of a line from 18°N 166°W to 13°N 180°W. The intertropical convergence zone is marked by a 120 mile wide band of isolated CB north of a line from 07°N 157°W to 05°N 140°W. This band thins a bit and loses the CB north of a line from 07°N 157°W to 04°N 170°W to 04°N 180°W.

First visible imagery shows broken low cloud cover across windward Hawaiian waters west of Maui. Scattered to broken low clouds also lie east of the Big Island. Kauai has broken low clouds across its eastern half, while Oahu has broken low clouds only across the Koolau summits. Scattered to broken low clouds lie across the eastern tip of Molokai, but Lanai and Maui appear to be free of low clouds. Scattered to broken low clouds dot skies across Puna district of the Big Island, leaving the rest of that island beneath clear skies. Snowcaps on the Mauna Loa and Mauna Kea summits are clearly visible.

Satellite loop shows low clouds moving across Hawaiian waters generally toward the west at 10 to 15 mph. There is a bit of veering from east to west across the islands.

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POWELL

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Hawaiian Islands Satellite Interpretation Message

Hawaiian Islands Satellite Interpretation Message
Sat, 11 Dec 2010 23:30:00 -0600

Based on data through 0500 UTC December 12 2010.

A large frontal cloud band lingered east of the state this Saturday evening. The east edge of the 300 to 400 miles wide cloud band extended through 30°N 140°W to 14°N 146°W. This band consisted of broken to overcast multi-layered clouds. Isolated thunderstorms were embedded within the band, mostly south of 20 north latitude.

The actual front itself extended roughly through 30°N 142°W to near 24°N 150°W. Much of the cloudiness south of the front was associated with low level convergence and the presence of an upper level trough aloft. Water vapor imagery showed the upper trough axis extending through 30°N 150°W to 20°N 153°W to 14°N 158°W. The upper trough was moving east at just over 25 miles an hour along 30°N and near 15 miles an hour at the south end.

Another front far west-northwest of the state extended from northeast to southwest through 30°N 178°W. However, a large mass of broken to overcast cirrus clouds were spewing eastward ahead of the front. The cirrus was mainly north of a line from 30°N 160°W to 25°N 180°E. But a few small strands and fragments were observed out ahead of the main mass within only 140 miles northwest of Kauai.

Near islands, scattered to broken low clouds were noted mainly north of a line from 22°N 154°W to the north coast of Kauai to 24°N 170°W. A small smattering of scattered to broken low cloud patches were observed over the islands and adjacent waters. The low clouds near the islands were moving south-southwest near 10 miles an hour.

Far south of the state, isolated ITCZ thunderstorms and multi-layered clouds occupied the area between 07°N and 10°N from 145°W to 164°W.

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Hawaiian Islands Satellite Interpretation Message

Hawaiian Islands Satellite Interpretation Message
Sat, 11 Dec 2010 18:30:00 -0600

Based on data through 0000 UTC December 12 2010.

Water vapor shows an upper level trough passing north of the main Hawaiian islands this morning and has an axis which extends from 35°N 155°W to 24°N 152°W. Deep layered clouds associated with this feature cover a large area from 11°N to 40°N and 144°W to 154°W. Tops range from 35 to 45 kft in height across most of this cloud region.

Cloud cover over the main Hawaiian islands has generally decreased over the past six hours due to the departing layered cloud band and the front across Maui county dissipating. Typical sea breeze cloud build ups are observed on visible satellite over most of the island interiors. Scattered cumulus clouds are observed across Kauai and Oahu this afternoon with mountains and central interiors being the prime area. Molokai has broken clouds over the whole island with a few showers on radar over the mountainous areas along the north coast. Lanai has broken clouds over most of the island interior. Maui has cloud build ups over most of the island as well, with some break ups in the central valley. Most of the Haleakala summit is obscured from the low cloud cover as well. The Big Island has overcast cumulus clouds over northeast and southeast lower slopes up to 10 kft in elevation. Broken cumulus clouds cover the leeward coast up to 7 kft in elevation. Few to scattered cumulus cover windward waters this afternoon while faint plume clouds are observed over leeward waters.

Far northwest of the state, another upper level system is centered west of the dateline. Dense layered clouds cover an area on the southern and eastern flanks of the low. Most of the cloud cover is north of 26°N and west of 168°W.

Far south of the state, isolated ITCZ thunderstorms are firing between 08°N to 10°N and 142°W to 162°W.

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FOSTER

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