Hawaiian Islands Satellite Interpretation Message

Hawaiian Islands Satellite Interpretation Message
Mon, 06 Dec 2010 23:30:00 -0600

Based on data through 0500 UTC December 07 2010.

Water vapor imagery shows an upper level low near 43.8°N 147.8°W, about 1630 miles north northeast of Oahu at 7 pm. The low has been moving towards the southeast around 15 mph over the last six hours. Water vapor also shows an upper level ridge over the main Hawaiian islands, which has been weakening over the last several hours. Another upper level low is near 37.1°N 171.4°E, more than 2100 miles northwest of Oahu at 7 pm. The associated upper level trough axis extend from the upper low to 30°N 175°W.

The system to the west of the islands has had thunderstorms associated with it in two main areas. The eastern most area of thunderstorms has been along a line from 22.7°N 167.7°W to 31.5°N 163.8°W. The second area has been along a line from 22.8°N 174.4°W to 31.1°N 169.5°W.

The leading edge of a low cloud band north of the islands which is associated with both upper level systems mentioned above is about 315 miles north of Oahu at 7 pm.

Due to the upper level ridge over the islands, relatively dry conditions exist over the main Hawaiian islands. Just a few clouds are noted upstream of the islands. The clouds upstream of the Big Island are moving in from the east around 15 mph, while clouds near Kauai are moving in from the southeast around 15 mph.

Scattered clouds are over Niihau and Kauai at 7 pm. On Oahu, scattered to broken low clouds are concentrated over the northern half of Oahu. Maui county has the fewest clouds overhead this evening, with just few clouds over Halawa Valley on Molokai, over the interior of Lanai, and over the slopes of Haleakala. Clouds are plentiful over the Big Island, with clouds covering most of the slopes up to around 10000 feet.

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Hawaiian Islands Satellite Interpretation Message

Hawaiian Islands Satellite Interpretation Message
Mon, 06 Dec 2010 18:30:00 -0600

Based on data through 0000 UTC December 07 2010.

Water vapor imagery shows an upper level ridge positioned across the main Hawaiian islands and stretching off to the east to 20°N 140°W. An upper level trough is tilting into the northwest corner of the area from 26°N 170°W to 30°N 178°W. This trough is rotating northeast around the large scale trough positioned further to the northwest. The upper level subtropical jet remains over the southern portion of the area south of 13°N.

Moisture is being pulled northward from the tropics between the upper trough and the upper ridge over the main Hawaiian islands. Elsewhere, the mid and upper levels are dry.

The most significant cloud features are over the western and northern fringes of the area. A large area of layered clouds with scattered embedded thunderstorms with tops to 45000 feet is located north of 20°N between 166°W and 175°W. These deep layered clouds are covering the northwest Hawaiian islands between French Frigate Shoals and 40 miles southeast of pearl and hermes atoll. Another weaker cloud band with isolated thunderstorms up to 35000 feet, is located to the southwest near 18°N 175°W and continues south southwest to the intertropical convergence zone near 10°N 179°W. A frontal cloud band consisting of mainly low topped clouds is draped north of a line from 30°N 140°W to 26°N 150°W to 28°N 165°W, which then intersects with the large area of clouds previously mentioned.

Over the main Hawaiian islands, mainly clear skies are found over the coastal waters with low clouds developing over interior portions of each island, consistent with a light wind pattern across the state. The largest area of low clouds is on the lower slopes of the Big Island below 8000 feet completely encircling the island. Another less extensive low cloud deck covers the north shore and central Oahu and the northern half of Kauai, extending locally to the north Kauai coast. The few low cloud features over open waters are drifting to the northwest at less than 10 mph.

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BRENCHLEY

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Hawaiian Islands Satellite Interpretation Message

Hawaiian Islands Satellite Interpretation Message
Mon, 06 Dec 2010 06:30:00 -0600

Based on data through 1200 UTC December 06 2010.

Water vapor imagery shows an upper level low about 1780 miles north northeast of Oahu at 2 am, near 46.5°N 149.6°W. Water vapor imagery also shows another upper level low near 33.9°N 169.3°E, more than 2100 miles northwest of Oahu. The leading edge of a low cloud band associated with a surface front with the system to the north northeast of the islands is about 400 miles north of Oahu at 2 am. This low cloud band continues to the west, merging with the clouds associated with the system near the dateline.

Thunderstorms have been noted in association with the system near the dateline. Isolated thunderstorms are noted along a line from 14.8°N 177.5°W to 30.0°N 169.8°W. Thunderstorms are a bit more concentrated north of 30°N, extending to the west closer to the upper level low center.

A few thin high clouds are seen on infrared satellite traveling to the southeast near the main Hawaiian islands. Few low clouds are observed in the vicinity of the main Hawaiian islands. Low clouds south of the Big Island are moving from the east around 15 mph, while clouds north of Kauai are moving from the east southeast.

Isolated thunderstorms are observed in the ITCZ south of the islands. One line of thunderstorms is from 8.1°N 146.5°W to 8.4°N 159.1°W. Another area is centered near 9.1°N 140.0°W. Thunderstorm activity is more concentrated near 10.1°N 131.5°W, along an upper level trough in that area.

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Hawaiian Islands Satellite Interpretation Message

Hawaiian Islands Satellite Interpretation Message
Sun, 05 Dec 2010 23:30:00 -0600

Based on data through 0500 UTC December 06 2010.

Water vapor imagery shows an upper level low about 1825 miles north northeast of Honolulu at 7 pm. This upper level low is near 46.8°N 148.9°W. The associated upper level trough is extends from the low to a point near 27°N 142°W, more than 1000 miles east northeast of Honolulu.

The surface reflection oft he upper level low is near 47.5°N 147.3°W, nearly 1900 miles north northeast of Honolulu. The leading edge of a low cloud band associated with the front is about 490 miles north of Oahu at 7 pm.

A weakening upper level low near 33.4°N 175.1°E, about 1840 miles west northwest of Honolulu. A stationary front associated with this system lies near the dateline, and thunderstorms continue to be found out ahead of the front. Isolated thunderstorms are found along a line from 13°N 180 to 30°N 172°W.

The last visible images of the day show few clouds over the smaller islands, and a few thin high clouds over the general area of the main Hawaiian islands. Low clouds to the east of the Big Island are moving from the east between 15 and 20 mph. North of Kauai, the low clouds are moving from an east southeast direction between 15 and 20 mph.

On Kauai, scattered clouds are found over the eastern third of the island, with additional clouds found over the western third of the garden isle. On Oahu, the low clouds are over the Waianae range. Molokai has clouds over Halawa Valley, and Lanai has clouds over the west side of the island. Just a few clouds are over the slopes of Maui.

The Big Island has the most clouds overhead of all the main Hawaiian islands. The low clouds are thickest over the western side of the island, with clouds blanketing the south Kona, north Kona, and south Kohala districts. These clouds extend up the slopes to around 10 thousand feet. The Kau district also has plenty of clouds overhead at 7 pm. The remaining districts of the Big Island have scattered clouds overhead.

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Hawaiian Islands Satellite Interpretation Message

Hawaiian Islands Satellite Interpretation Message
Sun, 05 Dec 2010 18:30:00 -0600

Based on data through 0000 UTC December 06 2010.

Water vapor imagery shows an upper level ridge across the central Pacific region between 170°W and 155°W south of 25°N. A sharp upper level trough is located just west of the dateline, spreading copious high level moisture northward between the dateline and 170°W. Another upper trough is skirting just north of the area near 35°N 145°W. The subtropical upper level jet is located south of 15°N traversing between 160°W and 140°W.

Widespread layered mid and high clouds covers the area west of 170°W north of 21°N. This area of clouds is the result of two merging cloud bands that stretch further to the south. One band is within 60 miles of a line from 21°N 178°W to 17°N 180°, the other is a band within 40 miles of a line from 21°N 172°W to Johnston island. The clouds within the bands are mostly low topped with isolated towering cumulus to 25000 feet. Within the large mid and high layered cloud area north of 21°N, isolated embedded thunderstorms with tops to 45000 feet are found. These thunderstorms are closely aligned along a north south line along 175°W. Elsewhere, the central Pacific is covered by an assortment of scattered to broken low topped stratocumulus decks, none of these broken cloud decks are more than 100 miles wide.

Over the main Hawaiian islands, broken low clouds are found over the lower slopes of the Big Island below 9000 feet from Waimea south to Kailua Kona to ocean view estates and east to the slopes above Pahala and within 5 miles south of the saddle road on the Hilo side. Broken low clouds are also covering much of the Puna district. The clouds extend locally over the coastal waters up to 10 miles. Few to scattered low clouds exist elsewhere over the smaller islands and coastal waters. Low cloud tops range between 6000 and 8000 feet, except locally to 10000 feet over the Big Island. Individual cloud elements are moving to the west northwest at 10 to 15 mph.

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BRENCHLEY

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Hawaiian Islands Satellite Interpretation Message

Hawaiian Islands Satellite Interpretation Message
Sun, 05 Dec 2010 12:30:00 -0600

Based on data through 1800 UTC December 05 2010.

Water vapor imagery shows an upper level ridge across the central Pacific region between 170°W and 155°W. A sharp upper level trough is located just west of the dateline, spreading copious high level moisture northward between the dateline and 170°W. The subtropical upper level jet is located south of 15°N traversing between 160°W and 140°W.

Widespread layered mid and high clouds covers the area west of 170°W. This area of clouds is most dense and nearly continuous stretching north of 22°N across the far northwest Hawaiian islands west of maro reef. Within this area of layered clouds, .isolated embedded thunderstorms with tops to 45000 feet are found. These are mostly concentrated within 120 miles of the dateline north of 15°N. Elsewhere, the central Pacific is covered by an assortment of scattered to broken low topped stratocumulus decks, none of these more than 100 miles wide.

Over the main Hawaiian islands, skies are mainly clear, with scattered low clouds over the windward half of Kauai, and along the windward coasts of Molokai, Maui and the windward north Kohala coast of the Big Island. A small patch of low clouds covers the south Kona coast between South Point and Honaunau and extending over the nearby coastal waters within 30 miles. Cloud tops are ranging between 6000 and 8000 feet, except locally to 10000 feet over the coastal waters. Individual cloud elements are moving to the west northwest at 15 mph.

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BRENCHLEY

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Hawaiian Islands Satellite Interpretation Message

Hawaiian Islands Satellite Interpretation Message
Sat, 04 Dec 2010 23:30:00 -0600

Based on data through 0500 UTC December 05 2010.

Water vapor imagery was showing an upper level low far northeast of the state near 33°N 135°W. An upper trough extended from the low to just east of the Big Island to near 17°N 158°W. The southwest end of the trough near the state was moving southeast near 15 miles an hour. The upper low was moving more slowly southeastward.

An upper ridge extended roughly from 18°N 165°W to 30°N 171°W. With this ridge just to our west and the upper trough axis east of the state, the air mass around the islands tended to be on the dry and stable side.

An upper trough just beyond the dateline extended from from 19°N 177°E to 30°N 173°E. This upper trough was producing unstable weather in the way of isolated thunderstorms from 16°N to 29°N between 173°W and 176°E. The trough has been nearly stationary over the past 24 hours.

A weakening surface high pressure area just north-northeast of the state this evening was guiding tightly bunched patches of mostly scattered low clouds into the state. These low clouds were moving west near 25 miles an hour. At 7 pm, most of these low clouds in the area were affecting the windward side of the Big Island and east Maui. To a lesser extent, the low clouds were finding their way onto mainly the east and north sides of the other islands. Few clouds were noted on the downwind side of the state except for a few narrow low cloud plumes that form lee of the mountains.

The upper level west to east winds between the Big Island and the ITCZ around 09°N were carrying strands of broken cirrus clouds eastward mainly from 10°N to 16°N east of 170°W. An insignificant amount of scattered to broken wisps of cirrus were noted immediately southwest and south of the Big Island.

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