Monday, September 6, 2010
Hawaiian Islands Satellite Interpretation Message
Hawaiian Islands Satellite Interpretation Message
Mon, 06 Sep 2010 13:30:00 -0500
Based on data through 1800 UTC September 06 2010.
Water vapor shows three upper level low pressure systems in the central Pacific this morning. The eastern most upper level low is about 730 miles north northeast of Honolulu this morning near 30.8°N 152.8°W. The next low to the west is about 985 miles north northwest of Honolulu near 30.5°N 170.1°W. The western most upper low is about 1450 miles west of Honolulu near 21.9°N 179.5°E. All three systems are moving towards the west around 15 miles an hour.
Low clouds near the islands are moving in from the east around 20 miles an hour.
Scattered cumulus clouds are found over the east sides of the smaller islands this morning. On Kauai, scattered clouds are found over the eastern half of the island. Meanwhile a batch of low clouds is passing over Niihau. On Oahu, the clouds are concentrated over the Koolau mountain range, and over Molokai the clouds are found over Halawa Valley. A couple of clouds are noted over the east facing slopes of Lanai, while skies are clear over Kahoolawe. On Maui, clouds are beginning to form over the east facing slopes of the west Maui mountains, and over the east facing slopes of Haleakala from huelo to Hana to Kipahulu.
Low clouds are found over various portions of the Big Island this morning. A batch of low clouds is found over the east facing slopes of the Kohala mountains, with another area found over the lower slopes of the north Hilo, south Hilo and Pahoa districts. Clouds are also beginning to form over the lower slopes of the Kau district. Low clouds are also found over the south Kona district, and extend northward into the north Kona district.
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Hawaiian Islands Satellite Interpretation Message
Hawaiian Islands Satellite Interpretation Message
Mon, 06 Sep 2010 07:30:00 -0500
Based on data through 1200 UTC September 06 2010.
Patches of scattered to broken cumulus clouds had increased in number overnight around the Hawaiian islands. These low clouds were common from 17°N to 30°N between 150°W and the dateline. Further east, the low clouds became more numerous and more stable. Trade winds were carrying the clouds near the islands west around 15 miles an hour.
An upper level low near 31°N 169°W was moving west near 15 miles an hour. A few isolated thunderstorms were forming near its center. And a few wispy strands of cirrus encircled this upper low. Another upper low near 23°N 179.5°E had just drifted west across the international dateline.
Southeast of the two upper lows, the upper wind flow from the southwest was carrying a few patches of mostly scattered cirrus clouds toward Kauai. These high clouds were located mainly from 17°N to 23°N between 170°W and 160°W.
Yet another upper low was north of the state in the vicinity of 32°N 151°W. This low was moving southwest at 10 to 15 miles an hour. Its associated trough axis extended from the low to 26°N 154°W.
Southeast of the state, a nearly stationary surface trough Sat from roughly 10°N 150°W to 13°N 140°W within a northward extension of the ITCZ. Isolated thunderstorms were embedded within 100 miles either side of the ITCZ, centered along a line from 08°N 180°E to 06°N 155°W to 13°N 140°W. East of 140°W, the ITCZ turned back toward the southeast. The largest concentration of thunderstorms was along the trough. Highest storm tops were around 47000 feet.
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Sunday, September 5, 2010
Hawaiian Islands Satellite Interpretation Message
Hawaiian Islands Satellite Interpretation Message
Mon, 06 Sep 2010 00:30:00 -0500
Based on data through 0500 UTC September 06 2010.
Light to moderate trade winds were carrying a few patches and small clusters of scattered to broken low clouds into the Hawaiian islands. These low based clouds were moving toward the west or slightly toward the west-southwest around 15 miles an hour. At 7 pm, most of the clouds were seen around the Big Island and along the windward sections of Maui.
An upper level low near 31°N 167°W was moving west at 10 to 15 miles an hour. A few wisps and strands of cirrus encircled this upper low. Another upper low near 23°N 178°W was nearly stationary. An upper trough extended down through 30°N 153°W to 27°N 156°W. The trough was drifting very slowly south while swinging southeastward.
Also in the upper levels of the atmosphere, a protrusion of scattered to broken cirrus clouds was headed toward Kauai from the southwest. The 275 miles wide finger of high clouds was centered from 17°N 174°W to 21°N 164°W. The high clouds were still about 275 miles from the garden isle.
Southeast of the state, a nearly stationary surface trough Sat from roughly 10°N 150°W to 13°N 140°W within the ITCZ. Isolated thunderstorms were embedded within 100 miles either side of the trough. Highest storm tops were near 47000 feet.
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Hawaiian Islands Satellite Interpretation Message
Hawaiian Islands Satellite Interpretation Message
Sun, 05 Sep 2010 19:30:00 -0500
Based on data through 0000 UTC September 06 2010.
Broad high pressure centered far north northeast of the area is generating a vast field of scattered to locally broken stratocumulus and shower-bearing cumulus clouds in the trade wind flow extending from the main Hawaiian islands east to 140°W and north beyond 30°N. Near the islands, individual low clouds are travelling from the east northeast at 15 to 19 mph, essentially unchanged from this morning but a slight decrease in speed since yesterday afternoon.
Low cloud coverage over the islands is following a rather typical trade-wind pattern this afternoon. Cloud coverage is slightly greater over waters just east of the Big Island and Maui compared to the rest of the state, though windward portions of all islands are covered with broken low clouds. Afternoon sea breezes have led to the development of broken to overcast low clouds over all leeward slopes of the Big Island as well as windward Kau. Sea breezes on the smaller islands have produced patches of broken low clouds along leeward terrain.
Stable conditions prevail over the main Hawaiian islands. However, deepening upper level troughing several hundred miles north of the state is leading to a slow decrease in the degree of subsidence over the islands inferred from water vapor imagery. The upper trough runs along three upper lows centered near 24°N 178°W, 30°N 166°W, and north of the area near 33°N 149°W. Narrow streaks of broken high clouds are found along the flanks of the upper low near 30°N, while the upper low near 24°N is generating a small shield of broken high clouds 500 miles west of Kauai.
To the southeast of the state, a nearly stationary surface trough is embedded within the ITCZ along 13°N 140°W and 10°N 149°W. Isolated thunderstorms rise as high as 49 kft within 100 miles of the trough.
DWROE
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Hawaiian Islands Satellite Interpretation Message
Hawaiian Islands Satellite Interpretation Message
Sun, 05 Sep 2010 13:30:00 -0500
Based on data through 1800 UTC September 05 2010.
Broad high pressure centered far north northeast of the area is generating a vast field of scattered to locally broken stratocumulus clouds and shower-bearing cumulus clouds in the trade wind flow extending from the main Hawaiian islands east to 140°W and north beyond 30°N. Near the islands, individual low clouds are travelling from the east northeast at 15 to 18 mph, a slight decrease in speed since yesterday.
Low cloud coverage over the islands is following a rather typical trade-wind pattern this morning. Patches of broken low clouds are banked up along windward terrain of all islands. Few to scattered low clouds are noted across most leeward sections, though small patches of broken low clouds are observed over the Waianae coast on Oahu and the kekaha vicinity on Kauai.
Subsidence aloft seen in water vapor imagery is producing stable conditions over the main Hawaiian islands, while deepening upper level troughing is found several hundred miles to the north. The upper trough runs along three upper lows centered near 24°N 178°W, 30°N 165°W, and north of the area near 34°N 146°W. Narrow streaks of broken high clouds are found along the flanks of the upper lows near 30°N and 24°N.
To the southeast of the state, a nearly west to east oriented surface trough embedded within the ITCZ is producing a persistent area of thunderstorms north of 10°N. Isolated thunderstorms rise as high as 50 kft south of 14°N east of 150°W.
DWROE
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