Hawaiian Islands Satellite Interpretation Message
Fri, 14 Jan 2011 12:30:00 -0600
Based on data through 1800 UTC January 14 2011.
Cloud cover is generally decreasing and stability is slowly increasing over the main Hawaiian islands. Meanwhile, a very strong low is affecting Midway atoll and is dragging a front over laysan island.
An extremely strong, low latitude, and zonal, or west to east flowing, west Pacific jet stream is running along 30°N as far east as 170°W, .then turns to the northeast. This jet stream is supporting a storm force low only 450 miles north of Midway atoll. Scattered to locally broken cumulus clouds are racing across Midway from the west in a prefrontal flow. The associated front lies over laysan island about 275 miles southeast of Midway, or 625 miles northwest of Kauai. The ragged front is marked by a 200 mile-wide band of broken layered clouds from 30°N 165°W to 25°N 173°W, then becomes dominated by low clouds to 21°N 180°. The front is travelling to the east at 35 to 40 mph.
The main Hawaiian islands lie under a southerly low-level flow ahead of the front. A narrow band of prefrontal convergence with tops over 20000 ft is draped over Kauai and the Kauai channel. As a result, the garden isle is covered with broken low clouds. Although Oahu is just east of this feature, moisture remains high with precipitable water values over 1.5 inches, and broken low clouds cover much of the island. Cloud cover diminishes to the east. Patches of broken low clouds are found on the higher terrain of west and east Molokai. The rest of Maui county is mostly clear. On the Big Island, stable stratocumulus clouds moving up from the southeast, producing small areas of broken low clouds over Kau and Puna. Stability is gradually returning as upper level ridging builds over the islands.
Elsewhere, prefrontal convergence north of the main Hawaiian islands is producing isolated thunderstorms which have decreased in coverage this morning. Isolated thunderstorms rise to 35000 ft north of 24°N between 161°W and 152°W.
DWROE
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