Hawaiian Islands Satellite Interpretation Message
Sun, 21 Nov 2010 18:30:00 -0600
Based on data through 0000 UTC November 22 2010.
A complex and highly amplified pattern across the north Pacific continues to produce a weak trade wind flow over the main Hawaiian islands.
A west to east flowing jet stream flowing along 30°N in the western north Pacific abruptly turns northward near 170°W as it slams into a strong upper level ridge centered along 150°W. However, a small amount of the energy from the jet stream is undercutting the upper ridge, spilling over the main Hawaiian islands, and dropping into a cutoff upper level low centered about 375 miles northeast of the Big Island near 23°N 150°W.
The upper level low is drifting to the east and is supporting a low level trough along 29°N 152°W, 24°N 151°W, and 18°N 151°W that is drifting to the west. To the east of the trough, a 400 mile wide area of broken to overcast layered clouds is centered along 26°N 149°W, 20°N 146°W, and 14°N 146°W, with isolated, embedded thunderstorms rising to 43 kft.
To the west of the main Hawaiian islands, a front is moving along the eastern end of the zonal jet stream. The front is marked by a 225 mile wide band of broken layered clouds with embedded thunderstorms rising to 44 kft along 30°N 167°W to 26°N 171°W. The front narrows and continues to the west to 23°N 180° as a 100 mile wide band of broken low clouds. The front is travelling to the east near 25 mph. Prefrontal thunderstorm coverage has diminished this afternoon but persists between the front and 163°W north of 24°N, about 300 miles northwest of Kauai.
The systems to the west and east of the main Hawaiian islands are holding surface high pressure far north northeast of the area, resulting in a weak trade wind flow. Few to scattered low clouds near Kauai are traveling from the east around 10 mph, backing out of the northeast across the rest of the state. Under the weak flow, afternoon sea breezes have produced broken to locally overcast low clouds over leeward terrain on all islands. Cloud cover across windward terrain is slightly less extensive, though broken low clouds are found across most areas. Midday, satellite derived, precipitable water estimates over and just upstream of the islands are running between 1 to 1.1 inches, slightly below November norms.
DWROE
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