Hawaiian Islands Satellite Interpretation Message
Mon, 24 Jan 2011 06:30:00 -0600
Based on data through 1200 UTC January 24 2011.
Water vapor imagery across the central Pacific shows an upper level trough with an axis from 20°N 145°W to 11°N 156°W digging towards the southwest. The upper trough in combination with the intertropical convergence zone /itcz/ is igniting an area of showers and thunderstorms from 08°N to 12°N and 132°W to 139°W with tops to 36 kft in height. The showers and thunderstorms are embedded within a band of mid and high level clouds. The area of clouds is bounded south of a line from 07°N 159°W to 22°N 137°W to 22°N 127°W and north of 07°N. The rest of the ITCZ is inactive outside of some scattered low cloud cover.
A dissipating front is 415 miles north-northwest of Kauai and has been drifting toward the north since yesterday. A 150 to 200 mile wide band of remnant low stratus clouds with this system are northwest of a line from 32°N 155°W to 25°N 167°W to 21°N 179°W. Another front is located 250 miles northwest of the dissipating front and runs along a line from 36°N 155°W to 25°N 176°E. A 75 mile wide overcast stratus cloud band is associated with this front and is traveling east at 20 mph. North of 35°N, the front is characterized as a band of dense layered clouds.
To the east of the front, the rest of the central Pacific is dominated by surface high centered around 36°N 139°W which is driving moderate to fresh easterly winds. The winds are carrying patches of broken cumulus and stratocumulus clouds which reach and extend as far as 650 miles southwest of the main Hawaiian island chain. The clouds are a bit thicker upstream to the northeast particularly west of 150°W.
Observations and shortwave IR satellite indicate cloud build ups over the main Hawaiian islands, mostly for windward and mauka areas this morning. Leeward sides of the islands appear to have a bit more breaks across them. Radar is tracking widely scattered showers over windward and southeast Big Island waters with of this shower activity moving onshore. The rest of the state has isolated light shower coverage.
FOSTER
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