Hawaiian Islands Satellite Interpretation Message
Sat, 18 Sep 2010 19:30:00 -0500
Based on data through 0000 UTC September 19 2010.
A deep layered ridge is positioned about 650 miles northwest of Oahu this morning and is slowly retrograding westward. This movement is allowing for the trailing end of a weakening cold front and associated upper trough to dig south and southeast over the waters to the northeast of the main Hawaiian islands.
Visible and IR satellite show the cloud band along the front on an axis from 22°N 152°W to 30°N 133°W up to the northern California coast. The cloud band is characterized by a 150 mile wide band of stratus clouds overcast east of 140°W and broken to scattered in coverage east of 140°W. Satellite AMSU and SSMI blended precipitable water values over the location of this cloud band is around 1.6 to 1.8 inches. Around the Hawaiian islands, soundings show values around 1.1 to 1.2 inches.
Across the state this afternoon, a few cumulus clouds are observed over the coastal waters. Thicker plume clouds are also seen leeward of most of the islands. Radar is tracking isolated showers concentrated over Kauai, Niihau and windward Oahu. On Kauai, scattered to broken cumulus cloud buildups are occurring on Kauai and Oahu with the heavier concentrations over the mauka areas. Molokai has a few clouds over the northeast part of the island with the remainder of the area mostly sunny. Lanai has a few clouds over the southern portion of the island. Maui has a few clouds over windward west Maui and the leeward part of Haleakala. The Big Island has overcast clouds over the Kona coast and Kau district up to 8 kft in elevation. Scattered cumulus clouds also cover the windward coast, otherwise the rest of the Big Island is mostly sunny.
Elsewhere in the central Pacific, a stationary front and upper level trough are positioned on the northwest flank of the earlier mentioned high pressure system northwest of the main Hawaiian islands. The cloud band associated with the front runs along an axis from to 40°N 156°W to 30°N 178°W to 25°N 172°E and is around 150 miles wide. The clouds have decreased along this front over the last six hours, but a few embedded towering cumulus clouds are still present mainly west of the dateline.
Scattered thunderstorms within the near equatorial trade wind convergence zone south of the islands, from 06°N to 11°N between 140°W and 170°W. Cloud tops extend to 52 kft in the vertical in this area.
FOSTER
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