Hawaiian Islands Satellite Interpretation Message
Sat, 18 Sep 2010 13:30:00 -0500
Based on data through 1800 UTC September 18 2010.
A deep layered ridge is positioned about 520 miles north-northwest of Oahu this morning and is slowly retrograding westward. This movement is allowing for the trailing end of a surface 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 cloud band along the front along an axis from 23°N 149°W to 30°N 136°W up to the oregon coast. The cloud band is characterized by a 200 to 300 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 1.8 to 1.9 inches. Around the Hawaiian islands, soundings show values around 1.1 inches.
A mixture of scattered cumulus with broken patches of stratocumulus clouds are bunched up against the windward and leeward coastal waters and through the channels along the smaller main Hawaiian islands. Embedded scattered showers, mostly light, are moving across Molokai through Niihau this morning according to radar and automated observations. On Kauai, these clouds are pushing into the eastern half of the island while the western half remains mostly sheltered from the clouds and rain. Oahu has several wave cloud bands leeward of the Koolau mountains and most portions of the island have broken ceilings this morning. Molokai has a small bit of clearing over the Molokai airport but the majority of the island is covered with broken low clouds. Lanai has broken clouds over most of the island interior. Maui also has broken clouds on the western portion of the island with a few on the windward slopes of Haleakala. The remainder of Maui is mostly sunny this morning. The Big Island has just a few clouds across Hilo and the south Kona district, but otherwise 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. The cloud band associated with the front runs along an axis from to 40°N 160°W to 30°N 179°W to 25°N 172°E and is around 150 miles wide. Dense layered clouds with tops around 35 kft along the axis south of 30°N.
Scattered thunderstorms within the near equatorial trade wind convergence zone south of the islands, from 06°N to 12°N between 140°W and 180. Cloud tops extend to 52 kft in the vertical in this area.
FOSTER
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