Hawaiian Islands Satellite Interpretation Message
Tue, 14 Dec 2010 23:30:00 -0600
Based on data through 0500 UTC December 15 2010.
The water vapor loop shows a large upper level ridge centered across the main Hawaiian islands this evening which is resulting in subsidence occuring over the state. West of the ridge is an upper level trough with a center axis from 40°N 173°E to 20°N 179°E. This upper level trough is producing a large area of multilayered clouds 400 to 600 miles wide along an axis from 33°N 176°E to 32°N 172°W to 24°N 170°W to 10°N 176°E. Isolated cumulonimbus clouds with tops to 45 kft are embedded within the cloud band and are found mainly south of 25°N. An area of towering cumulus clouds extends off the main cloud band at the base of the upper trough within a 200 mile radius of 27°N 178°E. Several lightning strikes have been picked up by detection within these clouds.
At the surface, a front is buried beneath the upper level cloud features. A weak surface low is centered near 28°N 173°W as estimated by infrared satellite. The front extends from the low to 22°N 174°W to 17°N 176°E. The only part of the front that is discernible on infrared imagery is south of 21°N where the front lags behind the dense layered cloud band.
A broad line of layered clouds associated with a 150 mph jet streak oriented west to east. The jet has an axis from 32°N 159°W all the way over the western continental united states. Underneath the jet, shortwave energy at the midlevels as well as a weak surface low are providing clouds beneath the jet. While most of this dense cloud cover is located just to the north of 30°N, some of the clouds associated with this system are skirting as far south as 27°N in the central Pacific basin.
Across the main Hawaiian islands this evening, scattered cumulus clouds cover much of the windward coastal waters. The bow cloud offshore of windward Big Island is indicative of the trade winds building back in across the eastern side of the state. The cumulus clouds are traveling to the west-northwest at 15 mph. Over land, area of broken cloud build ups are evident on the last visible imagery today, mostly concentrated over mountain areas. On Kauai, low cumulus cloud build ups are seen across leeward side of the island, while the windward side is mostly clear. The koolaus on Oahu have broken clouds over them and the rest of the island is partly cloudy. Molokai is mostly clear with the exception of some cloud buildups across the far eastern side. Lanai has broken to overcast clouds over most of the interior of the island. Maui has broken clouds over windward west Maui and a few across the western slopes of Haleakala. The rest of the island of Maui is mostly clear this evening. On the Big Island, broken to overcast clouds cover most of the slopes from Apua Point to South Point to Kailua to Upolu Point up to 8 kft in elevation. Scattered clouds also cover the south Hilo and Puna districts. A few cirrus cloud bands are traveling over the western main islands this evening which are coming from the earlier mentioned dense layered cloud band.
Far south of the Hawaiian islands, scattered ITCZ convection is firing mainly east of 160°W and between 05°N and 10°N. Cloud tops extend to around 46 kft in the vertical.
FOSTER
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