Hawaiian Islands Satellite Interpretation Message
Thu, 20 Jan 2011 06:30:00 -0600
Based on data through 1200 UTC January 20 2011.
The cold upper level low that gave the summits on the Big Island and Maui some snow 24 hours ago, is now well south of the Big Island near 16°N 158°W or a distance of 240 miles. It continues to move southwest with its forward speed reduced from 20 mph earlier in the evening to 12 mph now.
There is a broad area of layered clouds and embedded thunderstorms that is attempting to spread north, towards the Big Island. The leading edge to this area is 60 miles southeast of the Kau coast. The main body is located a distance away from the upper low, between 250 and 500 miles to the east. It is 200 miles wide and 700 miles long, stretching from 19°N to 10°N between 150°W and 154°W. Weather radar shows mid layered clouds and precipitation dissipating upon reaching the outer limits of the coastal waters south of South Point.
Another band of clouds and storms is located just to the east and southeast of the upper low. The area is 150 miles wide and 300 miles long, extending from 17°N to 12°N from 157°W to 154°W.
The low level trough has passed the Big Island and is now near Maui. Little weather is associated with the trough where the bulk of the showers are lagging a distance behind of between 70 and 130 miles. It did usher in a small area of scattered showers, currently affecting windward Kohala and the northern portion of the Hamakua coast. The weather radar is not detecting anymore showers to the remaining coastal waters of the Big Island. Surface data shows the surface wind veering from northeast to east and southeast with the passage of the trough.
The weather west of the trough is rather quiet, with fair and dry conditions prevailing. The only fly in the ointment was a few showers having moved onto the windward sections of Oahu north of Kailua 2 hours ago. The showers have since dissipated. The low level winds west of the trough are from the northeast at 15 mph.
Other features on satellite imagery, the band of mainly mid level clouds west through southwest of Kauai is gradually falling apart.
The stalled frontal band 280 miles northwest of Kauai has shown signs of dissipating as well. The position has not changed from earlier in the evening, with the following coordinates of 30°N 159°W to 25°N 164°W to 22°N 170°W to 19°N 176°W. The front meanders further north beyond 40°N and further west beyond the date line.
LAU
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