Last Updated on Friday, 06 December 2013 13:26
Issued: Dec 06, 2013 7:30 PM HST
A nearly stationary frontal boundary lies over the west part of Kauai this evening. The boundary will be lifting northward later tonight in response to a rapidly eastward moving low pressure area currently in the vicinity of 35°N 176°E. The coordinates of the boundary are, 30°N 147°W 25°N 155°W 22°N 160°W 19°N 173°W 21°N 179°W, thence warm front to 30°N 177°W. The warm front meets up with a cold front at 30°N 177°W. The cold extended southwestward to 28°N 180°W and points beyond the date line. The warm front lies close to Midway atoll who is socked in with low ceiling and visibility in rain, and strong and gusty winds with sustained speed of 21 mph and gusts to 33 mph this past hour. Satellite imagery shows a large mass of clouds and weather over the northwest corner of the satellite imagery, roughly west of 170°W north of 20°N. The boundary is hooked up to an intense surface low at 45°N 157°W.
Back to the main Hawaiian islands, a band of broken low clouds lies adjacent to the west of the frontal boundary with a width of up to 150 miles. Satellite imagery shows pockets and areas of cirrus moving from west to east with one patch about to move through the main Hawaiian islands.
Low level winds over Kauai are from the northeast, veering to east across Oahu and Molokai. There is a hint of a slight south component over the windward waters of Maui and the Hamakua coast. Wind speeds are clocked at around 15 mph.
Cloud wise, Kauai and Niihau is under the influence of the boundary with clouds and passing showers. Oahu is under broken low clouds with a few passing showers. These showers tend to dissipated once crossing the Koolau range. Skies are fair across Maui county but there are a few showers lurking around including the adjacent waters.
Maui and Lanai are at the northern fringe of a large mass of layered and high clouds that extended across the Big Island. This cloud mass is 700 miles wide with the mid points being 350 miles either side of a line from 20°N 140°W to 11°N 161°W. The cirrus at the northern fringe to this cloud mass, mark the location of an upper level trough which has slowly edge northwestward during the past 18 hours.
A couple of isolated thunderstorms are confined to an area 100 miles either side of a line between 11°N 150°W and 08°N 160°W.