Issued: Dec 19, 2014 2:00 AM HST
Based on data through 2:00 am Dec 19 2014 HST
As was the case last evening, low ceilings, some with accompanying showers, have been mainly located in windward and mauka areas on the individual islands. And on the smaller isles and in west Maui, broken low clouds have been moving over leeward sections from time to time as well. Low cloud movement is from the east between 20 and 25 mph across the aloha state this early morning.
Broken to occasionally overcast low cloudiness is prevalent in the waters surrounding Kauai as of bulletin time. Scattered to broken showery low clouds are north clockwise through south of the Big Island, while high clouds are also generating ceilings south of the isle. Skies are otherwise clear to scattered over the adjacent coastal waters.
The axis of a jet stream south of the state is generally oriented west-to-east, and, as a whole, has been pushing steadily north over the past seven hours. Roughly speaking, it is currently along a line from 15°N 170°W to 17°N 160°W to 17°N 150°W to 12°N 140°W. The jet is carrying a swath of broken to overcast high clouds, with some elements being just south of the Big Island, as alluded to in the second paragraph.
Convection is weak and sporadic along the intertropical convergence zone far south of Hawaii. Between 140°W and the date line at 180, most of the showers and isolated thunderstorms have been occurring from 03°N to 08°N.