Issued: Apr 18, 2014 7:30 PM HST

Based on data through 7:00 pm Apr 18 2014 HST

Water vapor imagery shows an upper level low centered at 16°N 166°W moving to the west very slowly. Infrared satellite shows an overcast mix of layered and cirrus clouds along the eastern flank of the low. Southerly winds in this areas are drawing moisture north from the near-equatorial trade wind convergence zones /netwcz/. The cloud area covers from 10°N to the main Hawaiian islands, generally bounded east to west by 153°W and 164°W.

Streaks of broken cirrus were also noted far northwest of the state within an area bounded between 30°N 153°W to 21°N 168°W to 23°N 173°W to 30°N 164°W. These high clouds are traveling east at 25 mph.

Trade winds are moving broken stratocumulus clouds to the west at 25 mph. These clouds are bounded between 10°N and 26°N, and are bushing over and to the south of the main Hawaiian islands. Radar indicates these clouds are producing scattered showers over windward and mauka areas of the islands, with occasional passing showers onto leeward sides of the smaller islands. The stratocumulus cloud area shrinks to a 175 mile wide band which goes from the main Hawaiian islands to 17°N 180°E.

While much of the main Hawaiian island chain is obscured by the higher clouds, last visible images show broken to overcast clouds over the windward and mauka areas, with scattered to few low clouds across the leeward sides of the islands.

The netwcz is characterized by a band of scattered thunderstorms along an axis from 02°N 141°W to 08°N 163°W to 04°N 180°E. The netwcz is around 400 to 600 miles wide. Highest cloud tops in this area are up to 46 kft in height.

Hawaii Infrared Satellite image for 0500 UTC

Central Pacific Infrared Satellite image for 0500 UTC