Area Forecast Discussion
Issued by NWS Honolulu, HI
FXHW60 PHFO 270725 CCA
Area Forecast Discussion...corrected
National Weather Service Honolulu HI
830 PM HST MON SEP 26 2016
A surface high far north of the state will move further north
through mid-week, then drop southeast toward the weekend. This will
bring a slight decrease in trade winds across the area by mid-week,
but winds will strengthen again toward the weekend.
Although much of the low clouds and showers that affected the
islands earlier today has cleared the state west, satellite imagery
revealed more low clouds have reached the eastern islands this
evening, bring more showers to mainly windward areas. Strong surface
high pressure that is providing the locally brisk trade winds is far
north of the islands and will stay for another day or so. Hence,
trade wind weather is to prevail across the state tonight and
Tuesday, with passing low clouds and showers affecting the islands
at times, mainly windward and mountain areas. Even the lee areas of
the smaller islands may see a few passing showers under the locally
brisk trades. Lee areas of the Big Island will experience daytime
and evening clouds, with upslope showers in the afternoon then
possibly a few showers along the coast at night.
The surface high far north is expected to lift further north by
mid-week. This will result in a slight relax of pressure gradient
across the area, leading to a slight decrease in trade winds for the
state. Latest forecast models still indicate this high will drop
southeast toward the weekend, with trade winds strengthening again
under the tighter pressure gradient across the area. Nevertheless,
trade wind weather will prevail in the island vicinity through the
The Central Pacific Hurricane Center in Honolulu is issuing
bulletins on Tropical Depression 19E. This system is located over a
thousand miles east-southeast of Hilo and is slow-moving. The system
is not expected to affect the islands weather this week.
Brief to TEMPO MVFR weather will occur over windward and mauka
areas tonight and Tuesday as showery low clouds ride in on the
breezy trade winds. However, VFR conditions will prevail overall
across the island chain.
An AIRMET for mountain obscuration continues through 2200 HST over
north and east sections of Kauai. Also, an AIRMET for low level
turbulence remains in effect for the area downwind from the
A Small Craft Advisory will continue for the windy areas around
the Big Island and Maui as the locally strong trades persist
overnight. Conditions may improve enough by late Wednesday for the
advisory to be dropped as the winds are expected to weaken a bit.
Surf will remain well below the advisory levels on all shores for
the next several days. Please see the Collaborative Surf Discussion
Small Craft Advisory until 6 PM HST Tuesday for Maalaea Bay, the
Pailolo and Alenuihaha Channels and waters south of the Big Island.