NWS Bulletins for NPAC - MKWC
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Hawaiian Islands Synoptic Discussion and Guidance
296
FXHW60 PHFO 190143
AFDHFO
Area Forecast Discussion
National Weather Service Honolulu HI
343 PM HST Thu Apr 18 2024
.SYNOPSIS...
Mostly dry trade wind conditions will prevail through next week.
Breezy northeast trade winds will briefly weaken over the weekend,
then become breezy again out of the east early next week. Clouds
and brief showers will favor windward and mauka locations, mainly
during the overnight through early morning hours, as areas of
moisture move through periodically.
&&
.DISCUSSION...
Mostly dry conditions will prevailing through next week as a
series of surface highs build and pass north of the state. The
low-level flow has shifted out of the northeast and wind speeds
will become breezy by this evening. Despite the dry conditions in
place, a weak upper trough and a remnant low-level moisture
boundary settling south into the smaller islands are supporting
scattered showers moving into windward areas of Oahu and Kauai
today. High-res models show this band sagging southward overnight,
bringing some additional showers to windward Maui County, before
diminishing Friday.
The breezy trades will hold Friday, then ease into the light to
moderate range over the weekend as a weakness forms in the surface
ridge due to a low passing far to the north. The southern extent
of a mid- to upper-level trough associated with this system will
pass near the islands to the north late Friday into the weekend,
which could support a slight increase in windward shower coverage
during the overnight/early mornings. Rising upper heights along
with a strengthening surface ridge to the north will support dry
conditions prevailing early next week with breezy easterly trades
returning.
&&
.AVIATION...
Local visible imagery shows a coherent area of low-level moisture
that has socked in the island of Kauai and is approaching Oahu
from the east. Today's trends suggest little or no improvement can
be expected for Kauai through at least the first half of tonight.
Save for a couple hours during peak heating this afternoon, IFR
conditions are likely to persist. Conditions will deteriorate
over windward and mauka sections of Oahu this evening. The eastern
half of the state is characterized by high stability and a
general dearth of moisture. Trade wind showers will be quite
limited here. Moderate trades strengthen slightly for Friday.
AIRMET Sierra for IFR remains in effect for Kauai.
AIRMET Sierra for tempo mountain obscuration may be needed for
Oahu later this evening.
&&
.MARINE...
Moderate to fresh trades will persist through Friday weakening
slightly over the weekend. Trades will become fresh to locally
strong early next week.
Small surf along south facing shores expected through Tuesday. A
small, long-period swell arrives Tuesday night. Small, short-
period north swell will continue into early Sunday when another
small, reinforcing north swell arrives through early next week.
Surf along east facing shores will remain small but can expect a
minor boost as winds pick up Monday.
&&
.HFO WATCHES/WARNINGS/ADVISORIES...
Small Craft Advisory until 6 PM HST Friday for Maalaea Bay-
Pailolo Channel-Alenuihaha Channel-Big Island Leeward Waters-Big
Island Southeast Waters.
&&
$$
DISCUSSION...TS
AVIATION...JVC
MARINE...Foster
Bulletins, Forecasts and Observations are courtesy of Honolulu National Weather Service Forecast Office
Narrow the Menu List
Select Time Limit: 12 hours | 24 hours | 48 hours | 72 hours | No time limit
Select Product Type: All | Routine Bulletins/FCSTS | Warnings/Watches/Advisories | HAWN Weather | Tropical | Marine | Aviation | Daily Obs | Special
Hawaiian Islands Synoptic Discussion and Guidance
296
FXHW60 PHFO 190143
AFDHFO
Area Forecast Discussion
National Weather Service Honolulu HI
343 PM HST Thu Apr 18 2024
.SYNOPSIS...
Mostly dry trade wind conditions will prevail through next week.
Breezy northeast trade winds will briefly weaken over the weekend,
then become breezy again out of the east early next week. Clouds
and brief showers will favor windward and mauka locations, mainly
during the overnight through early morning hours, as areas of
moisture move through periodically.
&&
.DISCUSSION...
Mostly dry conditions will prevailing through next week as a
series of surface highs build and pass north of the state. The
low-level flow has shifted out of the northeast and wind speeds
will become breezy by this evening. Despite the dry conditions in
place, a weak upper trough and a remnant low-level moisture
boundary settling south into the smaller islands are supporting
scattered showers moving into windward areas of Oahu and Kauai
today. High-res models show this band sagging southward overnight,
bringing some additional showers to windward Maui County, before
diminishing Friday.
The breezy trades will hold Friday, then ease into the light to
moderate range over the weekend as a weakness forms in the surface
ridge due to a low passing far to the north. The southern extent
of a mid- to upper-level trough associated with this system will
pass near the islands to the north late Friday into the weekend,
which could support a slight increase in windward shower coverage
during the overnight/early mornings. Rising upper heights along
with a strengthening surface ridge to the north will support dry
conditions prevailing early next week with breezy easterly trades
returning.
&&
.AVIATION...
Local visible imagery shows a coherent area of low-level moisture
that has socked in the island of Kauai and is approaching Oahu
from the east. Today's trends suggest little or no improvement can
be expected for Kauai through at least the first half of tonight.
Save for a couple hours during peak heating this afternoon, IFR
conditions are likely to persist. Conditions will deteriorate
over windward and mauka sections of Oahu this evening. The eastern
half of the state is characterized by high stability and a
general dearth of moisture. Trade wind showers will be quite
limited here. Moderate trades strengthen slightly for Friday.
AIRMET Sierra for IFR remains in effect for Kauai.
AIRMET Sierra for tempo mountain obscuration may be needed for
Oahu later this evening.
&&
.MARINE...
Moderate to fresh trades will persist through Friday weakening
slightly over the weekend. Trades will become fresh to locally
strong early next week.
Small surf along south facing shores expected through Tuesday. A
small, long-period swell arrives Tuesday night. Small, short-
period north swell will continue into early Sunday when another
small, reinforcing north swell arrives through early next week.
Surf along east facing shores will remain small but can expect a
minor boost as winds pick up Monday.
&&
.HFO WATCHES/WARNINGS/ADVISORIES...
Small Craft Advisory until 6 PM HST Friday for Maalaea Bay-
Pailolo Channel-Alenuihaha Channel-Big Island Leeward Waters-Big
Island Southeast Waters.
&&
$$
DISCUSSION...TS
AVIATION...JVC
MARINE...Foster
Bulletins, Forecasts and Observations are courtesy of Honolulu National Weather Service Forecast Office