Area Forecast Discussion
Issued by NWS Honolulu, HI

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000
FXHW60 PHFO 150600
AFDHFO

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE HONOLULU HI
800 PM HST SUN SEP 14 2014

.SYNOPSIS...
HOT AND HUMID CONDITIONS WILL CONTINUE THROUGH MUCH OF THE WEEK.
LIGHT WINDS WILL PERSIST THROUGH WEDNESDAY...ALLOWING FOR AFTERNOON
SEA BREEZES AND MUGGY CONDITIONS. SPOTTY SHOWERS ARE EXPECTED
TONIGHT OVER THE SMALLER ISLANDS AS AN OLD FRONTAL BOUNDARY PASSES
THROUGH. OTHERWISE... CLOUDS AND SHOWERS WILL FORM IN THE
AFTERNOONS WITH OVERNIGHT LAND BREEZES CLEARING SKIES. LIGHT TRADE
WINDS WITH LEEWARD SEA BREEZES ARE EXPECTED FOR THE SECOND HALF
OF THE WEEK.

&&

.DISCUSSION...
LOW PRESSURE NORTHWEST OF THE STATE HAS CUT OFF TRADE WINDS...
LEAVING THE ISLANDS UNDER A STABLE CONVECTIVE REGIME. SEA BREEZES
AND SPOTTY AFTERNOON SHOWERS WILL FORM IN THE AFTERNOONS... WITH
GENTLE DOWNSLOPE FLOW PARTIALLY CLEARING SKIES AT NIGHT. LIGHT
NORTHERLY FLOW NEAR THE SURFACE IS SLOWLY PUSHING AN OLD FRONTAL
BOUNDARY ASSOCIATED WITH THE AFOREMENTIONED LOW OVER THE SMALLER
ISLANDS TONIGHT.

A RAGGED THIN LINE OF SHOWERS ASSOCIATED WITH THE FRONTAL
BOUNDARY IS NOW LOCATED ACROSS THE NORTHERN TIP OF OAHU AND
STRETCHES EAST... JUST NORTH OF MOLOKAI. SKIES REMAIN CLOUDY OVER
OAHU WITH SOME SPOTTY SHOWERS FALLING OVERNIGHT. SOME OF THESE
SHOWERS WILL REACH THE NORTHERN SLOPES OF MOLOKAI AND MAUI LATER
TONIGHT. OVER THE GARDEN ISLE...PARTLY CLOUDY SKIES WILL PREVAIL
TONIGHT WITH A FEW POP-UP SHOWERS FORMING ALONG THE TAIL END OF
THE FRONTAL BOUNDARY. THE BIG ISLAND LOOKS TO BE DRY THROUGH THE
NIGHT WITH CLEARING SKIES. BY MONDAY AFTERNOON...MOST AREAS WILL HAVE
AT LEAST PARTLY CLOUDY SKIES AS SEA BREEZES KICK IN AND DAYTIME
HEATING IS AT ITS MAXIMUM. SPOTTY SHOWERS ARE EXPECTED WITH SOME
BRIEF DOWNPOURS POSSIBLE.

DEW POINTS AROUND THE STATE HAVE INCREASED A NOTCH OVER THE PAST
12 HOURS AND ARE NOW HOVERING IN THE LOW 70/S... MAKING WEATHER
CONDITIONS FEEL STICKY AND UNCOMFORTABLE. SIMILAR CONDITIONS ARE
EXPECTED THROUGH THE WEEK. AS THE OLD FRONTAL BOUNDARY PUSHES
THROUGH THE ISLANDS TONIGHT AND MONDAY... DEW POINTS WILL INCREASE
A BIT FURTHER. COMBINE THESE HIGHER DEW POINTS WITH HIGH
TEMPERATURES NEAR 90 DEGREES F... AND AFTERNOON CONDITIONS WILL GO
FROM STICKY AND UNCOMFORTABLE INTO THE OPPRESSIVE RANGE ON MONDAY.
SLIGHTLY LOWER DEW POINTS ARE EXPECTED FOR THE REST OF THE WEEK...
BUT THE HOT AND HUMID CONDITIONS WILL REMAIN.

A WEAK HIGH PRESSURE TO THE NORTHWEST WILL BRING LIGHT TRADE
WINDS BACK TO THE ISLANDS WEDNESDAY AND FOR THE SECOND HALF OF THE
WEEK. HOWEVER... MUGGY CONDITIONS WILL CONTINUE. THE TRADES WILL FOCUS
SHOWERS OVER THE WINDWARD SLOPES BUT AFTERNOON LEEWARD SEA BREEZES
WILL BRING SPOTTY CLOUDS AND LIMITED SHOWERS TO LEEWARD AND
INTERIOR AREAS.

&&

.AVIATION...
CONVECTIVE LOW CLOUDINESS FROM DAYTIME HEATING WILL DISSIPATE AS
THE EVENING PROGRESSES...LEADING TO CLEARING OVER THE EASTERN END OF
THE ISLAND CHAIN.

HOWEVER...A  DIFFUSE BAND OF MOISTURE JUST NORTH OF THE STATE MAY
PRODUCE BRIEF MVFR CIGS AND VIS IN SHRA AS IT MOVES OVER NORTH
FACING TERRAIN OF KAUAI...OAHU...AND MOLOKAI OVERNIGHT.

&&

.MARINE...
WINDS AND SEAS ARE EXPECTED TO REMAIN BELOW SMALL CRAFT ADVISORY
LEVELS THROUGH THE FORECAST PERIOD.

THE CURRENT LONG PERIOD SOUTH SWELL IS PRODUCING ADVISORY LEVEL SURF
ALONG SOUTH FACING SHORES. THE ADVISORY HAS BEEN EXTENDED THROUGH
MONDAY NIGHT. THE SOUTH SWELL WILL SLOWLY SUBSIDE MONDAY THROUGH
WEDNESDAY. SMALL SOUTHERLY SWELLS ARE EXPECTED THURSDAY THROUGH
SATURDAY TIME PERIOD.

THE CURRENT SMALL NORTHWEST SWELL WILL GRADUALLY LOWER ON TUESDAY.
OTHER SMALL NORTH NORTHWEST SWELLS CAN BE EXPECTED DURING THE
REST OF THE WEEK.

&&

.HFO WATCHES/WARNINGS/ADVISORIES...
HIGH SURF ADVISORY UNTIL 6 AM HST TUESDAY FOR NIIHAU-KAUAI
WINDWARD-KAUAI LEEWARD-OAHU SOUTH SHORE-WAIANAE COAST-MOLOKAI
LEEWARD-LANAI MAKAI-KAHOOLAWE-MAUI LEEWARD WEST-MAUI CENTRAL
VALLEY-WINDWARD HALEAKALA-LEEWARD HALEAKALA-KONA-SOUTH BIG
ISLAND-BIG ISLAND NORTH AND EAST.


&&

$$

MORRISON...PUBLIC AND MARINE
KINEL...AVIATION




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