Area Forecast Discussion
Issued by NWS Honolulu, HI

Home | Current Version | Previous Version | Text Only | Print | Product List | Glossary On
Versions: 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50
000
FXHW60 PHFO 181952
AFDHFO

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE HONOLULU HI
952 AM HST THU SEP 18 2014

.SYNOPSIS...
WEAK HIGH PRESSURE NORTH OF THE AREA WILL BE DISRUPTED BY A
PASSING COLD FRONT OVER THE NEXT FEW DAYS. EAST WINDS WILL REMAIN
LIGHT THROUGH SATURDAY WITH DAYTIME SEA BREEZES AND OVERNIGHT LAND
BREEZES OCCURRING ACROSS THE STATE. CLOUDS AND SHOWERS WILL
INCREASE IN THE AFTERNOON WITH SKIES CLEARING AT NIGHT. HOT AND
MUGGY CONDITIONS WILL CONTINUE UNTIL THE RETURN OF TRADE WINDS
EARLY NEXT WEEK. INCREASING MOISTURE SOUTH OF THE ISLANDS MAY
BRING AN INCREASE IN RAINFALL OVER THE BIG ISLAND OVER THE
WEEKEND.

&&

.DISCUSSION...
HOT AND MUGGY CONDITIONS WILL CONTINUE THROUGH AT LEAST SATURDAY
WITH LIGHT WINDS PREVAILING. SKIES OVER THE ISLANDS THIS MORNING
WERE MOSTLY CLEAR ACROSS THE STATE WITH EXCEPTION OF WINDWARD OAHU
WHICH SAW SOME CLOUDS AND SHOWERS DRIFTING OVERHEAD FROM THE COASTAL
WATERS. EXPECT CLOUDS OVER THE ISLANDS TO INCREASE THROUGH THE
MORNING AND INTO THE AFTERNOON AS DAYTIME HEATING INCREASES WITH
WIDESPREAD SEA BREEZES EXPECTED IN THE AFTERNOON. SOME SPOTTY
SHOWERS CAN BE EXPECTED FOR THE AFTERNOON AND EVENING HOURS.

A WEAK HIGH PRESSURE NORTH OF THE STATE IS PROVIDING ENOUGH OF A
PRESSURE GRADIENT TO PRODUCE LIGHT EASTERLY FLOW THROUGH THE
ISLANDS. HOWEVER... LATE MORNING AND AFTERNOON SEA BREEZES WILL
EASILY OVERCOME THE WEAK SYNOPTIC FLOW. THE HIGH WILL BE DISRUPTED
FURTHER BY A PASSING COLD FRONT FRIDAY AND SATURDAY CONTINUING
LIGHT SYNOPTIC FLOW. SO...EXPECT A SIMILAR PATTERN THE NEXT FEW
DAYS WITH LIGHT WINDS...CLOUDS AND SPOTTY SHOWERS IN THE
AFTERNOONS... AND CLEARING AT NIGHT.

THE FRONT PUSHES OFF TO THE EAST BY SUNDAY AND A RIDGE TRIES TO
BUILD TO OUR NORTH. BOTH THE GFS AND ECMWF BRING LIGHT TRADES BACK
TO THE STATE SUNDAY FROM EAST TO WEST. IF THE FORECAST HOLDS UP...
SUNDAY WOULD BE A TRANSITION DAY FROM LIGHT AND VARIABLE TO LIGHT
TRADE WINDS. MOST LEEWARD AREAS WILL STILL SEE SEA BREEZES AS THE
TRADES FILTER IN. MORE RELIEF FROM THE HOT AND MUGGY CONDITIONS COMES
MONDAY AS HIGH PRESSURE INCREASES TO THE NORTH AND MODERATE TRADE
WINDS BLOW MORE COMFORTABLE CONDITIONS ACROSS THE STATE.

RAINFALL AND HUMIDITY MAY PICK UP OVER THE WINDWARD AND SOUTHEAST
SECTIONS OF THE BIG ISLAND FRIDAY NIGHT THROUGH SUNDAY AS AN AREA
OF TROPICAL MOISTURE SKIRTS BY TO THE SOUTH.

&&

.AVIATION...
LIGHT TRADE WINDS WILL ALLOW FOR THE DEVELOPMENT OF SEA BREEZES
TODAY. INTERIOR AND LEEWARD AREAS WILL LIKELY SEE CLOUD BUILDUPS AND
SHOWERS WITH ISOL MVFR CONDITIONS THROUGH THE AFTERNOON. THESE AREAS
SHOULD BEGIN TO CLEAR OUT WITH SUNSET. ISOL MVFR IN PASSING CLOUDS
AND SHOWERS IS LIKELY ALONG WINDWARD SLOPES. OTHERWISE...VFR WILL
PREVAIL AT ISLAND TERMINALS.


&&

.MARINE...
SMALL SWELLS WILL AFFECT ALMOST ALL SHORES THROUGH THE FORECAST
PERIOD. A SMALL BUT NEW SOUTHWEST SWELL WITH A LONG PERIOD OF 15 TO
17 SECONDS WILL ARRIVE FRIDAY AND CONTINUE THROUGH THE WEEKEND. A
SMALL SWELL FROM THE NORTHEAST IS DUE IN TODAY...PEAKING FRIDAY.
THE CURRENT NORTHWEST SWELL WILL BE REINFORCED BY ANOTHER SMALL
NORTHWEST SWELL EARLY NEXT WEEK.

WINDS WILL REMAIN LIGHT THROUGH MOST OF THE FORECAST PERIOD. THE
TRADE WINDS WILL BEGIN INCREASING EARLY NEXT WEEK.


&&

.HFO WATCHES/WARNINGS/ADVISORIES...
NONE.

&&

$$

MORRISON...DISCUSSION AND MARINE
EATON...AVIATION





USA.gov is the U.S. government's official web portal to all federal, state and local government web resources and services.