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 190133
AFDHFO

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE HONOLULU HI
400 PM HST FRI APR 18 2014

.SYNOPSIS...
A TRADE WIND WEATHER PATTERN IS EXPECTED OVER THE NEXT SEVERAL DAYS
THANKS TO HIGH PRESSURE NORTH OF THE STATE. CLOUDS AND PASSING
SHOWERS WILL FAVOR WINDWARD AND MAUKA AREAS WITH A FEW SHOWERS
POSSIBLE OVER SOME LEEWARD LOCATIONS.

&&

.DISCUSSION...
A 1024 MB SURFACE HIGH IS CENTERED FAR TO THE NORTHEAST OF THE STATE
WITH A RIDGE EXTENDING WESTWARD TO A 1026 MB HIGH FAR TO THE
NORTHWEST OF THE STATE. THIS PLACES THE ISLANDS IN A MODERATE TRADE
WIND ENVIRONMENT. THE HIGH TO THE NORTHEAST IS EXPECTED TO WEAKEN
WHILE THE HIGH TO THE NORTHWEST STRENGTHENS A BIT AND MOVES EASTWARD
OVER THE WEEKEND AND ON INTO EARLY NEXT WEEK. AS THE HIGH
STRENGTHENS TO OUR NORTH...WE EXPECT A SLIGHT UPTICK IN TRADE WINDS
SPEEDS DURING THE SUNDAY AND MONDAY TIME PERIOD. THE HIGH WILL
CONTINUE MOVING EASTWARD TO A POSITION FAR TO OUR NORTHEAST BY THE
MIDDLE OF NEXT WEEK AND WEAKEN A BIT AS WELL. THUS TRADE WINDS WILL
LIKELY DROP BACK DOWN TO PRESENT LEVELS.

MOISTURE EMBEDDED IN THE TRADES IS PROVIDING FOR PASSING SHOWERS FOR
WINDWARD AND MAUKA AREAS WITH A FEW SHOWERS SPREADING OVER TO SELECT
LEEWARD AREAS AT TIMES. AN UPPER TROUGH SEEN ON SATELLITE IMAGERY
JUST TO THE SOUTHWEST OF THE STATE HAS RAISED INVERSION LEVELS A BIT
ALLOWING FOR SLIGHTLY HIGHER CLOUD DEVELOPMENT. THE 00Z SOUNDINGS
SHOW THAT THE INVERSION IS NEAR 9000 FEET. THE UPPER TROUGH IS
FORECAST TO LINGER NEAR THE AREA OVER THE NEXT SEVERAL DAYS. THUS
SHOWERS WILL CONTINUE TO FAVOR WINDWARD AND MAUKA AREAS AND WILL BE
HIGHLY DEPENDENT ON INCOMING MOISTURE AVAILABILITY. THE UPPER TROUGH
IS EXPECTED TO WEAKEN DURING THE SECOND HALF OF THE WEEK WITH A
SLIGHTLY DRIER WINDWARD AND MAUKA SHOWER PATTERN EXPECTED.

&&

.AVIATION...
AIRMET TANGO CONTINUES FOR LOW LEVEL TURBULENCE TO THE LEE OF THE
ISLANDS. THIS AIRMET IS EXPECTED TO CONTINUE THROUGH AT LEAST
SATURDAY.

CLOUDS AND SHOWERS ARE FOCUSED OVER WINDWARD AND MAUKA AREAS...WHICH
AT TIMES WILL BRING MVFR CONDITIONS TO THOSE AREAS. OTHERWISE...VFR
CONDITIONS ARE EXPECTED...WITH PASSING HIGH CLOUDS.

&&

.MARINE...
A SMALL CRAFT ADVISORY REMAINS POSTED THROUGH SUNDAY AFTERNOON FOR
THE TYPICALLY WINDY WATERS AROUND MAUI AND THE BIG ISLAND. THIS WILL
LIKELY HAVE TO BE EXTENDED INTO EARLY NEXT WEEK AS MODERATE TO FRESH
TRADE WINDS ARE EXPECTED TO CONTINUE INTO THE FORESEEABLE FUTURE.

THE CURRENT SMALL NORTHWEST SWELL WILL CONTINUE TO LOWER OVERNIGHT.
ANOTHER SMALL NORTHWEST SWELL IS EXPECTED TO FILL IN OVER THE
WEEKEND. TRADE WINDS WILL CONTINUE TO PRODUCE SHORT PERIOD CHOPPY
SURF ALONG EAST FACING SHORES.

&&

.HFO WATCHES/WARNINGS/ADVISORIES...
SMALL CRAFT ADVISORY UNTIL 6 PM HST SUNDAY FOR MAALAEA BAY-
PAILOLO CHANNEL-ALENUIHAHA CHANNEL-BIG ISLAND LEEWARD WATERS-BIG
ISLAND SOUTHEAST WATERS.

&&

$$

SYNOPSIS/DISCUSSION/MARINE...BURKE
AVIATION...M BALLARD




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