| Current Conditions | ||
| Temp |  | 2.5 C |
| RH | | 7 % |
| Wind | | NE 24 mph |
| Road | | Open |
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Hawaiian Islands Synoptic Discussion and Guidance 583 FXHW60 PHFO 240140 AFDHFO AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE HONOLULU HI 400 PM HST MON NOV 23 2009 .SYNOPSIS... A HIGH FAR TO THE NORTHEAST WILL MAINTAIN MODERATE TRADE WINDS THROUGH TUESDAY. ANOTHER HIGH WILL PASS NORTH OF THE ISLANDS... RESULTING IN AN INCREASE IN THE TRADES LATE TUESDAY THROUGH THURSDAY. SHOWERS WILL FOCUS ON WINDWARD AND MAUKA SECTIONS. && .DISCUSSION... NO CHANGES IN THE FORECAST LOGIC OR ILLOGIC FROM THE PREVIOUS DISCUSSION. JUST FORGOT TO MENTION IN THAT DISCUSSION THAT AROUND MID-WEEK THERE MAY BE A SLIGHT INCREASE IN SHOWERS...PER THE GFS MODEL. AM NOT EXPECTING ANY SIGNIFICANT RAINFALL AMOUNTS. .PREV DISCUSSION... HIGHER PRESSURE TO THE NORTH AND LOWER PRESSURE TO THE SOUTH...PLUS THE EVER-PRESENT CORIOLIS EFFECT TURNING THE WINDS TO THE RIGHT... MEANS MORE TRADE WINDS THIS WEEK. THE TRADE WINDS WILL INCREASE A LITTLE TUESDAY NIGHT INTO THURSDAY WHEN AN EAST-MOVING HIGH PASSES TO OUR NORTH...TIGHTENING THE PRESSURE GRADIENT AS IT GOES. THE TRADES WILL RETURN TO LIGHT TO MODERATE THROUGH SATURDAY WHEN THE HIGH MOVES OFF TO THE NORTHEAST...THEN PICK UP AGAIN WHEN YET ANOTHER HIGH PASSES BY TO THE NORTH. A WEAKENING COLD FRONT MAY BRING SOME ORGANIZATION TO THE SHOWERS NEAR KAUAI NEXT SUNDAY. OTHERWISE...SHOWERS WILL REMAIN RANDOM... FAVORING THE USUAL WINDWARD AND MAUKA SECTIONS WITH AN EXPOSURE TO THE EAST WINDS. THE ABSENCE OF A DESTABILIZING UPPER LEVEL TROUGH OR LOW MEANS THAT THERE IS LITTLE OR NO CHANCE OF SIGNIFICANT RAINFALL THIS WEEK. && .MARINE... SURF ALONG NORTH AND WEST FACING SHORES WILL DROP BELOW ADVISORY LEVELS TUESDAY THEN RISE ABRUPTLY TUESDAY NIGHT AND WEDNESDAY. THE SECOND ROUND OF SURF COULD REQUIRE HIGH SURF WARNINGS FOR NORTH AND WEST FACING SHORES. THE SWELL WILL SLOWLY DECREASE THEREAFTER...BUT SURF MAY REMAIN AT ADVISORY LEVELS THROUGH THE REST OF THE WEEK. && .HFO WATCHES/WARNINGS/ADVISORIES... HIGH SURF ADVISORY UNTIL 6 AM HST TUESDAY FOR NORTH AND WEST SHORES OF NIIHAU AND KAUAI...AND NORTH SHORES OF OAHU MOLOKAI AND MAUI. && $$ CRAIG Bulletins, Forecasts and Observations are courtesy of Honolulu National Weather Service Forecast Office |
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