| Current Conditions | ||
| Temp |  | -1.5 C |
| RH | | 20 % |
| Wind | | NW 28 mph |
| Road | | Open |
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Hawaiian Islands Synoptic Discussion and Guidance 748 FXHW60 PHFO 301330 AFDHFO AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE HONOLULU HI 330 AM HST FRI JAN 30 2015 .SYNOPSIS... CLOUDS AND SHOWERS ALONG A WEAKENING FRONT WILL AFFECT THE SMALLER ISLANDS THIS MORNING AND SPREAD TO THE BIG ISLAND LATER TODAY. A RIDGE BUILDING NORTHEAST OF THE AREA WILL PRODUCE GENTLE TRADE WINDS THROUGH THE WEEKEND WITH SCATTERED WINDWARD SHOWERS AND DRY WEATHER OVER LEEWARD AREAS. A LARGE AREA OF LOW PRESSURE NORTH OF THE AREA WILL BRING WEST WINDS AND UNSETTLED WEATHER STARTING MONDAY NIGHT AND EXTENDING THROUGH THE COMING WEEK. && .DISCUSSION... A NORTHEAST TO SOUTHWEST CLOUD BAND ASSOCIATED WITH A DISSIPATING FRONT WILL BRING CLOUDY SKIES AND SHOWERS TO THE ISLANDS TODAY. SHOWERS COULD BE BRIEFLY HEAVY THIS MORNING....BUT SINCE THE SHOWERS WILL BE MOVING BY RATHER QUICKLY RAINFALL TOTALS WILL BE MODEST. A RIDGE WILL BUILD NORTHEAST OF THE AREA TONIGHT AND PRODUCE GENTLE TRADE WINDS THROUGH THE WEEKEND. THE TRADES WILL BRING SCATTERED SHOWERS TO WINDWARD AREAS WHILE LEEWARD AREAS WILL BE MOSTLY DRY. A HUGE AREA OF LOW PRESSURE IN THE NORTH PACIFIC WILL SAG SOUTH EARLY NEXT WEEK. WINDS WILL SHIFT OUT OF THE SOUTH ON MONDAY...THEN VEER OUT OF THE WEST ON TUESDAY. THE WESTERLY FLOW WILL PUSH A SERIES OF FRONTAL BANDS OVER THE ISLANDS THROUGH NEXT WEEK. THESE FRONTAL BAND WILL LIKELY KEEP THE ISLANDS RATHER CLOUDY AND SHOWERY THROUGH THE WEEK. STRONG WINDS ARE LIKELY FOR THE HIGHER ELEVATIONS AND THE WINDS COULD BECOME STRONG OVER THE LOWER ELEVATIONS BY LATE NEXT WEEK. THE GLOBAL MODELS HAVE BEEN SOMEWHAT INCONSISTENT WITH THIS COMPLICATED PATTERN...SO DETAILS ON THE TIMING AND STRENGTH OF THE FRONTAL BANDS REMAIN UNCERTAIN. && .AVIATION... CLOUDS AND SHOWERS ASSOCIATED WITH AN OLD FRONTAL BAND WILL PRODUCE OCCASIONAL MVFR CEILINGS. AIRMET SIERRA MAY BE NEEDED FROM KAUAI TO MAUI THIS MORNING AND MVFR CEILING COULD SPREAD TO THE BIG ISLAND THIS AFTERNOON. && .MARINE... NEW NORTHWEST SWELLS WILL ARRIVE TODAY AND SATURDAY...PRODUCING ELEVATED SURF THROUGH THE WEEKEND. THESE SWELLS WILL BE MORE NORTHERLY THAN RECENT SWELLS AND WILL HAVE LESS IMPACT ON WEST FACING SHORES. SURF WILL GRADUALLY DIMINISH MONDAY AND TUESDAY. WINDS ARE EXPECTED TO REMAIN BELOW THE 25 KT SMALL CRAFT ADVISORY...SCA...LEVEL CRITERIA THROUGH AT LEAST THE WEEKEND...BUT COMBINED SEAS RISING OVER 10 FEET DUE TO THE NORTHWEST SWELLS MAY REQUIRE A SCA BY SATURDAY. && .HFO WATCHES/WARNINGS/ADVISORIES... HIGH SURF ADVISORY FOR NORTH AND WEST FACING SHORES OF NIIHAU AND KAUAI AND NORTH FACING SHORES OF OAHU MOLOKAI AND MAUI. && $$ DONALDSON Bulletins, Forecasts and Observations are courtesy of Honolulu National Weather Service Forecast Office |
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