| Current Conditions | ||
| Temp |  | -1.2 C |
| RH | | 41 % |
| Wind | | WNW 29 mph |
| Road | | Open |
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Hawaiian Islands Synoptic Discussion and Guidance 619 FXHW60 PHFO 110130 AFDHFO AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE HONOLULU HI 330 PM HST MON MAR 10 2014 .SYNOPSIS... TRADE WINDS WILL PREVAIL ACROSS THE MAIN HAWAIIAN ISLANDS THROUGH THE WEEK WITH CLOUDS AND SHOWERS FAVORING WINDWARD AND MAUKA AREAS. AN UPPER LEVEL TROUGH EAST OF THE ISLANDS MAY ENHANCE SHOWERS THROUGH TUESDAY. A COLD FRONT WILL REACH THE ISLANDS FRIDAY... BRINGING STRONG AND GUSTY TRADES IN ITS WAKE FOR THE WEEKEND. && .DISCUSSION... HIGH PRESSURE FAR NE OF THE ALOHA STATE AND ITS ASSOCIATED SFC RIDGE ARE KEEPING MODERATE TRADES ACROSS THE AREA. A PERSISTING PATTERN OF LOW CLOUDS AND PASSING SHOWERS WILL CONTINUE TO FAVOR WINDWARD AND MAUKA AREAS THROUGH THE WEEK. RADAR AND SATELLITE DATA SHOWED SHOWERS WITH LOCALIZED HEAVY RAIN AFFECTING AREAS OF KAUAI...INTERIOR AND S OAHU DURING THE AFTERNOON HOURS AS SEA BREEZES DEVELOPED AND PUSHED INLAND. MODEL GUIDANCE SHOW AN UPPER LVL TROUGH E OF THE ISLAND CHAIN BECOMING STRONGER BY THE MIDDLE OF THE WEEK WHILE GRADUALLY MOVING AWAY FROM THE AREA. THE INFLUENCE OF THIS TROUGH MAY BE STRONG ENOUGH TO BRING ENHANCED SHOWERS THROUGH TUE...ESPECIALLY AROUND THE BIG ISLAND. FOR TONIGHT...SOME LINGERING CLOUDS AND SHOWERS WILL REMAIN AROUND INTERIOR AND LEEWARD AREAS DURING THE EARLY EVENING HOURS...THEN MOST OF THE SHOWER ACTIVITY WILL FOCUS OVER WINDWARD SLOPES THROUGH TUE. THE AFOREMENTIONED HIGH PRESSURE SYSTEM IS EXPECTED TO MOVE FURTHER TO THE E AND AWAY FROM THE ISLANDS BY MIDWEEK...QUICKLY FOLLOWED BY ANOTHER MUCH STRONGER HIGH PRESSURE CELL MOVING IN FROM THE W. BY TUE...THE INCOMING HIGH WILL MOVE TO THE N OF THE ISLAND CHAIN AND BRING BACK A MODERATE TRADE WIND REGIME THROUGH FRI BEFORE A COLD FRONT REACHES KAUAI LATE FRI. BUT THIS WEAK FRONT IS NOT EXPECTED TO BRING SIGNIFICANT IMPACTS ACROSS THE AREA AS IT QUICKLY DISSIPATES....EXCEPT FOR WINDS WEAKENING A LITTLE BUT STILL REMAINING MAINLY FROM THE E. HIGH PRESSURE N OF THE ISLANDS WILL INTENSIFY DURING THE WEEKEND AND BRING INCREASINGLY STRONG AND GUSTY TRADES ACROSS THE ISLANDS. && .AVIATION... WITH LIGHT WINDS...CLOUDS AND SHOWERS HAVE DEVELOPED OVER THE INTERIOR OF ALL THE ISLANDS...LEADING TO AIRMET SIERRA BEING EXPANDED TO ALL THE ISLANDS. ANTICIPATE CONDITIONS TO IMPROVE OVER AT LEAST THE SMALLER ISLANDS OVERNIGHT. THESE CLOUDS AND CLOUDS ARE AT TIMES BRINGING MVFR AND IFR CONDITIONS TO SOME TERMINAL LOCATIONS. && .MARINE... A MODERATE NW SWELL WILL BUILD ON TUESDAY...PEAK ON WEDNESDAY...THEN LOWER SLOWLY ON THURSDAY. A SLIGHTLY LARGER NW SWELL IS EXPECTED TO BUILD THURSDAY NIGHT...WITH SURF EXPECTED TO REACH ADVISORY LEVELS BY FRIDAY ON SOME OF THE N AND W FACING SHORES. TRADE WINDS MAY REACH SMALL CRAFT ADVISORY STRENGTH...AT LEAST ACROSS THE TYPICALLY WINDY ZONES...BY MIDWEEK. WINDS WILL STRENGTHEN FURTHER THIS WEEKEND DUE TO A STRONG HIGH NW OF THE STATE BEHIND A PASSING FRONT. BY THEN...SMALL CRAFT ADVISORY CONDITIONS WILL LIKELY EXIST IN ALL COASTAL WATERS...WITH THE POSSIBILITY OF GALE WARNINGS IN THE CHANNELS. && .HFO WATCHES/WARNINGS/ADVISORIES... NONE. && $$ DISCUSSION/MARINE...REYNES AVIATION...M BALLARD Bulletins, Forecasts and Observations are courtesy of Honolulu National Weather Service Forecast Office |
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