| Current Conditions | ||
| Temp |  | 1.1 C |
| RH | | 18 % |
| Wind | | W 42 mph |
| Road | | Open |
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Hawaiian Islands Synoptic Discussion and Guidance 649 FXHW60 PHFO 231336 AFDHFO AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE HONOLULU HI 330 AM HST THU MAY 23 2013 .SYNOPSIS... THE LIGHT WINDS ACROSS THE ISLANDS WILL GRADUALLY TRANSITION TO A TRADE WIND FLOW STARTING TONIGHT...WITH SEA BREEZES BRINGING ONE MORE ROUND OF SHOWERS THIS AFTERNOON AND EVENING. BEST CHANCES OF RAIN WILL REMAIN OVER INTERIOR AND MOUNTAIN AREAS. A MORE TYPICAL TRADE WIND WEATHER REGIME WILL RETURN FOR THE WEEKEND WITH SHOWER ACTIVITY FOCUSING OVER WINDWARD AREAS. && .DISCUSSION... AN UPPER LVL TROUGH IS BEING OBSERVED ON WV SATELLITE DATA...LOCATED SOME 750 MILES NE OF THE MAIN HAWAIIAN ISLANDS. SFC ANALYSES SHOW TWO DECAYING TROUGHS...ONE JUST N OF THE BIG ISLAND AND THE OTHER LINGERING AROUND 400 MILES N OF KAUAI. MEANWHILE...A BROAD SFC HIGH REMAINS CENTERED FAR TO THE NE OF THE MAIN HAWAIIAN ISLANDS. THE SFC TROUGHS WILL CONTINUE TO BREAK DOWN TODAY AND ALLOW FOR AN ONSET OF RETURNING TRADE WINDS ACROSS THE ISLANDS...BUT NOT QUICK ENOUGH IN ORDER TO OVERRIDE SEA BREEZE CIRCULATIONS THIS AFTERNOON. THEREFORE...THERE SHOULD BE ONE MORE ROUND OF CONVECTION TODAY WITH SHOWERS FAVORING INTERIOR AND MOUNTAIN AREAS AS SEA BREEZES PUSH INLAND. THE INFLUENCE OF THE UPPER LVL TROUGH IS STILL KEEPING TIGHT GRADIENTS AT THE MID/UPPER LVLS...WITH STRONG WINDS AROUND 14-15 KFT EXPECTED TO CONTINUE TODAY. THUS...THE WIND ADVISORY FOR THE BIG ISLAND SUMMITS IS NOW VALID THROUGH 6 PM HST THIS EVENING...AND IT MAY BE EXTENDED IF NECESSARY. THE SFC HIGH NE OF THE ISLANDS WILL STRENGTHEN DURING THE NEXT COUPLE OF DAYS. THIS WILL BRING A TRADE WIND WEATHER REGIME ACROSS THE ALOHA STATE...STARTING TONIGHT AND BECOMING MODERATE TO FRESH THROUGH THE END OF THE WEEK. GLOBAL MODELS REMAIN IN FAIR AGREEMENT WITH THIS OVERALL SCENARIO FOR THE LONG TERM FORECAST...WITH UPSTREAM MOISTURE FEEDING WINDWARD AND MAUKA SHOWERS AS THE TRADES ESTABLISH. && .AVIATION... THOUGH TRADES ARE SLOWLY RETURNING...WINDS ARE LIGHT ENOUGH TO BRING CLOUD BUILDUPS OVER INTERIOR SECTIONS OF THE ISLANDS. HENCE...BRIEF MVFR CONDITIONS ARE POSSIBLE THIS AFTERNOON OVER THE ISLANDS...AS WELL AS LOCAL MVFR VIS IN THE VICINITY OF PHTO DUE TO VOLCANIC EMISSIONS. OTHERWISE...PREVAILING VFR CONDITIONS ARE EXPECTED AT ALL TERMINALS TODAY. && .MARINE... THE SOUTH SWELL WILL KEEP DECREASING AND REMAINING BELOW ADVISORY CRITERIA DURING THE NEXT SEVERAL DAYS. THE NORTHWEST SWELL WILL GRADUALLY DIMINISH THROUGH THE WEEKEND. TRADE WINDS WILL STRENGTHEN THROUGH THE WEEK...AND ARE EXPECTED TO REACH SMALL CRAFT ADVISORY LEVELS OVER THE WINDIER LOCATIONS NEAR MAUI COUNTY AND THE BIG ISLAND BY THE WEEKEND. && .HFO WATCHES/WARNINGS/ADVISORIES... WIND ADVISORY UNTIL 6 PM HST THIS EVENING FOR BIG ISLAND SUMMITS. && $$ DISCUSSION/MARINE...REYNES AVIATION...LUTU-MCMOORE Bulletins, Forecasts and Observations are courtesy of Honolulu National Weather Service Forecast Office |
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