| Current Conditions | ||
| Temp |  | 9.5 C |
| RH | | 29 % |
| Wind | | E 6 mph |
| Road | | Open |
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Hawaiian Islands Synoptic Discussion and Guidance 618 FXHW60 PHFO 242015 AFDHFO AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE HONOLULU HI 1000 AM HST FRI MAY 24 2013 .SYNOPSIS... SURFACE HIGH PRESSURE NORTH OF THE AREA WILL KEEP TRADE WINDS BLOWING OVER THE ISLANDS THROUGH NEXT WEEK. WITH THE TRADES BLOWING...SHOWERS WILL BE FOCUSED OVER MAINLY WINDWARD AREAS EXCEPT FOR AFTERNOON SHOWERS OVER THE LEE SLOPES OF THE BIG ISLAND. A TROUGH ALOFT OVER THE AREA WILL HELP KEEP THE SHOWERS FAIRLY ACTIVE. && .DISCUSSION... A 1031 MB HIGH ABOUT 1350 MILES NORTHEAST OF THE ISLANDS WILL MAINTAIN LOCALLY BREEZY TRADE WINDS THROUGH THE HOLIDAY WEEKEND. THE TRADES WILL TAPER OFF A BIT TUESDAY AND WEDNESDAY AS THE HIGH WEAKENS AND MOVES CLOSER TO THE ISLANDS. THE TRADES WILL STRENGTHEN AGAIN LATER IN THE WEEK AS A NEW HIGH BUILDS FAR NORTHEAST OF THE AREA. AN EAST NORTHEAST TO WEST SOUTHWEST TROUGH ALOFT LIES ABOUT 250 MILES NORTHWEST OF KAUAI. THE TROUGH IS MAKING THE ATMOSPHERE A BIT UNSTABLE...ESPECIALLY NEAR KAUAI THANKS TO A LOW ALOFT WITHIN THE TROUGH 425 MILES WEST OF KAUAI. THE ATMOSPHERE OVER THE ISLANDS WILL STABILIZE OVER THE WEEKEND AS THE TROUGH MOVES SOUTHEAST AND THE LOW MOVES AWAY TO THE WEST. THE ATMOSPHERE MAY BECOME MORE UNSTABLE AGAIN EARLY NEXT WEEK...ESPECIALLY NEAR THE BIG ISLAND AS A NEW LOW FORMS EAST OF THE ISLANDS. IT REMAINS UNCERTAIN HOW BIG AN IMPACT THIS WILL HAVE ON LOCAL WEATHER. IN THE LATEST RUNS...THE GFS MODEL SHOWS MORE INSTABILITY THAN THE ECMWF. IT DOES NOT LOOK AS IF IT WILL GET UNSTABLE ENOUGH FOR THUNDERSTORMS OVER THE ISLANDS...BUT SHOWERS MAY GET MORE ACTIVE ON THE BIG ISLAND WHILE THE LOW ALOFT IS NEARBY. && .AVIATION... THE HAWAII TERMINALS WILL REMAIN MAINLY VFR WITH ISOLATED MVFR CEILINGS AND VIS OVER WINDWARD AREAS. AS THE TRADE WINDS STRENGTHEN...MODERATE LOW LEVEL TURBULENCE MAY DEVELOP AND REQUIRE AN AIRMET. && .MARINE... THE CURRENT NORTHWEST AND SOUTH SWELLS WILL BOTH CONTINUE DROPPING. NO OTHER SIGNIFICANT SWELLS ARE EXPECTED. && .HFO WATCHES/WARNINGS/ADVISORIES... SMALL CRAFT ADVISORY UNTIL 6 AM HST SUNDAY FOR THE WINDIER WATERS AROUND MAUI COUNTY AND THE BIG ISLAND. && $$ DONALDSON Bulletins, Forecasts and Observations are courtesy of Honolulu National Weather Service Forecast Office |
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