| Current Conditions | ||
| Temp |  | -3.3 C |
| RH | | 58 % |
| Wind | | SE 8 mph |
| Road | | Closed |
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Hawaiian Islands Synoptic Discussion and Guidance 013 FXHW60 PHFO 030758 AAA AFDHFO AREA FORECAST DISCUSSION...UPDATED NATIONAL WEATHER SERVICE HONOLULU HI 1000 PM HST MON MAR 2 2015 .UPDATE... I HAVE UPDATED THE FORECASTS TO INCREASE CLOUDS AND SHOWERS OVER KAUAI THIS EVENING AND DECREASE CLOUDS AND SHOWERS A BIT OVER OAHU AND MAUI COUNTY. ALSO...AIRMET SIERRA HAS BEEN UPDATED TO ADD MTN OBSC FOR KAUAI AND DROP MTN OBSC FOR THE BIG ISLAND. && .SYNOPSIS... HIGH PRESSURE NORTHWEST OF THE AREA WILL KEEP TRADE WINDS BLOWING OVER THE ISLANDS. A TROUGH ALOFT WILL KEEP THE WEATHER RATHER WET... ESPECIALLY ON THE BIG ISLAND OF HAWAII...THROUGH WEDNESDAY NIGHT. && .DISCUSSION... THE HEAVY SHOWERS THAT DEVELOPED OVER THE BIG ISLAND AND MAUI EARLIER TODAY HAVE MOSTLY DISSIPATED...BUT AS OF 800 PM SOME SHOWERS PERSISTED OVER THE SOUTHEAST SLOPES OF THE BIG ISLAND. HIGH PRESSURE TO THE NORTHWEST IS PRODUCING GENTLE TO FRESH TRADE WINDS ACROSS THE ISLANDS. THE TRADES ARE PUSHING ISOLATED LIGHT SHOWERS OVER WINDWARD AREAS OF THE SMALLER ISLANDS...BUT MOST AREAS OF THE SMALLER ISLANDS WILL BE DRY OVERNIGHT. THE WEATHER OVER THE BIG ISLAND WILL BE LESS ACTIVE TOMORROW WHILE MOSTLY DRY TRADE-WIND WEATHER WILL CONTINUE OVER THE SMALLER ISLANDS. A DEEP TROUGH ALOFT WILL PERSIST NORTH OF THE AREA FOR AT LEAST THE NEXT WEEK. A SHORT-WAVE TROUGH WITHIN THE LARGER TROUGH WILL APPROACH THE ISLANDS FROM THE NORTHWEST STARTING TUESDAY AFTERNOON. AS THE TROUGH APPROACHES...THE ATMOSPHERE WILL BECOME MORE UNSTABLE AND MOISTURE WILL SPREAD OVER THE ISLANDS FROM THE SOUTHEAST. ANOTHER ROUND OF HEAVY SHOWERS OR THUNDERSHOWERS IS POSSIBLE WITH GREATEST THREAT ON WEDNESDAY NIGHT ON THE BIG ISLAND. THE TROUGH ALOFT WILL ALSO LIKELY PRODUCE STRONG WINDS AND SNOW OVER THE HIGH ELEVATIONS ON THE BIG ISLAND. CLOUDS AND SHOWERS WILL SUBSIDE AGAIN STARTING THURSDAY AS THE SHORT-WAVE MOVES OFF TO THE NORTHEAST. MEANWHILE...A STRONG SURFACE HIGH WILL BUILD NORTHWEST OF THE AREA. STRENGTHENING TRADE WINDS WILL BRING DRIER AIR BACK OVER THE ISLANDS THROUGH THE END OF THE WEEK. THE TRADE WINDS MAY BE QUITE BREEZY THROUGH THE WEEKEND. && .AVIATION... VFR CONDITIONS WILL PREVAIL OVERNIGHT BUT A LINE OF SHOWERS WILL PRODUCE MVFR CONDITIONS ON KAUAI. AIRMET SIERRA HAS BEEN UPDATED TO DROP THE MTN OBSC ON THE BIG ISLAND AND ADD MTN OBSC ON KAUAI. MID TO UPPER LEVEL TURBULENCE REMAINS OVER THE BIG ISLAND AND MAUI DUE TO THE TROUGH ALOFT OVER THESE ISLANDS. AIRMET TANGO IS NOW IN EFFECT FOR MODERATE TURBULENCE...BUT WE EXPECT TO DROP THE AIRMET LATER TONIGHT. && .MARINE... A TROUGH CONTINUES TO PRODUCE ISOLATED THUNDERSTORMS OVER THE WATERS EAST THROUGH SOUTH OF THE BIG ISLAND. THE THUNDERSTORMS WILL LIKELY DIMINISH ON TUESDAY BUT MAY BECOME MORE ACTIVE AGAIN WEDNESDAY NIGHT. THE NORTHWEST SWELL THAT PROMPTED THE HIGH SURF ADVISORY ON SUNDAY HAS DIMINISHED RAPIDLY...SO THE ADVISORY HAS BEEN CANCELLED. COMBINED SEAS HAVE ALSO DROPPED...SO THE SMALL CRAFT ADVISORY WILL ALSO BE CANCELLED. TRADE WINDS WILL STRENGTHEN LATER IN THE WEEK AS A STRONG HIGH BUILDS NORTHWEST OF THE AREA. THIS WILL LIKELY REQUIRE A SMALL CRAFT ADVISORY FOR STRONG TRADE WINDS AND ROUGH SEAS. THE TRADE WINDS WILL PRODUCE ROUGH SURF ALONG EAST FACING SHORES. THIS SURF COULD REQUIRE A HIGH SURF ADVISORY LATER IN THE WEEK. OTHERWISE SURF IS EXPECTED TO REMAIN BELOW THE ADVISORY THRESHOLDS. && .HFO WATCHES/WARNINGS/ADVISORIES... NONE. && $$ DONALDSON Bulletins, Forecasts and Observations are courtesy of Honolulu National Weather Service Forecast Office |
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