| Current Conditions | ||
| Temp |  | 0.5 C |
| RH | | 69 % |
| Wind | | W 27 mph |
| Road | | Open |
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Hawaiian Islands Synoptic Discussion and Guidance 825 FXHW60 PHFO 091402 AFDHFO AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE HONOLULU HI 402 AM HST SUN MAR 9 2014 .SYNOPSIS... MODERATE TRADE WINDS WILL PERSIST THIS WEEK...STRENGTHENING NEXT WEEKEND. CLOUDS AND SHOWERS WILL FAVOR WINDWARD AND MAUKA AREAS TODAY WITH BRIEF PASSING SHOWERS MAKING IT ONTO LEEWARD AREAS. WET WEATHER WILL CONTINUE FOR WINDWARD MAUI AND BIG ISLAND THROUGH TUESDAY. DRIER CONDITIONS EXPECTED FOR ALL AREAS WEDNESDAY THROUGH FRIDAY MORNING. ANOTHER FRONTAL SYSTEM WILL APPROACH THE ISLANDS LATE FRIDAY INTO THE WEEKEND. && .DISCUSSION... A FAIR AMOUNT OF CLOUDS AND SHOWERS REMAIN ACROSS THE STATE THIS MORNING. MODERATE-STRENGTH TRADE WINDS ARE FOCUSING MOST OF THE RAINFALL ONTO WINDWARD AND MAUKA AREAS...WITH BRIEF PASSING SHOWERS MAKING ONTO LEEWARD SIDES OF THE SMALLER ISLANDS. THE CLOUDS AND SHOWERS ARE DUE TO REMNANT MOISTURE FROM A FRONT THAT MOVED SOUTHEAST OF THE BIG ISLAND OVERNIGHT. THE ATMOSPHERE IS STABILIZING WITH AN 8000 FOOT INVERSION AND PRECIPITABLE WATER VALUE OF 0.95 INCHES ON THE LIHUE SOUNDING THIS MORNING. MOISTURE IS A BIT DEEPER AT HILO. EXPECT THE CLOUDS AND SHOWERS TO CARRY THROUGH MUCH OF THE DAY TODAY FOR WINDWARD AND MAUKA AREAS. LEEWARD AREAS SHOULD BEGIN TO SEE DECREASING SHOWERS AND PARTLY SUNNY SKIES BY AFTERNOON...EXCEPT FOR LEEWARD BIG ISLAND WHICH WILL RECEIVE TYPICAL AFTERNOON CLOUDS. BY TONIGHT / MONDAY...EXPECT MOST OF THE SHOWERS TO SLIDE EAST AND FOCUS ON THE WINDWARD SIDES OF MAUI AND THE BIG ISLAND. THE TRADE WINDS WILL CONTINUE TO PUSH MOISTURE ACROSS MAUI AND THE BIG ISLAND THROUGH TUESDAY. A TEMPORARY WEAKENING OF THE TRADE WINDS IS EXPECTED MONDAY AND MONDAY NIGHT AS ANOTHER FRONT PASSES NORTH OF THE STATE...BUT THIS WILL BE THE ONLY IMPACT TO OUR WEATHER. AN UPPER TROUGH WILL PASS JUST NORTHEAST OF THE BIG ISLAND TUESDAY AND WILL PROVIDE A BIT OF ENHANCEMENT TO THE SHOWERS. AFTERNOON CONVECTION ACROSS THE LEEWARD BIG ISLAND SLOPES WILL BE POSSIBLE MONDAY AND TUESDAY...WHILE THE ASSOCIATED JET STREAM WITH THE UPPER TROUGH MAY BRING WINDY CONDITIONS TO THE BIG ISLAND SUMMITS. MODERATE TRADES WILL FUEL DRIER AND MORE PLEASANT CONDITIONS TO THE WESTERN PART OF THE STATE MONDAY AND TUESDAY...THEN SPREAD TO ALL ISLANDS WEDNESDAY AND THURSDAY. ANOTHER FRONT AND UPPER TROUGH WILL PASS OVER THE STATE FRIDAY THROUGH SATURDAY NIGHT...BRINGING A HIGHER CHANCE FOR RAIN. A STRONG SURGE OF NORTHEASTERLY TRADE WINDS WILL BUILD IN RIGHT BEHIND THE FRONT. ASSUMING MODELS ARE CORRECT...THIS MAY SPARK A WIND ADVISORY FOR SOME OR ALL AREAS OF THE STATE BEGINNING FRIDAY NIGHT OR SATURDAY. WINDS WILL MIX WITH SHOWERS PROVIDING RATHER BLUSTERY CONDITIONS THROUGH THE WEEKEND. && .AVIATION... LOW CLOUDS ARE AFFECTING MAINLY THE WINDWARD AND MOUNTAIN AREAS EARLY THIS MORNING...AS TRADE WINDS CONTINUE OVER THE ISLANDS. MAINLY VFR CONDITIONS SHOULD PREVAIL ACROSS MUCH OF THE AREAS TODAY...EXCEPT FOR THE WINDWARD AND MOUNTAIN AREAS WHERE MVFR CEILING CONDITION MAY BE MORE PREVALENT. AIRMET SIERRA FOR MOUNTAIN OBSC FOR ALL WINDWARD MTN AREA CONTINUES EARLY THIS MORNING THOUGH IT MAY BE DROPPED LATER TODAY AS A DECREASE IN THE LOW CLOUDS IN THE ISLAND VICINITY IS EXPECTED. LAST OF THE LAYERED MID AND HIGH CLOUDS ARE EXITING THE BIG ISLAND AT THIS TIME. AIRMET ZULU FOR ICE IN THE BIG ISLAND VICINITY WILL BE CANCELED IN THE COMING HOURS. && .MARINE... THE CURRENT NORTHWEST SWELL OVER LOCAL WATERS WILL DECLINE TODAY AND MONDAY. A HIGH SURF ADVISORY IS NOW IN EFFECT THROUGH NOON TODAY FOR SELECT NORTH AND WEST FACING SHORES...SEE CFWHFO ON OUR WEBSITE FOR MORE INFORMATION. A MODERATE NORTHWEST SWELL WILL BUILD ON TUESDAY...PEAK ON WEDNESDAY...THEN LOWER SLOWLY ON THURSDAY. A SLIGHTLY LARGER NORTHWEST SWELL IS EXPECTED TO BUILD THURSDAY NIGHT...WITH SURF EXPECTED TO REACH ADVISORY LEVELS BY FRIDAY ON SOME OF THE NORTH AND WEST FACING SHORES. A SMALL CRAFT ADVISORY /SCA/ REMAINS POSTED FOR ALL WATERS EXPOSED TO THE NORTHWEST SWELL THROUGH NOON TODAY. SEAS ARE EXPECTED TO FALL BELOW SCA CRITERIA AS THE SWELL LOWERS THIS MORNING. BY MIDWEEK THE TRADE WINDS MAY BECOME STRONG ENOUGH TO BRING SCA BACK TO THE COASTAL WATERS...AT LEAST FOR THE TYPICAL WINDY ZONES. WINDS WILL STRENGTHEN FURTHER THIS WEEKEND DUE TO A STRONG HIGH NORTHWEST OF THE STATE BEHIND A PASSING FRONT. SCA CONDITIONS ARE LIKELY IN ALL COASTAL WATERS...WITH THE POSSIBILITY OF GALE WARNINGS IN THE CHANNELS. && .HFO WATCHES/WARNINGS/ADVISORIES... HIGH SURF ADVISORY UNTIL NOON HST TODAY FOR NORTH AND WEST FACING SHORES OF NIIHAU KAUAI OAHU AND MOLOKAI AND FOR NORTH FACING SHORES OF MAUI. SMALL CRAFT ADVISORY UNTIL NOON HST TODAY FOR ALL HAWAIIAN WATERS EXCEPT MAALAEA BAY- && $$ DISCUSSION/MARINE...FOSTER AVIATION...HUI Bulletins, Forecasts and Observations are courtesy of Honolulu National Weather Service Forecast Office |
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