| Current Conditions | ||
| Temp |  | 6.7 C |
| RH | | 32 % |
| Wind | | ESE 11 mph |
| Road | | Open |
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Hawaiian Islands Synoptic Discussion and Guidance 705 FXHW60 PHFO 231349 AFDHFO AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE HONOLULU HI 400 AM HST WED JUL 23 2014 .SYNOPSIS... DRIER AND LOCALLY BREEZY TRADE WIND WEATHER WILL PREVAIL ACROSS THE STATE THROUGH THE NEXT FEW DAYS. PASSING SHOWERS WILL AFFECT MAINLY WINDWARD AND MOUNTAIN AREAS. THE ISLANDS MAY EXPERIENCE SLIGHTLY WEAKER TRADE WINDS BY THE WEEKEND AND AN INCREASE IN SHOWERS TOWARDS THE LATER PART OF THE WEEKEND INTO EARLY NEXT WEEK. && .DISCUSSION... TRADE WIND WEATHER PREVAILS ACROSS THE ISLANDS EARLY THIS MORNING...WITH PASSING LOW CLOUDS AND SHOWERS AFFECTING WINDWARD AND MOUNTAIN AREAS AT TIMES. EARLY MORNING LIHUE AND HILO SOUNDINGS CONTINUE TO REVEAL A SOMEWHAT UNSTABLE AND MOIST AIR MASS IN THE ISLAND VICINITY. EARLY MORNING SATELLITE IMAGERY ALSO SHOWED AREAS OF LOW CLOUDS EAST OF THE STATE. THESE LOW CLOUDS WILL REACH THE ISLANDS THROUGH REST OF THE MORNING...BRINGING MORE SHOWERS. AT LEAST THE DEW POINT READINGS ACROSS THE REPORTING STATIONS ARE STILL EXHIBITING A GOOD DOWNWARD TREND...COMPARED TO 24 HOURS AGO. A SURFACE HIGH PRESSURE WILL PERSIST FAR NORTH OF THE ISLANDS...AND WILL CONTINUE TO SUPPLE TRADE WINDS TO THE STATE. WINDS HAVE ALREADY STRENGTHEN A BIT COMPARED TO 24 HOURS AGO...AND SHOULD TREND SLIGHTLY UPWARD LATER TODAY. LATEST FORECAST MODELS STILL INDICATE A DRIER AIR MASS WILL SPREAD OVER THE STATE LATER TODAY...WHILE WEAK UPPER LEVEL RIDGING DEVELOPS OVER THE ISLANDS. THEREFORE ATMOSPHERIC CONDITIONS WILL BECOME MORE STABLE WITH LESS MOISTURE AS THE DAY PROGRESSES. EXPECT TYPICAL DRIER SUMMER TRADE WIND WEATHER TO RETURN THROUGH THE NEXT FEW DAYS...WITH PASSING LOW CLOUDS AND SHOWERS AFFECTING MAINLY WINDWARD AND MOUNTAIN AREAS. BIG ISLAND LEE AREAS WILL SEE AFTERNOON AND EVENING CLOUDS AND SHOWERS. LATEST FORECAST MODELS INDICATE THE SURFACE HIGH PRESSURE FAR NORTH WILL WEAKEN AND MOVE EAST BY THE WEEKEND. AN INCREASE IN LOW LEVEL MOISTURE OVER THE ISLANDS FROM THE EAST IS ALSO EXPECTED TOWARDS THE LATER PART OF THE WEEKEND...WITH AN UPPER LEVEL JET PASSING OVER THE STATE. THIS WILL RESULT IN THE EASING OF THE TRADES OVER THE ISLANDS BY THE WEEKEND...AND A POSSIBLE BOOST TO THE RAINFALL TO THE STATE...MAINLY FOR THE WINDWARD AREAS BY THE LATER PART OF THE WEEKEND INTO EARLY NEXT WEEK. && .MARINE... A SMALL CRAFT ADVISORY /SCA/ REMAINS IN EFFECT FOR THE TYPICALLY WINDY WATERS AROUND THE BIG ISLAND AND MAUI DUE TO FRESH TO LOCALLY STRONG TRADE WINDS. WINDS WILL PEAK LATER TODAY AND THURSDAY...THEN DECLINE SLIGHTLY TOWARDS THE WEEKEND TO NEAR SCA LEVELS ACROSS THOSE TYPICALLY WINDY COASTAL AREAS. NO SIGNIFICANT SWELLS ARE SEEN FOR THE UPCOMING WEEK. THE BIGGEST SURF WILL FROM TRADE WIND SWELL ALONG EAST FACING SHORES. SEE THE COLLABORATIVE NEARSHORE SWELL AND WIND FORECAST FOR OAHU /SRDHFO/ FOR MORE DETAILS. && .AVIATION... VFR CONDITIONS WILL PREVAIL FOR ALL SITES...THOUGH BRIEF MVFR CEILING CONDITIONS DUE TO THE PASSING LOW CLOUDS MAY AFFECT WINDWARD AND MAUKA AREAS. LEE AREAS OF THE BIG ISLAND MAY ALSO EXPERIENCE BRIEF MVFR CEILING CONDITIONS IN THE AFTERNOON AND EVENING HOURS. AIRMET FOR LOW LEVEL TURB IN THE LEE OF THE TERRAIN FOR THE SMALLER ISLANDS WILL CONTINUE DUE TO THE MODERATE TRADE WINDS. && .HFO WATCHES/WARNINGS/ADVISORIES... SMALL CRAFT ADVISORY THROUGH 6 PM HST THURSDAY FOR THE PAILOLO AND ALENUIHAHA CHANNELS...MAALAEA BAY AND WATERS SOUTH OF THE BIG ISLAND. && $$ HUI Bulletins, Forecasts and Observations are courtesy of Honolulu National Weather Service Forecast Office |
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