| Current Conditions | ||
| Temp |  | 0.4 C |
| RH | | 99 % |
| Wind | | SE 19 mph |
| Road | | Closed |
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Hawaiian Islands Synoptic Discussion and Guidance 671 FXHW60 PHFO 080809 AFDHFO AREA FORECAST DISCUSSION...UPDATED NATIONAL WEATHER SERVICE HONOLULU HI 1008 PM HST SAT DEC 7 2013 .UPDATE... THE SMALL CRAFT ADVISORY HAS BEEN EXPANDED TO INCLUDE MOST OF THE WINDWARD WATERS OF ALL THE ISLANDS. SEE THE MARINE SECTION BELOW FOR DETAILS. && .SYNOPSIS... WEAK HIGH PRESSURE OVER THE ISLAND CHAIN WILL KEEP LIGHT WINDS WITH INCREASING HAZE AND HUMIDITY DURING THE NEXT FEW DAYS. AN UPPER LEVEL LOW WELL SOUTH OF THE ISLANDS WILL PUSH ENOUGH MOISTURE AND INSTABILITY INTO THE AREA FOR A FEW DOWNPOURS TO DEVELOP OVER THE BIG ISLAND TONIGHT AND SUNDAY...ALONG WITH INCREASING CHANCES OF SHOWERS OVER THE SMALLER ISLANDS. THE TRADES ARE EXPECTED TO RETURN ON TUESDAY AS HIGH PRESSURE BUILDS NORTH OF THE STATE. && .DISCUSSION... INCREASING MOISTURE EMBEDDED IN THE SE FLOW WILL CONTINUE TO MOVE ACROSS THE BIG ISLAND TONIGHT WITH BETTER CHANCES OF RAIN OVER THE SE SLOPES OF MANA LOA AND S PORTIONS OF THE LEEWARD SLOPES. THIS OVERALL SYNOPTIC FLOW IS MAINTAINED IN PART BY AN UPPER LEVEL LOW SEEN IN WATER VAPOR SATELLITE ABOUT 730 MILES SSW OF THE BIG ISLAND. THIS LOW WILL CONTINUE TO GRADUALLY MIGRATE N THROUGH SUN. THE DEEPER MOISTURE AND THE HIGHER INSTABILITY WILL AFFECT MOSTLY THE BIG ISLAND TONIGHT...WITH BEST CHANCES FOR HEAVY SHOWERS OVER THE KAU DISTRICT. THE DEEPER MOISTURE LAYER WILL GRADUALLY SPREAD ACROSS THE SMALLER DURING THE NEXT COUPLE OF DAYS AND BRING INCREASING CLOUD COVER AND SHOWER ACTIVITY. WINDS WILL VEER AND WEAKEN A LITTLE MORE ON SUN WITH POSSIBLE S FLOW ESTABLISHING IN THE AFTERNOON. THERE WILL BE ENOUGH MOISTURE AVAILABLE FOR A ROUND OF AFTERNOON SHOWERS OVER INTERIOR AND N PORTIONS OF THE SMALLER ISLANDS IF THE FLOW WEAKENS ENOUGH. FOR THE REST OF THE WEEK...A MID LVL RIDGE IS SHOWN BY THE MODELS ESTABLISHING RIGHT OVER THE ALOHA STATE BY TUE...WITH SFC HIGH PRESSURE ALSO STRENGTHENING N OF THE ISLAND CHAIN. THIS SYNOPTIC SCENARIO WILL BRING A RETURN OF THE TRADES AND CLEAR OUT THE HAZE AND HUMIDITY...WITH A MORE TYPICAL TRADE WIND SHOWER REGIME ESTABLISHING THROUGH AT LEAST THU. THE TRADES MAY BE DISRUPTED AGAIN LATE THU AS A FRONTAL BOUNDARY MOVES TO THE N OF THE ISLANDS WHILE GRADUALLY DISSIPATING. ANOTHER STRONG HIGH WILL MOVE IN TO THE N OF THE MAIN HAWAIIAN ISLANDS TOWARDS THE FOLLOWING WEEKEND. && .MARINE... MARGINAL SURF ADVISORY CRITERIA CONTINUES WITH THE CURRENT NNW SWELL. A HIGH SURF ADVISORY REMAINS IN EFFECT THROUGH SUN EVENING. THE COMBINATION OF NNW SWELL AND KONA WINDS MEANS STEEP SWELL FOR BOATERS. WINDS WILL REMAIN BELOW SMALL CRAFT ADVISORY /SCA/ LEVELS THROUGH AT LEAST MON...BUT THE THE NNW SWELL AND WIND WAVE ENERGY IS RESULTING IN SEAS OF 10 FEET AT TIMES NEAR KAUAI. THIS SHOULD CONTINUE WITH THE ANOTHER NW PULSE EXPECTED TO ARRIVE SUN...AND WILL ALSO EXPAND INTO ADDITIONAL WINDWARD MARINE ZONES. THEREFORE...THE SCA HAS BEEN UPDATED TO INCLUDE MOST WINDWARD WATERS OF THE REST OF THE ISLANDS. && .HFO WATCHES/WARNINGS/ADVISORIES... HIGH SURF ADVISORY UNTIL 6 PM HST SUNDAY FOR NIIHAU-KAUAI WINDWARD-KAUAI LEEWARD-OAHU NORTH SHORE-OAHU KOOLAU-MOLOKAI-MAUI WINDWARD WEST-MAUI CENTRAL VALLEY-WINDWARD HALEAKALA. SMALL CRAFT ADVISORY UNTIL 6 PM HST SUNDAY FOR KAUAI NORTHWEST WATERS-KAUAI WINDWARD WATERS-KAUAI LEEWARD WATERS-KAUAI CHANNEL- OAHU WINDWARD WATERS-KAIWI CHANNEL-MAUI COUNTY WINDWARD WATERS- ALENUIHAHA CHANNEL-BIG ISLAND WINDWARD WATERS. && $$ REYNES Bulletins, Forecasts and Observations are courtesy of Honolulu National Weather Service Forecast Office |
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