| Current Conditions | ||
| Temp |  | 1.7 C |
| RH | | 30 % |
| Wind | | NE 12 mph |
| Road | | Open |
|
Menu of Text Products for the Hawaiian Islands and the Tropical Pacific/Atlantic Oceans: |
|
Narrow the Menu List Select Time Limit: 12 hours | 24 hours | 48 hours | 72 hours | No time limit Select Product Type: All | Routine Bulletins/FCSTS | Warnings/Watches/Advisories | HAWN Weather | Tropical | Marine | Aviation | Daily Obs | Special |
|
|
Hawaiian Islands Synoptic Discussion and Guidance 153 FXHW60 PHFO 071347 AFDHFO AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE HONOLULU HI 400 AM HST SAT NOV 7 2009 .SYNOPSIS... HIGH PRESSURE TO THE NORTH OF THE ISLANDS WILL CONTINUE TO BRING MODERATE TRADE WINDS TO THE AREA INTO NEXT WEEK. MOISTURE UPSTREAM OF THE ISLANDS WILL BRING WET TRADE SHOWERS TO THE ISLANDS OVER THE WEEKEND...AND THE MODERATE TRADES WILL HELP TO BRING SOME OF THESE SHOWERS TO LEEWARD AREAS. HIGH CLOUDS WILL PERSIST THROUGH THE WEEKEND. && .DISCUSSION... NO BIG CHANGES IN THE FORECAST FOR THIS MORNING. THE HIGH PRESSURE NORTH OF THE ISLANDS WILL CONTINUE TO BRING MODERATE TRADES TO THE AREA TODAY. THE MODELS REMAIN IN GOOD AGREEMENT WITH THIS FEATURE. OVERNIGHT WE SAW A BAND OF LOW LEVEL MOISTURE MOVE OVER THE WINDWARD SIDES OF THE ISLANDS...BEING CARRIED IN ON THE TRADE WINDS. SEVERAL GAGES ON KAUAI AND OAHU REPORTED RAINFALL AROUND A QUARTER OF AN INCH. THE MOST RAIN BETWEEN 8PM AND 2AM WAS REPORTED AT MANOA LYON ARBORETUM ON OAHU WHICH REPORT 0.41 INCHES. PORTIONS OF THE BAND ARE STILL OFFSHORE...SO ANTICIPATE MORE RAINFALL IN THE PRE-DAWN HOURS. UPPER LEVEL CLOUDS CONTINUE TO STREAM OVER THE ISLANDS FROM THE WEST DUE TO A UPPER LEVEL LOW WEST NORTHWEST OF THE ISLANDS. THE MODELS ARE IN GOOD AGREEMENT WITH THIS UPPER LOW STAYING TO THE WEST THROUGH THE WEEKEND...SO EXPECT THE HIGH CLOUDS TO COME AND GO THROUGHOUT. OVER THE WEEKEND THE MODELS SHOW THE LOW WEAKENING INTO AN UPPER LEVEL TROUGH THAT WILL APPROACH KAUAI SUNDAY NIGHT. THE TROUGH WILL BRING SOME UNSTABLE AIR TO THE ISLANDS...WHICH WILL LIKELY INCREASE THE SHOWER ACTIVITY OVER THE AREA. HEADING INTO THE MIDDLE OF THE WEEK...THE MODELS SHOW A STRONGER UPPER LEVEL TROUGH MOVING OVER THE ISLANDS FROM THE NORTH. THE LATEST RUNS OF THE MODELS HAVE A BIT MORE AGREEMENT WITH THE PLACEMENT OF AN UPPER LEVEL LOW THAT WOULD DEVELOP OVER THE ISLANDS. THE ECMWF...GFS AND NOGAPS NOW ALL HAVE THE LOW FORMING OVER THE ISLANDS WEDNESDAY AFTERNOON AND OVERNIGHT. THERE REMAINS SOME DISCREPANCY OVER THE STRENGTH OF THE UPPER LOW...WITH THE NOGAPS BEING THE STRONGEST...WHILE THE ECMWF AND GFS ARE MORE IN LINE WITH EACH OTHER. HAVE LEFT THE GRIDS IN THE LONG TERM WITH THE WET TRADE PATTERN WHILE AWAITING ANOTHER RUN OR TWO OF THE MODELS TO SEE IF THIS TREND CONTINUES. && .MARINE... A SMALL CRAFT ADVISORY CONTINUES FOR COASTAL AREAS AROUND KAUAI DUE TO COMBINED SEAS...AND AROUND THE WINDIER AREAS NEAR THE BIG ISLAND AND MAUI FOR WINDS. DESPITE A NEW NORTH NORTHWEST SWELL...SURF IS EXPECTED TO REMAIN BELOW ADVISORY LEVELS FOR THE REST OF THE WEEKEND. && .HFO WATCHES/WARNINGS/ADVISORIES... SMALL CRAFT ADVISORY UNTIL NOON HST SATURDAY FOR KAUAI WINDWARD WATERS-KAUAI LEEWARD WATERS-OAHU WINDWARD WATERS-KAIWI CHANNEL- MAUI COUNTY WINDWARD WATERS-BIG ISLAND LEEWARD WATERS. SMALL CRAFT ADVISORY UNTIL 6 AM HST SUNDAY FOR KAUAI NORTHWEST WATERS-KAUAI CHANNEL-MAALAEA BAY-PAILOLO CHANNEL-ALENUIHAHA CHANNEL-BIG ISLAND SOUTHEAST WATERS. && $$ Bulletins, Forecasts and Observations are courtesy of Honolulu National Weather Service Forecast Office |
|