| Current Conditions | ||
| Temp |  | 6.7 C |
| RH | | 14 % |
| Wind | | ESE 20 mph |
| Road | | Open |
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Hawaiian Islands Synoptic Discussion and Guidance 735 FXHW60 PHFO 192019 AFDHFO AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE HONOLULU HI 1019 AM HST SAT APR 19 2014 .SYNOPSIS... BREEZY TRADE WINDS WILL CONTINUE THROUGH THE WEEK WITH SHOWERS FOCUSING OVER THE WINDWARD SLOPES. LEEWARD AREAS OF THE SMALLER ISLANDS WILL SEE A FEW SHOWERS IN THE EARLY MORNING AND LATE AFTERNOON. && .DISCUSSION... HIGH PRESSURE NORTH OF THE STATE IS PROVIDING STEADY TRADE WINDS ACROSS THE ISLANDS TODAY. WINDWARD SHOWERS ARE BRINGING CLOUDS AND LIGHT RAINFALL ALONG THE WINDWARD SLOPES. TRADE WINDS WILL CONTINUE THROUGH THE FORECAST PERIOD WITH AN UPTICK IN WINDS AND SHOWERS EXPECTED SUNDAY THROUGH TUESDAY. HIGH PRESSURE MOVING IN FROM THE WEST WILL BUILD NORTH OF HAWAII TONIGHT AND SUNDAY. THE PRESSURE GRADIENT WILL TIGHTEN FROM N TO S ACROSS THE AREA AS THE HIGH BUILDS...AND WINDS WILL INCREASE IN RESPONSE. A WIND ADVISORY MAY BE NECESSARY ACROSS THE WINDIER AREAS OF THE BIG ISLAND AND MAUI COUNTY SUNDAY AS THE WINDS INCREASE. TUESDAY...THE HIGH WILL PUSH TOWARD THE EAST PACIFIC AS A WEAK FRONT MOVES ACROSS THE DATELINE. WINDS OVER THE STATE WILL DECREASE TO MODERATE TRADES AS THE HIGH MOVES INTO THE EAST PACIFIC FOR THE SECOND HALF OF THE WEEK. CURRENT PRECIPITABLE WATER VALUES ARE BELOW NORMAL NEAR THE ISLANDS AND SHOWERS HAVE BEEN LIMITED. THE MIMIC PRECIP WATER FIELD SHOWS AN INCREASE IN MOISTURE UPSTREAM OF THE ISLANDS NEAR 150W AND 24N. THIS MOISTURE IS EXPECTED TO INCREASE WINDWARD SHOWERS TONIGHT THROUGH TUESDAY NIGHT AS THE MOISTURE MOVES ACROSS THE AREA. && .AVIATION... TRADE WIND FLOW CONTINUES...RESULTING IN AIRMET TANGO FOR TURBULENCE TO THE LEE OF THE ALL ISLANDS. TRADES ARE EXPECTED TO INCREASE THROUGH THE WEEKEND...SO EXPECTING THE AIRMET TO CONTINUE. CLOUDS AND SHOWERS BEING CARRIED IN ON THE TRADES WILL BRING MVFR CONDITIONS MAINLY TO WINDWARD AND MAUKA AREAS FROM TIME TO TIME...AND ISOLATED IFR CONDITIONS ARE POSSIBLE. OTHERWISE VFR CONDITIONS ARE EXPECTED TO PREVAIL OVER LEEWARD AREAS. && .MARINE... THE SMALL CRAFT ADVISORY COVERS ALL HAWAIIAN COASTAL WATERS DUE TO SEAS AND WINDS. WINDS SHOULD ONLY INCREASE FURTHER WITH TIME AS HIGH PRESSURE BUILDS TO OUR NORTH...AND THE SCA EXTENDS THROUGH MONDAY. WINDS MAY REACH NEAR GALE FORCE AT TIMES SUNDAY THROUGH MONDAY IN THE ALENUIHAHA CHANNEL. A SMALL TO MODERATE NORTHWEST SWELL WILL BUILD LATER TODAY AND TONIGHT...THEN DECLINE SUNDAY EVENING. ANOTHER MODERATE NORTHWEST SWELL IS EXPECTED NEXT WEDNESDAY NIGHT AND WILL CONTINUE THROUGH THE END OF NEXT WEEK. STRENGTHENING TRADE WINDS WILL PRODUCE SHORT PERIOD...CHOPPY SURF ALONG EAST FACING SHORES...LIKELY REACHING ADVISORY LEVELS ON EAST FACING SHORES BY LATE SUNDAY OR MONDAY. && .HFO WATCHES/WARNINGS/ADVISORIES... SMALL CRAFT ADVISORY UNTIL 6 PM HST MONDAY FOR ALL HAWAIIAN WATERS- && $$ MORRISON...DISCUSSION/MARINE M BALLARD...AVIATION Bulletins, Forecasts and Observations are courtesy of Honolulu National Weather Service Forecast Office |
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