Area Forecast Discussion
Issued by NWS Wilmington, NC

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000 FXUS62 KILM 150712 AFDILM AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE WILMINGTON NC 312 AM EDT MON SEP 15 2014 .SYNOPSIS... A FRONT STALLED ACROSS SOUTHERN GEORGIA WILL RETURN NORTH TODAY...ONLY TO BE PUSHED SOUTH AGAIN TUESDAY AS HIGH PRESSURE BUILDS EASTWARD ACROSS THE PLAINS STATES. THIS HIGH WILL MOVE ACROSS THE MID-ATLANTIC STATES LATE IN THE WEEK...PROVIDING FALL- LIKE WEATHER WEDNESDAY THROUGH SUNDAY. && .NEAR TERM /UNTIL 6 AM THIS MORNING/... AS OF 730 PM SUNDAY...IT CERTAINLY FEELS LIKE THE BEGINNING OF FALL. A FEW MINUTES RECENTLY SPENT OUT IN THE NWS OFFICE PARKING LOT REVEALS LOW CLOUDS...A COOL NE BREEZE...AND THE FREQUENT CHIRPS OF MIGRATING WARBLERS OVERHEAD. THE LATEST FORECAST UPDATE REMAINS IN GOOD SHAPE AND NO SIGNIFICANT CHANGES ARE PLANNED. I DID ADD SOME PATCHY DRIZZLE AS SURFACE RELATIVE HUMIDITY CLIMBS BEYOND 90 PERCENT AND CLOUD BASES FALL BELOW 1500 FEET OVERNIGHT. PREVIOUS DISCUSSION FROM 730 PM FOLLOWS... CLOUDS WILL PERSIST THROUGH THE NIGHT AS MOISTURE CONTINUES THROUGHOUT THE 1500-7000 FOOT LAYER. WEAK WARM ADVECTION EXTENDING DOWN AS LOW AS 925 MB LATE WILL CREATE TRANSITORY PATCHES OF ISENTROPIC LIFT ALONG THE 300K THETA SURFACE WITH PATCHY LIGHT RAIN OR SHOWERS POSSIBLE...MAINLY LATE FOR AREAS NORTH OF THE SANTEE RIVER. BESIDES LOWERING POPS BEFORE MIDNIGHT FOR ALL AREAS MOST OTHER CHANGES TO THE FORECAST WERE MINOR. PREVIOUS DISCUSSION FROM 300 PM FOLLOWS... NE SURGE ON THE LEADING EDGE OF CANADIAN HIGH PRESSURE HAS BROUGHT LOW-LEVEL COOLING AND SUBSTANTIALLY LOWERED DEWPOINT VALUES ACROSS THE AREA WHILE STABILIZING A COLUMN FROM THE GROUND FLOOR...STILL CHALKED FULL OF VAPOR CONTENT PER LATEST SATELLITE DERIVED PWAT SCANS. OVER- RUNNING AND WEAK WAVES OF ISENTROPIC OMEGA WILL LIKELY BRING -RA/-DZ OR ISOLATED SHOWERS OVERNIGHT TO THE AREA BUT NO REAL FLOOD THREAT APPEARS TO EXIST DESPITE VERY WET GROUND AND A WET AIR MASS. CLOUDS ARE EXPECTED TO REMAIN PLENTIFUL OVERNIGHT IN THIS REGIME AND TIME HEIGHT DEPICTIONS SHOW MID-LEVEL DRYING LATE TONIGHT WILL FURTHER LOWER THE PROBABILITIES OF DEEP CONVECTION FOR LARGE RAINFALL ACCUMULATIONS...THUS PRIMARILY LIGHT PRECIPITATION THROUGH DAYBREAK MONDAY AND LOW-END CHANCES. HIGHEST POP VALUES TO RESIDE EXTREME SOUTH AND OFFSHORE. MIN TEMPS WITH CLOUD COVER AND COOL AIR ADVECTION SHOULD YIELD LOW TO MIDDLE 60S ACROSS MOST OF THE FORECAST AREA WITH UPPER 60S TO NEAR 70 CLOSER TO THE SEA. && .SHORT TERM /6 AM TUESDAY MORNING THROUGH WEDNESDAY NIGHT/... AS OF 3 AM MONDAY...MID LEVEL RIDGING WILL SHARPEN AND MOVE ACROSS THE WEST COAST AS TROUGHING DEVELOPS ACROSS THE EASTERN THIRD OF THE U.S. THIS TROUGH WILL EVENTUALLY PUSH A COLD FRONT THROUGH THE AREA LATE TUESDAY INTO EARLY WEDNESDAY. WILL MAINTAIN A GOOD CHANCE OF SHOWERS AND THUNDERSTORMS FOR TUESDAY AS THE LINGERING MOISTURE WARRANTS AHEAD OF THE FRONT. MORE OF A SHOWERY SCENARIO FOR WEDNESDAY ESPECIALLY ACROSS NORTH CAROLINA. STILL ENOUGH INSTABILITY TO WARRANT SLIGHT CHANCE OF THUNDER NORTH WITH THUNDERSTORMS THE PRIMARY MODE FOR SOUTH CAROLINA. TEMPERATURES STILL ON THE WARM SIDE FOR TUESDAY IN THE MIDDLE 80S DROPPING A GOOD FIVE TO TEN DEGREES WEDNESDAY. OVERNIGHT LOWS WILL BE IN THE 60S. && .LONG TERM /THURSDAY THROUGH SUNDAY/... AS OF 3 AM MONDAY...THE EXTENDED FORECAST CONTINUES TO SHOW A MOSTLY ZONAL MID LEVEL PATTERN INITIALLY WITH MORE AMPLITUDE DEVELOPING LATE. THE WESTERLIES WILL SHOW CONFLUENCE ACROSS THE CENTRAL PLAINS/GREAT LAKES WHICH WILL ALLOW A RATHER EXPANSIVE AREA OF SURFACE HIGH PRESSURE TO BUILD DOWN THE EAST COAST. THIS WILL MAINTAIN A SOMEWHAT DRY AND COOL FLOW ACROSS OUR FORECAST AREA. THE HIGH WEAKENS AS MID LEVEL SUPPORT WANES AND HIGH PRESSURE BUILDS ACROSS THE WESTERN U.S. AT THE MID LEVELS. THIS WILL SET THE STAGE FOR ANOTHER SYSTEM TO AFFECT THE AREA LATE OR JUST BEYOND THIS FORECAST PERIOD. TEMPERATURES WILL BE JUST A LITTLE BELOW CLIMATOLOGY MODERATING EVER SO SLIGHTLY LATE IN THE PERIOD. THE ONLY POPS ARE RELEGATED TO JUST OFFSHORE WHERE JUST ENOUGH MOISTURE WARRANTS. && .AVIATION /07Z MONDAY THROUGH FRIDAY/... AS OF 06Z...MVFR CIGS 1-2KFT WILL PREVAIL OVERNIGHT WITH THE ILM SC TERMINALS POSSIBLY OBSERVING CIGS LESS THAN 1K FT IN A 3-5 HR WINDOW SURROUNDING DAYBREAK MON DUE TO THEIR CLOSER PROXIMITY TO THE STALLED COLD FRONT SOUTH OF THE AREA. CANNOT RULE OUT TEMPO IFR CIGS AT KILM AND ESPECIALLY KLBT...AND MAY INCLUDE A SUB 2K FOOT CEILING AT LBT AT PRESS TIME. FOG DOES NOT SEEM LIKE A BIG CONCERN GIVEN THE PERSISTENT NORTHEAST FLOW AND EXTENSIVE CLOUD COVER...BUT WE COULD SEE SOME MVFR VSBYS INLAND. GUIDANCE SUGGESTS FOG MAY BECOME A PLAYER TOWARD DAYBREAK ACROSS THE INLAND TERMINALS...DROPPING VSBYS BELOW 1SM. FOR NOW WILL KEEP THE LOW STRATUS DECK AS THE MAJOR PLAYER FOR ANY IFR CONDITIONS. LIGHT NORTH TO NORTHEAST WINDS AT THE START WILL VEER TO THE EAST AND SOUTHEAST LATER IN THE DAY. HAVE ADDED VCSH FOR THE SOUTHERN TERMS AFTER 20Z AS THE WASHED OUT BOUNDARY LIFTS BACK NORTHWARD ACROSS OUR CWA. EXTENDED OUTLOOK...CHANCE OF SHOWERS/TEMPO MVFR TUE AHEAD OF A COLD FRONT. POST-FRONTAL MVFR CIGS MAY DEVELOP WED AS COOLER AIR WEDGES INTO THE REGION. OTHERWISE EXPECT VFR THROUGH FRI. && .MARINE... NEAR TERM /THROUGH TONIGHT/... AS OF 1030 PM SUNDAY...WIND SPEEDS AND SEAS ARE SIMILAR TO WHAT WAS OBSERVED THREE HOURS AGO. THIS LATEST FORECAST UPDATE DELAYS THE IMPROVING TREND BY A FEW HOURS BUT OTHERWISE TRENDS ARE INTACT. PREVIOUS DISCUSSION FROM 730 PM FOLLOWS... THE NE SURGE IS ON ITS LAST LEGS WITH RECENT GUSTS STILL REPORTED AS HIGH AS 14 KNOTS AT BALD HEAD ISLAND AND 19 KNOTS AT THE OFFSHORE LEJEUNE BUOY. I HAVE ADJUSTED SEAS UPWARD BY ABOUT A FOOT THROUGH MIDNIGHT FOR AREAS NEAR AND EAST OF CAPE FEAR BASED ON BUOY OBSERVATIONS...OTHERWISE NO SIGNIFICANT CHANGES. PREVIOUS DISCUSSION FROM 300 PM FOLLOWS... NE WIND-SPEEDS SHOULD ABATE SEVERAL KNOTS AS THE SURGE PLAYS OUT BUT COUNT ON 15 KT OF WIND OVERNIGHT POSSIBLY GOING MORE TO THE N INTO EARLY MONDAY. SEAS MAINLY 2-3 FEET EXCEPT 3-4 FT NORTH OF CAPE FEAR. SEAS A MIX OF ENE WAVES 2-2.5 FT EVERY 4-5 SECONDS AND SE WAVES 1-1.5 FT EVERY 8 SECONDS. PATCHY DRIZZLE AND MIST COULD LIMIT VSBYS EARLY MONDAY...ESPECIALLY NC WATERS. NO ADVISORIES OR CAUTION STATEMENTS ARE NEEDED FOR TONIGHT. SHORT TERM /TUESDAY THROUGH WEDNESDAY NIGHT/... AS OF 3 AM MONDAY...LIGHT WIND FIELDS WILL PREVAIL OVER THE WATERS FOR MOST OF TUESDAY. IF ANYTHING...WINDS WILL HAVE A NORTHERLY COMPONENT OF TEN KNOTS OR LESS. THE WINDS ACQUIRE MORE DEFINITION BY WEDNESDAY MORNING AS A FRONT MOVES SLOWLY TO THE SOUTH. EXPECT AN INCREASING NORTHEASTERLY FLOW OF 10-15 KNOTS. SIGNIFICANT SEAS INCREASE FROM 2-3 FEET TO 3-5 FEET AND POSSIBLY SOME SIX FOOTERS ACROSS THE OUTER WATERS WEDNESDAY. LONG TERM /THURSDAY THROUGH FRIDAY/... AS OF 3 AM MONDAY...ESSENTIALLY A NORTHEAST FLOW THROUGH THE PERIOD. THE STRONGEST WINDS WILL OCCUR LATE AS HIGH PRESSURE...ANCHORED ACROSS THE NORTHEAST STRENGTHENS. SPEEDS WILL BE IN A 15-20 KNOT RANGE CLOSER TO AND POSSIBLY JUST EXCEEDING THE HIGHER END BY FRIDAY MORNING. SEAS WILL HOVER AT OR JUST BELOW SMALL CRAFT CRITERIA...3-5 FEET. && .ILM WATCHES/WARNINGS/ADVISORIES... SC...NONE. NC...NONE. MARINE...NONE. && $$ SYNOPSIS...SHK NEAR TERM...TRA SHORT TERM...SHK LONG TERM...SHK AVIATION...DCH/BJR

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