Area Forecast Discussion
Issued by NWS Wakefield, VA

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000 FXUS61 KAKQ 281743 AFDAKQ AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE WAKEFIELD VA 143 PM EDT THU MAY 28 2015 .SYNOPSIS... HIGH PRESSURE REMAINS ANCHORED WELL OFF THE MID ATLANTIC COAST THIS AFTERNOON...WITH A TROUGH OF LOW PRESSURE NEARLY STATIONARY EAST OF THE MOUNTAINS. HIGH PRESSURE WILL BUILD OVER THE NORTHEAST STATES FRIDAY...THEN SLIDE OFF THE COAST SATURDAY. A SLOW MOVING COLD FRONT WILL ENTER THE LOCAL AREA FROM THE NORTHWEST ON SUNDAY. && .NEAR TERM /UNTIL 6 PM THIS EVENING/... FA GENLY SPLIT WRT CONDS ATTM. FAIR AMT OF SUNSHINE ACRS WRN 1/2...WHILE BAND OF BKN-OVC CLDNS EXTENDS FM THE LWR MD ERN SHORE SSW THROUGH INTERIOR SE VA/NE NC. ISOLD SHRAS HAVE OCCURRED IN THAT CORRIDOR SO FAR THIS MRNG. THE REST OF THE DAY WILL HAVE P-MSTLY SUNNY CONDS W...AND VRB CLDS-PCLDY E. PRIME AREA FOR CONVECTION XPCD TO BE ACRS INTERIOR SE VA AND NE NC WHERE LINGERING CONVECTIVE BOUNDARIES FM LAST EVE STMS COMBINE W/ DIFFERENTIAL HTG AND SEABREEZES. CARRYING 30-50% POPS IN THOSE AREAS. ELSW...AMT/COVERAGE OF CONVECTION UNCERTAIN...AND WILL HAVE MNLY 15-30% POPS. WEAK SHEAR WILL MAKE ORGANIZED STRONG STMS UNLIKELY...MAIN CONCERN WILL BE LCLLY HVY RA IN SLO MOVING STMS DUE TO WEAK FLOW AND PWATS OVER 1.50". HI TEMPS FM 85-90F...EXCEPT 70S TO L80S AT THE CST (LIKE WED AFTN...OCEAN CITY MD BEACHES MAY NOT HAVE A HI TEMP ABV 70F). && .SHORT TERM /6 PM THIS EVENING THROUGH SATURDAY/... LOW CHC POPS LINGER THIS EVENING...MAINLY WELL INLAND...OTHERWISE PARTLY CLOUDY WITH LOWS MAINLY FROM 65-70 F. WK SFC HI PRES SLIDES E ACRS NEW ENG FRI. MDLS SHOW A SLGT DROP IN DEWPTS ACRS FAR NNE COUNTIES FOR THE DAY...WHILE RMNG UP ELSW. HI PRES JUST OFFSHORE BEGINS TO SLGTLY BUILD WWD DURING THE DAY...SO FOCUS OF HIGHER POPS (30-40%) NW 1/2 OF FA WITH ONLY 10-20% POPS ELSW. BY SAT...CDFNT FM THE NW APPROACHES...THOUGH RMNS FAR ENOUGH AWAY FOR SIGNIFICANT IMPACT ON THE WX HERE. WILL KEEP CONDS WARM W/ VRB CLDS/PCLDY AND MAINLY JUST ABOUT A 20% POP INLAND...10% AT THE CST. HI TEMPS FRI A TAD COOLER MAINLY IN THE MID TO UPPER 80S INLAND...70S AT THE CST. LO TEMPS M60S- ARND 70F. SAT A LITTLE WARMER WITH HIGHS UPPER 80S/NEAR 90 F INLAND TO THE 70S TO LWR 80S AT THE COAST. && .LONG TERM /SATURDAY NIGHT THROUGH WEDNESDAY/... THE MEDIUM RANGE PERIOD REMAINS CHARACTERIZED BY MID/UPPER LEVEL RIDGING OVER THE ERN CONUS WITH A TROUGH LINGERING OVER THE INTERMOUTAIN WEST. SURFACE HIGH PRESSURE BUILDS ACROSS ERN CANADA SATURDAY NIGHT AND SUNDAY PUSHING A COLD FRONT INTO THE NRN MID ATLANTIC. 12Z GFS/ECMWF DIVERGE SUNDAY NIGHT/MONDAY WITH THE GFS BRINGING THE SURFACE COLD FRONT THROUGH THE LOCAL AREA SUNDAY NIGHT AND THE ECMWF WAITING UNTIL MONDAY. HIGH PRESSURE SETTLES IN VICINITY OF THE NEW ENGLAND COAST TUESDAY AND WEDNESDAY...AND MOVES OFFSHORE THURSDAY. THE BEST FOCUS FOR CONVECTION APPEARS TO BE SUNDAY AFTERNOON/EVENING AHEAD OF THE COLD FRONT WITH 40-50% POPS FORECAST ACROSS THE NRN HALF OF THE AREA. THE WIND PROFILE WILL REMAIN WEAKLY SHEARED SO ANY THUNDERSTORMS SHOULD BE RATHER UNORGANIZED. POPS MONDAY AFTERNOON AND EVENING ARE FORECAST TO BE 30-40% MONDAY AFTERNOON/EVENING...AND THEN TREND DOWNWARD TO 20-30% BY TUESDAY AND SUB-15% THROUGH MIDWEEK AS SURFACE HIGH PRESSURE PREVAILS. HIGH TEMPERATURES SUNDAY ARE FORECAST TO RANGE FROM THE MID TO UPPER 80S...WITH UPPER 70S TO LOW 80S BEHIND THE FRONT TUESDAY THROUGH THURSDAY. LOWS SHOULD AVERAGE THROUGH THE 60S. && .AVIATION /18Z THURSDAY THROUGH TUESDAY/...
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VFR TO START OFF THE 18Z TAF PERIOD. STAGNANT WX PATTERN OF LAST FEW DAYS CONTINUES TDA WITH SFC HI PRES OFFSHORE AND LO PRES WELL W OF THE MID ATLC. S WINDS AT 5-10 KT WILL CONTINUE THRU SUNSET BETWEEN THESE TWO FEATURES...BEFORE DIMINISHING AFTER DARK. SHRAS/TSTMS ARE PSBL AT ALL TAF SITES LATER THIS AFTN/EVENG...BUT CHANCE IS NOT HI ENUF TO INCLUDE IN THE TAFS ATTM. PATCHY FOG/STRATUS IS PSBL OVER AREAS THAT RECEIVE RAINFALL...BUT VFR CONDS SHOULD PREVAIL AT THE TAF SITES TNGT. UPPER/SFC HIGH PRESSURE REMAINS OVER THE REGION INTO THE WEEKEND. DRY CONDITIONS ARE EXPECTED TO PREVAIL...BUT THERE IS A CHANCE FOR DIURNALLY DRIVEN SHOWERS/THUNDERSTORMS ACROSS THE PIEDMONT FRI- SAT. BETTER CHANCES FOR PRECIP EXPECTED SUN-MON AS A COLD FRONT REACHES...AND THEN STALLS OVER THE REGION.
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&& .MARINE... HIGH PRESSURE REMAINS CENTERED WELL OFF THE MID-ATLANTIC COAST EARLY THIS MORNING WITH A WEAK SFC TROUGH JUST WEST OF THE WATER. THE RESULT IS A SW WIND OF 10-15 KT. WAVES HAVE SUBSIDED TO GENERALLY 1 TO 2 FT WITH SEAS RUNNING 2 TO 4 FT (HIGHEST IN THE NRN COASTAL WATERS). HIGH PRESSURE PUSHES FARTHER OFFSHORE TODAY AS A WEAK COLD FRONT DROPS INTO THE REGION...WASHING OUT WEST OF THE WATERS THIS AFTERNOON. FLOW BECOMES SELY THIS AFTERNOON...AVERAGING 10-15 KT. SELY FLOW AOB 10 KT PERSISTS FRI. GRADIENT STRENGTHENS FRI NIGHT-SAT AS A COLD FRONT APPROACHES FROM THE WEST. SPEEDS REMAIN SUB-SCA. SEAS BUILD TO 3-4 FT FRI NIGHT-SAT THANKS TO PERSISTENT AND INCREASING SE FLOW. COLD FRONT REACHES...AND THEN STALLS OVER THE REGION SUN INTO EARLY NEXT WEEK. && .AKQ WATCHES/WARNINGS/ADVISORIES... MD...NONE. NC...NONE. VA...NONE. MARINE...NONE. && $$ SYNOPSIS...ALB/LKB NEAR TERM...ALB/LKB SHORT TERM...ALB/LKB LONG TERM...AJZ AVIATION...MAS MARINE...SAM

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