Area Forecast Discussion
Issued by NWS Charleston, WV

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000 FXUS61 KRLX 180221 AFDRLX AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE CHARLESTON WV 921 PM EST WED DEC 17 2014 .SYNOPSIS... LOW LEVEL MOISTURE THINS INTO THURSDAY. HIGH PRESSURE FRIDAY. LOW PRESSURE SYSTEM FOR THE WEEKEND. && .NEAR TERM /THROUGH THURSDAY/...
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920 PM UPDATE...NO SIGNIFICANT CHANGES MADE. PREVIOUS DISCUSSION... AS TEMPERATURES ALOFT GET COLDER...A BIT MORE FAVORABLE FOR LINGERING LIGHT SNOW SHOWERS AND FLURRIES OVER THE MOUNTAINS THE REST OF THE AFTERNOON. THERE ARE "NEVER ANY ALWAYS" IN THIS BUSINESS. DESPITE A PATTERN SIMILAR TO LAST WEEKEND...WITH LOW LEVEL MOISTURE TRAPPED UNDER THE INVERSION...CONCERNED CLOUDS MAY BREAK UP SOONER...ESPECIALLY IN SOUTHERN COUNTIES. MODELS DO NOT SEEM TO BE HANDLING THE THINNING LOW CLOUDS ON SATELLITE IMAGE S OF CRW THIS WEDNESDAY AFTERNOON. THIS LEADS TO MANY DIFFICULTIES FOR TONIGHT. CLOUDS AND THUS TEMPERATURES ARE A MAJOR ISSUE...BUT FOR THE GENERAL PUBLIC IT IS NOT A MEMORABLE SUBJECT. WILL LIKELY GO WITH MORE PARTIAL CLEARING IN SOUTHERN COUNTIES AND A BIT COLDER TONIGHT IN OUR AFTERNOON UPDATE. OF COURSE...EAST OF MOUNTAIN CRESTS...THE USUAL CLEARING IN POCAHONTAS COUNTY TOO. WILL KEEP IT DRY THURSDAY. THOUGH SOME MID LEVEL MOISTURE/CLOUDS INCREASING...COULD BE DETECTED BY RADAR. MID LEVEL TROF AXIS APPROACHES OHIO VALLEY COUNTIES BY 00Z FRIDAY. AS A SIDE NOTE...MADE A FACEBOOK POST TODAY ABOUT THE 25TH ANNIVERSARY OF THE PRE CHRISTMAS COLD WAVE OF DECEMBER 1989.
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&& .SHORT TERM /THURSDAY NIGHT THROUGH SATURDAY/... A SFC LOW PRESSURE SYSTEM WILL MOVE EAST...ACROSS THE SOUTHEASTERN STATES ON SATURDAY. AT THE UPPER LEVELS...MODELS BRING CONSIDERABLE FORCING IN FORM OF A OPEN WAVE AT H500 AND ASSOCIATED VORTICITY MAXIMA PASSING JUST SOUTH OF THE AREA ACROSS TN...KY AND VA. THE INFLUENCE OF THIS SYSTEM COULD AFFECT WV SATURDAY AND SATURDAY NIGHT WITH A WINTRY MIX PRECIPITATION. FREEZING RAIN...SLEET...RAIN AND/OR SNOW COULD BE POSSIBLE. THE ECMWF HAS TRENDED FURTHER SOUTH AND EAST WITH THIS SYSTEM...WHILE THE GFS...CMC...AND ESPECIALLY THE NAM BRING PERIODS OF PCPN IN THEIR QPF FIELDS OVER THE WV AND VA. DECIDED TO KEEP LIKELY TO CATEGORICAL POPS WITH THIS SYSTEM PER PERSISTENCE AMONG THE MODEL CONSENSUS. CONFIDENCE AT THIS TIME IS LOW...AND CHANGES TO THE FORECAST MIGHT BE POSSIBLE DURING THE UPCOMING DAYS. && .LONG TERM /SATURDAY NIGHT THROUGH WEDNESDAY/... GRADUAL DRYING TREND SUNDAY AS LOW PRESSURE SYSTEM AND UPPER SHORTWAVE TROUGH PUSHES OFF TO THE EAST. WARMER WEATHER WILL THEN TAKE HOLD SUNDAY INTO MONDAY AS HEIGHTS BUILD OUT AHEAD OF NEXT APPROACHING SYSTEM. ALTHOUGH MAINLY DRY MONDAY...COULD SEE SOME LIGHT PRECIPITATION ACROSS PARTS OF THE MOUNTAINS AS ANOTHER LOW MOVES NORTHEAST ALONG THE COAST. ECMWF AND GFS TAKE COMPLETELY DIFFERENT PATHS WITH THIS LOW...BUT AT THIS POINT...LOOKS LIKE ANY MAJOR EFFECTS WITH THIS LOW WILL REMAIN OUTSIDE OF THE AREA. FOCUS THEN SHIFTS TO A STRONG SYSTEM ACROSS THE UPPER MID WEST...THAT WILL SPREAD PRECIPITATION...AND A COLD FRONT BACK INTO THE AREA LONG ABOUT TUESDAY/TUESDAY NIGHT...AND LAST INTO AT LEAST THURSDAY...WHEN THE LOW WILL FINALLY PULL OFF TO THE NORTHEAST. PRECIPITATION SHOULD START OUT AS MOSTLY RAIN...EXCEPT ACROSS HIGHER TERRAIN...ON TUESDAY...BEFORE TRANSITIONING TO MOSTLY SNOW TUESDAY NIGHT...THEN AGAIN WEDNESDAY NIGHT. ALONG WITH THE WINTRY PRECIPITATION...GUSTY WINDS ARE EXPECTED ON WEDNESDAY INTO THURSDAY. WINTER WEATHER HEADLINES MAY BE NECESSARY DURING THIS PERIOD. && .AVIATION /03Z THURSDAY THROUGH MONDAY/...
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LOW LEVEL MOISTURE ERODING ACROSS THE SOUTH AS HIGH PRESSURE NOSES IN. SOME QUESTION ON JUST HOW FAR NORTH THIS DRIER AIR WILL MAKE IT...SO SOME UNCERTAINTY ON WHEN WE MAY BREAK OUT OF MVFR AT SITES SUCH AS HTS AND CRW. MODELS SHOW LOW LEVEL MOISTURE HANGING TOUGH AT HTS AND CRW...BUT THEY SEEM TO BE TOO PESSIMISTIC BASED ON WHATS HAPPENING IN EASTERN KY. NORTHWEST FLOW REMAINS...SO MAY ALSO FILL BACK IN AT BKW OVERNIGHT. OTHERWISE EXPECT MVFR TO REMAIN THROUGH THE NIGHT ACROSS THE NORTH...AND MUCH OF TOMORROW AT CKB AND EKN. WINDS WILL GENERALLY REMAIN FAIRLY LIGHT OUT OF THE W AND NW THROUGH THE TAF PERIOD. FORECAST CONFIDENCE AND ALTERNATE SCENARIOS THROUGH 00Z FRIDAY... FORECAST CONFIDENCE: MEDIUM. ALTERNATE SCENARIOS: MORE CLEARING COULD OCCUR THAN EXPECTED TONIGHT ACROSS SOUTHERN CWA. EXPERIMENTAL TABLE OF FLIGHT CATEGORY OBJECTIVELY SHOWS CONSISTENCY OF WFO FORECAST TO AVAILABLE MODEL INFORMATION: H = HIGH: TAF CONSISTENT WITH ALL MODELS OR ALL BUT ONE MODEL. M = MEDIUM: TAF HAS VARYING LEVEL OF CONSISTENCY WITH MODELS. L = LOW: TAF INCONSISTENT WITH ALL MODELS OR ALL BUT ONE MODEL. DATE THU 12/18/14 UTC 1HRLY 02 03 04 05 06 07 08 09 10 11 12 13 EST 1HRLY 21 22 23 00 01 02 03 04 05 06 07 08 CRW CONSISTENCY H H H H H H M M M M M M HTS CONSISTENCY H H H H H H M M M M M M BKW CONSISTENCY M M M M M M M H M M M M EKN CONSISTENCY H H H H H H H H M M M M PKB CONSISTENCY H H H H H H M M M M M M CKB CONSISTENCY H H H H H H M M M M M M AFTER 00Z FRIDAY... IFR POSSIBLE IN WINTRY MIX SATURDAY INTO SUNDAY.
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&& .RLX WATCHES/WARNINGS/ADVISORIES... WV...NONE. OH...NONE. KY...NONE. VA...NONE. && $$ SYNOPSIS...KTB/ARJ/SL NEAR TERM...KTB/MZ SHORT TERM...ARJ LONG TERM...SL AVIATION...MZ

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