Area Forecast Discussion
Issued by NWS Charleston, WV

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000 FXUS61 KRLX 272354 AFDRLX AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE CHARLESTON WV 754 PM EDT WED AUG 27 2014 .SYNOPSIS... WEAK COLD FRONT CROSSES THIS AFTERNOON INTO TONIGHT. WEAK HIGH PRESSURE DOMINATES THURSDAY AND FRIDAY. HOT AND MORE HUMID SATURDAY. DEEPER MOISTURE SUNDAY ASSOCIATED WITH DISTURBANCE ALOFT. && .NEAR TERM /THROUGH THURSDAY/... MUCH OF THE SHRA/TSRA FOCUSED ACROSS THE N LOWLANDS AND EXPECT THIS TO CONTINUE NEXT FEW HRS...SLIDING INTO N MTNS. ELSEWHERE...HAVE JUST ISOLATED SHRA/TSRA THIS EVE. KEEP SCHC POPS IN THRU MORNING WITH THE FRONT AS IT SAGS SE. EXPECT AREAS OF DENSE FOG WHERE IT HAS RAINED. ALSO THINK SOME LOW STRATUS WILL FORM LATE ACROSS C AND S ZONES. THIS WILL SCT OUT BY MID MORNING. KEPT AREA POP FREE TOMORROW PER LATEST HI RES MODELS AS THE FRONT CONTINUES SAGGING S INTO TN VALLEY/NC. PREVIOUS DISCUSSION BELOW... WEAK COLD FRONT AT 16Z ENTERING SOUTHEAST OHIO ZONES...WITH CONVECTION FIRING ALONG THE FRONT IN THE AFTERNOON HEATING. FRONTAL BOUNDARY WILL SLOWLY SINK SOUTH ACROSS THE AREA THIS EVENING AND TONIGHT...ENDING UP ACROSS THE SOUTHERN ZONES BY 12Z THURSDAY. STILL EXPECTING BULK OF CONVECTION THIS AFTERNOON AND EVENING ACROSS THE NORTHERN HALF OF THE CWA...WITH A GENERAL WANE IN THE BULK OF ACTIVITY WITH LOSS OF HEATING...ALTHOUGH DID CONTINUE TO MAINTAIN A SLIGHT CHANCE OVERNIGHT AS THE FRONTAL BOUNDARY CONTINUES TO SAG SOUTH. MODELS ARE CONTINUING TO INDICATE AN ENVIRONMENT CONDUCIVE TO FOG DEVELOPMENT ACROSS THE NORTH...I.E. SOUTHEAST OHIO AND ADJACENT WV COUNTIES...WITH STRATUS ACROSS MUCH OF WV/SOUTHWEST VA...ZONES. CONTINUED TO MAINTAIN A FORECAST REFLECTIVE OF THIS OVERNIGHT. AREAS THAT GET RAIN TODAY...PARTICULARLY ACROSS THE NORTH...WILL LIKELY BE SOCKED IN IN FOG TONIGHT. MADE LITTLE CHANGES TO TEMPERATURES DURING THE PERIOD. && .SHORT TERM /THURSDAY NIGHT THROUGH SATURDAY/... ONGOING FORECAST IS PRETTY MUCH ON TRACK WITH ONLY A FEW RELATIVELY MINOR ADJUSTMENTS PER LATEST MODEL RUNS. THURSDAY NIGHT SHOULD REMAIN DRY FOR MOST LOCATIONS...BUT CONTINUED A SLIGHT CHANCE OF PRECIP ACROSS THE VIRGINIA COUNTIES WITH THE STATIONARY DIFFUSE FRONT REMAINS JUST SOUTH. BY FRIDAY...UPPER RIDGING PASSES OVERHEAD WITH AN UPPER TROUGH PUSHING INTO THE CENTRAL/NORTHERN PLAINS. ITS ASSOC SFC LOW WILL BE MOVING NE-WARD INTO THE WESTERN GREAT LAKES WHICH WILL BEGIN TO LIFT THE PREVIOUSLY-STALLED BOUNDARY NORTHWARD AS A WARM FRONT MAINLY TO OUR WEST BY LATE FRIDAY. THIS APPEARS APPRECIABLY LATER VERSUS PREV MODEL RUNS...WITH THE BULK OF THE BETTER LLVL MOISTURE NOW REMAINING SOUTH OF THE FORECAST AREA FOR MUCH OF THE DAY. WENT AHEAD AND REMOVED SLIGHT CHANCE POPS FOR MOST FOR THE DAY FRIDAY...BUT POOLING LLVL MOISTURE ON SOUTHEAST BOUNDARY LAYER FLOW WARRANTS THE CONTINUATION OF SLIGHT AND LOW CHANCE POPS IN THE EAST/SOUTHEAST MOUNTAIN AREAS. NOT REALLY EXPECTING ANY WIDESPREAD HAZARDS WITH THIS ACTIVITY. HOWEVER WITH PWATS UPWARDS OF 1.60IN AND A WARM CLOUD DEPTH OF NEAR 10KFT...ALONG WITH VERY SLOW CONVECTIVE MOTION UNDERNEATH THE AFOREMENTIONED UPPER RIDGE...A FEW STORMS MIGHT PRODUCE SOME GOOD RAIN AMOUNTS LATE FRI AFTERNOON ESPECIALLY OVER THE SOUTHERN COALFIELDS AREA WHERE THE BETTER INSTABILITY WILL RESIDE. OTHERWISE...A HOT DAY WITH TEMPS IN THE UPPER 80S AND A FEW LOW 90S STILL APPEAR ON TRACK FOR THE LOWLANDS. FRIDAY NIGHT AND SATURDAY THE WARM FRONT MAKES ITS MOVE NORTHWARD ACROSS THE FORECAST AREA...WITH WIND SHIFTING FROM E/SE TO S BY 12 SAT...AND TO THE SW BY 18Z SAT. UPPER FLOW WILL ALSO TURN SW AS WELL WITH UPPER RIDGE AXIS OFF TO THE EAST. STILL EXPECT MOST LOCATIONS TO BE DRY OVERNIGHT FRIDAY NIGHT...BUT DECIDED TO INSERT A SLIGHT CHANCE OF PRECIP TRANSLATING SOUTHWEST TO NORTHEAST PRIMARILY BTWN 06Z-12Z SAT BASED ON CONSENSUS OF MODELS` LLVL MOISTURE FIELDS AND AREA MODEL POINT SOUNDINGS. BY SATURDAY AFTERNOON...PRECIP SHOULD ONCE AGAIN BE MAINLY CONFINED TO THE EASTERN MOUNTAINS WITH A LATE-DAY SHIFT IN BL WINDS BACK TO THE SOUTH AIDING CONVERGENCE...WITH SLIGHT CHANCE POPS ACROSS THE FAR NORTHWEST ZONES. TEMPERATURES WILL BE NEARLY-IDENTICAL TO FRIDAY/S...AND PERHAPS ANOTHER DEGREE OR TWO WARMER...WITH NEAR 90F THE GENERAL RULE FOR SATURDAY IN THE LOWLANDS. && .LONG TERM /SATURDAY NIGHT THROUGH WEDNESDAY/... USED WPC THINKING WITH SOME TWEAKS. WEST TO SOUTHWEST FLOW WITH SEVERAL MID-LEVEL DISTURBANCES WILL RESULT IN ON AND OFF CHANCES OF SHOWERS AND STORMS. A COLD FRONT WILL APPROACH FROM THE NORTHWEST LATE IN THE PERIOD...WITH THIS FEATURE POSSIBLY PUSHING ACROSS THE AREA BY LATE WEDNESDAY. BEST CHANCE OF GETTING WET STILL APPEARS TO BE ON SUNDAY...WHEN A DECENT SHORTWAVE PASSES BY. WPC TEMPS LOOKED GOOD AND WERE GENERALLY USED. && .AVIATION /00Z THURSDAY THROUGH MONDAY/... MAINLY VFR CONDITIONS THROUGH ABOUT 06Z...EXCEPT CKB/EKN WHERE CONVECTION WILL AFFECT THOSE TERMINALS THRU 1Z. HAVE SOME TEMPO IFR VSBY/MVFR CIGS IN CONVECTION FOR THOSE SITES. ELSEWHERE JUST ISOLATED CHANCE OF A STORM AS THE SURFACE FRONT SAGS SE OVERNIGHT...BUT KEPT MENTION OUT OF OTHER TAF SITES DUE TO LOW CHANCE. EXPECT SOME DENSE FOG ACROSS N TAF SITES WHERE IT HAS RAINED AND WILL CLEAR OUT OVERNIGHT. ELSEWHERE...SOME MVFR LOW STRATUS LOOKS TO FORM ALONG AND JUST BEHIND FRONTAL BOUNDARY TO AFFECT KHTS/KCRW/KBKW OVERNIGHT ALONG WITH SOME PERHAPS SOME MVFR VSBY RESTRICTIONS. ANY LOW STRATUS SCT OUT BY MID MORNING ALONG WITH FOG ACROSS THE N FOR A RETURN TO VFR CONDITIONS AREA WIDE. JUST FEW TO SCT FLAT CU...MOST PREDOMINATE ACROSS S WV/SW VA. WIND SHIFT WITH FRONT BUT ON THE LIGHT SIDE. HAVE N TO NE LIGHT SURFACE FLOW BEHIND FRONT...LASTING THRU TOMORROW. FORECAST CONFIDENCE AND ALTERNATE SCENARIOS THROUGH 00Z FRIDAY... FORECAST CONFIDENCE: MEDIUM. ALTERNATE SCENARIOS: TIMING AND DENSITY OF FOG/LOW STRATUS MAY VARY TONIGHT. 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 08/28/14 UTC 1HRLY 00 01 02 03 04 05 06 07 08 09 10 11 EDT 1HRLY 20 21 22 23 00 01 02 03 04 05 06 07 CRW CONSISTENCY H H H H H H H H H H H M HTS CONSISTENCY H H H H H H H H H H H M BKW CONSISTENCY H H H H H H H H M L L L EKN CONSISTENCY H H H M H H L L L L L L PKB CONSISTENCY H H H H H M M H H H L L CKB CONSISTENCY H H H H M M M M H H H H AFTER 00Z FRIDAY... LOCAL IFR IN VALLEY FOG EARLY FRIDAY MORNING. IFR POSSIBLE IN SHOWERS/STORMS SUNDAY. && .RLX WATCHES/WARNINGS/ADVISORIES... WV...NONE. OH...NONE. KY...NONE. VA...NONE. && $$ SYNOPSIS...JSH/50/SL NEAR TERM...SL/30 SHORT TERM...50 LONG TERM...JSH AVIATION...30

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