Area Forecast Discussion
Issued by NWS Charleston, WV

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000 FXUS61 KRLX 290538 AFDRLX AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE CHARLESTON WV 138 AM EDT WED JUL 29 2015 .SYNOPSIS... HEAT CONTINUES ON WEDNESDAY BEFORE STRONG A COLD FRONT ARRIVES WEDNESDAY NIGHT. A DRY STRETCH WILL FOLLOW STARTING FRIDAY...WITH TEMPERATURES CLIMBING BACK ABOVE NORMAL OVER THE WEEKEND. && .NEAR TERM /THROUGH TODAY/...
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ADJUSTED DOWN HOURLY TEMPERATURES OVERNIGHT. REST OF FORECAST REMAINS REPRESENTATIVE. PREVIOUS DISCUSSION BELOW... 1045 PM UPDATE... FCST ON TRACK WITH CONVECTION GONE FOR THE NT...AND FOG ALREADY BEGINNING TO FORM. 730 PM UPDATE... FCST ON TRACK AS CONVECTION IS BEGINNING TO WANE FOR THE EVENING. PREV DISCN... INCREASED POPS INTO HIGH CHANCE RANGE FOR THE N MOUNTAINS THIS AFTERNOON. AGITATED CU FIELD WITH SOME POPCORN SHRA ALREADY POPPING UP. WITH SOME LOW LEVEL CONVERGENT FLOW...ALBEIT WEAK...AMID A JUICY AIRMASS AND ELEVATED HEAT SOURCE...THERE WILL BE NO PROBLEMS WITH THE INCREASED COVERAGE OF SHRA/TSRA THERE TODAY. ELSEWHERE...EXTENDED SOME CHC POPS VIA SCT COVERAGE WORDING INTO THE C AND N LOWLANDS WHERE A WEAK CONVERGENT ZONE REMAINS. THE HI RES MODELS ARE PICKING UP ON THIS FOR ANOTHER AREA TO FOCUS ON FOR AFTERNOON DEVELOPMENT. THIS MAKES SENSE GIVEN WHAT HAPPENED YESTERDAY WITH A BELT OF H7 MOISTURE REMAINING OVER SE OH AND N WV. WEAK FLOW WILL MEAN SOME RIDGE TOP HUGGERS AND DOWNPOURS. TEMPS WILL TOP OUT IN THE UPPER 80S TO 90 OR 91 IN THE LOWLANDS. THERE IS QUITE THE DRY LAYER ABOVE H7...IN CLOSE PROXIMITY OF THE MIXING HEIGHT. RUC/HRRR ARE A BIT TOO AGGRESSIVE MIXING THIS DOWN GIVEN THE VERY WEAK FLOW ALOFT. THOUGH...FEEL A COUPLE DEGREE DROP IN DEWPOINTS THIS AFTERNOON IS WARRANTED...ESPECIALLY N WV. AS SUCH...THINK WE WILL COME UP SHORT OF HEAT ADVISORY CRITERIA OVER NE KY/SE OH/S WV. SHRA/TSRA COVERAGE WANES THIS EVENING...LEAVING JUST A FEW LINGERING CLOUDS WHICH WILL GIVE WAY TO ANOTHER NIGHT OF DENSE RIVER VALLEY FOG. FOR WEDNESDAY...EXPECT SCT SHRA/TSRA OVER THE MOUNTAINS MUCH LIKE TODAY. THE OLD FRONTAL BOUNDARY WILL BE OVERTAKEN BY DEVELOPING W FLOW...SO THINK JUST AN ISOLATED SHRA/TSRA IN THE AFTERNOON IN THE LOWLANDS IF EVEN THAT. EXPECT QUITE A BIT OF CU TOMORROW THOUGH...WHICH MAY TAMPER HIGHS A DEGREE IN WHAT OTHERWISE WILL BE THE WARMEST DAY OF THE WEEK. HAVE HIGHS 90 TO 92 IN NE KY/SE OH/S WV LOWLANDS. THIS IN COMBINATION WITH LOWER 70S DEWPOINTS WILL YIELD HEAT INDICES AROUND A 100F. WILL CONTINUE MENTION OF POSSIBLE HEAT ADVISORY IN THE HWO.
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&& .SHORT TERM /TONIGHT THROUGH FRIDAY/... COLD FRONT PUSHES THROUGH WEDNESDAY NIGHT...BUT WILL LACK SOME ENERGY DUE TO THE TIME OF DAY WHICH IT MOVES IN...SO NEED TO LEAVE THE POPS AT CHANCE. FORCING IS MINIMAL...AND BEHIND THE FRONT...WILL BE BACK INTO A STRONG SURFACE RIDGING PATTERN WITH THE TEMPERATURES AND DEWPOINTS SLOWLY CREEPING UPWARDS AGAIN. && .LONG TERM /FRIDAY NIGHT THROUGH TUESDAY/... EXTENDED REMAINS DRY UNTIL THE MIDDLE OF NEXT WEEK WHEN LOW CHANCES FOR POPS COME BACK INTO PLAY. LOWLAND FORECAST HIGHS RANGE FROM THE UPPER 80S TO 90 DEGREES...WITH THE MOUNTAINS THEIR USUAL 5-15 DEGREES OFF THE PACE. && .AVIATION /06Z WEDNESDAY THROUGH SUNDAY/...
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IR SATELLITE IMAGES SHOW FEW MID LEVEL CLOUDS PASSING ACROSS...BUT OVERALL MOSTLY CLEAR SKIES WILL PREVAIL. DEWPOINTS REMAIN AROUND 70 DEGREES. WITH TEMPERATURES DROPPING INTO THE LOWER 70S...EXPECT IFR FOG FORMATION OVER SOME RIVER VALLEYS DURING THE PREDAWN HOURS. PKB ALREADY SHOWING MVFR VISIBILITIES DUE TO FOG. EXPECT DENSE VALLEY FOG DEVELOPING AROUND 09Z AT MOST PLACES...EXCEPT BKW. ANY MORNING FOG WILL QUICKLY DISSIPATE BY 12-13Z...LEADING TO VFR CONDITIONS FOR WEDNESDAY. SCATTERED CONVECTION WED AFTERNOON WILL BE CONFINED MAINLY TO THE MOUNTAINS. FLOW WILL CONTINUE LIGHT AND VARIABLE AT THE SFC AND LIGHT NW ALOFT. FORECAST CONFIDENCE AND ALTERNATE SCENARIOS THROUGH 06Z THURSDAY... FORECAST CONFIDENCE: MEDIUM TO HIGH. ALTERNATE SCENARIOS...TIMING AND INTENSITY OF OVERNIGHT AND WED MORNING FOG MAY VARY. 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 WED 07/29/15 UTC 1HRLY 03 04 05 06 07 08 09 10 11 12 13 14 EDT 1HRLY 23 00 01 02 03 04 05 06 07 08 09 10 CRW CONSISTENCY H H M M M L L L L L L M HTS CONSISTENCY H H M M M L L L L L M H BKW CONSISTENCY H H H H H H H H H H M M EKN CONSISTENCY H H H M M L L L L L L M PKB CONSISTENCY H H M M L L L L L L L M CKB CONSISTENCY H M L L L L L L L L L M AFTER 06Z THURSDAY... AHEAD OF AND ALONG A STRONG COLD FRONT...IFR POSSIBLE IN SHOWERS/STORM OVERNIGHT WEDNESDAY NIGHT INTO THURSDAY. LOW CLOUDS/FOG POSSIBLE IN WAKE OF FRONT IN THE SOUTH AND EAST THURSDAY NIGHT/EARLY FRIDAY MORNING.
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&& .RLX WATCHES/WARNINGS/ADVISORIES... WV...NONE. OH...NONE. KY...NONE. VA...NONE. && $$ SYNOPSIS...TRM/30/26 NEAR TERM...TRM/30 SHORT TERM...26 LONG TERM...26/DTC AVIATION...ARJ

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