Area Forecast Discussion
Issued by NWS Charleston, WV

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000 FXUS61 KRLX 230530 AFDRLX Area Forecast Discussion National Weather Service Charleston WV 130 AM EDT Sun Apr 23 2017 .SYNOPSIS... Upper level low passes to the south and then to the east, keeping rain mainly in the south and east through Sunday. High pressure early next week. Next system late Thursday. && .NEAR TERM /THROUGH TODAY/... As of 950 PM Saturday... Cut back POPs a bit more overnight as trend continues to be south and east of CWA. Will continue current flash flood watch due to precip expected tomorrow across the southern coal fields and creeks and streams still running pretty high across that area. As of 250 PM Saturday... Eastward moving short wave currently over central parts of WV will be the main player this afternoon as it moves eastward. Hi res models and radar trends indicate a break in the widespread precip behind this feature from northwest to southeast this afternoon. However, with the frontal boundary hanging just south of the area, will maintain higher pops in the south behind this feature remainder of this afternoon. Any thunder will be confined to the far south this afternoon closer to the frontal boundary which is stalled just to our south. Otherwise, rain will be winding down from at least the I64 corridor north and west as both the short wave exits and drier air filters down from the north into these areas this afternoon. Will continue the current Flash Flood watch for the southern mountains with continued higher pops. For tonight and Sunday, the models are in much better agreement in handling the main player for this period. An upper level low will develop over the southeastern states tonight and then lift up to the northeast Sunday. This will combine with the stalled front to our south and bring rain back to the north and east. However, it loos like the mountains will see most of the QPF from this system, while the west and north may see little or no rain. Thus, the flash flood watch will continue in place for the southern mountains. Temps will remain on the cool side with being north of the front. && .SHORT TERM /TONIGHT THROUGH TUESDAY/... As of 245 PM Saturday... As the stacked low pressure system creeps towards the southeast coast, inverted troughs aloft and at the surface will prevent a quick exit to the showers through the Monday evening time frame. The system will travel up the coast, lending its influence both in terms of the non dry forecast and considerably cooler temperatures on the eastern slopes of the mountains for Monday and Tuesday, comparatively to the lowlands on the other side. Will take some time to eliminate the mid level moisture from the lows to the east, so have a mainly cloudy forecast in place for the short term. && .LONG TERM /TUESDAY NIGHT THROUGH SATURDAY/... As of 245 PM Saturday... After warming through recovering thicknesses and 850mb temperatures through mid week, long range operational models still having trouble with the next system, which has now become more of a Thursday entity. Two weak upper level waves will merge to the northwest over the western Great Lakes, and continue a track northeastward into northern Ontario, but a frontal system will be poised to push through the Ohio Valley. However, with the main energy well away from our CWA, the frontal system will likely shear out, and the low POP solution into Thursday night is likely to fluctuate in coming runs, but stay on the low end. Baroclinic zone sets up into the weekend, so the higher temperature forecast for the end of the week that came out yesterday has come down a few degrees back to lowland low 80s. && .AVIATION /06Z SUNDAY THROUGH THURSDAY/... As of 126 AM Sunday... VFR conditions, generally along and north of a line from KCRW to KCKB. This will be the general rule through at least 15Z, although, patchy mvfr and ifr fog cannot be completely ruled out at this point in areas that have cleared. South and east of a line from KCRW to KCKB, IFR and LIFR conditions exist, particularly at site KBKW, where VLIFR is expected to continue through at least 15Z when some improvement to IFR is expected. Otherwise, shra and lowering clouds will increase from south to north later today, generally after 15Z, with widespread MVFR and local IFR conditions redeveloping, mainly along and south of KCRW, with mainly VFR conditions expected north of KCRW into parts of northeast KY, southeast OH, and northern WV. FORECAST CONFIDENCE AND ALTERNATE SCENARIOS THROUGH 06Z MONDAY... FORECAST CONFIDENCE: Medium. ALTERNATE SCENARIOS: Fog could develop in areas that have cleared tonight. Timing and development of rain and associated MVFR and IFR conditions on Sunday may vary from forecast. 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 SUN 04/23/17 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 M M M M M M M M M M M L HTS CONSISTENCY H H H H H H H H H M M L BKW CONSISTENCY M M M M M M L L L L L L EKN CONSISTENCY M H H H H M M M M H H M PKB CONSISTENCY H H H H H H H H H H H M CKB CONSISTENCY H H H H H H H H H H H M AFTER 06Z MONDAY... IFR possible into Monday with another wave of low pressure. && .RLX WATCHES/WARNINGS/ADVISORIES... WV...Flash Flood Watch through this evening for WVZ033-034. OH...None. KY...None. VA...Flash Flood Watch through this evening for VAZ003-004. && $$ SYNOPSIS...JMV/26 NEAR TERM...JMV/MZ SHORT TERM...26 LONG TERM...26 AVIATION...SL

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