Area Forecast Discussion
Issued by NWS Charleston, WV

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500 FXUS61 KRLX 220542 AFDRLX Area Forecast Discussion National Weather Service Charleston WV 142 AM EDT Tue May 22 2018 .SYNOPSIS... Cold front crosses Tuesday night. High pressure to end the work week but more unsettled weather arrives in time for the weekend. && .NEAR TERM /THROUGH TODAY/... As of 945 PM Monday...Moderate to heavy rain continues across parts of the NE Mountain Counties and a flash flood warning remains in effect in those areas. Have updated PoP based on latest Radar and Meso Model trends. Complex currently across NWS ILN`s area in Ohio will likely clip our SE Ohio Counties tonight. May have to watch for possible water issues in areas hit by storms earlier today, where parts of Athens and Washington County received over 2 inches in some isolated spots. As of 510 PM Monday...Increased PoP across most of the area with thunderstorms being more widespread than previously forecast. Radar is indicating numerous outflow boundaries that have been the focus for new convection to initiate. Some storms have been able to reach severe limits and this threat will continue into this evening until about sunset. Flash flooding is also a concern at this time. As of 145 PM Monday... Front which was stalled near I-64 is starting to drift back north early this afternoon... a trend which should continue through the remaining of the afternoon. Starting to get showers popping up near and south of the front which will also gradually expand in the instability of the warm sector this afternoon and drift northward into this evening. Also currently have a cluster of showers and storms approaching the far NW forecast area which. Models had been struggling a bit with activity north of the front, but HRRR seems to have latched on to this and carries it across the NW corner of the CWA over the next couple hours. Shear is not all that great today -- 0-6km bulk shear maxes out around 25kts across the west and north, but with plenty of instability some storms may become strong to severe with gusty outflow and hail the main threat. With slower storm motion and precipitable water around 1.5 inches, any repetitive cells could lead to isolated water concerns. In a rather juicy atmosphere think at least some isolated to scattered showers and storms will linger through the night so kept POPs going. A cold front will approach from the west late Tuesday. Ahead of this front we should see areas of showers and thunderstorms across the forecast area. Did go with an area of likely POPs crossing from west to east through the day associated with an upper level shortwave trough running out ahead of the surface cold front. With lots of clouds around all day, instability is pretty sparse, but with the upper level support and some surface convergence an isolated stronger storm or two is possible. && .SHORT TERM /TONIGHT THROUGH THURSDAY NIGHT/... As of 344 PM Tuesday... The cold front will pass through Tuesday night into Wednesday morning with a good chance showers and a few thunderstorms. A drier airmass moves in behind this front by Wednesday afternoon and persists through Thursday night. Dewpoints drop into the 50s behind the front so a dry and rather comfortable period is expected Wednesday night through Thursday night. && .LONG TERM /FRIDAY THROUGH MONDAY/... As of 344 PM Tuesday... High pressure moves east of the area on Friday, and return flow begins to transport increasing amounts of moisture northward from the Gulf of Mexico and western Atlantic into our area. Dewpoints will increase into the 60s on Friday and there will be a small chance for a shower and/or storm to develop over our southern counties. This threat for showers/storms will then expand northward Saturday through Monday. Generally kept with the blended model guidance for the weekend forecast to wash out any model differences regarding how fast the moisture returns and the track of the responsible storm system which develops over the Gulf. This results in chance PoPs throughout the weekend with highs in the 80s Friday and Saturday, dropping to the 70s to near 80 on Monday. && .AVIATION /06Z TUESDAY THROUGH SATURDAY/... As of 135 AM Tuesday... Showers and thunderstorms can be expected today, causing some restrictions. Outside of the showers and thunderstorms, the only restrictions expected are for some patchy fog early this morning. A cold front will move through Tuesday night, with additional showers and thunderstorms possible. FORECAST CONFIDENCE AND ALTERNATE SCENARIOS THROUGH 06Z WEDNESDAY... FORECAST CONFIDENCE: Medium. ALTERNATE SCENARIOS: Timing, density, and location of fog could vary. Timing and restrictions in showers and thunderstorms could 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 TUE 05/22/18 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 H M M M M M M H H M HTS CONSISTENCY H H H H H H H H H M M M BKW CONSISTENCY H H H H M M M M M M H M EKN CONSISTENCY M M M M M M M M M L H M PKB CONSISTENCY H H H H M H M L L M M L CKB CONSISTENCY H H H H H H H H H H H L AFTER 06Z WEDNESDAY... Brief periods of IFR possible in showers and storms Tuesday night. && .RLX WATCHES/WARNINGS/ADVISORIES... WV...None. OH...None. KY...None. VA...None. && $$ SYNOPSIS...MZ/30 NEAR TERM...MZ/MPK SHORT TERM...ABE LONG TERM...ABE/30 AVIATION...RPY

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