Area Forecast Discussion
Issued by NWS Charleston, WV

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000 FXUS61 KRLX 101946 AFDRLX Area Forecast Discussion National Weather Service Charleston WV 246 PM EST Sun Dec 10 2017 .SYNOPSIS... Next upper trough and cold front move in Monday night, with a stronger upper trough on Tuesday. Another cold shot arrives late next week. && .NEAR TERM /THROUGH MONDAY/... As of 155 PM Sunday... Upper level pattern remains active with the closed upper level low anchored over the Hudson Bay area. Another vort max within the flow aloft will drop in from the Great Lakes over the next few hours. Sensible weather impacts will be more low mid level cloud cover that will bring flurries and low end chances for measurable precipitation over the northeast mountains later tonight after 05Z. Flow then flattens out Monday ahead of the next system which brings a clipper system in for the short term period. For the most part, with the exception of the aforementioned northeast mountains tonight, the near term forecast is dry. Warm front aloft brings a tight temperature gradient and increase in 850hPa temperatures Monday, so should see a recovery in the temperatures across the southern and western zones to mid 40s. && .SHORT TERM /MONDAY NIGHT THROUGH WEDNESDAY NIGHT/...
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As of 245 PM Sunday... Clipper digs south into Great Lakes with strengthening area of low pressure at the surface. Associated cold front will move across Monday night and Tuesday with cold air advection taking place through the short term period. Vigorous 85h thermal trough moves across in wake of front passage. Models in general agreement that enough lift and dendritic growth zone will be in place to allow for a decent mountain snow event Tuesday into Wednesday. Bumped snow amounts up slightly for the eastern mountains, while leaving lighter snow amounts for the low lands. Expect to see some advisories needed for the eastern mountains as timeframe approaches for favored upslope areas. Surface gradients will be in place Wednesday morning for near or below zero wind chill values over the mountains. Other areas should see calm enough morning winds in a decoupled nocturnal boundary layer where wind chill will not be much concern. Thermal trough axis begins to shift eastward late Wednesday. Trimmed max and min temp values from model blends, keeping closer values with the inherited forecast.
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&& .LONG TERM /THURSDAY THROUGH SUNDAY/...
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As of 245 PM Sunday... Upper trough swings east with forecast guidance diverging after the middle of the week. In long term period made minimal adjustments to the model blend for days 5 through 7. Any precip we do receive this time period will likely be all snow as the models at least agree that the cold air remains in place through the end of the week.
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&& .AVIATION /20Z SUNDAY THROUGH FRIDAY/... As of 1250 PM Sunday... MVFR ceilings will yield to VFR over the next 2-4 hours for the remaining terminals across the northern tier today. Another upper level wave tonight brings a low chance for snow showers once again for EKN and the highest ridgetops, and also MVFR ceilings between 2 and 3kft after 09Z Monday. FORECAST CONFIDENCE AND ALTERNATE SCENARIOS THROUGH 18Z MONDAY... FORECAST CONFIDENCE: High. ALTERNATE SCENARIOS: Timing of MVFR tonight 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. UTC 1HRLY 18 19 20 21 22 23 00 01 02 03 04 05 EST 1HRLY 13 14 15 16 17 18 19 20 21 22 23 00 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 H H H M EKN CONSISTENCY H H H H H H H H H H H M PKB CONSISTENCY H H H H H H H H H H H M CKB CONSISTENCY M H H H H H H H H H H M AFTER 18Z MONDAY... Another wave Monday night through Tuesday is forecast to have similar, squally snow showers producing IFR conditions, favoring the mountain terminals. IFR in snow possible on Thursday. && .RLX WATCHES/WARNINGS/ADVISORIES... WV...None. OH...None. KY...None. VA...None. && $$ SYNOPSIS...MPK/26 NEAR TERM...26 SHORT TERM...KMC LONG TERM...KMC AVIATION...26

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