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Area Forecast Discussion
Issued by NWS Charleston, WV
Issued by NWS Charleston, WV
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290 FXUS61 KRLX 181654 AFDRLX AREA FORECAST DISCUSSION National Weather Service Charleston WV 1254 PM EDT Thu Jul 18 2024 .SYNOPSIS... A cold front presses south of the area today. Mainly dry and cooler finish to the work week. Isolated t-storms possible this weekend. && .NEAR TERM /THROUGH FRIDAY/... As of 630 AM Thursday... Forecast remains on track this morning, where the last batch of precipitation ahead of the frontal passage continues to glide up the spine of the Appalachians from the southwest. A few lightning strikes have been noted in this area, but do not foresee any severe or flooding concerns with this last sweep of rain today. The cold front was analyzed to be aligned along the Ohio River around the time of writing, and will continue its southeastward progress and clear the forecast area by later on this afternoon. Clouds overnight did encourage temperatures in northeast West Virginia to stay a few degrees warmer than anticipated, so adjusted hourly temps upward from now into the early afternoon. Otherwise, no other changes were needed with this update. As of 200 AM Thursday... An upper level trough pressing into New England today will drive a surface cold front through the forecast area. Abundant low level moisture still present overhead preceding the frontal passage has led to a combination of low stratus and brief spurts of fog early this morning. SPC Mesoanalysis also depicts pockets of 300mb vorticity pressing through the Tennessee Valley and up into the Central Appalachians early this morning, which has maintained isolated to scattered clusters of showers streaming in from the southwest. The front is anticipated to reach the spine of the Appalachians shortly after daybreak and aiming for the Carolinas by this afternoon. High pressure digging down from the Upper Midwest will begin to influence the area today, slowly chipping away at lingering cloud cover and promoting drier weather for parts of the forecast area. Post-frontal CAA northwesterly flow tends to maintain clouds longer than models suggest, so did hold onto broken/overcast into the early afternoon before allowing skies to scatter out from northwest to southeast. A low end chance for a shower or afternoon storm will still exist today from the southern coalfields and up the higher terrain, but severe weather is unlikely in the wake of the cold front. Dry weather then overtakes the entire forecast area this evening. Relief from the heat wave will also be advertised with the frontal passage today. The approaching high will introduce lowering dew points/humidity levels this afternoon and evening, and cooler overnight temperatures late tonight into early Friday morning. && .SHORT TERM /FRIDAY NIGHT THROUGH SUNDAY NIGHT/... As of 1255 PM Thursday... Southwesterly flow will increase across the area this weekend in response to gradually deepening trough across the midwest. A gradual uptick in the heat and humidity, along with several waves moving through the flow and daytime heating will keep the weather unsettled over the weekend. The bulk of the activity this weekend generally looks to remain south and east of the Ohio River, although a shower or storm cannot be ruled out elsewhere. Overall flow over the weekend will be rather light, and storms will contain brief heavy downpours. Severe is not anticipated at this point. && .LONG TERM /MONDAY THROUGH WEDNESDAY/... As of 1202 PM Thursday... Increasingly unsettled conditions look to take hold next week as an upper trough deepens across the central U.S., with moisture continuing to surge northward into the region. Shortwaves moving through the flow at times, combined with the effects of diurnal heating will keep a mention of shower and storm chances in the forecast for the entire extended area wide. Any storms will contain heavy downpours, particularly as we get into the middle of next week and PW values surge above 2 inches again. The good news is despite the increasing humidity, heat indices don`t look to get too out of control as convection/cloud cover should keep a lid on temperatures getting too warm. && .AVIATION /18Z THURSDAY THROUGH TUESDAY/... As of 630 AM Thursday... A cold frontal passage is underway this morning in the region, with a slew of fog and stratus festering over our TAF sites. Ceilings were beginning to lift slightly at the time of writing, but did opt for a tempo group to open up the valid issuance for bouncing flight rules. A cluster of showers put ahead of the front will glide up the southern coalfields and into the higher terrain over the next few hours. The front is progged to complete its passage by this afternoon, with drier weather set to resume across the forecast area by late in the day into tonight. Skies will be slower to scatter out throughout the day, but VFR is slated to return for most sites around 15Z/16Z. However, some lingering VCTS was included at BKW for a brief time early this afternoon before drying out. Another decent signal for river valley fog is progged for late Thursday night into Friday morning. Light and variable winds this morning will become more distinguished out of the northwest in the wake of FROPA later today. FORECAST CONFIDENCE AND ALTERNATE SCENARIOS THROUGH 18Z FRIDAY... FORECAST CONFIDENCE: Medium. ALTERNATE SCENARIOS: Restrictions with fog/stratus this morning may vary from the 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. UTC 1HRLY 17 18 19 20 21 22 23 00 01 02 03 04 EDT 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 H HTS CONSISTENCY H H H H H H H H H H H H BKW CONSISTENCY L M H H H H H H H H H H EKN CONSISTENCY H H H H H H H H H H H H PKB CONSISTENCY H H H H H H H H H H H H CKB CONSISTENCY H H H H H H H H H H H H AFTER 18Z FRIDAY... IFR conditions are possible w/ river valley fog Friday morning, then along the mountains Saturday morning w/ stratus and showers. && .RLX WATCHES/WARNINGS/ADVISORIES... WV...None. OH...None. KY...None. VA...None. && $$ SYNOPSIS...ARJ/SL NEAR TERM...MEK/ARJ SHORT TERM...SL LONG TERM...SL AVIATION...MEK