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Area Forecast Discussion
Issued by NWS Charleston, WV
Issued by NWS Charleston, WV
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997 FXUS61 KRLX 162147 AFDRLX AREA FORECAST DISCUSSION National Weather Service Charleston WV 547 PM EDT Tue Jul 16 2024 .SYNOPSIS... One more hot day today with the chance for storms. A cold front on Wednesday brings much needed rainfall and finally breaks the heat. Isolated t-storms possible this weekend. && .NEAR TERM /THROUGH WEDNESDAY/... As of 540 PM Tuesday... Have updated PoPs across much of the forecast area as scattered showers and thunderstorms have developed over the last couple of hours, gradually shifting to the S/E as time goes on. Gusty winds and locally heavy downpours can be expected with this activity as it continues to shift slowly southeast throughout the evening. The rest of the forecast remains on track. As of 218 PM Tuesday... Diurnal driven convection, enhanced by forcing from an upper-level shortwave, under PWATs reaching 2 inches, is expected to develop this afternoon, spreading strong to severe thunderstorms through evening. SPC has outlooked the northern half of the area with a slight risk for severe thunderstorms, and a marginal risk for the rest of the area. The main threat will be damaging winds and heavy downpours. Unstable conditions remains through the overnight hours, without upper-level support. With dewpoints staying in the lower 70s, convection could survive and affect portions of NE OH and WV tonight. High humidity with a light breeze will keep low temperatures ranging from the mid 70s lowlands, into the mid 60s over our northeast mountains. For Wednesday, the cold front will be closer to our west to provide unstable conditions areawide, before arriving to SE OH by Wednesday evening. Meanwhile, diurnal heating aided by several upper level disturbances will bring good chances for showers and thunderstorms ahead of the cold front Wednesday. The cold front is progged to exit the eastern mountains by Wednesday evening. WPC has the area outlooked into the marginal risk for excessive rainfall. However, due to how dry the region has be recently, the rain will be more beneficial than posing a risk for flooding. Afternoon highs for Wednesday will range from the mid to upper 80s across the lowlands, into the mid 70s northeast mountains. && .SHORT TERM /WEDNESDAY NIGHT THROUGH FRIDAY NIGHT/... As of 330 AM Tuesday... Key Points: * Heavy downpours and a few strong storms possible ahead of and along a cold front on Wednesday. * Cold front breaks the heat wave. Precipitation is expected to be ongoing as a cold front approaches the western flank of the CWA Wednesday morning. Showers and storms should continue to blossom ahead of and along the front, which will slowly proceed east across the area through Wednesday night. A marginal risk for severe weather has been highlighted across the eastern half of the CWA where a few stronger storms could develop during the afternoon. Damaging winds would be the primary hazard. Precipitable water values ranging between 1.5 and 2.25 inches also signal potential for heavy downpours on Wednesday. Localized flash flooding could eventually materialize in poor drainage areas or locations impacted by multiple storms. On Thursday, surface high pressure noses in behind the front beneath a lingering upper trough. Drier conditions should take hold beginning in the northwest quadrant of the CWA, while a northward migrating shortwave could reinvigorate shower and storm activity along and near the mountains during the day. Activity should then diminish after sundown. The arrival of the aforementioned front brings an end to hot weather and allows temperatures to lower to near, or slightly below, normal. Afternoon highs for Wednesday are expected to be in the 80s in the lowlands and mid 70s to 80s along the mountains. Thursday looks to be the coolest day of the week, with highs ranging from mid 60s (mountains) to low 80s (lowlands). && .LONG TERM /SATURDAY THROUGH TUESDAY/... As of 1150 AM Tuesday... After a break in the heat and stormy conditions across much of the area, the weekend into next week looks to become unsettled once again. Southwesterly flow across the area from ridge of high pressure across the east, and upper trough to our west will dominate the period, with increasing heat and humidity for our 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 early next week and PW values surge above 2 inches again, and will be overall slow to move owing to light steering flow. && .AVIATION /22Z TUESDAY THROUGH SUNDAY/... As of 132 PM Tuesday... High cirrus, blown off from convection over western KY, will blanket the area this afternoon. Meanwhile, showers and thunderstorms may develop under an environment characterized by CAPE exceeding 3,000 J/Kg, PWATs exceeding 2.0 inches, and deep layered shear of about 25 knots. This environment will allow for stronger storms to produce damaging winds and heavy downpours ahead of an approaching cold front. Continued coding VCTS across most sites as it is difficult to pin point whether strong thunderstorms would affect any terminal. Will need amendments to better time convection over terminals this afternoon and evening. Showers and storms will persist into the overnight hours tonight as several shortwaves pass through the area. Guidance suggests low stratus may develop overnight bringing periods of MVFR/IFR ceilings across the northern sections, including PKB and CKB, roughly from 09Z to 14Z Wednesday. Breezy this afternoon gusting up to 20 knots. Southerly flow becomes light and variable tonight, and from the south on Wednesday. Winds will be strong, variable and gusty near stronger storms. FORECAST CONFIDENCE AND ALTERNATE SCENARIOS THROUGH 00Z THURSDAY... FORECAST CONFIDENCE: Medium. ALTERNATE SCENARIOS: Coverage and intensity of showers and storms may vary from forecast. Brief MVFR/IFR restrictions are possible within showers and storms. 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 21 22 23 00 01 02 03 04 05 06 07 08 EDT 1HRLY 17 18 19 20 21 22 23 00 01 02 03 04 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 H H 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 M M M M H H H M CKB CONSISTENCY H H H H H H H H H H H H AFTER 00Z THURSDAY... IFR conditions are possible Wednesday and Thursday with showers and thunderstorms. && .CLIMATE... As of 300 AM Tuesday... A prolonged heat wave continues across the region through Tuesday. The record high temperatures for Tuesday, July 16 are listed below for our official climate sites, along with the current forecast values. Forecast / Record Highs ----------------------- Tuesday, 7/16 | ----------------------- CRW | 95 / 104 (1988) | HTS | 94 / 102 (1988) | CKB | 92 / 97 (1995) | PKB | 90 / 102 (1988) | BKW | 90 / 96 (1912) | EKN | 90 / 99 (1988) | ----------------------- && .RLX WATCHES/WARNINGS/ADVISORIES... WV...None. OH...None. KY...None. VA...None. && $$ SYNOPSIS...ARJ/SL NEAR TERM...ARJ/GW SHORT TERM...SL LONG TERM...SL AVIATION...ARJ CLIMATE...MEK