950 FXUS61 KRLX 131757 AFDRLXAREA FORECAST DISCUSSION National Weather Service Charleston WV 157 PM EDT Sat Sep 13 2025
.SYNOPSIS... High pressure will provide dry and unseasonably warm conditions through the weekend and into early next week. There is potential for a breakdown of this pattern toward the middle of next week.
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.NEAR TERM /THROUGH SUNDAY/... As of 145 PM Saturday...
Surface high pressure remains in control of the weather across the region this afternoon. This is yielding mostly clear skies and very warm temperatures. Afternoon highs will climb into the mid to upper 80s for the lowlands, with the mountains warming into the upper 70s to low 80s. A dry airmass is in place, with afternoon dew points mixing out into the lower to mid 50s. This will allow relative humidity values to drop into the upper 20s to lower 30s, especially across the western lowlands. Fine unsheltered fuels continue to cure out with lack of recent rainfall and will be more prone to carrying fire. However, winds will remain light, generally under 10 mph, which will limit the potential for rapid fire spread.
A weak shortwave trough approaching from the northwest will bring an increase in mid-level cloud cover this evening. While a stray sprinkle cannot be entirely ruled out, the dry low-level airmass suggests most of this will be virga, and the forecast remains dry. Overnight, with light winds and clearing skies behind the departing shortwave, conditions will be favorable for the development of valley fog, which could be locally dense in areas subject to cold air drainage away from major rivers. Lows will be in the upper 50s to around 60.
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.SHORT TERM /SUNDAY NIGHT THROUGH TUESDAY NIGHT/... As of 145 PM Saturday ...
An upper level ridge will build over the region for the remainder of the weekend into early next week. This will continue the stretch of dry weather with mostly clear skies and unseasonably warm temperatures. Highs on Sunday and Monday will be about 10 degrees above normal for mid-September, reaching the upper 80s, with some locations in the Metro Valley possibly touching 90 degrees.
The elevated risk for wildfire starts will continue each afternoon, as minimum humidity percentages drop into the upper 20s to lower 30s. Light winds should again limit the risk for fire spread. Overnight lows will be mild, dropping into the upper 50s and lower 60s, with areas of valley fog redeveloping each night. By Tuesday, the ridge begins to flatten, marking the start of a pattern change.
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.LONG TERM /WEDNESDAY THROUGH SATURDAY/... As of 145 PM Saturday...
The upper ridge that brings the warm and dry conditions early in the week will begin to deamplify and shift eastward by midweek. At the same time, troughing is forecast to develop along the southeast coast. This will promote a more onshore flow, gradually increasing moisture across the forecast area, especially along the higher terrain. This may bring a return of precipitation chances, initially confined to the higher terrain of the mountains on Wednesday.
There is still some uncertainty in model guidance regarding the evolution of this area of low pressure, which will impact how much moisture ultimately makes it into the lower elevations and resultant precipitation chances. For now will defer to drier central guidance solution, but there is some hope in at least some model families for some modest relief from the dry conditions.
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.AVIATION /18Z SATURDAY THROUGH THURSDAY/... As of 145 PM Saturday...
VFR conditions will prevail through this afternoon with light winds and SKC. A weak shortwave will bring some mid-level clouds SCT-BKN this evening, but ceilings should remain VFR. After the upper level cloudiness clears tonight (generally after 08Z), valley fog is expected to develop near EKN, CRW and PKB. The fog should lift and dissipate by 13Z Sunday, returning all sites to VFR.
FORECAST CONFIDENCE AND ALTERNATE SCENARIOS THROUGH 18Z SUNDAY...
FORECAST CONFIDENCE: High, medium for fog.
ALTERNATE SCENARIOS: The coverage and density of valley fog tonight may be limited by lingering mid-level clouds from a passing disturbance.
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 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 H H H H H H H H CKB CONSISTENCY H H H H H H H H H H H H
AFTER 18Z SUNDAY... IFR conditions are possible in valley fog each morning through at least early next week.
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.FIRE WEATHER... As of 145 PM Saturday...
Dry and unseasonably warm conditions will lead to an elevated risk for fire ignition into early next week. Minimum relative humidity values across the lowlands will generally be in the upper 20s to lower 30s, but overnight recoveries should remain good. Winds will remain light, generally below 10 mph, which will limit the threat of fire spread.
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.RLX WATCHES/WARNINGS/ADVISORIES... WV...None. OH...None. KY...None. VA...None.
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SYNOPSIS...JP NEAR TERM...JP SHORT TERM...JP LONG TERM...JP AVIATION...JP FIRE WEATHER...JP
NWS RLX Office Area Forecast Discussion