375 FXUS62 KGSP 131750 AFDGSPArea Forecast Discussion National Weather Service Greenville-Spartanburg SC 150 PM EDT Mon Oct 13 2025
.SYNOPSIS... A coastal low will slowly drift offshore through mid week as dry and warmer high pressure builds in across the region. This will allow for a return of above normal temperatures through Wednesday. A backdoor cold front drops south across the area Thursday bringing a brief cool down before temperatures warm again over the weekend. The next chance for rain may come on Sunday as an upper trough crosses our region.
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.NEAR TERM /THROUGH TUESDAY/... As of 1:35 PM EDT Monday: The shield of lower stratocu over the I-77 Corridor has mostly lifted/sct over the past few hrs with mostly sunny skies across the bulk of our fcst area. Plentiful sunshine coupled with increasing thickness values/rising heights should allow high temps to approach 80 degrees outside of the mtns this afternoon. Less cloud cover and the relatively dry airmass along with decoupling sfc winds, will allow lows overnight to cool to just above normal. The better radiational cooling condi- tions should also help produce more fog/low stratus in the mtn valleys Tuesday morning.
Otherwise, the embedded upper trof/closed low currently centered over our area will eventually lift NE and off the Atlantic Coast later tonight and into Tuesday. In its wake, stout upper ridging will spread further eastward and over the Southeast. At the sfc, the stacked/occluding low just off the SC Coast is expected to finally shift east and further offshore later today/tonight. In its wake, broad sfc high pressure will spread into our area from the west and linger thru the near-term period. This should keep us dry with temperatures continuing to gradually warm on Tuesday.
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.SHORT TERM /TUESDAY NIGHT THROUGH FRIDAY/... As of 100 PM Monday: A large, highly amplified upper ridge will extend from the Southern Plains to the Upper Midwest thru the short term. Shortwave energy will round the ridge axis and dive thru the Great Lakes, helping carve out an upper low invof Maine and New Brunswick. Wednesday will be warm and sunny, with highs around 10 deg above normal. Then a dry backdoor cold front will slip thru the area Wednesday night, as sfc high pres builds into the eastern Great Lakes and Mid-Atlantic. The front may not even have any clouds with it, and just bring temps back down to near normal for Thursday and Friday. Dry weather will continue thru the end of the workweek, with mountain valley fog possible each morning.
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.LONG TERM /FRIDAY NIGHT THROUGH MONDAY/... As of 130 PM Monday: Upper ridge axis will begin to shift east this weekend, shifting from the Mississippi Valley to the Eastern Seaboard by late Saturday. Corresponding sfc high will also shift east, allowing a return flow to spread across the region and bring temps back above normal. The latest deterministic guidance is in better agreement on a deep longwave trough ejecting out of the Rockies and becoming negatively tilted across the Ohio Valley by Sunday. An attendant cold front will push thru the Mid-Mississippi Valley and pick up speed as it crosses the OH/TN Valleys Saturday night thru Sunday. Such dry air out ahead of the cold front may result in a thinning frontal band of moisture. This may limit QPF and any thunderstorm chances by the time the front reaches the forecast area. Models are in decent agreement on the fropa occurring Sunday with little to no sbCAPE. The NBM PoPs look good, with high-end chc to low-end likely PoPs in the mountains Sunday, tapering to just 20-30% chance in our eastern zones. Temps will be near to a few deg above normal Sunday and Monday.
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.AVIATION /18Z MONDAY THROUGH SATURDAY/... At KCLT and elsewhere: Drier air filtering into the fcst area and winds out of the N to NW has resulted in a broad field of few to sct fair-wx cumulus in the 3500 to 4500 ft range this afternoon. Conditions should be favorable for mtn valley fog/low stratus to develop again early Tuesday. The main thing working against re- strictions developing at KAVL will be NW winds expected to re- main > 5 kts thru the overnight/morning over much of the French Broad Valley. Thus, confidence remains low on timing/magnitude of any restrictions at KAVL. For now, I limit restrictions to 5SM/ FEW005 from 09 to 13z. Otherwise, expect dry VFR conditions thru the 18z taf period. Winds will remain NLY to NWLY thru tomorrow morning, becoming more NELY tomorrow afternoon.
Outlook: Expect mostly dry, VFR conditions to persist thru the week, except for the potential for mountain valley fog and/or low stratus each morning.
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.GSP WATCHES/WARNINGS/ADVISORIES... GA...None. NC...None. SC...None.
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SYNOPSIS...DEO NEAR TERM...JPT SHORT TERM...ARK LONG TERM...ARK AVIATION...JPT
NWS GSP Office Area Forecast Discussion