Area Forecast Discussion
Issued by NWS Greer, SC

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815 FXUS62 KGSP 070635 AFDGSP Area Forecast Discussion National Weather Service Greenville-Spartanburg SC 235 AM EDT Mon Jul 7 2025 .SYNOPSIS...
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Hot and more humid conditions return on today and linger through midweek featuring daily afternoon and evening shower and thunderstorm chances. The heat abates somewhat into the weekend but daily afternoon and evening shower and thunderstorm chances continue.
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&& .NEAR TERM /THROUGH TONIGHT/...
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As of 2:15 AM EDT Monday: The remnants of Tropical Depression Chantal continue to gradually make their way northward and into southern Virginia. Any rain bands associated with the system are now well to our NE. We have had a small cluster of showers with a few embedded lightning strikes develop over our southernmost tier of counties over the past couple of hrs, but this activity should dissipate over the next hour or two. Otherwise, things should remain relatively quiet thru the morning with lows near, if not slightly above climatology for early July. The remnants of Chantal will continue to weaken as it drifts N/NE today, with the system eventually moving up and off the mid-Atlanitc Coast and merging with weak low pressure to its north. We will remain under the western periphery of broad upper ridging centered well offshore today and tonight with some degree of weak, downslope flow across most of our area. Sfc winds will return to SWLY outside the mtns, with tempera- tures expected to climb back into the mid to upper-90s across most of our lower terrain this afternoon. Fairly deep mixing is expected this afternoon, which coupled with the weak down- slope flow should keep dewpts low enough to prevent heat index values from reaching Heat Advisory criteria of 105 degrees. Dry profiles aloft along with the decent mixing should limit convective development to widely sct showers/thunderstorms over the mtns and foothills with more isolated development elsewhere. Where convection does fire, weak shear and rela- tively dry mid-levels could support an isolated microburst or two.
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&& .SHORT TERM /TUESDAY THROUGH WEDNESDAY NIGHT/...
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As of 115 AM Monday: Mid and upper level ridging over the SE CONUS holds on Tuesday then is suppressed on Wednesday as a short wave moves into the area from the west. Despite the ridge on Tuesday, the atmosphere becomes unstable with diurnal convection developing favoring the mountains. That said, a lee trough will help focus convection outside of the mountains leading to the potential for a few severe storms. Damaging winds would be the main threat with relatively high DCAPE and sfc delta theta-e. Expect better coverage of convection across the area Wednesday given the better upper forcing and another lee trough. DCAPE and sfc delta theta-e are lower as moisture becomes deeper, limiting severe chances. Highs will be in the mid to upper 90s outside of the mountains and around 90 in the mountain valleys. Dew points should mix out during the afternoon keeping heat index values below the 105 Heat Advisory criterion with values around 100 or slightly higher. Highs drop a couple of degrees Wednesday, with fewer locations still reaching the 100 degree heat index range.
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&& .LONG TERM /THURSDAY THROUGH SUNDAY/...
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As of 140 AM Monday: An active period expected through the long term as a series of short waves move near or cross the area. A stationary front remains to our north as a series of low pressure centers move along it. A lee trough develops each day to help focus convection. A moist, unstable air mass remains in place as well. The best chances for widespread convection are Wednesday and Thursday with some recession to the mean for the weekend with a more typical PoP pattern favoring the mountains. The threat of excessive rainfall could increase Thursday and Friday given the previous days convective potential. Severe chances look to be limited but not zero given the continued deep moisture leading to lower DCAPE values. Highs also see a recession to the mean with near normal values Thu and Fri then rising a couple of degrees for the weekend.
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&& .AVIATION /07Z MONDAY THROUGH FRIDAY/...
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At KCLT and elsewhere: Expect VFR conditions thru the 06z taf period at all taf sites. The only exception could be localized restrictions from any SHRA/TSRA that directly impact the terminals this aftn/evening. The rain and deeper moisture remained to our east on Sunday, thus a relatively dry airmass should limit the fog/low stratus potential overnight across our area. Expect few to sct cumulus and some higher cirrus to develop this afternoon, with isolated to sct showers and thunderstorms developing mainly over the mtns during the aftn/evening. Based on the latest CAM guidance, there appears to be enough coverage to warrant a PROB30 for TSRA for KAVL, KCLT, and KHKY, although coverage will likely be less in the vicinity of KCLT and KHKY. Any convective activity should diminish by 00z or just thereafter. Winds will be light and VRB to calm at most sites thru the morning, with KCLT and KHKY still favoring a light, SWLY wind thru the morning. Winds will pick up from SW (outside the mtns) this aftn and become light and VRB to calm again later tonight. At KAVL, winds will remain calm to light and VRB thru the morning and into the aftn. They will eventually favor more of a NWLY direction later this aftn, but speeds are expected to remain light (less than 5 kts). Outlook: More typical summertime weather is expected thru mid-week, with sct to numerous SHRA/TSRA mainly in the aftn/evening and fog and/or low stratus possible each morning.
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&& .GSP WATCHES/WARNINGS/ADVISORIES... GA...None. NC...None. SC...None. && $$ SYNOPSIS...RWH NEAR TERM...JPT SHORT TERM...RWH LONG TERM...RWH AVIATION...JPT