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Area Forecast Discussion
Issued by NWS Greer, SC
Issued by NWS Greer, SC
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932 FXUS62 KGSP 020553 AFDGSP Area Forecast Discussion National Weather Service Greenville-Spartanburg SC 153 AM EDT Tue Jul 2 2024 .SYNOPSIS... Drier and cooler high pressure continues over the region through Tuesday. As this high moves off the East Coast middle of the week, temperatures will warm back up again Wednesday into Thursday. Expect increasingly hot and humid conditions going into the weekend with some scattered afternoon and evening showers and storms, especially in the mountains. && .NEAR TERM /THROUGH TODAY/... As of 150 AM EDT Tuesday...Fair weather will continue for the rest of the overnight, but a pesky cloud deck has developed underneath the inversion in the vicinity of the Blue Ridge Escarpment. The extra cloud cover will probably keep temps a bit warmer underneath, impacting the lows. Otherwise, a 1028 mb sfc high will drift east from the Great Lakes to the New England Coast through Tuesday. Dry NE`ly flow around this high will continue to lower dewpoints across the forecast area, while the 850 mb flow veers E`ly, then SE`ly through the period. This dry air advection should preclude fog development overnight. Enough moisture within that flow may keep some stratocu around, especially over the southern half of the forecast area and near the Blue Ridge Escarpment. Lows will be slightly below normal (despite some overhead cloud cover), mainly in the 60s. Tuesday looks like a quiet and pleasant day for early July, as dewpoints dip into the 50s for most of the area, with highs ending up around 5 degrees below climo. This will bring some much needed relief from the heat, albeit brief, but we will take what we can get! && .SHORT TERM /TONIGHT THROUGH THURSDAY/... As of 155 PM Monday: Synoptically, high pressure continues to amplify over the south and sets the stage for many days of warming. Height rises max out by Thursday and remain stout through the period. Guidance from the GFS develops an extremely weak shortwave to the north of the CWA on Thursday and attempts to bring a very small amount of DPVA near the mountains. However, this is not depicted in any other model and given the strong area of high pressure, confidence for any shower development is very low. Moisture, in at least the mid levels, looks to start returning Wednesday night into Thursday as the anticyclonic flow advects moisture from the Gulf. As for any fire concerns, these should start to decrease through the period. Wednesday looks to have a well mixed BL, but with less mid level dry air than Tuesday. RH values should remain in the upper 40 to 50 percent range. Winds will also be light. The main concern is drier vegetation, especially in the NC Piedmont and NE GA zones. Highs on Wednesday will struggle to reach the low 90s in the southern portion of the CWA. But, Thursday high temps start ramping up as the high amplifies. The heat index could also reach the low 100s as the influx of moisture returns to the area. && .LONG TERM /THURSDAY NIGHT THROUGH MONDAY/... As of 200 PM Monday: Summertime remains alive and well into the extended. Thursday night the strong area of high pressure continues to grow over the southeast, while beginning to be pinched off a bit. Guidance from the GFS/EURO/Canadian all show a developing trough across the upper CONUS that gently pushes the high eastward slightly and turns flow aloft more SW by Saturday. This turning should amplify moisture advection into the south, raising the risk for high heat indices Friday and Saturday. Confidence in triple digit heat index values is increasing, given the persistent height rises and moisture return. Guidance has PWAT values topping the 2 inch mark, setting up a very muggy day for Friday and Saturday. The areas of concern are for areas south of I-85 and the eastern NC Piedmont. Will continue to monitor. By Sunday, the trough to the north could help heights fall a bit and cool the CWA down by a few degrees. This is still too far out to pinpoint or have any confidence in given variations from model guidance. Once moisture returns, there could be an increase in more diurnal convection and shower chances, especially over the mountains. But, at this point, QPF response is minimal and again concentrated over the NC mtns. Low confidence in precipitation making a dent in rainfall needs for the CWA over the next 7 days. && .AVIATION /06Z TUESDAY THROUGH SATURDAY/... At KCLT and elsewhere: VFR through the period at all terminals. There is a pesky stratocu deck that has developed underneath the subsidence inversion along and around the Blue Ridge Escarpment that may impact some terminals with a VFR-level bkn ceiling through daybreak or until some drier air advects into the region. Cloud bases will be generally 040-060. The low clouds are expected to mix out as we warm up Tuesday morning. Wind should be easterly overnight, then with some backing to NE during the day, then veering back to SE as the center of high pressure shifts toward the Mid-Atlantic Coast tonight. Outlook: Dry high pressure remains in place through Wednesday. A return of more typical mid-summer diurnal convection is expected starting on Thursday and will linger into the weekend. && .GSP WATCHES/WARNINGS/ADVISORIES... GA...None. NC...None. SC...None. && $$ SYNOPSIS...AR/DEO NEAR TERM...AR/ARK/PM SHORT TERM...CP LONG TERM...CP AVIATION...PM