Area Forecast Discussion
Issued by NWS Greer, SC
Issued by NWS Greer, SC
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881 FXUS62 KGSP 220238 AFDGSP Area Forecast Discussion National Weather Service Greenville-Spartanburg SC 938 PM EST Thu Nov 21 2024 .SYNOPSIS... Deep low pressure will pass across the Great Lakes into the weekend, resulting in gusty northwest winds that will bring snow showers to portions of the mountains through Saturday morning. As low pressure departs on Saturday, high pressure will arrive from the west that will bring a gradual warming trend into the early part of next week. && .NEAR TERM /THROUGH FRIDAY/... As of 935 PM EST Thursday: Widespread snow showers moving into the NC mountains as seen on regional radar and obs. These will scatter out before another round of snow showers move in after midnight. Cloudy and windy conditions will continue across most of the rest of the NC mountains. Winds are slowly diminishing outside of the mountains but gusts will linger in a few locations overnight. Temps are running a little warmer than expected but should cool to forecast lows by morning. Snow accums and Winter Wx Advisory on track. Through this evening, chances for snow shower activity will increase as moisture off of Lake Michigan arrives. Snow shower activity will start off as light on-and-off bands this afternoon and evening. The heavier bands will arrive after sunset and will persist through the night, which is when the highest accumulations will occur. With high pressure moving in from the west on Friday, snow shower activity will begin to diminish, though flurries flying through the air will remain possible into Friday evening. No changes at this time with the current Winter Weather Advisory. Snow will diminish quickly further east of the advisory area in the downslope windflow. The other concern through the period will be gusty winds given the passage of deep low pressure across the Great Lakes region through Friday. Speeds will diminish somewhat by sunset across the Piedmont to 10 mph or less, but will remain gusty west of the Blue Ridge, possibly to 40 mph in a few spots, as another wave of energy passes across the Appalachians tonight. The arrival of chilly Canadian air will push temperatures tonight generally into the low to mid 20s for areas west of the Blue Ridge, while lows further east will hold in the low to mid 30s. Expect cooler temperatures on Friday as well, again due to the passage of upper level low pressure. Friday afternoon highs will reach into the upper 40s to mid 50s east of the Blue Ridge, but will hold in the low 40s to the 30s further west, even struggling to reach above freezing in spots. && .SHORT TERM /FRIDAY NIGHT THROUGH SUNDAY/... As of 200 PM EST Thursday: Period starts off Friday night with lingering enhanced NW gradient winds and some continued chances of upslope snow showers on the SW extent of the departing strong upper low and wrap-around moisture field mainly impacting the Blue Ridge. This should be tapering off by Saturday morning as ridging builds in under NW flow aloft and the mountains should gradually scatter out of the cold advection stratocu. Saturday high temps should start to rebound with generally 40s to low 50s in the mountains and upper 50s to low 60s in the Piedmont and with winds becoming more lax by afternoon. Sunday looks quite pleasant as near zonal flow and continued ridging allows for temps to moderate even warmer with many locations in the 60s. && .LONG TERM /SUNDAY NIGHT THROUGH THURSDAY/... As of 230 PM EST Thursday: The next main influencing feature will be an approaching elongated front that loses phase from another upper low centered near the Canadian border. This will allow for increased precip chances later Monday into Tuesday as it pushes south and becomes more moisture starved. With a rather warm airmass though stable the precip type is expected to be just rain this time. QPF values look to be rather light with most locations under a quarter of an inch. There looks to be a shortlived break in precip late Tuesday, then moisture advection kicks in again along the southern stream of the upper flow with zonal to gradual amplification from the west Wednesday into Thursday. Have slight to low chance pops for showers Wednesday then increased chances Thursday. Thermal columns look to remain too warm so expecting the liquid variety in this setup. && .AVIATION /03Z FRIDAY THROUGH TUESDAY/... At KCLT and elsewhere: Clouds moving out of the Piedmont, but some VFR clouds may still break containment and spread across the terminals through the period, especially at KHKY/KCLT Friday afternoon. Low VFR clouds will move up the valley to KAVL this evening with MVFR possible around daybreak. Low VFR then scatters out at KAVL through the afternoon. Can`t rule out some flurries or very light snow showers at KAVL overnight or early Friday, but chance too low for the TAF. W to NW wind with low end gusts this evening diminishes overnight. W to NW winds pick back up after daybreak Friday with gusts redeveloping and continuing into the afternoon. Speeds begin falling by late afternoon. KAVL will see gusty NW winds throughout, with the highest speeds from mid morning to late afternoon Friday. Outlook: VFR outside of the mountains through Monday. KAVL may see some low VFR or MVFR cigs as moisture pushes up the valley through Friday night with VFR returning through Monday. A weak cold front crossing the area Tuesday may bring scattered rain showers and associated restrictions. && .GSP WATCHES/WARNINGS/ADVISORIES... GA...None. NC...Winter Weather Advisory until 7 AM EST Saturday for NCZ033- 048>052. SC...None. && $$ SYNOPSIS...NF NEAR TERM...NF/RWH SHORT TERM...AB LONG TERM...AB AVIATION...RWH