FNUS72 KGSP 201233 FWSGSP Spot Forecast for Old Hwy 105...USFS National Weather Service Greenville-Spartanburg SC 833 AM EDT Wed May 20 2026 Forecast is based on forecast start time of 0900 EDT on May 20. If conditions become unrepresentative...contact the National Weather Service. .DISCUSSION... Warm and mainly dry conditions today with minimum relative humidity values expected to fall into the 35-45% range. A couple isolated showers cannot be completely ruled out this afternoon. A cooler and wetter pattern returns Thursday and persists through the weekend and into early next week. Humidity values will be much higher along with daily chances for showers and thunderstorms along with noticeably cooler temperatures and more widespread and persistent cloud cover. Rain chances over the next 10 days are high and confidence in 0.25" of rain in the next 72 hour is also moderate to high. .REST OF TODAY... Sky/weather.........Sunny (15-25 percent) then becoming partly sunny (45-55 percent). Slight chance of showers and thunderstorms early in the afternoon. Chance of showers and thunderstorms late in the afternoon. Chance of thunder...30 percent. Max temperature.....Around 82. Min humidity........39 percent. Wind (20 ft)........Light winds. Gusty and erratic winds expected near thunderstorms late in the afternoon. Mixing height.......7700 ft AGL. Transport winds.....West around 6 mph shifting to the southwest 7 to 13 mph in the afternoon. Smoke dispersal.....Poor (8171 mph-ft) early in the morning increasing to excellent (79064 mph-ft) in the afternoon. LVORI...............2. ADI.................11 early in the morning increasing to 96 in the afternoon. Stability class.....1. Pcpn amount.........0.02 inches. Ceiling (FT)........23100 decreasing to 5900 late in the afternoon. Visibility (SM).....9. Sfc pressure (in)...27.8. TIME (EDT) 9AM 10A 11A 12P 1PM 2PM 3PM 4PM 5PM Sky (%).........3 1 1 4 8 38 40 54 50 Weather cov..... SCH SCH CHC CHC Weather type.... RW RW RW RW Tstm cov........ SCH SCH CHC CHC Chc of thdr (%).0 0 0 0 10 20 20 30 30 Temp............73 76 78 80 81 81 82 81 80 Dewpoint........55 55 55 54 54 54 56 56 57 RH..............54 49 45 41 40 39 41 43 45 20 FT wind dir..W W SW SW S S S SW SW 20 FT wind spd..2 2 2 2 2 3 3 3 3 20 FT wind gust.6 6 7 7 8 9 9 9 10 Mix hgt (kft)...1.4 3.4 4.8 6.1 7.1 7.7 7.5 7.2 6.2 Transp wind dir.W W SW SW SW SW SW SW SW Transp wind spd.6 6 6 7 8 8 10 10 13 LVORI...........2 2 1 1 1 1 1 1 1 ADI.............11 25 34 51 69 73 91 88 96 VRate mph-ft/1k.8 20 28 42 58 62 77 74 79 Ceiling (hft)...239 240 231 250 250 250 250 250 59 Visibility (sm).9 9 9 9 9 9 9 9 9 Sfc pres (in)...793 793 792 790 788 785 783 781 780 .TONIGHT... Sky/weather.........Partly cloudy (35-45 percent) then becoming mostly cloudy (55-65 percent). Slight chance of thunderstorms early in the evening. Slight chance of showers early in the evening. Chance of thunder...20 percent. Min temperature.....Around 66. Max humidity........76 percent. Wind (20 ft)........Light winds early in the evening becoming southwest around 5 mph, then shifting to the northwest 5 to 6 mph in the late evening and overnight becoming light. Gusty and erratic winds expected near thunderstorms early in the evening. Mixing height.......400 ft AGL. Transport winds.....Southwest 9 to 13 mph shifting to the northwest 5 to 10 mph in the late evening and overnight. Smoke dispersal.....Excellent (60190 mph-ft) early in the evening decreasing to poor (1956 mph-ft) late in the night. LVORI...............3. ADI.................75 early in the evening decreasing to 2 late in the night. Stability class.....3. Pcpn amount.........0.01 inches. Ceiling (FT)........5600 increasing to 17100 early in the evening, then decreasing to 8800 in the late evening and overnight. Visibility (SM).....8. Sfc pressure (in)...27.8. TIME (EDT) 6PM 7PM 8PM 9PM 10P 11P MID 1AM 2AM 3AM 4AM 5AM Sky (%).........45 36 43 57 49 44 62 54 70 69 53 55 Weather cov.....SCH SCH SCH SCH Weather type....RW RW RW RW Tstm cov........SCH SCH SCH Chc of thdr (%).20 20 20 10 10 10 10 10 10 0 10 0 Temp............79 77 74 74 73 71 70 69 68 68 67 67 Dewpoint........57 58 59 59 59 61 61 60 60 59 59 59 RH..............47 51 59 59 61 69 73 75 76 75 76 75 20 FT wind dir..S SW SW NW NW NW NW NW W NW N S 20 FT wind spd..3 5 5 6 6 6 5 5 5 3 2 2 20 FT wind gust.10 10 10 10 10 9 8 8 7 7 6 6 Mix hgt (kft)...4.8 2.2 0.6 0.5 0.5 0.5 0.4 0.5 0.5 0.4 0.4 0.4 Transp wind dir.SW SW SW W NW NW NW NW NW NW NW NW Transp wind spd.13 10 9 9 10 10 10 8 7 6 5 5 LVORI...........1 2 3 3 3 3 3 4 4 4 4 4 ADI.............75 5 4 6 7 7 7 5 5 3 2 2 VRate mph-ft/1k.60 23 6 4 5 5 5 4 3 3 2 2 Ceiling (hft)...58 56 200 171 125 109 105 101 97 94 91 88 Visibility (sm).9 9 9 9 9 9 9 9 9 9 8 8 Sfc pres (in)...780 782 783 784 785 785 785 784 784 784 784 784 .THURSDAY... Sky/weather.........Partly sunny (50-60 percent) then becoming cloudy (90-100 percent). Chance of showers and thunderstorms in the morning, then showers and thunderstorms in the afternoon. Chance of thunder...90 percent. Max temperature.....Around 76. Min humidity........61 percent. Wind (20 ft)........Light winds. Gusty and erratic winds expected near thunderstorms in the late morning and afternoon. Mixing height.......4200 ft AGL. Transport winds.....North 5 to 6 mph shifting to the east 5 to 7 mph late in the morning, then shifting to the south 7 to 8 mph late in the morning shifting to the northwest 8 to 9 mph late in the afternoon. Smoke dispersal.....Poor (1956 mph-ft) early in the morning increasing to good (33950 mph-ft) in the afternoon. LVORI...............3. ADI.................3 to 40. Stability class.....3. Pcpn amount.........0.18 inches. Ceiling (FT)........8000 decreasing to 2800 in the late morning and afternoon. Visibility (SM).....8. Sfc pressure (in)...27.83. TIME (EDT) 6AM 7AM 8AM 9AM 10A 11A 12P 1PM 2PM 3PM 4PM 5PM Sky (%).........54 65 43 53 52 54 65 68 90 94 95 98 Weather cov..... SCH CHC SCH CHC DEF DEF DEF LKY Weather type.... RW RW RW RW RW RW RW RW Tstm cov........ SCH CHC SCH CHC DEF DEF DEF LKY Chc of thdr (%).0 0 0 10 20 30 20 50 80 90 90 60 Temp............67 67 69 71 71 73 75 74 75 73 72 71 Dewpoint........58 59 59 60 60 60 61 61 62 64 64 64 RH..............75 75 72 69 69 64 61 63 64 73 77 78 20 FT wind dir..N N N E SE SE SE S S SW W N 20 FT wind spd..1 1 0 1 2 2 2 2 2 2 1 1 20 FT wind gust.5 3 3 5 6 7 7 7 7 8 7 7 Mix hgt (kft)...0.4 0.4 0.6 1.7 2.3 3.3 3.9 4.2 2.7 0.7 0.6 1.4 Transp wind dir.NW N N E E SE SE S S W NW NW Transp wind spd.6 5 5 5 7 7 7 8 7 9 8 8 LVORI...........4 4 3 3 3 2 1 1 2 3 4 4 ADI.............3 4 4 10 20 28 33 40 23 10 8 15 VRate mph-ft/1k.3 2 3 8 16 23 27 34 18 7 5 12 Ceiling (hft)...85 82 80 82 37 36 34 32 31 29 29 28 Visibility (sm).8 8 8 8 8 9 9 9 9 9 9 9 Sfc pres (in)...785 786 787 788 788 788 787 786 785 784 783 783 $$ Forecaster...TBW Requested by...Alan Huskins Type of request...WILDFIRE .TAG 2614103.0/GSP .DELDT 05/20/26 .FormatterVersion 2.0.0