FNUS74 KMRX 211901 FWSMRX Spot Forecast for Grandfather Knob...USFS National Weather Service Morristown TN 301 PM EDT Sat Mar 21 2026 Forecast is based on ignition time of 0600 EDT on March 22. If conditions become unrepresentative,contact the National Weather Service...at 1-800-697-0075. If possible, please provide feedback for every spot forecast request. .DISCUSSION... ...Widely Scattered to Scattered Storms This Evening... Spring-like temperatures will continue through Sunday along with Smoky conditions. Widely scattered showers and thunderstorms this evening with dry and unseasonably warm conditions Sunday. A weak frontal boundary will move across the region Sunday night into early Monday morning producing a chance of rain showers mainly north of interstate 40. Seasonally cooler and dry conditions for early next week. .SUNDAY... Sky/weather.........Mostly sunny (30-40 percent). TIME (EDT) 6AM 7AM 8AM 9AM 10A 11A 12P 1PM 2PM 3PM 4PM 5PM Sky (%).........54 55 55 42 44 43 41 30 20 20 16 36 Weather cov..... Weather type.... Tstm cov........ .SUNDAY NIGHT... Sky/weather.........Partly cloudy (20-30 percent) then becoming mostly cloudy (65-75 percent). Chance of showers overnight. TIME (EDT) 6PM 7PM 8PM 9PM 10P 11P MID 1AM 2AM 3AM 4AM 5AM Sky (%).........28 33 23 14 19 24 29 35 40 56 71 87 Weather cov..... CHC CHC CHC CHC Weather type.... RW RW RW RW Tstm cov........ .MONDAY... Sky/weather.........Mostly cloudy (70-80 percent) then becoming sunny (20-30 percent). Chance of rain showers early in the morning. Max temperature.....Around 61. Min humidity........40 percent. Wind (20 ft)........West winds 6 to 7 mph with gusts to around 17 mph shifting to the northwest around 6 mph in the late morning and afternoon. Mixing height.......4400 ft AGL. Transport winds.....Northwest 15 to 20 mph shifting to the north 12 to 14 mph in the late morning and afternoon. Rainfall amount.....0.03 inches. TIME (EDT) 6AM 7AM 8AM 9AM 10A 11A 12P 1PM 2PM 3PM 4PM 5PM Sky (%).........88 89 90 85 80 75 59 43 27 20 14 7 Weather cov.....CHC CHC Weather type....RW RW Tstm cov........ Temp............60 58 57 56 57 57 57 58 59 59 60 59 RH..............87 93 93 93 86 80 75 64 55 49 44 42 20 FT wind dir..W W W NW NW NW NW NW NW NW NW NW 20 FT wind spd..7 7 6 6 6 6 6 6 6 6 6 6 20 FT wind gust.17 14 14 13 13 13 13 12 12 12 12 12 Mix hgt (kft)...2.4 2.2 2.0 2.1 2.3 2.6 3.0 3.4 3.8 4.2 4.4 4.3 Transp wind dir.W NW NW N N N N N N N N N Transp wind spd.20 17 15 14 13 12 12 13 13 13 13 13 $$ Forecaster...David Hotz Requested by...Maxwell White Type of request...PRESCRIBED .TAG 2606875.1/MRX .DELDT 03/21/26 .FormatterVersion 2.0.0 .EMAIL maxwell.white@usda.gov