FNUS71 KLWX 211919 FWSLWX Spot Forecast for Black Line North River...USFS National Weather Service Baltimore MD/Washington DC 319 PM EDT Sat Mar 21 2026 Forecast is based on ignition time of 1600 EDT on March 21. If conditions become unrepresentative...contact the National Weather Service. Please contact our office if you have questions or concerns with this forecast. .DISCUSSION... High pressure will return with continued above average temperatures this weekend. A stronger cold front will bring the next chance of showers and thunderstorms Sunday evening into Sunday night. Cooler weather returns by early next week as Canadian high pressure approaches from the west. .REST OF TODAY... Sky/weather.........Mostly sunny (25-35 percent). CWR.................0 percent. Chance of thunder...0 percent. Max temperature.....Around 67. Min humidity........34 percent. Wind (20 ft)........Southwest winds 4 to 8 mph. Mixing height.......6100 ft AGL. Transport winds.....West 13 to 14 mph. Smoke dispersal.....Excellent (65400 knot-ft). TIME (EDT) 4 PM Sky (%).........30 Weather cov..... Weather type....NONE Tstm cov........ CWR.............0 Chc of thdr (%).0 Temp............67 RH..............34 20 ft wind......SW 6 20 ft wind gust.14 Mix hgt (ft)....5900 Transport wind..W 13 Vrate kt-ft/1K..65 Ventrate Cat....GOOD .TONIGHT... Sky/weather.........Mostly clear (20-30 percent). CWR.................0 percent. Chance of thunder...0 percent. Min temperature.....Around 48. Max humidity........80 percent. Wind (20 ft)........West winds 6 to 8 mph. Mixing height.......200 ft AGL. Transport winds.....Southwest 7 to 14 mph. Smoke dispersal.....Good (49400 knot-ft) early in the evening decreasing to poor (1100 knot-ft) late in the night. TIME (EDT) 6 PM 8 PM 10 PM MIDNGT 2 AM 4 AM Sky (%).........36 27 28 18 10 30 Weather cov..... Weather type....NONE NONE NONE NONE NONE NONE Tstm cov........ CWR.............0 0 0 0 0 0 Chc of thdr (%).0 0 0 0 0 0 Temp............64 58 53 50 49 49 RH..............37 53 59 66 68 71 20 ft wind......SW 6 W 6 W 6 W 6 W 6 W 7 20 ft wind gust.14 13 13 14 16 17 Mix hgt (ft)....4100 200 200 200 200 200 Transport wind..W 14 W 8 W 7 SW 8 SW 10 SW 12 Vrate kt-ft/1K..49 1 1 1 1 2 Ventrate Cat....FAIR POOR POOR POOR POOR POOR .SUNDAY... Sky/weather.........Mostly sunny (30-40 percent). CWR.................0 percent. Chance of thunder...3 percent. Max temperature.....Around 77. Min humidity........40 percent. Wind (20 ft)........West winds 7 to 14 mph. Gusts up to 30 mph. Mixing height.......5200 ft AGL. Transport winds.....West 12 to 22 mph increasing to 24 to 28 mph late in the afternoon. Smoke dispersal.....Poor (2300 knot-ft) early in the morning increasing to excellent (84900 knot-ft) in the afternoon increasing to excellent (105100 knot-ft) late in the afternoon. TIME (EDT) 6 AM 9 AM NOON 3 PM Sky (%).........31 21 33 48 Weather cov..... Weather type....NONE NONE NONE NONE Tstm cov........ CWR.............0 0 0 0 Chc of thdr (%).0 00 0 Temp............50 56 71 77 RH..............74 72 49 40 20 FT wind......W 8G18 W 10G22 W 13G28 W 14G29 Mix hgt (ft)....200 300 2300 5000 Transport wind..W 14 W 16 W 21 W 24 Vrate kt-ft/1K..2 4 42 105 Ventrate Cat....POOR POOR FAIR VYGD $$ Forecaster...Witt Requested by...Aaron Strobel Type of request...PRESCRIBED .TAG 2607006.0/LWX .DELDT 03/21/26 .FormatterVersion 2.0.0 .EMAIL james.colten@usda.gov,colten.moor@usda.gov,ted.docev@usda.gov,aaron.p.strobel@usda.gov