Colorado River Headwaters (COZ205) - Fire Weather Forecast

Severe Thunderstorms and Heavy Rain in the Mid-Atlantic; Heat Persists Across the South

Scattered severe thunderstorms and excessive rainfall are possible into the night in the Mid Atlantic, and heavy rain will shift to Virginia and the Carolinas on Friday. Severe thunderstorms are also possible in the Central Plains into the Upper MS Valley and the Deep South tonight. Dangerous heat persists across the Southern Plains and Lower MS Valley and heat will expand into the Southwest. Read More >

COZ205-210145- COZ205-210145- Colorado River Headwaters- 335 AM MDT Thu Aug 20 2026 Fire Weather Planning Forecast for Wrn Colorado and Ern Utah National Weather Service Grand Junction CO 335 AM MDT Thu Aug 20 2026 .DISCUSSION...Hot and dry conditions continue in the valleys with isolated afternoon thunderstorms over the higher terrain today and tomorrow with more scattered coverage in the San Juans. Lighter winds will limit critical fire weather. Monsoonal moisture moves in through the weekend bringing more widespread storm coverage and heavier precipitation Saturday onward. Expect increased risks for flash flooding and debris flows near recent fire scars. ...GUSTY ERRATIC WINDS CAN BE EXPECTED NEAR ANY SHOWERS OR THUNDERSTORMS... ...THE SMOKE DATA IS CALCULATED FROM AN AVERAGE AT 6000 FEET MSL... .TODAY... Sky/weather.........Mostly sunny (10-20%) until 1200, then partly cloudy (30-40%). Isolated showers and thunderstorms after 1200. Chc of lightning....10 percent. Max temperature.....81-91 F. Min humidity........13-23%. 20-foot winds.......Downslope/downvalley 3 to 6 mph becoming upslope/upvalley 4 to 8 mph by 1100. CWR.................0 percent. 15K Ft MSL Winds....Northwest 15 to 20 mph decreasing to 10 to 15 mph in the afternoon. Mixing Height.......1500 ft AGL until 1000, then 11000 ft AGL. Transport Winds.....West 5 mph until 1200, then northwest. Smoke dispersal.....Poor until 0900. Good after 1200. .TONIGHT... Sky/weather.........Partly cloudy (30-40%). Chc of lightning....0 percent. Min temperature.....53-63 F. Max humidity........50-60%. 20-foot winds.......Upslope/upvalley 4 to 8 mph becoming downslope/downvalley 3 to 6 mph by sunset. CWR.................0 percent. 15K Ft MSL Winds....North 5 to 10 mph shifting to the west after midnight. Mixing Height.......9000 ft AGL until 1900. 500 ft AGL after 2000. Transport Winds.....North 5 to 10 mph until 2400, then southeast. Smoke dispersal.....Poor. .FRIDAY... Sky/weather.........Mostly sunny (20-30%) until 1200, then partly cloudy (40-50%). Isolated showers and thunderstorms after 1200. Chc of lightning....20 percent. Max temperature.....82-92 F. Min humidity........12-22%. 20-foot winds.......Downslope/downvalley 3 to 6 mph becoming upslope/upvalley 4 to 8 mph by 1100. CWR.................10 percent. 15K Ft MSL Winds....Northwest 5 to 10 mph. Mixing Height.......1500 ft AGL until 1000. 11500 ft AGL after 1200. Transport Winds.....Southwest 5 mph until 1200, then northwest. Smoke dispersal.....Poor until 0900. Good after 1200. .FORECAST FOR DAY 3 THROUGH 7... .SATURDAY...Partly cloudy. Numerous showers and scattered thunderstorms. Lows 51-61. Highs 78-88. Winds less than 15 mph. .SUNDAY...Partly cloudy. Scattered showers and thunderstorms. Lows 48-58. Highs 74-84. Winds less than 15 mph. .MONDAY...Partly cloudy. Scattered showers and thunderstorms. Lows 48-58. Highs 74-84. Winds less than 15 mph. .TUESDAY...Partly cloudy. Scattered showers and thunderstorms. Lows 47-57. Highs 74-84. .WEDNESDAY...Partly cloudy. Scattered showers and thunderstorms. Lows 47-57. Highs 74-84.