Colorado River Headwaters (COZ205) - Fire Weather Forecast

Thunderstorms and Heavy Rains in the Appalachians

Multiple rounds of moderate to locally heavy rain will impact portions of the Appalachians and Mid-Atlantic, which may lead to flash flooding concerns. Thunderstorms with isolated severe wind gusts will be possible this afternoon from parts of the Southeast into the southern and central Appalachians. A multi-day heavy rain will pose a flash flood threat in New Mexico beginning Tuesday. Read More >

COZ205-212315- COZ205-212315- Colorado River Headwaters- 103 AM MDT Mon Sep 21 2026 Fire Weather Planning Forecast for Wrn Colorado and Ern Utah National Weather Service Grand Junction CO 103 AM MDT Mon Sep 21 2026 .DISCUSSION... Monday marks the driest day of the upcoming week with minimum relative humidities generally around 20-25% in valleys and 30-40% over the high terrain. This combined with relatively light winds means little to no threat of critical fire weather conditions. Look for daily precipitation chances beginning Tuesday and lasting into the weekend. ...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%). Chc of lightning....0 percent. Max temperature.....62-72 F. Min humidity........17-27%. 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....West 15 to 20 mph. Mixing Height.......1000 ft AGL until 1000, then 7500 ft AGL. Transport Winds.....South 5 mph until 1200, then west. Smoke dispersal.....Poor until 0900. Good after 1200. .TONIGHT... Sky/weather.........Partly cloudy (30-40%). Chc of lightning....0 percent. Min temperature.....38-48 F. Max humidity........57-67%. 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....Southwest 15 to 20 mph. Mixing Height.......4500 ft AGL until 1900, then 1000 ft AGL. Transport Winds.....Southwest 5 mph until 2400, then southeast. Smoke dispersal.....Poor. .TUESDAY... Sky/weather.........Mostly sunny (20-30%) until 1200, then partly cloudy (40-50%). Scattered showers and isolated thunderstorms after 1200. Chc of lightning....20 percent. Max temperature.....62-72 F. Min humidity........26-36%. 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....Southwest 20 to 25 mph. Mixing Height.......1500 ft AGL until 1000, then 7000 ft AGL. Transport Winds.....Southwest 5 to 10 mph. Smoke dispersal.....Poor until 1200, then very good until 1500, then good. .FORECAST FOR DAY 3 THROUGH 7... .WEDNESDAY...Mostly cloudy. Scattered showers and isolated thunderstorms. Lows 40-50. Highs 58-68. Winds less than 15 mph. .THURSDAY...Partly cloudy. Scattered showers and thunderstorms. Lows 40-50. Highs 59-69. Winds less than 15 mph. .FRIDAY...Partly cloudy. Scattered showers and thunderstorms. Lows 40-50. Highs 58-68. Winds less than 15 mph. .SATURDAY...Partly cloudy. Isolated showers and thunderstorms. Lows 40-50. Highs 62-72. .SUNDAY...Partly cloudy. Scattered showers and isolated thunderstorms. Lows 40-50. Highs 59-69.