Colorado River Headwaters (COZ205) - Fire Weather Forecast

Thunderstorms and Heavy Rain in the Mid-South; Heat Continues in the Southeast and Southwest

Severe thunderstorms and heavy rain are expected across portions of the mid-Mississippi Valley into the Ohio Valley and portions of Arizona. Dangerous heat persists in the South and Southeast while building into the Southwest. Overnight lows will be so warm that, when combined with oppressive dew points, little-to-no relief from the scorching daytime highs will be available. Read More >

COZ205-192345- COZ205-192345- Colorado River Headwaters- 132 AM MDT Wed Aug 19 2026 Fire Weather Planning Forecast for Wrn Colorado and Ern Utah National Weather Service Grand Junction CO 132 AM MDT Wed Aug 19 2026 .DISCUSSION...Moisture increases across the region through the week as a monsoonal flow sets up. Look for an uptick in isolated to scattered afternoon and evening showers and thunderstorms each day through Friday favoring the higher terrain. Showers and thunderstorms will become more widely scattered to widespread through the weekend the first half of next week. Breezy afternoon winds will be west to northwest with gusts 20-25 mph, becoming lighter going into the weekend. Chances for wetting rains increase Saturday and beyond. ...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 (20-30%) until 1200, then partly cloudy (30-40%). Isolated showers. Isolated thunderstorms after 1200. Chc of lightning....20 percent. Max temperature.....76-86 F. Min humidity........19-29%. 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 20 to 30 mph decreasing to 15 to 20 mph in the afternoon. Mixing Height.......1500 ft AGL until 1000, then 8500 ft AGL. Transport Winds.....West 5 mph until 1200, then 10 to 15 mph. Smoke dispersal.....Poor until 0900. Very good after 1200. .TONIGHT... Sky/weather.........Partly cloudy (30-40%). Isolated showers and thunderstorms until 2400. Chc of lightning....10 percent. Min temperature.....51-61 F. Max humidity........54-64%. 20-foot winds.......Upslope/upvalley 4 to 8 mph becoming downslope/downvalley 3 to 6 mph by sunset. CWR.................10 percent. 15K Ft MSL Winds....Northwest 15 to 20 mph. Mixing Height.......5500 ft AGL until 2000, then 500 ft AGL. Transport Winds.....Northwest 5 to 10 mph until 2400, then south. Smoke dispersal.....Poor. .THURSDAY... Sky/weather.........Mostly sunny (10-20%) until 1200, then partly cloudy (40-50%). Isolated showers and thunderstorms after 1200. Chc of lightning....10 percent. Max temperature.....80-90 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 10500 ft AGL. Transport Winds.....Northwest 5 mph. Smoke dispersal.....Poor until 0900. Good after 1200. .FORECAST FOR DAY 3 THROUGH 7... .FRIDAY...Partly cloudy. Isolated showers and thunderstorms. Lows 49-59. Highs 80-90. Winds less than 15 mph. .SATURDAY...Partly cloudy. Numerous showers and scattered thunderstorms. Lows 51-61. Highs 76-86. Winds less than 15 mph. .SUNDAY...Mostly cloudy. Numerous showers and scattered thunderstorms. Lows 49-59. Highs 73-83. Winds less than 15 mph. .MONDAY...Partly cloudy. Scattered showers and thunderstorms. Lows 48-58. Highs 73-83. .TUESDAY...Partly cloudy. Scattered showers and thunderstorms. Lows 47-57. Highs 73-83.