Colorado River Headwaters (COZ205) - Fire Weather Forecast

Heavy Rainfall Continues in Hawaii; Severe Thunderstorms and Heavy Rainfall in the Plains and Southern Appalachians

Areas of gusty winds, heavy rain leading to flash flooding, and high surf continue across portions of Hawaii as Tropical Storm Lala continues to move away from the islands. Severe thunderstorms and heavy rainfall will shift into the southern Appalachians today. Strong to severe thunderstorms may produce large hail, scattered wind gusts, and heavy rain today across the northern and central Plains. Read More >

COZ205-172345- COZ205-172345- Colorado River Headwaters- 133 AM MDT Mon Aug 17 2026 Fire Weather Planning Forecast for Wrn Colorado and Ern Utah National Weather Service Grand Junction CO 133 AM MDT Mon Aug 17 2026 .DISCUSSION... Showers and thunderstorms are possible over the high terrain during the afternoon today, but wetting rain is unlikely with this activity. On Tuesday and Wednesday a weak frontal boundary will support increased chances of afternoon showers and thunderstorms. However, wetting rain still remains unlikely, but there is a low (15 to 25 percent) chance in localized areas. Marginal wind gusts and relative humidity values will result in only localized critical fire weather conditions this week. ...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 (40-50%). Isolated showers and thunderstorms after 1200. Chc of lightning....0 percent. Max temperature.....76-86 F. Min humidity........11-21%. 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 10 to 15 mph. Mixing Height.......2000 ft AGL until 1000, then 11500 ft AGL. Transport Winds.....West 5 mph. Smoke dispersal.....Poor until 0900. Good after 1200. .TONIGHT... Sky/weather.........Partly cloudy (30-40%). Chc of lightning....0 percent. Min temperature.....51-61 F. Max humidity........41-51%. 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....West 10 to 15 mph increasing to 15 to 20 mph after midnight. Mixing Height.......8500 ft AGL until 2000, then 500 ft AGL. Transport Winds.....West 5 to 10 mph until 2400, then south. Smoke dispersal.....Fair until 2100, then poor. .TUESDAY... Sky/weather.........Partly cloudy (40-50%). Chc of lightning....0 percent. Max temperature.....76-86 F. Min humidity........14-24%. 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 20 to 25 mph. Mixing Height.......1000 ft AGL until 0900. 11500 ft AGL after 1000. Transport Winds.....West 5 to 10 mph. Smoke dispersal.....Poor until 0900. Very good after 1200. .FORECAST FOR DAY 3 THROUGH 7... .WEDNESDAY...Partly cloudy. Scattered showers and thunderstorms. Lows 48-58. Highs 74-84. Winds less than 15 mph. .THURSDAY...Mostly clear. Isolated showers and thunderstorms. Lows 48-58. Highs 77-87. Winds less than 15 mph. .FRIDAY...Mostly clear. Isolated showers and thunderstorms. Lows 49-59. Highs 79-89. Winds less than 15 mph. .SATURDAY...Partly cloudy. Scattered showers and thunderstorms. Lows 50-60. Highs 77-87. .SUNDAY...Partly cloudy. Scattered showers and thunderstorms. Lows 49-59. Highs 73-83.