
Dangerous heat will build across the Southwest U.S. through the end of the week with daytime highs of 110-115°F. Isolated to widely scattered severe storms are expected across parts of the central and southern High Plains, Great Lakes into the Ohio Valley, and parts of the Ozarks to Lower Mississippi Valley today. Read More >
COZ205-262245-
COZ205-262245-
Colorado River Headwaters-
1239 AM MDT Wed Aug 26 2026
Fire Weather Planning Forecast for Wrn Colorado and Ern Utah
National Weather Service Grand Junction CO
1239 AM MDT Wed Aug 26 2026
.DISCUSSION...
Enough moisture remains in the atmosphere to allow isolated
afternoon and early evening convection to continue for the
remainder of the week. The main concerns will be gusty winds and
ligthning though stronger cells may produce some heavy rain at
times. If this occcurs over recent burn scars, flash flooding and
debris flows will also be possible. An uptick in moisture over the
weekend may bring more widespread showers and storms.
...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.........Partly cloudy (40-50%). Isolated showers.
Isolated thunderstorms after 1200.
Chc of lightning....20 percent.
Max temperature.....76-86 F.
Min humidity........15-25%.
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 10 to 15 mph.
Mixing Height.......1500 ft AGL until 1000, then 10000 ft AGL.
Transport Winds.....South 5 mph until 1200, then west.
Smoke dispersal.....Poor until 0900. Good after 1200.
.TONIGHT...
Sky/weather.........Partly cloudy (40-50%). Isolated showers and
thunderstorms until 2400.
Chc of lightning....10 percent.
Min temperature.....50-60 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 10 to 15 mph.
Mixing Height.......6500 ft AGL until 2000, then 500 ft AGL.
Transport Winds.....Northwest 5 to 10 mph until 2400, then
southeast.
Smoke dispersal.....Poor.
.THURSDAY...
Sky/weather.........Partly cloudy (40-50%). Scattered showers and
thunderstorms after 1200.
Chc of lightning....20 percent.
Max temperature.....77-87 F.
Min humidity........15-25%.
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 10 to 15 mph.
Mixing Height.......500 ft AGL until 0900. 10500 ft AGL after 1000.
Transport Winds.....Southwest 5 mph until 1200, then west.
Smoke dispersal.....Poor until 0900. Good after 1200.
.FORECAST FOR DAY 3 THROUGH 7...
.FRIDAY...Partly cloudy. Isolated showers and thunderstorms. Lows
48-58. Highs 77-87. Winds less than 15 mph.
.SATURDAY...Partly cloudy. Scattered showers and thunderstorms.
Lows 49-59. Highs 73-83. Southwest winds 10 to 20 mph with gusts
to 35 mph.
.SUNDAY...Mostly cloudy. Numerous showers and scattered
thunderstorms. Lows 47-57. Highs 67-77. Winds less than 15 mph.
.MONDAY...Mostly cloudy. Scattered showers and thunderstorms.
Lows 45-55. Highs 68-78.
.TUESDAY...Partly cloudy. Scattered showers and thunderstorms.
Lows 45-55. Highs 69-79.