
Repeated rounds of showers and thunderstorms could bring a flash flooding threat across the Four Corners region and from the mid-Mississippi Valley into the lower Great Lakes. Hot temperatures and high humidity will continue to challenge daily records from the Southern Plains to the lower Mississippi Valley. Read More >
COZ205-162245-
COZ205-162245-
Colorado River Headwaters-
1244 AM MDT Wed Sep 16 2026
Fire Weather Planning Forecast for Wrn Colorado and Ern Utah
National Weather Service Grand Junction CO
1244 AM MDT Wed Sep 16 2026
.DISCUSSION...Subtropical moisture streaming into the area will
continue to feed shower and thunderstorm activity through the
week. These storms will bring a threat of heavy rainfall and the
potential for excess runoff...especially over recent burn scars.
Widespread wetting rainfall is expected over the next several
days which will eliminate the threat of critical fire weather.
...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 cloudy (70-80%). Isolated thunderstorms
until 1200. Scattered showers. Scattered
thunderstorms after 1200.
Chc of lightning....50 percent.
Max temperature.....66-76 F.
Min humidity........39-49%.
20-foot winds.......Downslope/downvalley 3 to 6 mph becoming
upslope/upvalley 4 to 8 mph by 1100.
CWR.................70 percent.
15K Ft MSL Winds....Southwest 20 to 25 mph decreasing to 15 to 20
mph in the afternoon.
Mixing Height.......2000 ft AGL until 1100, then 5500 ft AGL.
Transport Winds.....Southwest 5 mph.
Smoke dispersal.....Poor until 0900. Fair after 1200.
.TONIGHT...
Sky/weather.........Mostly cloudy (80-90%). Numerous showers and
scattered thunderstorms until 2400, then
showers and isolated thunderstorms.
Chc of lightning....50 percent.
Min temperature.....44-54 F.
Max humidity........81-96%.
20-foot winds.......Upslope/upvalley 4 to 8 mph becoming
downslope/downvalley 3 to 6 mph by sunset.
CWR.................80 percent.
15K Ft MSL Winds....Southeast 10 to 15 mph increasing to south 20
to 30 mph after midnight.
Mixing Height.......1000 ft AGL.
Transport Winds.....Southeast 5 mph.
Smoke dispersal.....Poor.
.THURSDAY...
Sky/weather.........Mostly cloudy (70-80%). Isolated thunderstorms
until 1200. Showers. Scattered thunderstorms
after 1200.
Chc of lightning....50 percent.
Max temperature.....61-71 F.
Min humidity........56-66%.
20-foot winds.......Downslope/downvalley 3 to 6 mph becoming
upslope/upvalley 4 to 8 mph by 1100.
CWR.................80 percent.
15K Ft MSL Winds....Southwest 20 to 30 mph.
Mixing Height.......3500 ft AGL.
Transport Winds.....Southwest 5 mph.
Smoke dispersal.....Poor.
.FORECAST FOR DAY 3 THROUGH 7...
.FRIDAY...Mostly cloudy. Numerous showers and scattered
thunderstorms. Lows 42-52. Highs 63-73. Winds less than 15 mph.
.SATURDAY...Mostly cloudy. Scattered showers and thunderstorms.
Lows 39-49. Highs 61-71. Winds less than 15 mph.
.SUNDAY...Mostly clear. Isolated showers and thunderstorms. Lows
36-46. Highs 61-71. Winds less than 15 mph.
.MONDAY...Mostly clear. Isolated showers and thunderstorms. Lows
35-45. Highs 62-72.
.TUESDAY...Partly cloudy. Scattered showers and thunderstorms.
Lows 36-46. Highs 61-71.