COZ205-210030-
COZ205-210030-
Colorado River Headwaters-
229 AM MDT Wed May 20 2026

Fire Weather Planning Forecast for Wrn Colorado and Ern Utah
National Weather Service Grand Junction CO
229 AM MDT Wed May 20 2026

.DISCUSSION...

A chance for isolated showers and thunderstorms will continue for
the mountains, favoring areas south of I-70 Wednesday. Wetting 
rains are not expected. A disturbance will bring greater chances 
of wetting rain and thunderstorms to northwest CO and northeast UT
Thursday. Increased winds and a frontal passage will keep more 
widespread critical fire weather conditions in place for southwest 
CO Thursday into Saturday, before lighter winds return Sunday.

...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 and 
                    thunderstorms. 
Chc of lightning....20 percent. 
Max temperature.....53-63 F. 
Min humidity........20-30%. 
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 30 mph decreasing to 20 to 25 
                    mph in the afternoon. 
Mixing Height.......1500 ft AGL until 0900, then 9500 ft AGL. 
Transport Winds.....Southwest 5 to 10 mph until 1200, then west 15 
                    to 20 mph. 
Smoke dispersal.....Poor until 0900. Very good after 1200. 

.TONIGHT...
Sky/weather.........Mostly clear (20-30%). 
Chc of lightning....0 percent. 
Min temperature.....28-38 F. 
Max humidity........58-73%. 
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 20 to 25 mph. 
Mixing Height.......7000 ft AGL until 2000, then 1000 ft AGL. 
Transport Winds.....Northwest 5 to 10 mph until 2400, then 
                    southeast. 
Smoke dispersal.....Fair until 2100, then poor. 

.THURSDAY...
Sky/weather.........Partly cloudy (50-60%) until 1200, then mostly 
                    cloudy (70-80%). Isolated showers and 
                    thunderstorms after 1200. 
Chc of lightning....10 percent. 
Max temperature.....56-66 F. 
Min humidity........20-30%. 
20-foot winds.......Downslope/downvalley winds 4 to 8 mph becoming 
                    west 10 to 15 mph with gusts to 30 mph in the 
                    afternoon. 
CWR.................10 percent. 
15K Ft MSL Winds....Southwest 20 to 30 mph. 
Mixing Height.......500 ft AGL until 0800. 8000 ft AGL after 0900. 
Transport Winds.....Southwest 5 to 10 mph until 1200, then west 15 
                    to 20 mph. 
Smoke dispersal.....Poor until 0900, then good until 1200, then 
                    excellent until 1500, then very good. 

.FORECAST FOR DAY 3 THROUGH 7...
.FRIDAY...Mostly cloudy. Scattered showers and isolated
thunderstorms. Lows 29-39. Highs 53-63. Winds less than 15 mph. 
.SATURDAY...Partly cloudy. Isolated showers and thunderstorms.
Lows 30-40. Highs 59-69. Winds less than 15 mph. 
.SUNDAY...Mostly clear. Isolated showers and thunderstorms. Lows
32-42. Highs 66-76. Winds less than 15 mph. 
.MEMORIAL DAY...Mostly clear. Isolated showers and thunderstorms.
Lows 36-46. Highs 70-80. 
.TUESDAY...Partly cloudy. Scattered showers and thunderstorms.
Lows 38-48. Highs 64-74.