National Weather Service United States Department of Commerce

Heat Wave and Severe Thunderstorms this Independence Day

A prolonged, dangerous heat wave will persist through the Independence Day weekend across the Ohio Valley, Midwest, and Mid-Atlantic. Numerous temperature records are expected. Clusters of severe thunderstorms will move across parts of the Allegheny Plateau into Mid Atlantic this Independence Day, with potential for widespread damaging winds. Additional severe thunderstorms in the Great Plains. Read More >

COZ205-051100-
COZ205-051100-
Colorado River Headwaters-
1250 PM MDT Sat Jul 4 2026

Fire Weather Planning Forecast for Wrn Colorado and Ern Utah
National Weather Service Grand Junction CO
1250 PM MDT Sat Jul 4 2026

.DISCUSSION...Lighter winds will remain in place today and beyond
helping to ease critical fire weather concerns although localized
conditions will still occur at times. Hot and dry conditions will
persist even as mid level moisture increases late Sunday through
early next week. As a result, isolated showers and thunderstorms
will be present over the high terrain, increasing in coverage
Monday and Tuesday. This will threaten new lightning starts and
erratic fire behavior around gusty outflows.

...GUSTY ERRATIC WINDS CAN BE EXPECTED NEAR ANY SHOWERS
OR THUNDERSTORMS...
...THE SMOKE DATA IS CALCULATED FROM AN AVERAGE AT 6000 FEET MSL...


.TONIGHT...
Sky/weather.........Partly cloudy (30-40%) until 2400, then clear 
                    (0-10%). Patchy smoke. 
Chc of lightning....0 percent. 
Min temperature.....49-59 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....Northwest 5 to 10 mph. 
Mixing Height.......12000 ft AGL until 2000, then 1000 ft AGL. 
Transport Winds.....North 5 to 10 mph until 2400, then east. 
Smoke dispersal.....Good until 2100, then poor. 

.SUNDAY...
Sky/weather.........Mostly sunny (10-20%) until 1200, then partly 
                    cloudy (30-40%). Patchy smoke. Isolated showers 
                    and thunderstorms after 1200. 
Chc of lightning....0 percent. 
Max temperature.....79-89 F. 
Min humidity........7-12%. 
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....West 5 to 10 mph shifting to the southwest in 
                    the afternoon. 
Mixing Height.......1000 ft AGL until 0900. 14000 ft AGL after 
                    1000. 
Transport Winds.....Southeast 5 mph until 1200, then west. 
Smoke dispersal.....Poor until 0900. Good after 1200. 

.SUNDAY NIGHT...
Sky/weather.........Partly cloudy (30-40%). Patchy smoke. 
Chc of lightning....0 percent. 
Min temperature.....52-62 F. 
Max humidity........39-49%. 
20-foot winds.......Downslope/downvalley winds 3 to 6 mph. 
                    Localized gusts up to 20 mph in the evening. 
CWR.................0 percent. 
15K Ft MSL Winds....West 5 to 10 mph. 
Mixing Height.......11500 ft AGL until 2000, then 1000 ft AGL. 
Transport Winds.....West 5 to 10 mph until 2400, then southeast. 
Smoke dispersal.....Fair until 2100, then poor. 

.MONDAY...
Sky/weather.........Partly cloudy (40-50%). Patchy smoke until 
                    1200. 
Chc of lightning....0 percent. 
Max temperature.....79-89 F. 
Min humidity........10-15%. 
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 5 to 10 mph. 
Mixing Height.......500 ft AGL until 0800. 13500 ft AGL after 1100. 
Transport Winds.....Southwest 5 mph. 
Smoke dispersal.....Poor until 0900. Very good after 1200. 

.FORECAST FOR DAY 3 THROUGH 7...
.TUESDAY...Partly cloudy. Scattered showers and thunderstorms.
Lows 49-59. Highs 77-87. Winds less than 15 mph. 
.WEDNESDAY...Partly cloudy. Scattered showers and thunderstorms.
Lows 49-59. Highs 79-89. Winds less than 15 mph. 
.THURSDAY...Mostly clear. Isolated showers and thunderstorms.
Lows 48-58. Highs 79-89. Winds less than 15 mph. 
.FRIDAY...Mostly clear. Lows 48-58. Highs 82-92. 
.SATURDAY...Clear. Lows 49-59. Highs 86-96.