
Severe thunderstorms posing a risk for strong gusts and/or large hail are possible across portions of the northern and central Plains, the Lower Missouri to Lower Ohio Valleys, and across the Mid-Atlantic Thursday afternoon and evening. Excessive rainfall may bring flash and urban flooding over the Mid-Mississippi and Ohio Valleys, and Mid-Atlantic on Thursday. Read More >
COZ205-091100-
COZ205-091100-
Colorado River Headwaters-
1259 PM MDT Wed Jul 8 2026
Fire Weather Planning Forecast for Wrn Colorado and Ern Utah
National Weather Service Grand Junction CO
1259 PM MDT Wed Jul 8 2026
.DISCUSSION...
Isolated showers and thunderstorms will continue this afternoon
on the terrain with wetting rains unlikely. Gusty outflows and
lightning will remain the primary threat to fire crews. This
threat shifts to northwest CO and northeast UT on Thursday
afternoon. Localized critical fire weather conditions will favor
the Four Corners again Thursday. Lighter winds and near record
temperatures arrive this weekend. Widespread critical fire weather
is not expected Saturday and beyond.
...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 (40-50%). Scattered showers and
isolated thunderstorms until 2400, isolated
showers after 2400.
Chc of lightning....20 percent.
Min temperature.....51-61 F.
Max humidity........55-65%.
20-foot winds.......Downslope/downvalley winds 3 to 6 mph.
Localized gusts up to 25 mph in the evening.
CWR.................20 percent.
15K Ft MSL Winds....West 15 to 20 mph.
Mixing Height.......10000 ft AGL until 2000, then 1000 ft AGL.
Transport Winds.....Northeast 5 to 10 mph until 2400, then
southeast.
Smoke dispersal.....Good until 2100, then poor.
.THURSDAY...
Sky/weather.........Mostly sunny (10-20%) until 1200, then partly
cloudy (50-60%). Scattered showers and
thunderstorms after 1200.
Chc of lightning....30 percent.
Max temperature.....78-88 F.
Min humidity........13-23%.
20-foot winds.......Upslope/upvalley winds 4 to 8 mph. Localized
gusts up to 25 mph in the afternoon.
CWR.................20 percent.
15K Ft MSL Winds....West 15 to 20 mph.
Mixing Height.......1000 ft AGL until 0900. 11500 ft AGL after
1100.
Transport Winds.....West 5 to 10 mph.
Smoke dispersal.....Poor until 0900. Excellent after 1200.
.THURSDAY NIGHT...
Sky/weather.........Partly cloudy (30-40%). Isolated showers until
2400.
Chc of lightning....0 percent.
Min temperature.....51-61 F.
Max humidity........48-58%.
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 decreasing to 15 to 20 mph
after midnight.
Mixing Height.......9500 ft AGL until 1900. 1000 ft AGL after 2000.
Transport Winds.....North 5 to 10 mph until 2400, then southeast.
Smoke dispersal.....Fair until 2100, then poor.
.FRIDAY...
Sky/weather.........Partly cloudy (30-40%). Isolated showers and
thunderstorms after 1200.
Chc of lightning....0 percent.
Max temperature.....80-90 F.
Min humidity........10-15%.
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 10 to 15 mph.
Mixing Height.......500 ft AGL until 0800. 12500 ft AGL after 1000.
Transport Winds.....Southwest 5 mph until 1200, then west 10 to 15
mph.
Smoke dispersal.....Poor until 0900. Very good after 1200.
.FORECAST FOR DAY 3 THROUGH 7...
.SATURDAY...Clear. Lows 47-57. Highs 83-93. Winds less than
15 mph.
.SUNDAY...Clear. Lows 50-60. Highs 85-95. Winds less than 15 mph.
.MONDAY...Mostly clear. Lows 51-61. Highs 84-94. Northwest winds
10 to 20 mph with gusts to 40 mph.
.TUESDAY...Mostly clear. Isolated showers and thunderstorms. Lows
52-62. Highs 84-94.
.WEDNESDAY...Partly cloudy. Isolated showers and thunderstorms.
Lows 51-61. Highs 83-93.