Severe thunderstorms are likely today across the northern Plains and into the upper Mississippi Valley. Gusty winds and dry conditions will result in widespread critical fire weather through Saturday across parts of the Four Corners region and the Great Basin. A significant and dangerous heat wave will expand from the Central U.S. into the Eastern U.S this weekend through much of next week. Read More >
COZ291-211230- COZ291-211230- Northern San Juan Forecast Area- 221 PM MDT Fri Jun 20 2025 Fire Weather Planning Forecast for Wrn Colorado and Ern Utah National Weather Service Grand Junction CO 221 PM MDT Fri Jun 20 2025 ...RED FLAG WARNING REMAINS IN EFFECT THROUGH 0 AM SATURDAY OVERNIGHT FOR GUSTY WINDS, LOW HUMIDITY AND DRY FUELS FOR COLORADO FIRE WEATHER ZONES 200, 202, 203 BELOW 8000 FEET, 205 BELOW 8000 FEET, 207, 290, 291, 292, 293, 294 AND 295 BELOW 8500 FEET, AS WELL AS UTAH FIRE WEATHER ZONES 485, 486, 487, 490 AND 491... ...RED FLAG WARNING IN EFFECT FROM 9 AM UNTIL 0 AM MDT SATURDAY FOR GUSTY WINDS, LOW HUMIDITY AND DRY FUELS FOR COLORADO FIRE WEATHER ZONES 200, 202, 203 BELOW 8000 FEET, 205 BELOW 8000 FEET, 207, 290, 291, 292, 293, 294 AND 295 BELOW 8500 FEET, AS WELL AS UTAH FIRE WEATHER ZONES 485, 486, 487, 490 AND 491... ...FIRE WEATHER WATCH IN EFFECT SUNDAY AFTERNOON THROUGH SUNDAY EVENING FOR GUSTY WINDS, LOW HUMIDITY AND DRY FUELS FOR COLORADO FIRE WEATHER ZONES 200, 202, 203 BELOW 8000 FEET, 205 BELOW 8000 FEET, 207, 290, 291, 292, 293, 294 AND 295 BELOW 8500 FEET, AS WELL AS UTAH FIRE WEATHER ZONES 486, 487, 490 AND 491... .DISCUSSION...Several more days of dry and windy conditions are expected to bring widespread critical fire weather to much of eastern Utah and western Colorado where fuels are dry. Widespread gusts of 40 to 50 mph can be expected today and tomorrow afternoon. Though temperatures will slowly fall the next few days...low humidity and gusty winds remain in place. Wetting rainfall is unlikely in most areas over the next 7 days. ...GUSTY ERRATIC WINDS CAN BE EXPECTED NEAR ANY SHOWERS OR THUNDERSTORMS... ...THE SMOKE DATA IS CALCULATED FROM AN AVERAGE AT 6000 FEET MSL... ...RED FLAG WARNING IN EFFECT UNTIL MIDNIGHT MDT TONIGHT... ...RED FLAG WARNING IN EFFECT FROM 9 AM SATURDAY TO MIDNIGHT MDT SATURDAY NIGHT... ...FIRE WEATHER WATCH IN EFFECT FROM SUNDAY AFTERNOON THROUGH SUNDAY EVENING... .TONIGHT... Sky/weather.........Clear (0-10%). Chc of lightning....0 percent. Min temperature.....48-58 F. Max humidity........22-32%. 20-foot winds.......South winds 15 to 20 mph with gusts to 45 mph. CWR.................0 percent. 15K Ft MSL Winds....Southwest 35 to 45 mph increasing to 45 to 55 mph after midnight. Mixing Height.......11000 ft AGL until 2000, then 2000 ft AGL. Transport Winds.....Southwest 15 to 20 mph. Smoke dispersal.....Excellent until 2100, then poor. .SATURDAY... Sky/weather.........Sunny (0-10%). Chc of lightning....0 percent. Max temperature.....69-79 F. Min humidity........7-12%. 20-foot winds.......Southwest winds 15 to 20 mph with gusts to 40 mph. CWR.................0 percent. 15K Ft MSL Winds....Southwest 35 to 45 mph decreasing to 30 to 40 mph in the afternoon. Mixing Height.......2000 ft AGL until 0800, then 9500 ft AGL. Transport Winds.....Southwest 20 to 25 mph until 1200, then 25 to 35 mph. Smoke dispersal.....Poor until 0900, then excellent. .SATURDAY NIGHT... Sky/weather.........Clear (0-10%). Chc of lightning....0 percent. Min temperature.....43-53 F. Max humidity........36-46%. 20-foot winds.......South winds 10 to 15 mph with gusts to 40 mph. CWR.................0 percent. 15K Ft MSL Winds....Southwest 35 to 45 mph increasing to 40 to 50 mph after midnight. Mixing Height.......9000 ft AGL until 2000, then 2000 ft AGL. Transport Winds.....Southwest 15 to 20 mph. Smoke dispersal.....Excellent until 2100, then poor. .SUNDAY... Sky/weather.........Sunny (0-10%). Chc of lightning....0 percent. Max temperature.....64-74 F. Min humidity........10-15%. 20-foot winds.......Southwest winds 15 to 20 mph with gusts to 40 mph. CWR.................0 percent. 15K Ft MSL Winds....Southwest 40 to 50 mph decreasing to 30 to 40 mph in the afternoon. Mixing Height.......3000 ft AGL until 0800, then 10500 ft AGL. Transport Winds.....Southwest 20 to 30 mph. Smoke dispersal.....Good until 0900, then excellent. .FORECAST FOR DAY 3 THROUGH 7... .MONDAY...Clear. Lows 40-50. Highs 72-82. Southwest winds 10 to 20 mph with gusts to 30 mph. .TUESDAY...Partly cloudy. Scattered showers and thunderstorms. Lows 46-56. Highs 69-79. Winds less than 15 mph. .WEDNESDAY...Partly cloudy. Scattered showers and thunderstorms. Lows 43-53. Highs 69-79. Winds less than 15 mph. .THURSDAY...Mostly clear. Isolated showers and thunderstorms. Lows 43-53. Highs 73-83. .FRIDAY...Mostly clear. Isolated showers and thunderstorms. Lows 45-55. Highs 74-84.