Helene is expected to bring life-threatening and catastrophic storm surge and damaging hurricane-force winds to Florida and inland across the Southeast. Catastrophic and life-threatening flash/urban flooding, including landslides, is expected across the southern Appalachians. Considerable to locally catastrophic flash flooding is likely for northwestern and northern Florida and the Southeast. Read More >
COZ207-271215- COZ207-271215- Southwest Colorado Lower Forecast Area- 206 PM MDT Thu Sep 26 2024 Fire Weather Planning Forecast for Wrn Colorado and Ern Utah National Weather Service Grand Junction CO 206 PM MDT Thu Sep 26 2024 .DISCUSSION...Above normal temperatures and dry conditions will continue to dominate the forecast over the next week. There is just a bit of moisture being forced over the Continental Divide tomorrow to bring isolated to widely scattered storms to the San Juans up toward Vail Pass...but the chance of wetting precipitation is very remote. In this hot and dry pattern localized areas of critical fire weather could creep up in the peak heating hours as a few wind gusts make it to the ground. ...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.........Clear (0-10%). Min temperature.....46-56 F. Max humidity........46-56%. 20-foot winds.......Upslope/upvalley 4 to 8 mph becoming downslope/downvalley 3 to 6 mph by sunset. CWR.................0 percent. LAL.................1. Haines Index........5 or moderate. 15K Ft MSL Winds....Northeast 5 to 10 mph. Mixing Height.......8000 ft AGL until 1900, then 2000 ft AGL. Transport Winds.....Northwest 5 to 10 mph until 2400, then northeast. Smoke dispersal.....Poor. .FRIDAY... Sky/weather.........Mostly sunny (10-20%). Max temperature.....77-87 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. LAL.................1. Haines Index........5 or moderate. 15K Ft MSL Winds....Southeast 5 to 10 mph. Mixing Height.......2000 ft AGL until 1100. 11500 ft AGL after 1200. Transport Winds.....Northeast 5 mph until 1200, then south. Smoke dispersal.....Poor until 1200. Good after 1500. .FRIDAY NIGHT... Sky/weather.........Mostly clear (10-20%). Min temperature.....48-58 F. Max humidity........51-61%. 20-foot winds.......Upslope/upvalley 4 to 8 mph becoming downslope/downvalley 3 to 6 mph by sunset. CWR.................0 percent. LAL.................1. Haines Index........5 or moderate. 15K Ft MSL Winds....Southeast 10 to 15 mph. Mixing Height.......7500 ft AGL until 1900, then 2000 ft AGL. Transport Winds.....Southeast 5 to 10 mph. Smoke dispersal.....Poor. .SATURDAY... Sky/weather.........Mostly sunny (10-20%). Max temperature.....78-88 F. Min humidity........12-17%. 20-foot winds.......Upslope/upvalley winds 4 to 8 mph. Localized gusts up to 25 mph. CWR.................0 percent. LAL.................1. Haines Index........4 or low. 15K Ft MSL Winds....South 10 to 15 mph. Mixing Height.......2000 ft AGL until 1000. 11500 ft AGL after 1100. Transport Winds.....South 5 to 10 mph. Smoke dispersal.....Poor until 0900. Good after 1200. .FORECAST FOR DAY 3 THROUGH 7... .SUNDAY...Mostly clear. Lows 50-60. Highs 82-92. Winds less than 15 mph. .MONDAY...Clear. Lows 49-59. Highs 82-92. Winds less than 15 mph. .TUESDAY...Clear. Lows 47-57. Highs 80-90. Winds less than 15 mph. .WEDNESDAY...Mostly clear. Lows 46-56. Highs 79-89. .THURSDAY...Mostly clear. Lows 46-56. Highs 78-88.