Weather Alerts For Longmont, CO

URGENT - FIRE WEATHER MESSAGE National Weather Service Denver/Boulder CO 357 PM MST Fri Dec 19 2025 ...THIS IS A PARTICULARLY DANGEROUS SITUATION FOR IN AND IMMEDIATELY ADJACENT TO THE FOOTHILLS, BETWEEN 5500 AND 9000 FEET, FOR BOULDER AND JEFFERSON COUNTIES ON FRIDAY... Strong west winds of 30-40 mph with gusts as high as 85 mph in the foothills of Boulder and northern Jefferson Counties will continue until early evening. Relative humidity values had dropped into the upper single digits and lower teens. Thus, the Particularly Dangerous Situation will remain in place til around 5-6 pm, with only a slow improvement thereafter as winds slowly weaken. Red Flag conditions, however, will persist through the rest of the evening as we remain in a near record warm, dry, and windy airmass along the Front Range through midnight. In fact, strong, gusty winds will persist through much of the night with only a slow improvement in humidity values. Thus, near critical Red Flag conditions will occur into early Saturday morning. While most of the Denver metro area has seen lighter winds prevail most of the day, a period of strong, gusty winds is expected to develop this evening and likely last past midnight, producing Red Flag conditions there. Boulder And Jefferson Counties Below 6000 Feet/West Broomfield County- 357 PM MST Fri Dec 19 2025 ...RED FLAG WARNING REMAINS IN EFFECT UNTIL MIDNIGHT MST TONIGHT FOR WIND AND LOW RELATIVE HUMIDITY... * THIS IS A PARTICULARLY DANGEROUS SITUATION FOR LOCATIONS ABOVE 5,500 FEET IMMEDIATELY ADJACENT TO THE BOULDER AND NORTHERN JEFFERSON COUNTY FOOTHILLS. * AFFECTED AREA...Fire Weather Zone 239. * TIMING...Until midnight MST tonight. * WINDS...West 25 to 35 mph with gusts up to 65 mph. * RELATIVE HUMIDITY...As low as 9 percent. * IMPACTS...Conditions will be favorable for rapid fire spread. Avoid outdoor burning and any activity that may produce a spark and start a fast moving wildfire. PRECAUTIONARY/PREPAREDNESS ACTIONS... This is a Particularly Dangerous Situation that poses a significant threat to life and property in the event of a wildfire start. Residents are urged to assemble an emergency supply kit and know their evacuation routes. In some cases, safe and timely evacuation may not be possible should a fire approach. Have multiple ways to receive instructions from emergency services, and evacuate if ordered to or if a fire threatens. &&