Longmont Warnings, Watches and Advisories

Do not drive vehicles through flooded areas. The water depth or fast flowing water/mud/debris from a flash flood will make road conditions unsafe. Do not rely soley on data presented here or other third-party websites - always check your official national and local weather service agency website, socials, radio and/or TV stations for making critical decisions related to weather events.

Please carefully read each posted Warning and Alert as it relates to the area(s) being affected. We may provide a wider range of issued severe weather warnings for surrounding cities and counties, so some alerts may not directly impact this location. This is done to help with preparing for severe weather that may overlap or be heading towards Longmont.

Use the Radar Maps link provided to understand the trajectory of a storm.

Flood Advisory issued July 11 at 11:51PM MDT until July 12 at 2:00AM MDT by NWS Goodland KS

* WHAT...Urban and small stream flooding caused by excessive rainfall continues. * WHERE...A portion of northeast Colorado, including the following county, Yuma. * WHEN...Until 200 AM MDT. * IMPACTS...Minor flooding in low-lying and poor drainage areas. * ADDITIONAL DETAILS... - At 1150 PM MDT, Doppler radar and automated rain gauges indicated heavy rain due to thunderstorms. This will cause urban and small stream flooding. Between 1 and 3 inches of rain have fallen. - Additional rainfall amounts up to 0.5 inches are expected over the area. This additional rain will result in minor flooding. - Some locations that will experience flooding include... Wray, Beecher Island and Vernon.

Flood Advisory issued July 11 at 11:51PM MDT until July 12 at 2:00AM MDT by NWS Goodland KS

* WHAT...Flooding caused by excessive rainfall continues. * WHERE...Portions of northeast Colorado, including the following county, Yuma and northwest Kansas, including the following county, Cheyenne. * WHEN...Until 200 AM MDT /300 AM CDT/. * IMPACTS...Minor flooding in low-lying and poor drainage areas. * ADDITIONAL DETAILS... - At 1150 PM MDT /1250 AM CDT/, Doppler radar indicated heavy rain due to thunderstorms. Minor flooding is ongoing or expected to begin shortly in the advisory area. Between 1 and 3 inches of rain have fallen. - Additional rainfall amounts up to 1 inch are expected over the area. This additional rain will result in minor flooding. - Some locations that will experience flooding include... mainly rural areas of Southeastern Yuma and Southwestern Cheyenne Counties

Flood Advisory issued July 11 at 11:51PM MDT until July 12 at 2:00AM MDT by NWS Goodland KS

* WHAT...Flooding caused by excessive rainfall continues. * WHERE...A portion of northeast Colorado, including the following county, Yuma. * WHEN...Until 200 AM MDT. * IMPACTS...Minor flooding in low-lying and poor drainage areas. * ADDITIONAL DETAILS... - At 1150 PM MDT, Doppler radar indicated heavy rain due to thunderstorms. Minor flooding is ongoing or expected to begin shortly in the advisory area. Between 1 and 3 inches of rain have fallen. - Additional rainfall amounts up to 1 inch are expected over the area. This additional rain will result in minor flooding. - Some locations that will experience flooding include... mainly rural areas of South Central Yuma County

Flood Watch issued July 11 at 5:44PM MDT until July 12 at 9:00AM MDT by NWS Goodland KS

* WHAT...A localized band of heavy rainfall with 2-4" will be possible across Yuma, Cheyenne, and Dundy counties as multiple rounds of storms move through the area overnight Friday into Saturday. * WHERE...Portions of northeast Colorado, including the following county, Yuma, northwest Kansas, including the following county, Cheyenne, and southwest Nebraska, including the following county, Dundy. * WHEN...Through Saturday morning. * IMPACTS...Excessive runoff may result in flooding of rivers, creeks, streams, and other low-lying and flood-prone locations. Extensive street flooding and flooding of creeks and rivers are possible. Overnight flooding will make it difficult to see the depth of any water.

Air Quality Alert issued July 11 at 4:10PM MDT by NWS Pueblo CO

The Colorado Department of Public Health and Environment has issued the following... WHAT...Air Quality Health Advisory for Wildfire Smoke. WHERE...Saguache, San Juan, Hinsdale, Mineral, Archuleta, Mesa, Delta, Gunnison, Montrose, Ouray, San Miguel, Dolores, Montezuma, La Plata, Rio Grande and Conejos Counties. Locations include, but are not limited to Saguache, Silverton, Lake City, Creede, Pagosa Springs, Delta, Gunnison, Montrose, Nucla, Ouray, Telluride, Dove Creek, Cortez, Durango, Hermosa, Honeyville, Rockwood, Del Norte, South Fork and Conejos. WHEN...900 AM Friday July 11 to 900 AM Saturday July 12 IMPACTS...Multiple wildfires across the region will produce moderate to heavy smoke through at least early Saturday morning. HEALTH INFORMATION...Public Health Recommendations: If smoke is thick or becomes thick in your neighborhood you may want to remain indoors. This is especially true for those with heart disease, respiratory illnesses, the very young, and older adults. Consider limiting outdoor activity when moderate to heavy smoke is present. Consider relocating temporarily if smoke is present indoors and is making you ill. If visibility is less than 5 miles in smoke in your neighborhood, smoke has reached levels that are unhealthy.

Air Quality Alert issued July 11 at 4:10PM MDT by NWS Grand Junction CO

The Colorado Department of Public Health and Environment has issued the following... WHAT...Air Quality Health Advisory for Wildfire Smoke. WHERE...Saguache, San Juan, Hinsdale, Mineral, Archuleta, Mesa, Delta, Gunnison, Montrose, Ouray, San Miguel, Dolores, Montezuma, La Plata, Rio Grande and Conejos Counties. Locations include, but are not limited to Saguache, Silverton, Lake City, Creede, Pagosa Springs, Delta, Gunnison, Montrose, Nucla, Ouray, Telluride, Dove Creek, Cortez, Durango, Hermosa, Honeyville, Rockwood, Del Norte, South Fork and Conejos. WHEN...900 AM Friday July 11 to 900 AM Saturday July 12 IMPACTS...Multiple wildfires across the region will produce moderate to heavy smoke through at least early Saturday morning. HEALTH INFORMATION...Public Health Recommendations: If smoke is thick or becomes thick in your neighborhood you may want to remain indoors. This is especially true for those with heart disease, respiratory illnesses, the very young, and older adults. Consider limiting outdoor activity when moderate to heavy smoke is present. Consider relocating temporarily if smoke is present indoors and is making you ill. If visibility is less than 5 miles in smoke in your neighborhood, smoke has reached levels that are unhealthy.

Air Quality Alert issued July 11 at 4:10PM MDT by NWS Denver CO

The Colorado Department of Public Health and Environment has issued the following... WHAT...Ozone Action Day Alert. WHERE...Douglas, Jefferson, Denver, western Arapahoe, western Adams, Broomfield, Boulder, Larimer, and Weld Counties WHEN...400 PM Friday July 11 to 400 PM Saturday July 12 IMPACTS...Ozone Action Day Alert is now in effect for the Front Range Urban Corridor. Unsettled weather will keep ozone in the Good to Moderate range on Friday. However, hot, stagnant weather on Saturday will allow ozone to reach the Unhealthy for Sensitive Groups level. For Colorado air quality conditions, forecasts, and advisories, visit: https://www.colorado.gov/airquality/colorado_summary.aspx If possible, please help us reduce ozone pollution by limiting driving gas and diesel-powered vehicles until at least 4 p.m. Saturday, July 12, 2025. Colorado is also addressing ozone pollution through state policies. For more information about health impacts and how ozone pollution forms in Colorado, visit: https://cdphe.colorado.gov/ozone- pollution-and-your-health HEALTH INFORMATION...Increasing likelihood of respiratory symptoms and breathing discomfort in active children and adults and people with lung disease, such as asthma. Active children and adults, and people with lung disease, such as asthma, should reduce prolonged or heavy outdoor exertion.

Air Quality Alert issued July 11 at 9:10AM MDT by NWS Pueblo CO

The Colorado Department of Public Health and Environment has issued the following... WHAT...Air Quality Health Advisory for Wildfire Smoke. WHERE...Saguache, San Juan, Hinsdale, Mineral, Archuleta, Mesa, Delta, Gunnison, Montrose, Ouray, San Miguel, Dolores, Montezuma, La Plata, Rio Grande and Conejos Counties. Locations include, but are not limited to Saguache, Silverton, Lake City, Creede, Pagosa Springs, Delta, Gunnison, Montrose, Nucla, Ouray, Telluride, Dove Creek, Cortez, Durango, Hermosa, Honeyville, Rockwood, Del Norte, South Fork and Conejos. WHEN...900 AM Friday July 11 to 900 AM Saturday July 12 IMPACTS...Multiple wildfires across the region will produce moderate to heavy smoke through at least early Saturday morning. HEALTH INFORMATION...Public Health Recommendations: If smoke is thick or becomes thick in your neighborhood you may want to remain indoors. This is especially true for those with heart disease, respiratory illnesses, the very young, and older adults. Consider limiting outdoor activity when moderate to heavy smoke is present. Consider relocating temporarily if smoke is present indoors and is making you ill. If visibility is less than 5 miles in smoke in your neighborhood, smoke has reached levels that are unhealthy.

Air Quality Alert issued July 11 at 9:10AM MDT by NWS Grand Junction CO

The Colorado Department of Public Health and Environment has issued the following... WHAT...Air Quality Health Advisory for Wildfire Smoke. WHERE...Saguache, San Juan, Hinsdale, Mineral, Archuleta, Mesa, Delta, Gunnison, Montrose, Ouray, San Miguel, Dolores, Montezuma, La Plata, Rio Grande and Conejos Counties. Locations include, but are not limited to Saguache, Silverton, Lake City, Creede, Pagosa Springs, Delta, Gunnison, Montrose, Nucla, Ouray, Telluride, Dove Creek, Cortez, Durango, Hermosa, Honeyville, Rockwood, Del Norte, South Fork and Conejos. WHEN...900 AM Friday July 11 to 900 AM Saturday July 12 IMPACTS...Multiple wildfires across the region will produce moderate to heavy smoke through at least early Saturday morning. HEALTH INFORMATION...Public Health Recommendations: If smoke is thick or becomes thick in your neighborhood you may want to remain indoors. This is especially true for those with heart disease, respiratory illnesses, the very young, and older adults. Consider limiting outdoor activity when moderate to heavy smoke is present. Consider relocating temporarily if smoke is present indoors and is making you ill. If visibility is less than 5 miles in smoke in your neighborhood, smoke has reached levels that are unhealthy.