Colorado

Weld County

Flood Advisory issued July 21 at 8:29PM MDT until July 21 at 10:30PM MDT by NWS Denver CO

8:29 PM — 10:30 PM

* WHAT...Flooding caused by excessive rainfall is expected. * WHERE...Northeastern Larimer County in north central Colorado... * WHEN...Until 1030 PM MDT. * IMPACTS...Minor flooding in low-lying and poor drainage areas. * ADDITIONAL DETAILS... - At 829 PM MDT, Doppler radar and automated rain gauges indicated heavy rain due to thunderstorms. Minor flooding is ongoing or expected to begin shortly in the advisory area. Between 0.5 and 1.5 inches of rain have fallen. - Some locations that will experience flooding include... Virginia Dale and Red Feather Lakes.

Flood Advisory issued July 21 at 7:24PM MDT until July 21 at 9:15PM MDT by NWS Denver CO

7:24 PM — 9:15 PM

* WHAT...Small stream flooding caused by excessive rainfall continues. * WHERE...West Central Larimer County in north central Colorado... * WHEN...Until 915 PM MDT. * IMPACTS...Minor flooding in low-lying and poor drainage areas. * ADDITIONAL DETAILS... - At 724 PM MDT, Doppler radar and automated rain gauges indicated heavy rain due to thunderstorms. This may cause small stream flooding. Between 0.5 and 1.5 inches of rain have fallen. - This includes the following streams and drainages... Rawah Creek, Sheep Creek, North Fork Rawah Creek, Camp Creek, Nunn Creek, Laramie River, Joe Wright Creek, Deadman Creek, Two and One Half Creek, Brinker Creek and North Fork West Branch Laramie River. - Some locations that will experience flooding include... Mainly rural areas of West Central Larimer County.

Flood Advisory issued July 21 at 7:21PM MDT until July 21 at 9:15PM MDT by NWS Denver CO

7:21 PM — 9:15 PM

* WHAT...Flooding caused by excessive rainfall is expected. * WHERE...Central Larimer County in north central Colorado... * WHEN...Until 915 PM MDT. * IMPACTS...Minor flooding in low-lying and poor drainage areas. * ADDITIONAL DETAILS... - At 721 PM MDT, Doppler radar and automated rain gauges indicated heavy rain due to thunderstorms. Minor flooding is ongoing or expected to begin shortly in the advisory area. Up to 1 inch of rain has fallen. - Some locations that will experience flooding include... Kinikinik.

Air Quality Alert issued July 21 at 4:10PM MDT by NWS Denver CO

4:10 PM — July 22nd, 4:00 PM

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 Tuesday July 21 to 400 PM Wednesday July 22 IMPACTS...Ozone Action Day Alert is now in effect for the Front Range Urban Corridor. Hot and sunny weather with limited chances for afternoon storms will allow ozone concentrations to reach the Unhealthy for Sensitive Groups category on Tuesday and Wednesday. On Tuesday elevated ozone is possible in the Denver Metro area, Fort Collins, Greeley, and surrounding areas. On Wednesday the highest ozone is expected to be confined to locations within the Denver Metro area. 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. Wednesday, July 22, 2026. 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.

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