Active Weather Alerts
Severe Thunderstorm Warning
Issued: 12:09 AM Jul. 12, 2025 – National Weather Service
The National Weather Service in Denver has issued a * Severe Thunderstorm Warning for... Northeast Boulder and Southeast Boulder County in northeastern Colorado... * Until 645 PM MDT. * At 609 PM MDT, a severe thunderstorm was located near Niwot, or 28 miles northwest of Denver, moving southeast at 20 mph. HAZARD...Half dollar size hail. SOURCE...Radar indicated. IMPACT...Damage to vehicles is expected. * Locations impacted include... Northeastern Boulder, far southern Longmont, Niwot, Lafayette, and Erie. PRECAUTIONARY/PREPAREDNESS ACTIONS... Seek shelter inside a well-built structure and stay away from windows. This storm is capable of producing large hail. && PARTITION...308013 908013; HAIL THREAT...RADAR INDICATED; MAX HAIL SIZE...1.25 IN; WIND THREAT...RADAR INDICATED; MAX WIND GUST...<50 MPH
Air Quality Alert
Issued: 10:11 PM Jul. 11, 2025 – National Weather Service
...OZONE ACTION DAY ALERT FROM 400 PM FRIDAY UNTIL 400 PM SATURDAY... 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.
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