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Elev 5491 ft, 39.97 °N, 105.24 °W

Boulder, CO Severe Weather Alertstar_ratehome

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Personal Weather Station
Location: Boulder, CO
Elevation: 5491ft
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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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