3 products issued by NWS for: Louviers CO
Hazardous Weather Outlook
National Weather Service Denver/Boulder CO
958 AM MDT Mon Jun 30 2025

COZ030>051-011600-
Jackson County Below 9000 Feet-
West Jackson and West Grand Counties Above 9000 Feet-
Grand and Summit Counties Below 9000 Feet-
South and East Jackson/Larimer/North and Northeast Grand/
Northwest Boulder Counties Above 9000 Feet-
South and Southeast Grand/West Central and Southwest Boulder/
Gilpin/Clear Creek/Summit/North and West Park Counties Above
9000 Feet-Larimer and Boulder Counties Between 6000 and 9000 Feet-
Jefferson and West Douglas Counties Above 6000 Feet/Gilpin/Clear
Creek/Northeast Park Counties Below 9000 Feet-
Central and Southeast Park County-
Larimer County Below 6000 Feet/Northwest Weld County-
Boulder And Jefferson Counties Below 6000 Feet/West Broomfield
County-
North Douglas County Below 6000 Feet/Denver/West Adams and
Arapahoe Counties/East Broomfield County-
Elbert/Central and East Douglas Counties Above 6000 Feet-
Northeast Weld County-Central and South Weld County-Morgan County-
Central and East Adams and Arapahoe Counties-
North and Northeast Elbert County Below 6000 Feet/North Lincoln
County-
Southeast Elbert County Below 6000 Feet/South Lincoln County-
Logan County-Washington County-Sedgwick County-Phillips County-
958 AM MDT Mon Jun 30 2025

This hazardous weather outlook is for northeast and north central
Colorado.



Scattered to numerous thunderstorms will develop over the
mountains and foothills this afternoon, with the highest coverage
south of I-70 and in South Park. Stronger storms will be capable
of producing locally heavy rain, small hail, and gusty winds.
Localized minor flooding is possible along poor drainage areas.



Scattered showers and storms will occur over the mountains again
on Tuesday afternoon, with a few of these spilling onto the
plains. An isolated stronger storm will be possible in the
northeast corner of the state late in the day. Wednesday will
likely be drier with summer-like heat.

More active weather and at least scattered thunderstorm coverage is
expected by Thursday. A couple of those storms may become severe.
The chance of thunderstorms will linger into Friday, the Fourth
of July, although the latest trends would show a decrease in storm
coverage through the Fourth of July weekend.

.SPOTTER INFORMATION STATEMENT...

Spotter activation will not be needed today or tonight. However,
any heavy rain reports from the high country would be
appreciated.

---

Severe Thunderstorm Warning
COC035-059-093-302315-
/O.NEW.KBOU.SV.W.0193.250630T2225Z-250630T2315Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Denver CO
425 PM MDT Mon Jun 30 2025

The National Weather Service in Denver has issued a

* Severe Thunderstorm Warning for...
Southwestern Jefferson County in central Colorado...
East Central Park County in central Colorado...
Southwestern Douglas County in northeastern Colorado...

* Until 515 PM MDT.

* At 425 PM MDT, a severe thunderstorm was located 5 miles southwest
of Cheesman Reservoir, or 45 miles southwest of Denver, moving
northwest at 10 mph.

HAZARD...60 mph wind gusts and quarter size hail.

SOURCE...Radar indicated.

IMPACT...Hail damage to vehicles is expected. Expect wind
damage to roofs, siding, and trees.

* Locations impacted include...
Cheesman Reservoir, Wellington Lake and Deckers.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Seek shelter inside a well-built structure and stay away from
windows. This storm is capable of producing damaging winds and large
hail.



LAT...LON 3917 10554 3934 10542 3932 10524 3923 10520
3913 10516 3913 10533 3906 10533
TIME...MOT...LOC 2225Z 150DEG 6KT 3915 10534

HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.00 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH

---

COC069-005-014-031-001-123-013-035-059-012200-
Larimer-Arapahoe-Broomfield-Denver-Adams-Weld-Boulder-
Douglas-Jefferson-
410 PM MDT Mon Jun 30 2025

...OZONE ACTION DAY ALERT FROM 400 PM MONDAY UNTIL 400 PM
TUESDAY...

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 Monday June 30 to 400 PM Tuesday July 01

IMPACTS...Ozone Action Day Alert is now in effect for the Front
Range Urban Corridor. Although ozone concentrations will remain
in the Good to Moderate range on Monday, higher ozone levels are
expected on Tuesday. Ozone concentrations could reach the
Unhealthy for Sensitive Groups category Tuesday afternoon and
evening. The highest chance for these elevated ozone levels will
be in western parts of the Denver metro area, including Golden.
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.
Tuesday, July 1, 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.