Air Quality Alert
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.
$$
Hazardous Weather Outlook
Hazardous Weather Outlook
National Weather Service Pueblo CO
726 PM MDT Mon Jun 30 2025
COZ058>089-093>099-020130-
Western Mosquito Range/East Lake County Above 11000 Feet-
Leadville Vicinity/Lake County Below 11000 Feet-
Eastern Sawatch Mountains Above 11000 Feet-
Western Chaffee County Between 9000 and 11000 Feet-
Central Chaffee County Below 9000 Feet-
Western Mosquito Range/East Chaffee County Above 9000 Feet-
Saguache County West of Continental Divide Below 10000 Feet-
Saguache County East of Continental Divide Below 10000 Feet-
La Garita Mountains Above 10000 Feet-
Upper Rio Grande Valley/Eastern San Juan Mountains Below
10000 Feet-Eastern San Juan Mountains Above 10000 Feet-
Del Norte Vicinity/Northern San Luis Valley Below 8500 Feet-
Alamosa Vicinity/Central San Luis Valley Below 8500 Feet-
Southern San Luis Valley-
Northern Sangre de Cristo Mountains Between 8500 And 11000 Feet-
Northern Sangre de Cristo Mountains Above 11000 Feet-
Southern Sangre de Cristo Mountains Between 7500 and 11000 Feet-
Southern Sangre de Cristo Mountains Above 11000 Feet-
Northwestern Fremont County Above 8500 Feet-
Western/Central Fremont County Below 8500 Feet-
Wet Mountain Valley Below 8500 Feet-
Wet Mountains between 6300 and 10000 Feet-
Wet Mountains Above 10000 Feet-
Teller County/Rampart Range Above 7500 Feet/Pikes Peak Between
7500 And 11000 Feet-Pikes Peak Above 11000 Feet-
Canon City Vicinity/Eastern Fremont County-
Northern El Paso County/Monument Ridge/Rampart Range Below
7500 Feet-
Colorado Springs Vicinity/Southern El Paso County/Rampart Range
Below 7400 Feet-Pueblo Vicinity/Pueblo County Below 6300 Feet-
Walsenburg Vicinity/Upper Huerfano River Basin Below 7500 Feet-
Trinidad Vicinity/Western Las Animas County Below 7500 Feet-
Crowley County-La Junta Vicinity/Otero County-
Eastern Las Animas County-Western Kiowa County-
Eastern Kiowa County-Las Animas Vicinity/Bent County-
Lamar Vicinity/Prowers County-Springfield Vicinity/Baca County-
726 PM MDT Mon Jun 30 2025
This hazardous weather outlook is for portions of central...east
central...south central and southeast Colorado.
.DAY ONE...Tonight
Scattered showers and thunderstorms over the higher terrain this
evening will dissipate by late evening. The main threats with any
stronger storms will be be periods of heavy rain, frequent
lightning, and wind gusts to around 45 mph. Burn scars and other
vulnerable areas will be a concern for flash flooding.
.DAYS TWO THROUGH SEVEN...Tuesday through Sunday
Scattered afternoon and evening showers and thunderstorms are
expected ever day over the mountains with more isolated activity
over the plains. The primary concerns will be wind gusts to 40 to
50 mph, locally heavy rainfall and cloud to ground lightning. The
overall best chance for some more organized heavy rain over the
mountains will occur on Thursday.
.SPOTTER INFORMATION STATEMENT...
Weather conditions that meet reporting criteria for spotters will
be possible over portions of the region.
$$
SIMCOE/34
Hazardous Weather Outlook
National Weather Service Cheyenne WY
235 PM MDT Mon Jun 30 2025
NEZ002-003-019>021-054-055-095-096-WYZ101>119-012045-
Dawes County-Box Butte County-Scotts Bluff County-Banner County-
Morrill County-Kimball County-Cheyenne County-
Northern Sioux County-Southern Sioux County-
Converse County Lower Elevations-Niobrara County-
North Laramie Range-Ferris/Seminoe/Shirley Mountains-
Shirley Basin-Central Laramie Range and Southwest Platte County-
East Platte County-Goshen County-Central Carbon County-
North Snowy Range Foothills-Southwest Carbon County-
Sierra Madre Range-Upper North Platte River Basin-Snowy Range-
Laramie Valley-South Laramie Range-South Laramie Range Foothills-
Central Laramie County-East Laramie County-
235 PM MDT Mon Jun 30 2025
This hazardous weather outlook is for portions of panhandle
Nebraska...east central Wyoming...south central Wyoming and
southeast Wyoming.
.DAY ONE...THIS AFTERNOON AND TONIGHT
Isolated showers and storms are possible across southeast Wyoming
this evening, but chances are low, around 15 to 20%.
.DAYS TWO THROUGH SEVEN...TUESDAY THROUGH SUNDAY
There is a Marginal Risk (Level 1 of 5) of severe weather Tuesday
afternoon for portions of western Nebraska. Warm temperatures and
daily chances for PM showers and thunderstorms will return for
Tuesday onwards.
.Spotter information statement...
Spotter activation will not be needed.
$$
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.
.DAY ONE...Today and Tonight
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.
.DAYS TWO THROUGH SEVEN...Tuesday through Sunday
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.
$$
Hazardous Weather Outlook
National Weather Service Grand Junction CO
303 AM MDT Mon Jun 30 2025
COZ001>014-017>023-UTZ022>025-027>029-011200-
Lower Yampa River Basin-Central Yampa River Basin-
Roan and Tavaputs Plateaus-Elkhead and Park Mountains-
Upper Yampa River Basin-Grand Valley-Debeque to Silt Corridor-
Central Colorado River Basin-Grand and Battlement Mesas-
Gore and Elk Mountains/Central Mountain Valleys-
Central Gunnison and Uncompahgre River Basin-
West Elk and Sawatch Mountains-Flat Tops-Upper Gunnison River Valley-
Uncompahgre Plateau and Dallas Divide-Northwest San Juan Mountains-
Southwest San Juan Mountains-Paradox Valley/Lower Dolores River-
Four Corners/Upper Dolores River-Animas River Basin-
San Juan River Basin-Southeast Utah-Eastern Uinta Mountains-
Eastern Uinta Basin-Tavaputs Plateau-Arches/Grand Flat-
La Sal and Abajo Mountains-Canyonlands/Natural Bridges-
303 AM MDT Mon Jun 30 2025
This Hazardous Weather Outlook is for northwest Colorado, southwest
Colorado, west central Colorado, east central Utah, northeast Utah
and southeast Utah.
.DAY ONE...Today and tonight.
Scattered thunderstorms are likely over the high terrain this
afternoon. Storms may produce gusty outflow winds up to 50 mph and
small hail.
.DAYS TWO THROUGH SEVEN...Tuesday through Sunday.
Thunderstorms are likely each afternoon through the seven-day
forecast, especially over the high terrain.
.SPOTTER INFORMATION STATEMENT...
Spotter activation is not expected at this time.
$$
