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Hazardous Weather Outlook

Hazardous Weather Outlook
National Weather Service Denver/Boulder CO
1049 AM MDT Sun Aug 1 2021

COZ030>051-021700-
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-
1049 AM MDT Sun Aug 1 2021

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

.DAY ONE...Today and Tonight

It will be drier today, with only isolated to scattered
thunderstorms expected across the mountains. There will be a
limited flash flood threat across the burn areas west of the
Continental Divide. Areas of smoke will lead to another day of
poor air quality.

.DAYS TWO THROUGH SEVEN...Monday through Saturday

Moisture is expected to increase Monday and Tuesday, with heavy
rainfall possible across the Foothills and Mountains both days. A
warming and drying trend is expected starting mid-week.
Temperatures will warm back into the 90s for the urban corridor
by Friday. This trend will also result in decreased chances of
precipitation, with chance for afternoon showers and storms
remaining over the higher terrain Wednesday through the end of
the week.

.SPOTTER INFORMATION STATEMENT...

Spotter activation will not be needed today or tonight.

$$



Air Quality Alert

COC013-123-001-031-059-035-005-014-069-012200-
Boulder-Weld-Adams-Denver-Jefferson-Douglas-Arapahoe-
Broomfield-Larimer-
910 AM MDT Sun Aug 1 2021

...ACTION DAY FOR MULTIPLE POLLUTANTS FROM 400 PM SATURDAY UNTIL
400 PM SUNDAY...

The Colorado Department of Public Health and Environment has
issued the following...

WHAT...Action Day for Multiple Pollutants.

WHERE...Douglas, Jefferson, Denver, western Arapahoe, western
Adams, Broomfield, Boulder, Larimer, and Weld Counties

WHEN...400 PM Saturday July 31 to 400 PM Sunday August 01

IMPACTS...Action Day for Multiple Pollutants is now in effect for
the Front Range Urban Corridor. Requests to limit driving of non-
ZEV vehicles (i.e., gas or diesel) are now in effect until at
least 4 p.m. Sunday, August 1, 2021.  Concentrations of both ozone
and fine particulates are expected to reach the Unhealthy for
Sensitive Groups category on Sunday. Elevated concentrations of
these pollutants are possible throughout the Colorado Front Range
region from Fort Collins and Greeley to Colorado Springs.  For
areas included in this advisory that are not expected to reach the
Unhealthy for Sensitive Groups (USG) air quality designation, we
request that activities, such as driving non-ZEV vehicles (i.e.,
gas or diesel), be reduced to lessen the impacts on neighboring
air quality. Additional air pollution in this region may directly
worsen air quality or contribute to precursors which may also
adversely affect air quality.  For Colorado air quality
conditions, forecasts and advisories, visit:
https://www.colorado.gov/airquality/colorado_summary.aspx

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 exertion.

$$



U.S. Dept. of Commerce
NOAA National Weather Service
1325 East West Highway
Silver Spring, MD 20910
E-mail: w-nws.webmaster@noaa.gov
Page last modified: May 16, 2007
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