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Hazardous Weather Outlook

Hazardous Weather Outlook
National Weather Service Denver/Boulder CO
427 AM MDT Wed Jun 16 2021

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
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
Southeast Elbert County Below 6000 Feet/South Lincoln County-
Logan County-Washington County-Sedgwick County-Phillips County-
427 AM MDT Wed Jun 16 2021

This hazardous weather outlook is for northeast and north central

.DAY ONE...Today and Tonight

Hot and dry weather will persist today with highs in the upper 90s
to lower 100s on the plains and upper 80s and lower 90s in the
mountains. Isolated thunderstorms are expected to develop over the
high terrain in the afternoon and move southeast over the plains
in the evening, producing mainly gusty winds.

.DAYS TWO THROUGH SEVEN...Thursday through Tuesday

Hot conditions are expected to continue on Thursday with the
potential for record breaking heat. High temperatures on the
plains will be in the upper 90s to around 100 degrees,  while
there will be enough moisture for isolated late day showers and
thunderstorms with gusty winds the main threat.

A cool front will bring some relief to the heat on Friday with
high temperatures dropping 5 to 10 degrees. Moisture will slowly
increase through the end of the week and into the weekend, which
would bring the return of scattered showers and thunderstorms,
especially over the mountains and higher terrain.


Spotter activation is not anticipated today or tonight.


Air Quality Alert

510 PM MDT Wed Jun 16 2021


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 Wednesday June 16 to 400 PM Thursday June 17

IMPACTS...Ozone Action Day Alert 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. Thursday, June 17, 2021.  Ozone concentrations in the
Unhealthy for Sensitive Groups category will be possible both
Wednesday and Thursday. On Wednesday, the highest threat will be
for the Denver metro area, particularly the surrounding suburbs.
On Thursday, that area will expand northward to include Boulder,
Longmont, Ft. Collins, Greeley, and surrounding areas.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:

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.


U.S. Dept. of Commerce
NOAA National Weather Service
1325 East West Highway
Silver Spring, MD 20910
Page last modified: May 16, 2007
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