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Hazardous Weather Outlook

Hazardous Weather Outlook
National Weather Service Denver/Boulder CO
1034 AM MDT Thu Jun 17 2021

COZ030>051-181645-
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-
1034 AM MDT Thu Jun 17 2021

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

.DAY ONE...Today and Tonight

Hot and mainly dry weather will persist again today with highs
around 100 on the plains. Isolated showers and thunderstorms are
expected to develop over the high terrain in the afternoon and
move east and southeast over the plains into the evening hours,
producing mainly gusty winds up to 45 mph.

.DAYS TWO THROUGH SEVEN...Friday through Wednesday

A cool front will bring some relief to the heat on Friday and
Saturday with temperatures dropping to around 90 on the plains. It
will only be slightly cooler in the mountains. Scattered
afternoon thunderstorms are expected in and near the mountains,
with isolated late day storms on the plains. Some of the stronger
storms may produce brief heavy rain, gusty winds, and hail. A
cold front will bring cooler temperatures and a better chance of
rain late Sunday or Monday. Then we`ll warm right back up again
with highs back into the 90s on the plains by the middle of next
week.

.SPOTTER INFORMATION STATEMENT...

Spotter activation is not anticipated today or tonight.

$$



Air Quality Alert

COC013-123-001-031-059-035-005-014-069-180600-
Boulder-Weld-Adams-Denver-Jefferson-Douglas-Arapahoe-
Broomfield-Larimer-
410 PM MDT Thu Jun 17 2021

...OZONE ACTION DAY ALERT FROM 400 PM THURSDAY UNTIL 1200 AM
FRIDAY...

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 Thursday June 17 to 1200 AM Friday June 18

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 midnight,
Thursday night, June 17, 2021.  Ozone concentrations are expected
to be in the Moderate to Unhealthy for Sensitive Groups range on
Thursday. The highest concentrations of ozone are most likely for
locations within the Denver Metro area, particularly in the
western and southwestern suburbs. Ozone is expected to be in the
Good to Moderate range on Friday.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 outdoor 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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