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Hazardous Weather Outlook

Hazardous Weather Outlook
National Weather Service Denver/Boulder CO
1038 AM MDT Fri Sep 25 2020

COZ030>051-261645-
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-
1038 AM MDT Fri Sep 25 2020

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

.DAY ONE...Today and Tonight

Very warm and dry conditions, combined with gusty west winds,
will lead to critical fire danger across the mountains, high
mountain valleys and foothills this afternoon. Winds could gust
to 40 mph, and RH should drop below 15 percent. Conditions are
favorable for rapid fire growth this afternoon across north
central Colorado.

.DAYS TWO THROUGH SEVEN...Saturday through Thursday

Warm and dry conditions are expected to continue Saturday,
leading to areas of critical fire danger. The greatest threat
will be across the northern plains where wind gusts may reach up
to 35 mph. Another area of concern will the South Park and the
southern foothills where gusts will be between 25 and 30 mph.

Cooling temperatures are expected Sunday as a strong cold front
pushes south across the area, which will help ease fire danger
levels. Light rain is expected across much of the area Sunday
afternoon and evening with light snow possible in the mountains.
Snow levels will be lowering to near 8000 ft by late afternoon north
of I70, continuing south through the evening over areas south of
I70. Snowfall accumulations will be less than one inch and travel
impacts should be very minimal. No hazardous weather is expected
Monday through Thursday.


.SPOTTER INFORMATION STATEMENT...

Spotter activation will not be needed today and tonight.

$$



Air Quality Alert

COC013-123-001-031-059-035-005-014-069-262200-
Boulder-Weld-Adams-Denver-Jefferson-Douglas-Arapahoe-
Broomfield-Larimer-
610 PM MDT Fri Sep 25 2020

...ACTION DAY FOR PARTICULATES FROM 400 PM FRIDAY UNTIL 400 PM
SATURDAY...

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

WHAT...Action Day for Particulates.

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

WHEN...400 PM Friday September 25 to 400 PM Saturday September 26

IMPACTS...Action Day for Particulates is now in effect for the
seven-county Denver-Boulder metropolitan area. Requests to limit
driving of non- ZEV vehicles (i.e., gas or diesel) are now in
effect until at least 4 PM Saturday, September 26, 2020.  Wildfire
smoke from several fires in northern and central Colorado has
increased fine particulate concentrations in the northern Colorado
Front Range region, including the Denver Metro area, Longmont, Ft.
Collins, and Greeley. Concentrations of fine particulates in these
areas may reach the Unhealthy for Sensitive Groups category at
times on Friday and Saturday.For areas included in this advisory
that are not expected to exceed 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
in sensitive individuals, aggravation of heart or lung disease and
premature mortality in people with cardiopulmonary disease and
older adults. People with heart or lung disease, older adults, and
children should reduce prolonged or heavy exertion.

$$



Red Flag Warning

URGENT - FIRE WEATHER MESSAGE
National Weather Service Denver/Boulder CO
759 PM MDT Fri Sep 25 2020

Very warm and dry conditions are expected today and Saturday. Red
flag conditions are expected this afternoon for strong winds and
low relative humidity. The strongest winds and driest conditions
are expected east of the Divide across Larimer County, though
favorable conditions for rapid fire growth are possible across
all of the warned area.

Strong winds will again occur on Saturday as well. Gusty winds
will develop in the foothills and South Park early Saturday
morning, then spread across the plains along the Wyoming border
and southward in the afternoon. Relative humidities will remain
fairly low with minimal recovery in the foothills overnight.
Consequently, a Red Flag Warning has been issued for these areas.

COZ238-239-242>244-248-250-251-261000-
/O.CON.KBOU.FW.W.0026.200926T1800Z-200927T0100Z/
Larimer County Below 6000 Feet/Northwest Weld County-
Boulder And Jefferson Counties Below 6000 Feet/West Broomfield
County-Northeast Weld County-Central and South Weld County-
Morgan County-Logan County-Sedgwick County-Phillips County-
759 PM MDT Fri Sep 25 2020

...RED FLAG WARNING REMAINS IN EFFECT FROM NOON TO 7 PM MDT
SATURDAY FOR WIND AND LOW RELATIVE HUMIDITY FOR THE LOWER
ELEVATIONS OF LARIMER COUNTY AS WELL AS NORTHERN WELD, LOGAN,
SEDGWICK AND PHILLIPS COUNTIES...

* Affected Area...Fire Weather Zones 238, 239, 242, 243, 244,
  248, 250 and 251.

* Timing...Saturday from Noon to 7 PM.

* Winds...Northwest 15 to 25 mph with gusts up to 40 mph.

* Relative Humidity...As low as 11 percent.

* Impacts...New fire starts will be possible due to the gusty
  winds and very low humidity.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Red Flag Warning means that critical fire weather conditions
are either occurring now....or will shortly. A combination of
strong winds...low relative humidity...and warm temperatures can
contribute to extreme fire behavior.

&&

$$




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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