Weather Alerts for Colorado:Larimer 6000+

Issued by the National Weather Service

Complete Map Details displayed if included in issuing NWSFO statement content

Red Flag Warning  RED FLAG WARNING   Red Flag Warning
COLORADO:LARIMER 6000+

Areas Affected:
Larimer and Boulder Counties Between 6000 and 9000 Feet
Effective: Wed, 10/21 2:00pm Updated: Wed, 10/21 1:00am Urgency: Expected
Expires: Thu, 10/22 10:00am Severity:  Severe  Certainty: Likely

 
Details:
...Red Flag Warning for Middle Park, South Park and the northern
foothills due to low relative humidity and strong gusts...
.Low relative humidity and strong wind gusts will lead to
critical fire weather conditions in Middle Park, South Park and
the northern foothills, beginning Wednesday at noon. Strong wind
gusts up to 40 mph will be coincident with minimum humidities as
low as 12 percent. The warning will expire for Middle Park and
South Park at 7 PM MDT Wednesday due to a break in the wind gusts
from the airmass decoupling, but will remain in effect in the
northern foothills until 8AM Thursday due to poor humidity
recovery overnight and a mountain wave set up to increase winds
overnight in this area, as well as ongoing fire activity.
Overnight maximum humidity in much of the zone will likely in the
20 to 30 percent range while winds increase with gusts 30 mph to
as much as 50 mph. Highest wind gusts found mainly above 9000
feet.
...RED FLAG WARNING IN EFFECT FROM NOON WEDNESDAY TO 8 AM MDT
THURSDAY FOR WIND AND LOW RELATIVE HUMIDITY FOR THE NORTHERN
FOOTHILLS...
The National Weather Service in Denver has issued a Red Flag
Warning for wind and low relative humidity, which is in effect
from noon Wednesday to 8 AM MDT Thursday.
* Affected Area...Fire Weather Zone 215.
* Timing...From noon Wednesday to 8 AM MDT Thursday.
* Winds...West 10 to 20 mph with gusts up to 40 mph.
* Relative Humidity...As low as 16 percent.
* Impacts...Critical fire weather conditions.

Information:
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.

Air Quality Alert  AIR QUALITY ALERT   Air Quality Alert
COLORADO:LARIMER 6000+

Areas Affected:
Adams - Arapahoe - Boulder - Broomfield - Denver - Douglas - Jefferson - Larimer - Weld
Effective: Tue, 10/20 6:10pm Updated: Wed, 10/21 1:00am Urgency: Unknown
Expires: Wed, 10/21 6:00pm Severity: Unknown Certainty: Unknown

 
Details:
...ACTION DAY FOR PARTICULATES FROM 400 PM TUESDAY UNTIL 400 PM
WEDNESDAY...
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 Tuesday October 20 to 400 PM Wednesday October 21
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 Wednesday, October 21, 2020.  Moderate
to heavy smoke can be expected Tuesday afternoon and evening for
locations in Larimer and Boulder counties near the Cameron Peak,
Calwood, and Lefthand Canyon wildfires, along with locations below
the fires in the Front Range Urban Corridor from Ft. Collins
southward to Longmont, Boulder, and Denver. Smoke levels will
likely fluctuate for these areas Tuesday night through Wednesday
afternoon, but the threat for periods of heavy smoke is expected
to continue. CDPHE requests 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...If smoke is thick or becomes thick in your
neighborhood you may want to remain indoors. This is especially
true for those with heart disease, respiratory illnesses, the very
young, and the elderly. Consider limiting outdoor activity when
moderate to heavy smoke is present. Consider relocating
temporarily if smoke is present indoors and is making you ill. If
visibility is less than 5 miles in smoke in your neighborhood,
smoke has reached levels that are unhealthy.