Red Flag Warning 22, NWS Denver/Boulder, CO

728 
WWUS85 KBOU 060156
RFWBOU

URGENT - FIRE WEATHER MESSAGE
National Weather Service Denver/Boulder CO
756 PM MDT Tue Aug 5 2025

...PROLONGED PERIOD OF CRITICAL FIRE WEATHER CONDITIONS THROUGH
FRIDAY...

.A hot and dry airmass will hold across the area through Friday.
It will be breezy at times, especially during the afternoon and
early evening hours, leading to potential for rapid wildfire
spread. While Red Flag Warnings are in effect through Wednesday,
critical fire weather conditions will likely exist Thursday and
again on Friday. Slight relief should come through the weekend
with a gradual cooling trend and winds diminishing by Sunday.

COZ211-213-217-218-061200-
/O.EXP.KBOU.FW.W.0021.000000T0000Z-250806T0200Z/
/O.CON.KBOU.FW.W.0022.250806T1800Z-250807T0200Z/
Jackson County Below 9000 Feet-
Grand and Summit Counties Below 9000 Feet-
West Jackson and West Grand Counties Above 9000 Feet-
South and East Jackson/Larimer/North and Northeast Grand/
Northwest Boulder Counties Above 9000 Feet-
756 PM MDT Tue Aug 5 2025

...RED FLAG WARNING REMAINS IN EFFECT FROM NOON TO 8 PM MDT
WEDNESDAY FOR WIND AND LOW RELATIVE HUMIDITY FOR THE NORTHERN
MOUNTAINS AND HIGH VALLEYS...FIRE WEATHER ZONES 211, 213,217, AND
218...

* AFFECTED AREA...Fire Weather Zones 211, 213, 217 and 218.

* TIMING...From noon to 8 PM MDT Wednesday.

* WINDS...Southwest 10 to 20 mph with gusts up to 30 mph.

* RELATIVE HUMIDITY...As low as 7 percent.

* IMPACTS...Conditions will be favorable for rapid fire spread. 
  Avoid outdoor burning and any activity that may produce a 
  spark and start a wildfire.

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.

&&

$$

COZ212-214-060300-
/O.EXP.KBOU.FW.W.0021.000000T0000Z-250806T0200Z/
South and Southeast Grand/West Central and Southwest Boulder/
Gilpin/Clear Creek/Summit/North and West Park Counties Above
9000 Feet-Central and Southeast Park County-
756 PM MDT Tue Aug 5 2025

...RED FLAG WARNING WILL EXPIRE AT 8 PM MDT THIS EVENING FOR WIND
AND LOW RELATIVE HUMIDITY FOR THE MOUNTAINS AROUND SUMMIT AND PARK
COUNTIES AND SOUTH PARK...

Humidities will be a little higher and winds a little lighter on
Wednesday. It will still be very warm and dry with near critical
conditions.

$$

Gimmestad

593 
WWUS85 KBOU 060915
RFWBOU

URGENT - FIRE WEATHER MESSAGE
National Weather Service Denver/Boulder CO
315 AM MDT Wed Aug 6 2025

...PROLONGED PERIOD OF CRITICAL FIRE WEATHER CONDITIONS THROUGH
FRIDAY...

.A hot and dry airmass will hold across the area through Friday.
It will be breezy at times, especially during the afternoon and
early evening hours, leading to potential for rapid wildfire
spread. While Red Flag Warnings are in effect through Wednesday,
critical fire weather conditions will likely exist Thursday and
again on Friday. Slight relief should come through the weekend
with a gradual cooling trend and winds diminishing by Sunday.

COZ211-213-217-218-062115-
/O.CON.KBOU.FW.W.0022.250806T1800Z-250807T0200Z/
Jackson County Below 9000 Feet-
Grand and Summit Counties Below 9000 Feet-
West Jackson and West Grand Counties Above 9000 Feet-
South and East Jackson/Larimer/North and Northeast Grand/
Northwest Boulder Counties Above 9000 Feet-
315 AM MDT Wed Aug 6 2025

...RED FLAG WARNING REMAINS IN EFFECT FROM NOON TODAY TO 8 PM MDT
THIS EVENING FOR WIND AND LOW RELATIVE HUMIDITY FOR THE NORTHERN
MOUNTAINS AND HIGH VALLEYS...FIRE WEATHER ZONES 211, 213,217, AND
218...

* AFFECTED AREA...Fire Weather Zones 211, 213, 217 and 218.

* TIMING...From noon today to 8 PM MDT this evening.

* WINDS...West 10 to 15 mph with gusts up to 30 mph.

* RELATIVE HUMIDITY...As low as 11 percent.

* IMPACTS...Conditions will be favorable for rapid fire spread. 
  Avoid outdoor burning and any activity that may produce a 
  spark and start a wildfire.

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.

&&

$$

824 
WWUS85 KBOU 062047
RFWBOU

URGENT - FIRE WEATHER MESSAGE
National Weather Service Denver/Boulder CO
247 PM MDT Wed Aug 6 2025

...PROLONGED PERIOD OF CRITICAL FIRE WEATHER CONDITIONS THROUGH
FRIDAY...

.A hot and dry airmass will hold across the area through Friday.
It will be breezy at times, especially during the afternoon and
early evening hours, leading to potential for rapid wildfire
spread. Red Flag Warnings are now in effect for Thursday
afternoon, with a Fire Weather Watch in effect for Friday. Slight
relief should come through the weekend with a gradual cooling 
trend and winds diminishing by Sunday.

COZ211-213-217-070500-
/O.NEW.KBOU.FW.W.0023.250807T1800Z-250808T0200Z/
/O.NEW.KBOU.FW.A.0012.250808T1800Z-250809T0200Z/
/O.CON.KBOU.FW.W.0022.000000T0000Z-250807T0200Z/
Jackson County Below 9000 Feet-
Grand and Summit Counties Below 9000 Feet-
West Jackson and West Grand Counties Above 9000 Feet-
247 PM MDT Wed Aug 6 2025

...RED FLAG WARNING REMAINS IN EFFECT UNTIL 8 PM MDT THIS EVENING
FOR WIND AND LOW RELATIVE HUMIDITY FOR THE PARK RANGE, MIDDLE 
PARK, AND NORTH PARK...FIRE WEATHER ZONES 211, 213, AND 217... 
...RED FLAG WARNING IN EFFECT FROM NOON TO 8 PM MDT THURSDAY FOR 
WIND AND LOW RELATIVE HUMIDITY... 
...FIRE WEATHER WATCH IN EFFECT FROM FRIDAY AFTERNOON THROUGH 
FRIDAY EVENING FOR WIND AND LOW RELATIVE HUMIDITY...

The National Weather Service in Denver has issued a Red Flag
Warning for wind and low relative humidity, which is in effect
from noon to 8 PM MDT Thursday. A Fire Weather Watch has also
been issued. This Fire Weather Watch for wind and low relative
humidity is in effect from Friday afternoon through Friday
evening.

* AFFECTED AREA...Fire Weather Zones 211, 213 and 217.

* TIMING...For the first Red Flag Warning, until 8 PM MDT this 
  evening. For the second Red Flag Warning, from noon to 8 PM 
  MDT Thursday. For the Fire Weather Watch, from Friday 
  afternoon through Friday evening.

* WINDS...Southwest 15 to 25 mph with gusts up to 40 mph.

* RELATIVE HUMIDITY...As low as 10 percent.

* IMPACTS...Conditions will be favorable for rapid fire spread. 
  Avoid outdoor burning and any activity that may produce a 
  spark and start a wildfire.

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.

A Fire Weather Watch means that critical fire weather conditions
are forecast to occur. Listen for later forecasts and possible
Red Flag Warnings.

&&

$$

COZ214-070500-
/O.NEW.KBOU.FW.W.0023.250807T1800Z-250808T0200Z/
/O.NEW.KBOU.FW.A.0012.250808T1800Z-250809T0200Z/
Central and Southeast Park County-
247 PM MDT Wed Aug 6 2025

...RED FLAG WARNING IN EFFECT FROM NOON TO 8 PM MDT THURSDAY FOR
WIND AND LOW RELATIVE HUMIDITY FOR SOUTH PARK... FIRE ZONE 214...
...FIRE WEATHER WATCH IN EFFECT FROM FRIDAY AFTERNOON THROUGH
FRIDAY EVENING FOR WIND AND LOW RELATIVE HUMIDITY...

The National Weather Service in Denver has issued a Red Flag
Warning for wind and low relative humidity, which is in effect
from noon to 8 PM MDT Thursday. A Fire Weather Watch has also
been issued. This Fire Weather Watch for wind and low relative
humidity is in effect from Friday afternoon through Friday
evening.

* AFFECTED AREA...Fire Weather Zone 214.

* TIMING...For the Red Flag Warning, from noon to 8 PM MDT 
  Thursday. For the Fire Weather Watch, from Friday afternoon 
  through Friday evening.

* WINDS...West 15 to 25 mph with gusts up to 35 mph.

* RELATIVE HUMIDITY...As low as 12 percent.

* IMPACTS...Conditions will be favorable for rapid fire spread. 
  Avoid outdoor burning and any activity that may produce a 
  spark and start a wildfire.

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.

A Fire Weather Watch means that critical fire weather conditions
are forecast to occur. Listen for later forecasts and possible
Red Flag Warnings.

&&

$$

COZ218-070500-
/O.NEW.KBOU.FW.A.0012.250808T1800Z-250809T0200Z/
/O.CON.KBOU.FW.W.0022.000000T0000Z-250807T0200Z/
South and East Jackson/Larimer/North and Northeast Grand/
Northwest Boulder Counties Above 9000 Feet-
247 PM MDT Wed Aug 6 2025

...RED FLAG WARNING REMAINS IN EFFECT UNTIL 8 PM MDT THIS EVENING
FOR WIND AND LOW RELATIVE HUMIDITY FOR THE NORTHERN MOUNTAINS...FIRE
WEATHER ZONE 218... 
...FIRE WEATHER WATCH IN EFFECT FROM FRIDAY AFTERNOON THROUGH 
FRIDAY EVENING FOR WIND AND LOW RELATIVE HUMIDITY...

The National Weather Service in Denver has issued a Fire Weather
Watch for wind and low relative humidity, which is in effect from
Friday afternoon through Friday evening.

* AFFECTED AREA...Fire Weather Zone 218.

* TIMING...For the Red Flag Warning, until 8 PM MDT this 
  evening. For the Fire Weather Watch, from Friday afternoon 
  through Friday evening.

* WINDS...Southwest 15 to 25 mph with gusts up to 35 mph.

* RELATIVE HUMIDITY...As low as 11 percent.

* IMPACTS...Conditions will be favorable for rapid fire spread. 
  Avoid outdoor burning and any activity that may produce a 
  spark and start a wildfire.

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.

A Fire Weather Watch means that critical fire weather conditions
are forecast to occur. Listen for later forecasts and possible
Red Flag Warnings.

&&

$$

COZ212-215-216-070500-
/O.NEW.KBOU.FW.A.0012.250808T1800Z-250809T0200Z/
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-
247 PM MDT Wed Aug 6 2025

...FIRE WEATHER WATCH IN EFFECT FROM FRIDAY AFTERNOON THROUGH
FRIDAY EVENING FOR WIND AND LOW RELATIVE HUMIDITY FOR THE CENTRAL
MOUNTAINS AND FRONT RANGE FOOTHILLS... FIRE ZONES 212, 215, AND
216...

The National Weather Service in Denver has issued a Fire Weather
Watch for wind and low relative humidity, which is in effect from
Friday afternoon through Friday evening.

* AFFECTED AREA...Fire Weather Zones 212, 215 and 216.

* TIMING...From Friday afternoon through Friday evening.

* WINDS...West 10 to 20 mph with gusts up to 35 mph.

* RELATIVE HUMIDITY...As low as 11 percent.

* IMPACTS...Conditions will be favorable for rapid fire spread. 
  Avoid outdoor burning and any activity that may produce a 
  spark and start a wildfire.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Fire Weather Watch means that critical fire weather conditions
are forecast to occur. Listen for later forecasts and possible
Red Flag Warnings.

&&

$$

952 
WWUS85 KBOU 070151
RFWBOU

URGENT - FIRE WEATHER MESSAGE
National Weather Service Denver/Boulder CO
751 PM MDT Wed Aug 6 2025

...PROLONGED PERIOD OF CRITICAL FIRE WEATHER CONDITIONS THROUGH
FRIDAY...

.A hot and dry airmass will hold across the area through Friday.
It will be breezy at times, especially during the afternoon and
early evening hours, leading to potential for rapid wildfire
spread. Red Flag Warnings are now in effect for Thursday
afternoon, with a Fire Weather Watch in effect for Friday. Slight
relief should come through the weekend with a gradual cooling
trend and winds diminishing by Sunday.

COZ211-213-217-071000-
/O.EXP.KBOU.FW.W.0022.000000T0000Z-250807T0200Z/
/O.CON.KBOU.FW.W.0023.250807T1800Z-250808T0200Z/
/O.CON.KBOU.FW.A.0012.250808T1800Z-250809T0200Z/
Jackson County Below 9000 Feet-
Grand and Summit Counties Below 9000 Feet-
West Jackson and West Grand Counties Above 9000 Feet-
751 PM MDT Wed Aug 6 2025

...RED FLAG WARNING REMAINS IN EFFECT FROM NOON TO 8 PM MDT
THURSDAY FOR WIND AND LOW RELATIVE HUMIDITY FOR THE PARK RANGE,
MIDDLE PARK, AND NORTH PARK...FIRE WEATHER ZONES 211, 213, AND
217...
...FIRE WEATHER WATCH REMAINS IN EFFECT FROM FRIDAY AFTERNOON
THROUGH FRIDAY EVENING FOR WIND AND LOW RELATIVE HUMIDITY...
...RED FLAG WARNING WILL EXPIRE AT 8 PM MDT THIS EVENING FOR WIND
AND LOW RELATIVE HUMIDITY FOR THE PARK RANGE, MIDDLE PARK, AND
NORTH PARK...FIRE WEATHER ZONES 211, 213, AND 217...

* AFFECTED AREA...Fire Weather Zones 211, 213 and 217.

* TIMING...For the Red Flag Warning, from noon to 8 PM MDT 
  Thursday. For the Fire Weather Watch, from Friday afternoon 
  through Friday evening.

* WINDS...Southwest 15 to 25 mph with gusts up to 40 mph.

* RELATIVE HUMIDITY...As low as 12 percent.

* IMPACTS...Conditions will be favorable for rapid fire spread. 
  Avoid outdoor burning and any activity that may produce a 
  spark and start a wildfire.

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.

A Fire Weather Watch means that critical fire weather conditions
are forecast to occur. Listen for later forecasts and possible
Red Flag Warnings.

&&

$$

COZ218-071000-
/O.EXP.KBOU.FW.W.0022.000000T0000Z-250807T0200Z/
/O.CON.KBOU.FW.A.0012.250808T1800Z-250809T0200Z/
South and East Jackson/Larimer/North and Northeast Grand/
Northwest Boulder Counties Above 9000 Feet-
751 PM MDT Wed Aug 6 2025

...FIRE WEATHER WATCH REMAINS IN EFFECT FROM FRIDAY AFTERNOON
THROUGH FRIDAY EVENING FOR WIND AND LOW RELATIVE HUMIDITY...
...RED FLAG WARNING WILL EXPIRE AT 8 PM MDT THIS EVENING FOR WIND
AND LOW RELATIVE HUMIDITY FOR THE NORTHERN MOUNTAINS...FIRE
WEATHER ZONE 218...

* AFFECTED AREA...Fire Weather Zone 218.

* TIMING...From Friday afternoon through Friday evening.

* WINDS...Southwest 15 to 25 mph with gusts up to 35 mph.

* RELATIVE HUMIDITY...As low as 11 percent.

* IMPACTS...Conditions will be favorable for rapid fire spread. 
  Avoid outdoor burning and any activity that may produce a 
  spark and start a wildfire.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Fire Weather Watch means that critical fire weather conditions
are forecast to occur. Listen for later forecasts and possible
Red Flag Warnings.

&&

$$

COZ214-071000-
/O.CON.KBOU.FW.W.0023.250807T1800Z-250808T0200Z/
/O.CON.KBOU.FW.A.0012.250808T1800Z-250809T0200Z/
Central and Southeast Park County-
751 PM MDT Wed Aug 6 2025

...RED FLAG WARNING REMAINS IN EFFECT FROM NOON TO 8 PM MDT
THURSDAY FOR WIND AND LOW RELATIVE HUMIDITY FOR SOUTH PARK...FIRE
ZONE 214...
...FIRE WEATHER WATCH REMAINS IN EFFECT FROM FRIDAY AFTERNOON
THROUGH FRIDAY EVENING FOR WIND AND LOW RELATIVE HUMIDITY...

* AFFECTED AREA...Fire Weather Zone 214.

* TIMING...For the Red Flag Warning, from noon to 8 PM MDT 
  Thursday. For the Fire Weather Watch, from Friday afternoon 
  through Friday evening.

* WINDS...West 15 to 25 mph with gusts up to 35 mph.

* RELATIVE HUMIDITY...As low as 12 percent.

* IMPACTS...Conditions will be favorable for rapid fire spread. 
  Avoid outdoor burning and any activity that may produce a 
  spark and start a wildfire.

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.

A Fire Weather Watch means that critical fire weather conditions
are forecast to occur. Listen for later forecasts and possible
Red Flag Warnings.

&&

$$

COZ212-215-216-071000-
/O.CON.KBOU.FW.A.0012.250808T1800Z-250809T0200Z/
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-
751 PM MDT Wed Aug 6 2025

...FIRE WEATHER WATCH REMAINS IN EFFECT FROM FRIDAY AFTERNOON
THROUGH FRIDAY EVENING FOR WIND AND LOW RELATIVE HUMIDITY FOR THE
CENTRAL MOUNTAINS AND FRONT RANGE FOOTHILLS...FIRE ZONES 212,
215, AND 216...

* AFFECTED AREA...Fire Weather Zones 212, 215 and 216.

* TIMING...From Friday afternoon through Friday evening.

* WINDS...West 10 to 20 mph with gusts up to 35 mph.

* RELATIVE HUMIDITY...As low as 12 percent.

* IMPACTS...Conditions will be favorable for rapid fire spread. 
  Avoid outdoor burning and any activity that may produce a 
  spark and start a wildfire.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Fire Weather Watch means that critical fire weather conditions
are forecast to occur. Listen for later forecasts and possible
Red Flag Warnings.

&&

$$

Area Forecast Discussion
National Weather Service Denver/Boulder CO
1156 AM MDT Tue Aug 5 2025

.KEY MESSAGES...

- Critical fire weather conditions for mountains and high valleys
  through much of the week.

- Hot and dry all areas through Friday, likely peaking Thursday
  with potential for Heat Advisory. Some relief this weekend.

&&

.UPDATE...
Issued at 338 AM MDT Tue Aug 5 2025

Minor changes to the forecast this morning. Hi-res models have
indicated a few more storms for the northeast corner before
sunrise, so have slightly increased PoPs. Otherwise, today looks
to be hot and dry. Downslope winds will aid in compressional
heating through the afternoon, which could get temperatures to the
high 90s. With models being in a general consensus of 700mb temps
between 19 and 20 C, raised high temperatures. However,
increasing smoke from wildfires could inhibit temperatures from
reaching the forecasted high.

&&

.DISCUSSION /Through Monday/...
Issued at 202 PM MDT Mon Aug 4 2025

A very dry airmass prevails over the mountains this afternoon,
while low level moisture is holding over portions of the plains,
increasing toward the eastern border. MLCAPE was holding strong
over the northeast plains into the Nebraska panhandle/far eastern
Wyoming, where values were approaching 1500-2000 J/kg. There was
still a fair amount of CIN noted (25-50 J/kg) but full sunshine
was steadily weakening that cap. Bulk shear was more than
plentiful for rotating updrafts and supercells with large hail and
damaging winds the main threat, but this is a conditional risk
upon breaking the cap. Given the diminishing CIN, we do think
that's fairly likely somewhere in the MLCAPE ridge previously
mentioned. Storms would move southeast across the plains this
evening. While there's still some uncertainty, it was also
interesting to see a couple CAMs that even had two rounds of
storms late this afternoon and evening - possibly til the midnight
hour depending on evolution.  The most likely location for the
strongest storms would be along/east of a line from Sterling to
Akron, but also a low chance back to Fort Morgan where satellite
shows cap is already eroding.

The main attention for the rest of the week then shifts to fire
weather and heat. We'll address the fire weather situation in the
Fire Weather section below. With regard to heat, the center of a
600dm 500 mb high will remain anchored over New Mexico through
Friday. This, along with passing shortwaves through the Northern
Rockies, keeps a fairly robust (for this time of year)
west/southwest flow aloft across the forecast area. That spells
strengthening downslope flow while 700 mb temperatures warm to
around 20C each afternoon. As a result, high temperatures will
soar well above normal into the upper 90s/near 100F across the
plains each day through Friday. It appears Thursday is shaping up
to be the hottest day, with record or near record temperatures
expected (e.g. Denver's record is 99F set in 1980). That also
means we'll be pushing near Heat Advisory for that day.

We'll see some relief by Saturday, as a backdoor front arrives
late Friday or Friday night. That should shave a good 10 degrees
or more off highs, and bring us closer to or below normal for the
weekend.

With regard to precipitation chances, a very dry airmass will
remain in place through most of this forecast period. However, by
Wednesday and Thursday a little moisture will start to sneak under
the ridge allowing a small chance of sprinkles/virga in/near the
mountains. Then we'll have a 20-30% chance of storms in the post
frontal airmass Saturday into Sunday.

&&

.AVIATION /18Z TAFS through 18Z Wednesday/...
Issued at 1156 AM MDT Tue Aug 5 2025

Main concern will be for reduced arrival rates due to smoke, but
some wind uncertainties as usual. With regard to smoke, we expect
slow improvement into mid afternoon as last night's area of smoke
shifts eastward. However, another plume is already originating
from increased fire activity in western Colorado, and the more
intense plumes from Rio Blanco County expected to shift eastward
across the northern Front Range late this afternoon and evening.
Given the increased fire behavior today, we expect more smoke that
last night although the initial brunt of this should impact areas
just north of KDEN and the Denver metro TAF sites. At this point,
however, it would likely be enough to start impacting visuals
toward sunset so we'll keep FU mentioned in the TAF but keep
surface visibility >6SM. That smoke will likely settle in a bit
overnight through Wednesday morning and enough to keep some FU in
the prevailing weather due to slant range visibility impacts.

With regard to wind, we're starting light and VRB. But we do expect
a gradual transition to northwest with a slight increase 20Z-22Z,
when a few gusts to ~20 kts can be expected during peak heating
and mixing. Then, look for a decrease 00Z-01Z and a gradual
return to SSW around 10 kts for 04Z-14Z. On Wednesday, a weak
front/surge approaches, which means we'll likely shift to NW-N
15Z-18Z.

&&

.FIRE WEATHER...
Issued at 202 PM MDT Mon Aug 4 2025

Concern is for an extended period of critical fire weather
conditions Tuesday through the end of the week. For Tuesday, the
flow aloft strengthens as the upper level ridge flattens in
response to a stronger shortwave moving through the Northern
Rockies. Thus, gusts around 30-35 mph can be expected in the
mountains and high valleys. In addition, an extremely dry airmass
will prevail Tuesday, with minimum humidity readings expected to
drop into the single digits in all but the higher mountains and
eastern plains. Thus, we've issued Red Flag Warnings where the
combination of gusty winds and very low RH occur, and fuels
warrant (essentially all of the mountains and high valleys of
north central Colorado). With regard to the foothills, winds will
be a little lighter but another area of concern is the foothills
of northern Larimer County which is more prone to stronger winds
in this pattern. That seems to be a smaller percentage of that zone,
and a few of the foothill locations have also seen better rains
and lower ERC percentiles so we'll monitor those locations
further.

Winds should relax slightly for Wednesday as the ridge buckles
ever so slightly. However, it will still be very warm/hot and dry
in this flow pattern, and some potential for another Red Flag.
Thursday and Friday are both shaping up to be critical fire
weather days for the mountains and high valleys as flow aloft
strengthens again. That occurs as yet another shortwave moves
across the Northern Rockies and tightens the mid level pressure
gradients. Some relief should eventually come by this weekend with
a lighter and slightly cooler WNW flow aloft. However, the chance
of any meaningful precipitation stays low.

&&

.BOU WATCHES/WARNINGS/ADVISORIES...
Red Flag Warning until 8 PM MDT this evening for COZ211>214-217-
218.

&&

UPDATE...Ideker
DISCUSSION...Barjenbruch
AVIATION...Barjenbruch
FIRE WEATHER...Barjenbruch

Hazardous Weather Outlook
National Weather Service Denver/Boulder CO
1015 AM MDT Tue Aug 5 2025

COZ030>051-061615-
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-
1015 AM MDT Tue Aug 5 2025

...RED FLAG WARNING FOR THE MOUNTAINS AND HIGH VALLEYS UNTIL 8 PM
THIS EVENING...
...HOT AND DRY THROUGH FRIDAY...

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

.DAY ONE...Today and Tonight

Critical fire weather conditions will occur through this evening
across the mountains and high valleys. Winds will gust to 25-35
mph and humidity readings will drop to 7-11 percent. That means
any new or existing wildfires will be capable of rapid spread.
Be ready to take action should a wildfire start nearby. It will be
hot in the lower elevations, with most of the plains and I-25
Corridor reaching the mid to upper 90s today.

.DAYS TWO THROUGH SEVEN...Wednesday through Monday

Critical fire weather conditions will likely remain in place through
Friday, with a continuation of hot, dry and breezy weather. High
temperatures will reach 95 to 100 degrees on the plains and I-25
Corridor each day. Those sensitive to heat should remain in air
conditioning if possible, seek shade when outdoors, and avoid
strenuous activity during the daylight hours.

Some relief of the hot, dry weather is expected by this weekend.

.SPOTTER INFORMATION STATEMENT...

Spotter activation will not be required today or tonight.