Red Flag Warning 32, NWS Denver/Boulder, CO

423 
WWUS85 KBOU 121750
RFWBOU

URGENT - FIRE WEATHER MESSAGE
National Weather Service Denver/Boulder CO
1150 AM MDT Sun Apr 12 2026

...TODAY'S RED FLAG WARNING REMAINS IN EFFECT AND UNCHANGED UNTIL
8 PM MDT THIS EVENING...

.ALL ZONES IN MONDAY'S FIRE WEATHER WATCH HAVE BEEN UPGRADED TO A
RED FLAG WARNING EXCEPT FOR WASHINGTON COUNTY WHERE WINDS WILL BE
MORE MARGINAL.

COZ249-130200-
/O.CAN.KBOU.FW.A.0025.260413T1700Z-260414T0200Z/
/O.CON.KBOU.FW.W.0032.260412T1800Z-260413T0200Z/
Washington County-
1150 AM MDT Sun Apr 12 2026

...RED FLAG WARNING REMAINS IN EFFECT UNTIL 8 PM MDT THIS EVENING
FOR WIND AND LOW RELATIVE HUMIDITY FOR WASHINGTON COUNTY...
...FIRE WEATHER WATCH IS CANCELLED FOR MONDAY FOR WIND AND LOW 
RELATIVE HUMIDITY FOR WASHINGTON COUNTY...

The National Weather Service in Denver has cancelled the Fire
Weather Watch.

* AFFECTED AREA...Fire Weather Zone 249.

* TIMING...Until 8 PM MDT this evening.

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

&&

$$

COZ214-216-238-241-246-247-131215-
/O.UPG.KBOU.FW.A.0025.260413T1700Z-260414T0200Z/
/O.NEW.KBOU.FW.W.0033.260413T1700Z-260414T0200Z/
/O.CON.KBOU.FW.W.0032.260412T1800Z-260413T0200Z/
Central and Southeast Park County-
Jefferson and West Douglas Counties Above 6000 Feet/Gilpin/Clear
Creek/Northeast Park Counties Below 9000 Feet-
Larimer County Below 6000 Feet/Northwest Weld County-
Elbert/Central and East Douglas Counties Above 6000 Feet-
North and Northeast Elbert County Below 6000 Feet/North Lincoln
County-
Southeast Elbert County Below 6000 Feet/South Lincoln County-
1150 AM MDT Sun Apr 12 2026

...RED FLAG WARNING REMAINS IN EFFECT UNTIL 8 PM MDT THIS EVENING
FOR WIND AND LOW RELATIVE HUMIDITY FOR SOUTH PARK, THE SOUTHERN
FRONT RANGE FOOTHILLS, PALMER DIVIDE INTO EAST CENTRAL COLORADO,
AND EASTERN LARIMER AND NORTHWEST WELD COUNTIES...
...RED FLAG WARNING IN EFFECT FROM 11 AM TO 8 PM MDT MONDAY FOR
WIND AND LOW RELATIVE HUMIDITY FOR SOUTH PARK, THE SOUTHERN
FRONT RANGE FOOTHILLS, PALMER DIVIDE, AND EASTERN LARIMER AND 
NORTHERN WELD COUNTIES...

The National Weather Service in Denver has issued a Red Flag
Warning for wind and low relative humidity, which is in effect
from 11 AM to 8 PM MDT Monday. The Fire Weather Watch is no
longer in effect.

* AFFECTED AREA...Fire Weather Zones 214, 216, 238, 241, 246 and 
  247.

* TIMING...For the first Red Flag Warning, until 8 PM MDT this 
  evening. For the second Red Flag Warning, from 11 AM to 8 PM 
  MDT Monday.

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

&&

$$

COZ242-131215-
/O.UPG.KBOU.FW.A.0025.260413T1700Z-260414T0200Z/
/O.NEW.KBOU.FW.W.0033.260413T1700Z-260414T0200Z/
Northeast Weld County-
1150 AM MDT Sun Apr 12 2026

...RED FLAG WARNING IN EFFECT FROM 11 AM TO 8 PM MDT MONDAY FOR
WIND AND LOW RELATIVE HUMIDITY FOR NORTHEASTERN WELD COUNTY...

The National Weather Service in Denver has issued a Red Flag
Warning for wind and low relative humidity, which is in effect
from 11 AM to 8 PM MDT Monday. The Fire Weather Watch is no
longer in effect.

* AFFECTED AREA...Fire Weather Zone 242.

* TIMING...From 11 AM to 8 PM MDT Monday.

* 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.

&&

$$

445 
WWUS85 KBOU 130200
RFWBOU

URGENT - FIRE WEATHER MESSAGE
National Weather Service Denver/Boulder CO
800 PM MDT Sun Apr 12 2026


COZ214-216-238-241-246-247-131000-
/O.EXP.KBOU.FW.W.0032.000000T0000Z-260413T0200Z/
/O.CON.KBOU.FW.W.0033.260413T1700Z-260414T0200Z/
Central and Southeast Park County-
Jefferson and West Douglas Counties Above 6000 Feet/Gilpin/Clear
Creek/Northeast Park Counties Below 9000 Feet-
Larimer County Below 6000 Feet/Northwest Weld County-
Elbert/Central and East Douglas Counties Above 6000 Feet-
North and Northeast Elbert County Below 6000 Feet/North Lincoln
County-
Southeast Elbert County Below 6000 Feet/South Lincoln County-
800 PM MDT Sun Apr 12 2026

...RED FLAG WARNING REMAINS IN EFFECT FROM 11 AM TO 8 PM MDT
MONDAY FOR WIND AND LOW RELATIVE HUMIDITY FOR SOUTH PARK, THE
SOUTHERN FRONT RANGE FOOTHILLS, PALMER DIVIDE INTO EAST CENTRAL
COLORADO, AND EASTERN LARIMER AND NORTHWEST WELD COUNTIES...
...RED FLAG WARNING WILL EXPIRE AT 8 PM MDT THIS EVENING FOR WIND
AND LOW RELATIVE HUMIDITY FOR SOUTH PARK, THE SOUTHERN FRONT
RANGE FOOTHILLS, PALMER DIVIDE INTO EAST CENTRAL COLORADO, AND
EASTERN LARIMER AND NORTHWEST WELD COUNTIES...

* AFFECTED AREA...Fire Weather Zones 214, 216, 238, 241, 246 and 
  247.

* TIMING...From 11 AM to 8 PM MDT Monday.

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

* RELATIVE HUMIDITY...As low as 9 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.

&&

$$

COZ249-130300-
/O.EXP.KBOU.FW.W.0032.000000T0000Z-260413T0200Z/
Washington County-
800 PM MDT Sun Apr 12 2026

...RED FLAG WARNING WILL EXPIRE AT 8 PM MDT THIS EVENING FOR WIND
AND LOW RELATIVE HUMIDITY FOR WASHINGTON COUNTY...

Winds have become light and humidity will slowly rise overnight.

$$

COZ242-131000-
/O.CON.KBOU.FW.W.0033.260413T1700Z-260414T0200Z/
Northeast Weld County-
800 PM MDT Sun Apr 12 2026

...RED FLAG WARNING REMAINS IN EFFECT FROM 11 AM TO 8 PM MDT
MONDAY FOR WIND AND LOW RELATIVE HUMIDITY FOR NORTHEASTERN WELD
COUNTY...

* AFFECTED AREA...Fire Weather Zone 242.

* TIMING...From 11 AM to 8 PM MDT Monday.

* 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.

&&

$$

Area Forecast Discussion
National Weather Service Denver/Boulder CO
532 PM MDT Sat Apr 11 2026

.KEY MESSAGES...

- Scattered showers and thunderstorms producing gusty winds
  through early evening. Gusty outflow winds (30-45 mph) will be
  common. A couple stronger gusts to 60 mph are possible.

- Warm and dry Sunday and Monday, with breezy/windy conditions
  along with elevated to locally critical fire conditions.

- Weakening disturbance for Tuesday with a chance of mainly light
  showers, then dry weather returns for Wednesday and Thursday.

&&

.DISCUSSION /Through Saturday/...
Issued at 108 PM MDT Sat Apr 11 2026

Water vapor satellite imagery shows a shortwave trough over the
Great Basin at this time. As it tracks northeastward, lift will
spread across the area. Skies have been slow to clear this
morning, but the airmass will destabilize this afternoon. Moisture
will be limited. Even though dew points this morning were in the
30s and 40s, the shallow moisture will mix with the drier air
aloft, causing dew points to fall into the 20s to lower 30s.
SBCAPE climbs to 500 J/kg, which isn't that impressive. However,
DCAPE reaches 1000 J/kg, thus storms will be capable of gusty
outflow winds, with the strongest reaching around 60 mph. Best
chance for storms and strong winds will be mid to late afternoon
along the Front Range and late afternoon to early evening over the
eastern plains. Threat for showers/storms ends around sunset as
the airmass stabilizes and the shortwave lifts northeast of the
area. 

Southwest flow aloft continues for Sunday and Monday bringing
warm and dry weather. On Sunday, the higher terrain mixes into
stronger southwest winds aloft, leading to gusts around 30 mph.
The threat for gusty winds over the plains will not be as great
due to a forming surface low over northeast Colorado. Weaker
southwest winds to variable are expected under the low. Stronger
winds, which lead to critical fire weather conditions, should
remain over the southern half of the Colorado plains. The Fire
Weather Watch was canceled for most of the northeast plains, but a
strip of zones across our southern area remains under the watch
due to stronger winds, which may still bring gusts up to 30 mph. 
Similar weather conditions are expected for Monday, with gusty
southwest winds, strongest over the higher terrain. Moisture
begins to increase from the west as a broad, disorganized upper
level trough approaches the Central Rockies. This will lead to
slightly higher relative humidities over the higher terrain. A few
weak showers will also be possible, beginning in the afternoon. 

The chance for showers continues Monday night over the mountains
ahead of the upper level trough. We expect cooler temperatures and
a chance for showers to spread across the area Tuesday. A good
amount uncertainty remains regarding the location and timing of
the shortwave trough(s) embedded in the larger upper level trough.
Precipitation amounts from this system look to be on the light
side. 

On Wednesday, weak ridging moves across Colorado. Drier conditions
return and temperatures begin to warm. Flow aloft backs to the
southwest Thursday ahead of the next upper level trough to the
west. Temperatures warm into the 70s across northeast Colorado,
and dry conditions continue. The upper level trough moves across
Colorado sometime Friday and/or Saturday. Ensembles show a very
large spread in how this system evolves, but the general trend is
cooler temperatures (not surprising) and a weaker system with
showers. 

&&

.AVIATION /00Z TAFS through 00Z Monday/...
Issued at 528 PM MDT Sat Apr 11 2026

Threat of high based showers with gusty winds will persist thru
01z.  There is a low threat (5% chance) for a weak tstm as well.
After 01z most activity should end.  Winds will be chaotic early
this evening due to boundaries from showers.  Eventually winds
will go more SW/SSW by 02Z or 03z. Overnight winds will be mainly
drainage.

On Sun, winds will become more SW by 18z with a few gusts up to
25 mph thru the aftn. VFR conditions will be in place thru the
period.

&&

.BOU WATCHES/WARNINGS/ADVISORIES...
Fire Weather Watch from Sunday afternoon through Sunday evening
for COZ214-216-238-239-241-242-246>251.

&&

DISCUSSION...12
AVIATION...RPK

Hazardous Weather Outlook
National Weather Service Denver/Boulder CO
426 AM MDT Sat Apr 11 2026

COZ030>051-121030-
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-
426 AM MDT Sat Apr 11 2026

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

.DAY ONE...Today and Tonight

Scattered showers and a couple thunderstorms with gusty winds can
be expected across the area this afternoon and early evening.
Cloud to ground lightning, wind gusts to 40-50 mph, and only a
brief period of rain can be expected from any passing storms. One
or two storms on the plains will be capable of producing
localized and sudden wind gusts of 50-60 mph and blowing dust.

.DAYS TWO THROUGH SEVEN...Sunday through Friday

Elevated to critical fire weather conditions will return for
Sunday and Monday due to warmer, dry, and windier weather. The
most widespread critical conditions are shaping up to occur on
Monday.

Cooler weather and scattered showers are still in the forecast
for Tuesday, but the chances of any significant rain are low. Any
snowfall in the mountains will be on the lighter side with
generally minor travel impacts over the higher passes.

.SPOTTER INFORMATION STATEMENT...

Spotter activation is not anticipated today or tonight. However,
any reports of strong, gusty winds will be appreciated.

Special Weather Statement
National Weather Service Denver CO
541 PM MDT Sat Apr 11 2026

COZ040-120015-
North Douglas County Below 6000 Feet/Denver/West Adams and
Arapahoe Counties/East Broomfield County CO-
541 PM MDT Sat Apr 11 2026

...A LINE OF SHOWERS WILL IMPACT NORTHEASTERN DENVER AND WESTERN
ADAMS COUNTIES UNTIL 615 PM MDT...

At 541 PM MDT, Doppler radar was tracking a line of showers extending
from near Lochbuie to 5 miles southeast of Commerce City, or
extending from 25 miles northeast of Denver to 11 miles northeast of
Denver, moving southeast at 25 mph.

HAZARD...Wind gusts up to 50 mph.

SOURCE...Radar indicated.

IMPACT...Gusty winds could knock down tree limbs and blow around
         unsecured objects.

Locations impacted include...
  Eastern Commerce City, Denver International Airport and D.I.A
  Terminal and Concourses.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Monitor the weather situation closely and be alert for threatening
weather conditions.

&&

LAT...LON 3982 10482 3992 10474 4000 10468 3995 10455
      3978 10465 3978 10467
TIME...MOT...LOC 2341Z 300DEG 20KT 4000 10465 3990 10470 3982 10478

MAX HAIL SIZE...0.00 IN
MAX WIND GUST...50 MPH

63