Alert archive / Colorado / Red Flag Warnings in 2026

Red Flag Warning 20, NWS Denver/Boulder, CO

March 12, 202616 counties in Colorado

NWS Denver/Boulder, CO issued this red flag warning at Mar 12, 2026, 12:50 PM MDT for 16 counties in Colorado. It took effect at Mar 13, 2026, 11:00 AM MDT. It was in force for 9 hr. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued
Mar 12, 2026, 12:50 PM MDT (18:50 UTC)
In effect from
Mar 13, 2026, 11:00 AM MDT
Expired
Mar 13, 2026, 8:00 PM MDT
In force
9 hr
Issued by
NWS Denver/Boulder, CO

Counties Adams County, CO, Arapahoe County, CO, Boulder County, CO, Broomfield County, CO, Denver County, CO, Douglas County, CO, Elbert County, CO, Jefferson County, CO, Larimer County, CO, Lincoln County, CO, Logan County, CO, Morgan County, CO, Phillips County, CO, Sedgwick County, CO, Washington County, CO, Weld County, CO

The radar

The Denver radar (KFTG), 42 km from the middle of the area, began a volume at 18:54 UTC, the scan nearest the moment this went out.

Open the radar archive at this moment

The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.

The text

As transmitted.

494 
WWUS85 KBOU 121850
RFWBOU

URGENT - FIRE WEATHER MESSAGE
National Weather Service Denver/Boulder CO
1250 PM MDT Thu Mar 12 2026

COZ238>249-130400-
/O.UPG.KBOU.FW.A.0015.260313T1700Z-260314T0200Z/
/O.NEW.KBOU.FW.W.0020.260313T1700Z-260314T0200Z/
/O.NEW.KBOU.FW.A.0016.260314T1700Z-260315T0300Z/
/O.CON.KBOU.FW.W.0019.000000T0000Z-260313T0300Z/
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-
1250 PM MDT Thu Mar 12 2026

...RED FLAG WARNING REMAINS IN EFFECT UNTIL 9 PM MDT THIS EVENING
FOR WIND AND LOW RELATIVE HUMIDITY FOR THE URBAN CORRIDOR AND
PLAINS... 
...RED FLAG WARNING IN EFFECT FROM 11 AM TO 8 PM MDT 
FRIDAY FOR WIND AND LOW RELATIVE HUMIDITY FOR THE URBAN CORRIDOR
AND MAJORITY OF THE PLAINS... 
...FIRE WEATHER WATCH IN EFFECT FROM SATURDAY MORNING THROUGH 
SATURDAY EVENING FOR WIND AND LOW RELATIVE HUMIDITY FOR THE URBAN 
CORRIDOR AND MAJORITY OF THE PLAINS...

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 Friday. A Fire Weather Watch has also been
issued. This Fire Weather Watch for wind and low relative
humidity is in effect from Saturday morning through Saturday
evening. The Fire Weather Watch is no longer in effect.

* AFFECTED AREA...Fire Weather Zones 238, 239, 240, 241, 242, 
  243, 244, 245, 246, 247, 248 and 249.

* TIMING...For the first Red Flag Warning, until 9 PM MDT this 
  evening. For the second Red Flag Warning, from 11 AM to 8 PM 
  MDT Friday. For the Fire Weather Watch, from Saturday morning 
  through Saturday evening.

* WINDS...On Thursday, west 30 to 60 mph with gusts up to 90 mph,
  strongest winds near the Cheyenne Ridge. On Friday, west winds
  25 to 35 with gusts around 35 to 50 mph. On Saturday, west winds
  25 to 35 with gusts around 40 to 60 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.

&&

$$

COZ250-251-130300-
/O.CON.KBOU.FW.W.0019.000000T0000Z-260313T0300Z/
Sedgwick County-Phillips County-
1250 PM MDT Thu Mar 12 2026

...RED FLAG WARNING REMAINS IN EFFECT UNTIL 9 PM MDT THIS EVENING
FOR WIND AND LOW RELATIVE HUMIDITY FOR SEDGWICK AND PHILLIPS
COUNTIES...

* AFFECTED AREA...Fire Weather Zones 250 and 251.

* TIMING...Until 9 PM MDT this evening.

* WINDS...West 25 to 35 mph with gusts up to 60 mph.

* RELATIVE HUMIDITY...As low as 14 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.

&&

$$
4 follow-up statements
195 
WWUS85 KBOU 130258
RFWBOU

URGENT - FIRE WEATHER MESSAGE
National Weather Service Denver/Boulder CO
858 PM MDT Thu Mar 12 2026

COZ238>249-132100-
/O.EXP.KBOU.FW.W.0019.000000T0000Z-260313T0300Z/
/O.UPG.KBOU.FW.A.0016.260314T1700Z-260315T0300Z/
/O.NEW.KBOU.FW.W.0021.260314T1700Z-260315T0300Z/
/O.CON.KBOU.FW.W.0020.260313T1700Z-260314T0200Z/
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-
858 PM MDT Thu Mar 12 2026

...RED FLAG WARNING REMAINS IN EFFECT FROM 11 AM TO 8 PM MDT
FRIDAY FOR WIND AND LOW RELATIVE HUMIDITY FOR THE URBAN CORRIDOR
AND PLAINS...
...RED FLAG WARNING IN EFFECT FROM 11 AM TO 9 PM MDT SATURDAY FOR
WIND AND LOW RELATIVE HUMIDITY FOR THE URBAN CORRIDOR AND PLAINS...
...RED FLAG WARNING WILL EXPIRE AT 9 PM MDT THIS EVENING FOR WIND
AND LOW RELATIVE HUMIDITY FOR THE URBAN CORRIDOR AND PLAINS...

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 9 PM MDT Saturday. The Fire Weather Watch is no
longer in effect.

* AFFECTED AREA...Fire Weather Zones 238, 239, 240, 241, 242, 
  243, 244, 245, 246, 247, 248 and 249.

* TIMING...For Friday, from 11 AM to 8 PM MDT. For Saturday, from
  11 AM to 9 PM MDT Saturday.

* WINDS...On Friday, west winds 15 to 25 mph with gusts 25 to 40
  mph. On Saturday, west winds 20 to 30 mph with gusts 35 to 50
  mph.

* RELATIVE HUMIDITY...On Friday, 12 to 17 percent. On Saturday, 10
  to 15 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.

&&

$$

COZ250-251-132100-
/O.EXP.KBOU.FW.W.0019.000000T0000Z-260313T0300Z/
/O.NEW.KBOU.FW.W.0021.260314T1700Z-260315T0300Z/
/O.EXA.KBOU.FW.W.0020.260313T1700Z-260314T0200Z/
Sedgwick County-Phillips County-
858 PM MDT Thu Mar 12 2026

...RED FLAG WARNING IN EFFECT FROM 11 AM TO 8 PM MDT FRIDAY FOR
WIND AND LOW RELATIVE HUMIDITY FOR SEDGWICK AND PHILLIPS COUNTIES...
...RED FLAG WARNING IN EFFECT FROM 11 AM TO 9 PM MDT SATURDAY FOR
WIND AND LOW RELATIVE HUMIDITY FOR SEDGWICK AND PHILLIPS COUNTIES...
...RED FLAG WARNING WILL EXPIRE AT 9 PM MDT THIS EVENING FOR WIND
AND LOW RELATIVE HUMIDITY FOR SEDGWICK AND PHILLIPS 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 Friday. A Red Flag Warning has also been
issued from 11 AM to 9 PM MDT Saturday.

* AFFECTED AREA...Fire Weather Zones 250 and 251.

* TIMING...For Friday, from 11 AM to 8 PM MDT. For Saturday, from
  11 AM to 9 PM MDT Saturday.

* WINDS...On Friday, west winds 15 to 20 mph with gusts up to 35
  mph. On Saturday, west winds 15 to 25 mph with gusts up to 40
  mph.

* RELATIVE HUMIDITY...As low as 13 to 18 percent both days.

* 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.

&&

$$

Rodriguez
873 
WWUS85 KBOU 130906
RFWBOU

URGENT - FIRE WEATHER MESSAGE
National Weather Service Denver/Boulder CO
306 AM MDT Fri Mar 13 2026

COZ238>251-140015-
/O.CON.KBOU.FW.W.0020.260313T1700Z-260314T0200Z/
/O.CON.KBOU.FW.W.0021.260314T1700Z-260315T0300Z/
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-
306 AM MDT Fri Mar 13 2026

...RED FLAG WARNING REMAINS IN EFFECT FROM 11 AM THIS MORNING TO
8 PM MDT THIS EVENING FOR WIND AND LOW RELATIVE HUMIDITY FOR THE
URBAN CORRIDOR AND PLAINS...
...RED FLAG WARNING REMAINS IN EFFECT FROM 11 AM TO 9 PM MDT
SATURDAY FOR WIND AND LOW RELATIVE HUMIDITY FOR THE URBAN
CORRIDOR AND PLAINS...

* AFFECTED AREA...Fire Weather Zones 238, 239, 240, 241, 242, 
  243, 244, 245, 246, 247, 248, 249, 250 and 251.

* TIMING...For the first Red Flag Warning, from 11 AM this 
  morning to 8 PM MDT this evening. For the second Red Flag 
  Warning, from 11 AM to 9 PM MDT Saturday.

* WINDS...Today, west winds 15 to 25 mph with gusts 25 to 40 mph.
  On Saturday, west winds 20 to 30 mph with gusts 35 to 50 mph.

* RELATIVE HUMIDITY...Today, 12 to 17 percent. On Saturday, 10 to
  15 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.

&&

$$
558 
WWUS85 KBOU 132320
RFWBOU

URGENT - FIRE WEATHER MESSAGE
National Weather Service Denver/Boulder CO
520 PM MDT Fri Mar 13 2026

COZ238>251-140200-
/O.CON.KBOU.FW.W.0020.000000T0000Z-260314T0200Z/
/O.CON.KBOU.FW.W.0021.260314T1700Z-260315T0300Z/
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-
520 PM MDT Fri Mar 13 2026

...RED FLAG WARNING REMAINS IN EFFECT UNTIL 8 PM MDT THIS EVENING
FOR WIND AND LOW RELATIVE HUMIDITY FOR THE URBAN CORRIDOR AND
PLAINS...
...RED FLAG WARNING REMAINS IN EFFECT FROM 11 AM TO 9 PM MDT
SATURDAY FOR WIND AND LOW RELATIVE HUMIDITY FOR THE URBAN
CORRIDOR AND PLAINS...

* AFFECTED AREA...Fire Weather Zones 238, 239, 240, 241, 242, 
  243, 244, 245, 246, 247, 248, 249, 250 and 251.

* TIMING...For the first Red Flag Warning, until 8 PM MDT this 
  evening. For the second Red Flag Warning, from 11 AM to 9 PM 
  MDT Saturday.

* WINDS...Today, west winds 15 to 25 mph with gusts 25 to 35 mph.
  On Saturday, west winds 20 to 30 mph with gusts 35 to 60 mph,
  strongest west of I-25.

* RELATIVE HUMIDITY...Today, 12 to 17 percent. On Saturday, 8 to 
  15 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.

&&

$$

Rodriguez
128 
WWUS85 KBOU 140158
RFWBOU

URGENT - FIRE WEATHER MESSAGE
National Weather Service Denver/Boulder CO
758 PM MDT Fri Mar 13 2026

COZ238>251-141200-
/O.EXP.KBOU.FW.W.0020.000000T0000Z-260314T0200Z/
/O.CON.KBOU.FW.W.0021.260314T1700Z-260315T0300Z/
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-
758 PM MDT Fri Mar 13 2026

...RED FLAG WARNING REMAINS IN EFFECT FROM 11 AM TO 9 PM MDT
SATURDAY FOR WIND AND LOW RELATIVE HUMIDITY FOR THE URBAN
CORRIDOR AND PLAINS...
...RED FLAG WARNING WILL EXPIRE AT 8 PM MDT THIS EVENING FOR WIND
AND LOW RELATIVE HUMIDITY FOR THE URBAN CORRIDOR AND PLAINS...

* AFFECTED AREA...Fire Weather Zones 238, 239, 240, 241, 242, 
  243, 244, 245, 246, 247, 248, 249, 250 and 251.

* TIMING...From 11 AM to 9 PM MDT Saturday.

* WINDS...West winds 20 to 35 mph with gusts 35 to 60 mph,
  strongest west of I-25 mid to late afternoon.

* RELATIVE HUMIDITY...As low as 7 to 14%.

* 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.

&&

$$

Rodriguez

What forecasters said that day

The local office's own words before this red flag warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Denver/Boulder, CO wrote its last area forecast discussion before this red flag warning went out at Mar 12, 5:47 AM MDT, 7 hours 3 minutes earlier. Its key messages:

  • Prolonged period of critical fire weather conditions today through Saturday as successive high wind events and dry conditions impact our forecast area.
  • Mountain snow expected to develop late Saturday following a cold front, with precipitation potential and much cooler temperatures extending into the lower elevations through Sunday.
  • Rapid warming begins Monday into Tuesday, potentially culminating in record-breaking temperatures mid to late next week.
Area forecast discussion, Mar 12, 5:47 AM MDT, 7 hours 3 minutes before
Area Forecast Discussion
National Weather Service Denver/Boulder CO
547 AM MDT Thu Mar 12 2026

.KEY MESSAGES...

- Prolonged period of critical fire weather conditions today through
  Saturday as successive high wind events and dry conditions
  impact our forecast area.

- Mountain snow expected to develop late Saturday following a cold
  front, with precipitation potential and much cooler temperatures
  extending into the lower elevations through Sunday.

- Rapid warming begins Monday into Tuesday, potentially
  culminating in record-breaking temperatures mid to late next
  week.

&&

.DISCUSSION /Through Wednesday/...
Issued at 1223 AM MDT Thu Mar 12 2026

A prolonged period of enhanced downslope winds and high fire danger
is on our doorstep, with gusts already picking up on our leeside
slopes as surface pressure gradients tighten (~2mb increase in the
past 2-3 hrs for Grand Junction - Denver gradients). This trend will
continue through this afternoon as a pronounced surface low
amplifies over the Upper Midwest and gradients peak, driving 55-65
kt cross-barrier flow over the Front Range. Agreement is unanimous
regarding the development of a potent mountain wave over the central
foothills beginning near or just after daybreak and producing gusts
of 80-100 mph, focused primarily above 7,000 ft and east of the Peak-
to-Peak corridor with the strongest gusts after 11 AM. Ridgetop wind
directions remain marginal with just enough of a northwest component
aloft to likely limit downslope amplification into lower elevation
urban areas and, despite some favorable shear profiles, signs of a
true critical layer are still few and far between. These two factors
may be contributing to the vast majority of high-res guidance
confining the more extreme gusts to our foothills. Nonetheless,
typically wind-prone locations (Cheyenne Ridge into the base of the
foothills N/W of Fort Collins, and down through Lyons into the
Highway 93 corridor) will be susceptible to gusts 60-75 mph at
times. Elsewhere, gusts 45 to 60 mph can be expected, with areas
along/south of I-70 seeing the weakest winds (gusts more sporadic
and largely below 40 mph). All this said, critical fire weather
conditions will be widespread and extend into portions of our lower
foothills.

Winds relax slightly tonight and retreat into the higher elevations,
whilst a backdoor cold front slides SW into our northeast plains
bringing locally below-freezing temperatures overnight.

Wind and fire weather remain the story for Friday, albeit will a
moderation in wind speeds for most areas with exception of the
higher foothills/mountains, where winds will remain strong through
the morning hours. However, deep mixing and healthy flow aloft
will still ensure development of breezy conditions with widespread
gusts 25 to 45 mph for the plains/I-25 corridor, strongest near
the WY/NE state line. With another dry day on tap, a Fire Weather
Watch has been issued for the majority of our lower elevations.

Downslope winds are set to strengthen once more Saturday afternoon
with a developing shortwave to our north and approaching jet max on
its backside. Peak wind strength does not look as high as with
today's event, with cross-sections appearing less favorable for a
pronounced mountain wave. However, we will be plenty warm (into the
70's) and well-mixed, with increasing QG subsidence through the day
helping promote effective spread of windy conditions into all areas,
with gusts 35-50 mph during the day for the lower elevations.
Sustained low humidity will lead to another high-confidence
critical fire weather day. Come Saturday evening, a sharp front is
poised to descend into our area, bringing a shot of strong NW to N
winds lasting through Sunday. The jet placement, which has inched
a little south in the latest guidance, combined with strong
frontogenesis, suggests good potential for some banded snowfall
impacting not just our mountains but also the lower elevations
overnight into early Sunday, although it will be a quick-hitting
system with considerable subsidence following shortly behind.
There's higher confidence in travel impacts with several inches of
snow for our mountains, but a few inches of snow accumulation are
also within reach for our I-25 corridor, especially if we can get
some efficient (albeit brief) banding. After Sunday's little
taste of winter, a rapid warm-up is expected to begin Monday as
high pressure builds into the southwestern US, and will only
accelerate through the week as the ridge axis expands eastward.
Record-breaking temperatures are increasingly likely by the
middle of next week.

&&

.AVIATION /12Z TAFS through 12Z Friday/...
Issued at 547 AM MDT Thu Mar 12 2026

Main concern will be winds, as it is far more complicated today.
As a strong mountain wave develops, gusty westerly winds will
slowly emerge across the Denver metro. Like many events, this
looks to first develop as a few channels of stronger W/WNW flow,
with weaker easterlies or VRB winds elsewhere. While gusty winds
are already ongoing at KBJC, most guidance first mixes down some
stronger winds by around 15-18z, with more widespread and
persistent W/WNW gusts to 30-38 kts by 20-22Z. Given KBJC obs and
northern metro Denver obs, can't rule out some westerly earlier
than 15Z at KDEN. KBJC will be more prone to stronger west winds
throughout the day, with a few gusts of 38-48 kts expected - at
this time the strongest winds (gusts >50 kts) are expected to hold
in the foothills. Winds should slowly decrease closer to 00z
Friday, though a few of those channels of winds could continue til
~06Z. We'll handle these variations, or at least potential
variations, with TEMPO groups for what we would think would be the
less persistent of the wind observations. Also note LLWS will be
possible anytime those surface winds are VRB or light easterly.

A more normal southerly winds flow is expected to develop at KDEN
and KAPA by 06Z Friday, but still a 30-40% chance of gusty west
winds due to mountain wave reflections. KBJC may still see a few
puffs of stronger west winds after that time, although a weakening
mountain wave means they, too, will likely transition to more of
a S/SE flow.

VFR conditions will persist with only SCT-BKN high clouds.

&&

.FIRE WEATHER...
Issued at 1223 AM MDT Thu Mar 12 2026

Prolonged critical fire weather conditions are in store for today
through Saturday as downslope winds, strong at times, impact the
foothills and much of the lower elevations. The strongest winds of
the period are expected today for areas west of I-25 and along our
northern plains, where gusts 45 to 60 mph can be expected.
Humidity will fall to or below 15% for a broad swath of the lower
elevations (closer to 15-20% for the windier locations and into
the lower foothills), with high confidence in development of Red
Flag conditions. Humidity recoveries near the base of the
foothills will be poor to moderate at best tonight, and may not
exceed 25-30% in spots.

Peak wind strength will be tapered Friday, but breezy conditions
will arguably be more widespread for the plains with gusts 30-50
mph being common. Daytime humidity levels will see little change
relative to today, and overnight recoveries will remain limited
near the base of the foothills into Saturday morning.

Winds are set to re-strengthen Saturday, especially in the
afternoon, and it's expected to be the warmest and driest day of
this 3-day period. Critical conditions will again be widespread
and may extend into portions of the lower foothills where fuels
are susceptible/snow cover is limited. A potent cold front is
expected to arrive Saturday evening, bringing a shot of strong
N/NW winds along with a high likelihood of accumulating snow to
many areas through early Sunday.

&&

.BOU WATCHES/WARNINGS/ADVISORIES...
High Wind Warning until noon MDT Friday for COZ033>035.

High Wind Warning from 10 AM this morning to noon MDT Friday for
COZ036.

High Wind Warning from 10 AM this morning to 7 PM MDT this
evening for COZ038-042-048.

Red Flag Warning from 11 AM this morning to 9 PM MDT this
evening for COZ238>251.

Fire Weather Watch from Friday morning through Friday evening
for COZ238>249.

&&

DISCUSSION...BRQ
AVIATION...20
FIRE WEATHER...BRQ
Hazardous weather outlook, Mar 12, 3:25 AM MDT, 9 hours 25 minutes before
Hazardous Weather Outlook
National Weather Service Denver/Boulder CO
325 AM MDT Thu Mar 12 2026

COZ030>051-130930-
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-
325 AM MDT Thu Mar 12 2026

...HIGH WIND WARNING FOR THE FRONT RANGE MOUNTAINS, FOOTHILLS, AND
PLAINS NEAR THE WYOMING BORDER...
...RED FLAG WARNING FOR ALL OF THE PLAINS TODAY...
...FIRE WEATHER WATCH FOR ALL OF THE PLAINS SATURDAY...

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

.DAY ONE...Today and Tonight

High winds will develop over the Front Range Mountains and
Foothills early this morning and become more widespread through
the afternoon. Peak gusts of 80-100 mph can be expected in wind
prone areas of the Front Range, resulting in hazardous travel and
potential for tree damage and scattered power outages. Some of
those stronger winds will spread into the western sections of
Fort Collins and Wellington, with gusts of 60-75 mph expected
there. Peak gusts on the plains will reach 60 mph near the Wyoming
border, but mostly 30-50 mph over the rest of the plains and I-25
Corridor south of Fort Collins. There is potential for rapid
wildfire spread across the plains from late morning through the
mid evening hours due to the strong winds and very low humidity.

.DAYS TWO THROUGH SEVEN...Friday through Wednesday

The hazardous fire weather conditions will last through Friday and
Saturday, with continued much above normal temperatures, gusty
winds, and very low humidity.

A strong, fast moving cold front will bring more gusty winds but
a chance of snow by Saturday night and Sunday, with a few inches
of accumulation and travel impacts likely for the mountains. The
I-25 Corridor could see mainly light snow accumulations and
travel impacts by late Saturday night and early Sunday morning.

A quick warmup and a high potential for record warmth can be
expected by the middle of next week.

.SPOTTER INFORMATION STATEMENT...

Spotter activation will not be needed, but any reports of high
wind or wind damage will be appreciated.

In the hours before

Local storm report, Mar 12, 9:39 AM MDT, 3 hours 11 minutes before
Preliminary Local Storm Report
National Weather Service Denver CO
939 AM MDT Thu Mar 12 2026

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0905 AM     Non-Tstm Wnd Gst 1 NE Crisman            40.05N 105.35W
03/12/2026  M83 MPH          Boulder            CO   Mesonet

            Mesonet station EW4338 1 NE Crisman.

0850 AM     Non-Tstm Wnd Gst 2 NNE Natural Fort      40.99N 104.91W
03/12/2026  M79 MPH          Weld               CO   Mesonet

            Mesonet station CO041 I-25 at Wyoming
            Border.

0819 AM     Non-Tstm Wnd Gst 6 SW Carr               40.84N 104.97W
03/12/2026  M79 MPH          Larimer            CO   Mesonet

            Mesonet station CO166 I-25 and Buckeye Rd.

0918 AM     Non-Tstm Wnd Gst 4 SSE Carr              40.84N 104.85W
03/12/2026  M78 MPH          Weld               CO   Mesonet

            Mesonet station UP288 Carr South.

0919 AM     Non-Tstm Wnd Gst 3 SW Rocky Flats        39.87N 105.24W
03/12/2026  M77 MPH          Jefferson          CO   Mesonet

            Mesonet station CO109 Rocky Flats Hwy 93 and
            72.

0630 AM     Non-Tstm Wnd Gst 4 NNW White Ranch Open  39.87N 105.32W
03/12/2026  M75 MPH          Jefferson          CO   Mesonet

            Mesonet station 1925W Coal Creek Canyon.

0745 AM     Non-Tstm Wnd Gst 4 NE Nederland          39.99N 105.45W
03/12/2026  M75 MPH          Boulder            CO   Public

0735 AM     Non-Tstm Wnd Gst 3 ESE Buckeye           40.81N 105.04W
03/12/2026  M74 MPH          Larimer            CO   Mesonet

            Mesonet station BEYC2 Buckeye.

0845 AM     Non-Tstm Wnd Gst 4 ESE Estes Park        40.36N 105.45W
03/12/2026  M73 MPH          Larimer            CO   Mesonet

            Mesonet station DW0774 Estes Park.

0850 AM     Non-Tstm Wnd Gst 4 ENE Nederland         39.99N 105.45W
03/12/2026  M73 MPH          Boulder            CO   Mesonet

            Mesonet station DW5338 Nederland.

0315 AM     Non-Tstm Wnd Gst 3 SE Tolland            39.87N 105.55W
03/12/2026  M72 MPH          Gilpin             CO   AWOS

            AWOS station KC99 Dakota Hill.

0818 AM     Non-Tstm Wnd Gst 2 ENE Marshall          39.97N 105.19W
03/12/2026  M72 MPH          Boulder            CO   Mesonet

            Mesonet station CO167 Louisville US 36
            Overlook.

0524 AM     Non-Tstm Wnd Gst 2 WNW Aspen Springs     39.84N 105.52W
03/12/2026  M70 MPH          Gilpin             CO   Mesonet

            Mesonet station PKLC2 Pickle Gulch.

0830 AM     Non-Tstm Wnd Gst 4 ENE Nederland         39.99N 105.45W
03/12/2026  M65 MPH          Boulder            CO   NWS Employee

            2 trees blown down.

&&
Local storm report, Mar 12, 12:00 PM MDT, 50 minutes before
Preliminary Local Storm Report
National Weather Service Denver CO
1200 PM MDT Thu Mar 12 2026

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0940 AM     Non-Tstm Wnd Gst Sunshine                40.07N 105.37W
03/12/2026  M92 MPH          Boulder            CO   Public

0941 AM     Non-Tstm Wnd Gst 2 NNE Natural Fort      40.99N 104.91W
03/12/2026  M89 MPH          Weld               CO   Mesonet

            Mesonet station CO041 I-25 at Wyoming
            Border.

1000 AM     Non-Tstm Wnd Gst 1 NE Crisman            40.05N 105.35W
03/12/2026  M87 MPH          Boulder            CO   Mesonet

            Mesonet station EW4338 1 NE Crisman.

1113 AM     Non-Tstm Wnd Gst 5 NNW Nunn              40.77N 104.81W
03/12/2026  M87 MPH          Weld               CO   Mesonet

            Mesonet station UP718 4.9 N Nunn (UPR).

1031 AM     Non-Tstm Wnd Gst 2 WNW Marshall          39.96N 105.27W
03/12/2026  M85 MPH          Boulder            CO   Mesonet

            Mesonet station TT787 Boulder Flatiron.

0905 AM     Non-Tstm Wnd Gst 1 NE Crisman            40.05N 105.35W
03/12/2026  M83 MPH          Boulder            CO   Mesonet

            Mesonet station EW4338 1 NE Crisman.

1122 AM     Non-Tstm Wnd Gst 6 SW Carr               40.84N 104.97W
03/12/2026  M82 MPH          Larimer            CO   Mesonet

            Mesonet station CO166 I-25 and Buckeye Rd.

0929 AM     Non-Tstm Wnd Gst 3 SW Rocky Flats        39.87N 105.24W
03/12/2026  M81 MPH          Jefferson          CO   Mesonet

            Mesonet station CO109 Rocky Flats Hwy 93 and
            72.

0935 AM     Non-Tstm Wnd Gst 3 ESE Buckeye           40.81N 105.04W
03/12/2026  M80 MPH          Larimer            CO   Mesonet

            Mesonet station BEYC2 Buckeye.

0819 AM     Non-Tstm Wnd Gst 6 SW Carr               40.84N 104.97W
03/12/2026  M79 MPH          Larimer            CO   Mesonet

            Mesonet station CO166 I-25 and Buckeye Rd.

0850 AM     Non-Tstm Wnd Gst 2 NNE Natural Fort      40.99N 104.91W
03/12/2026  M79 MPH          Weld               CO   Mesonet

            Mesonet station CO041 I-25 at Wyoming
            Border.

1120 AM     Non-Tstm Wnd Gst Aspen Springs           39.83N 105.48W
03/12/2026  M79 MPH          Gilpin             CO   Mesonet

            Mesonet station CW5066 Aspen Springs.

1126 AM     Tstm Wnd Gst     4 NE Nederland          39.99N 105.45W
03/12/2026  M79 MPH          Boulder            CO   Public

0918 AM     Non-Tstm Wnd Gst 4 SSE Carr              40.84N 104.85W
03/12/2026  M78 MPH          Weld               CO   Mesonet

            Mesonet station UP288 Carr South.

1130 AM     Non-Tstm Wnd Gst 4 ENE Nederland         39.99N 105.45W
03/12/2026  M78 MPH          Boulder            CO   Mesonet

            Mesonet station DW5338 Nederland.

1132 AM     Non-Tstm Wnd Gst 1 E Idaho Springs       39.74N 105.50W
03/12/2026  M78 MPH          Clear Creek        CO   Mesonet

            Mesonet station CO143 I-70 Idaho Springs.

0919 AM     Non-Tstm Wnd Gst 3 SW Rocky Flats        39.87N 105.24W
03/12/2026  M77 MPH          Jefferson          CO   Mesonet

            Mesonet station CO109 Rocky Flats Hwy 93 and
            72.

1058 AM     Non-Tstm Wnd Gst 2 WNW Brookvale         39.64N 105.46W
03/12/2026  M76 MPH          Clear Creek        CO   Mesonet

            Mesonet station CEKC2 Corral Creek.

0630 AM     Non-Tstm Wnd Gst 4 NNW White Ranch Open  39.87N 105.32W
03/12/2026  M75 MPH          Jefferson          CO   Mesonet

            Mesonet station 1925W Coal Creek Canyon.

0735 AM     Non-Tstm Wnd Gst 3 ESE Buckeye           40.81N 105.04W
03/12/2026  M74 MPH          Larimer            CO   Mesonet

            Mesonet station BEYC2 Buckeye.

0845 AM     Non-Tstm Wnd Gst 4 ESE Estes Park        40.36N 105.45W
03/12/2026  M73 MPH          Larimer            CO   Mesonet

            Mesonet station DW0774 Estes Park.

0850 AM     Non-Tstm Wnd Gst 4 ENE Nederland         39.99N 105.45W
03/12/2026  M73 MPH          Boulder            CO   Mesonet

            Mesonet station DW5338 Nederland.

0952 AM     Non-Tstm Wnd Gst 5 S Lyons               40.15N 105.27W
03/12/2026  M73 MPH          Boulder            CO   Mesonet

            Mesonet station EW8833 Longmont.

1115 AM     Non-Tstm Wnd Gst 2 SSW Laporte           40.59N 105.14W
03/12/2026  M73 MPH          Larimer            CO   Mesonet

            Mesonet station FCC01 Christman Air Field.

1131 AM     Non-Tstm Wnd Gst 4 SSW Lyons             40.17N 105.30W
03/12/2026  M73 MPH          Boulder            CO   Mesonet

            Mesonet station TT789 Heil Ranch.

0315 AM     Non-Tstm Wnd Gst 3 SE Tolland            39.87N 105.55W
03/12/2026  M72 MPH          Gilpin             CO   AWOS

            AWOS station KC99 Dakota Hill.

0818 AM     Non-Tstm Wnd Gst 2 ENE Marshall          39.97N 105.19W
03/12/2026  M72 MPH          Boulder            CO   Mesonet

            Mesonet station CO167 Louisville US 36
            Overlook.

1050 AM     Non-Tstm Wnd Gst 1 SW Evergreen          39.62N 105.36W
03/12/2026  M72 MPH          Jefferson          CO   Mesonet

            Mesonet station 1924W Alderfer Three Sisters
            Park.

0946 AM     Non-Tstm Wnd Gst 3 NNE White Ranch Open  39.85N 105.25W
03/12/2026  M71 MPH          Jefferson          CO   Mesonet

            Mesonet station UP709 Clayws.

1142 AM     Non-Tstm Wnd Gst 1 N Georgetown          39.73N 105.69W
03/12/2026  M71 MPH          Clear Creek        CO   Mesonet

            Mesonet station CO162 I-70 Georgetown Lake.

0524 AM     Non-Tstm Wnd Gst 2 WNW Aspen Springs     39.84N 105.52W
03/12/2026  M70 MPH          Gilpin             CO   Mesonet

            Mesonet station PKLC2 Pickle Gulch.

1010 AM     Non-Tstm Wnd Gst 3 SW Jefferson          39.35N 105.84W
03/12/2026  M69 MPH          Park               CO   Mesonet

            Mesonet station CO110 Jefferson.

0830 AM     Non-Tstm Wnd Gst 4 ENE Nederland         39.99N 105.45W
03/12/2026  M65 MPH          Boulder            CO   NWS Employee

            2 trees blown down.

&&

The office that day

Everything else NWS Denver/Boulder, CO issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Mar 11, 11:23 PM MDTFire Weather WatchBOUAdams, Arapahoe, Boulder, Broomfield, Denver, Douglas and 8 more13 hr
Mar 12, 12:50 PM MDTFire Weather WatchBOUAdams, Arapahoe, Boulder, Broomfield, Denver, Douglas and 8 more8 hr

Nearby

Red Flag Warnings in Colorado, 2026Every red flag warning in 2026

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; radar from the NEXRAD Level II archive.