Red Flag Warning 47, NWS Denver/Boulder, CO

358 
WWUS85 KBOU 240150
RFWBOU

URGENT - FIRE WEATHER MESSAGE
National Weather Service Denver/Boulder CO
750 PM MDT Tue Jun 23 2026


COZ214-241000-
/O.EXP.KBOU.FW.W.0046.000000T0000Z-260624T0200Z/
/O.CON.KBOU.FW.W.0047.260624T1700Z-260625T0000Z/
Central and Southeast Park County-
750 PM MDT Tue Jun 23 2026

...RED FLAG WARNING REMAINS IN EFFECT FROM 11 AM TO 6 PM MDT
WEDNESDAY FOR SOUTH PARK FOR FIRE WEATHER ZONE 214...
...RED FLAG WARNING WILL EXPIRE AT 8 PM MDT THIS EVENING FOR
SOUTH PARK FOR FIRE WEATHER ZONE 214...

* AFFECTED AREA...Fire Weather Zone 214.

* TIMING...From 11 AM to 6 PM MDT Wednesday.

* WINDS...Southwest 5 to 15 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.

&&

$$

COZ212-213-241000-
/O.EXP.KBOU.FW.W.0046.000000T0000Z-260624T0200Z/
/O.CON.KBOU.FW.A.0037.260624T1700Z-260625T0000Z/
South and Southeast Grand/West Central and Southwest Boulder/
Gilpin/Clear Creek/Summit/North and West Park Counties Above
9000 Feet-Grand and Summit Counties Below 9000 Feet-
750 PM MDT Tue Jun 23 2026

...FIRE WEATHER WATCH REMAINS IN EFFECT FROM WEDNESDAY MORNING
THROUGH WEDNESDAY AFTERNOON FOR MIDDLE PARK, SUMMIT COUNTY, AND
ITS SURROUNDING MOUNTAINS FOR FIRE WEATHER ZONES 212 AND 213...
...RED FLAG WARNING WILL EXPIRE AT 8 PM MDT THIS EVENING FOR
MIDDLE PARK, SUMMIT COUNTY, AND ITS SURROUNDING MOUNTAINS FOR
FIRE WEATHER ZONES 212 AND 213...

* AFFECTED AREA...Fire Weather Zones 212 and 213.

* TIMING...From Wednesday morning through Wednesday afternoon.

* WINDS...Southwest 5 to 15 mph with gusts up to 30 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 Fire Weather Watch means that critical fire weather conditions
are forecast to occur. Listen for later forecasts and possible
Red Flag Warnings.

&&

$$

COZ217-240300-
/O.EXP.KBOU.FW.W.0046.000000T0000Z-260624T0200Z/
West Jackson and West Grand Counties Above 9000 Feet-
750 PM MDT Tue Jun 23 2026

...RED FLAG WARNING WILL EXPIRE AT 8 PM MDT THIS EVENING FOR THE
PARK RANGE FOR FIRE WEATHER ZONE 217...

Relative humidity is increasing and critical fire weather 
conditions are improving.

$$

001 
WWUS85 KBOU 240832
RFWBOU

URGENT - FIRE WEATHER MESSAGE
National Weather Service Denver/Boulder CO
232 AM MDT Wed Jun 24 2026

COZ212-213-242100-
/O.UPG.KBOU.FW.A.0037.260624T1700Z-260625T0000Z/
/O.EXA.KBOU.FW.W.0047.260624T1700Z-260625T0000Z/
South and Southeast Grand/West Central and Southwest Boulder/
Gilpin/Clear Creek/Summit/North and West Park Counties Above
9000 Feet-Grand and Summit Counties Below 9000 Feet-
232 AM MDT Wed Jun 24 2026

...RED FLAG WARNING IN EFFECT FROM 11 AM THIS MORNING TO 6 PM MDT
THIS EVENING FOR WIND, LOW RELATIVE HUMIDITY AND ISOLATED DRY 
THUNDERSTORMS FOR MIDDLE PARK, AND SUMMIT COUNTY AND ITS 
SURROUNDING MOUNTAINS...

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 this morning to 6 PM MDT this evening. The Fire
Weather Watch is no longer in effect.

* AFFECTED AREA...Fire Weather Zones 212 and 213.

* TIMING...From 11 AM this morning to 6 PM MDT this evening.

* WINDS...Southwest 5 to 15 mph with gusts to 30 mph. Brief gusts
  up to 40 mph possible in the vicinity of any thunderstorms.

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

* THUNDERSTORMS...Isolated dry thunderstorms possible in the
  afternoon and evening.

* 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.

&&

$$

COZ211-217-218-242100-
/O.EXA.KBOU.FW.W.0047.260624T1700Z-260625T0000Z/
Jackson County 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-
232 AM MDT Wed Jun 24 2026

...RED FLAG WARNING IN EFFECT FROM 11 AM THIS MORNING TO 6 PM MDT
THIS EVENING FOR WIND, LOW RELATIVE HUMIDITY AND ISOLATED DRY 
THUNDERSTORMS FOR THE PARK RANGE, NORTH PARK, AND THE NORTHERN 
FRONT RANGE MOUNTAINS...

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 this morning to 6 PM MDT this evening.

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

* TIMING...From 11 AM this morning to 6 PM MDT this evening.

* WINDS...Southwest 5 to 15 mph with gusts to 30 mph. Brief gusts
  up to 40 mph possible in the vicinity of any thunderstorms.

* RELATIVE HUMIDITY...As low as 14 percent.

* THUNDERSTORMS...Isolated dry thunderstorms possible in the
  afternoon and evening.

* 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.

&&

$$

COZ214-242100-
/O.CON.KBOU.FW.W.0047.260624T1700Z-260625T0000Z/
Central and Southeast Park County-
232 AM MDT Wed Jun 24 2026

...RED FLAG WARNING REMAINS IN EFFECT FROM 11 AM THIS MORNING TO
6 PM MDT THIS EVENING FOR WIND, LOW RELATIVE HUMIDITY AND ISOLATED
DRY THUNDERSTORMS FOR SOUTH PARK...

* AFFECTED AREA...Fire Weather Zone 214.

* TIMING...From 11 AM this morning to 6 PM MDT this evening.

* WINDS...Southwest 5 to 15 mph with gusts up to 25 mph.

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

* THUNDERSTORMS...Isolated dry thunderstorms possible in the
  afternoon and evening.

* 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

187 
WWUS85 KBOU 241947
RFWBOU

URGENT - FIRE WEATHER MESSAGE
National Weather Service Denver/Boulder CO
147 PM MDT Wed Jun 24 2026

COZ211>214-217-218-250000-
/O.CON.KBOU.FW.W.0047.000000T0000Z-260625T0000Z/
Jackson County Below 9000 Feet-
South and Southeast Grand/West Central and Southwest Boulder/
Gilpin/Clear Creek/Summit/North and West Park Counties Above
9000 Feet-Grand and Summit Counties Below 9000 Feet-
Central and Southeast Park County-
West Jackson and West Grand Counties Above 9000 Feet-
South and East Jackson/Larimer/North and Northeast Grand/
Northwest Boulder Counties Above 9000 Feet-
147 PM MDT Wed Jun 24 2026

...RED FLAG WARNING REMAINS IN EFFECT UNTIL 6 PM MDT THIS EVENING
FOR WIND, LOW RELATIVE HUMIDITY AND ISOLATED DRY THUNDERSTORMS
FOR THE HIGH MOUNTAIN VALLEYS, PARK RANGE, SUMMIT COUNTY 
MOUNTAINS, AND THE NORTHERN FRONT RANGE MOUNTAINS...

* AFFECTED AREA...Fire Weather Zones 211, 212, 213, 214, 217 and 
  218.

* TIMING...Until 6 PM MDT this evening.

* WINDS...West 10 to 20 mph with gusts up to 30 mph. Brief gusts
  up to 40 mph possible in the vicinity of any thunderstorms.

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

* THUNDERSTORMS...Isolated dry thunderstorms possible in the 
  afternoon and evening.

* 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.

&&

$$

370 
WWUS85 KBOU 250012
RFWBOU

URGENT - FIRE WEATHER MESSAGE
National Weather Service Denver/Boulder CO
612 PM MDT Wed Jun 24 2026

COZ211>214-217-218-250115-
/O.EXP.KBOU.FW.W.0047.000000T0000Z-260625T0000Z/
Jackson County Below 9000 Feet-
South and Southeast Grand/West Central and Southwest Boulder/
Gilpin/Clear Creek/Summit/North and West Park Counties Above
9000 Feet-Grand and Summit Counties Below 9000 Feet-
Central and Southeast Park County-
West Jackson and West Grand Counties Above 9000 Feet-
South and East Jackson/Larimer/North and Northeast Grand/
Northwest Boulder Counties Above 9000 Feet-
612 PM MDT Wed Jun 24 2026

...RED FLAG WARNING HAS EXPIRED FOR WIND AND LOW RELATIVE
HUMIDITY FOR HIGH MOUNTAIN VALLEYS, PARK RANGE, SUMMIT COUNTY 
MOUNTAINS, AND THE NORTHERN FRONT RANGE MOUNTAINS...

Winds and relative humidities have improved for much of the warned
area. The Red Flag Warning has expired, but localized areas of 
critical fire weather conditions will be possible for the next 
hour or two.

$$

Area Forecast Discussion
National Weather Service Denver/Boulder CO
522 AM MDT Tue Jun 23 2026

.KEY MESSAGES...

- Widespread severe thunderstorm risk for all of the lower
  elevations starting mid-afternoon today, lasting well into the
  evening. Very large hail exceeding 2-3" in diameter will be
  possible with the strongest storms.

- Additional rounds of severe storms expected Wed and Thu for the
  lower elevations, with increasing flash flooding risk.

- Locally critical fire weather conditions in the mountains today
  and Wed. Fire danger increases considerably this weekend, as
  much hotter, drier and winder weather arrives.

&&

.DISCUSSION /Through Monday/...
Issued at 121 AM MDT Tue Jun 23 2026

Ingredients continue coming together for a significant severe
weather threat later today lasting well into the evening, so let's
dive in...

Strengthening lee cyclogenesis is evident in the surface
wind/dewpoint fields early this morning, with an axis of robust
S/SE winds across our central and southern plains. This
intensification of the surface low east of the southern Rockies
will persist through the day, sustaining 50 to 60 degree dewpoints
east of the I-25 corridor and promoting a moderately to highly
unstable environment for the lower elevations, with MLCAPE values
locally in excess of 2,000-3,000 J/Kg, coincident with the passage
of several subtle shortwaves at mid-levels which should drive
multiple rounds of convection across the region. Activity will be
slower to develop today in the wake of a morning cold front, but
convection looks to initiate by mid-afternoon as surface flow
veers towards an increasingly upslope direction and daytime mixing
gets going.

The more potent shortwave is progged to traverse NE Colorado this
evening, in tandem with an enhanced surge of moist advection which
may push dewpoints above 60F even into the Denver metro/urban
corridor. Although isolated strong to severe storms will be
possible starting mid-afternoon (30% chance), ingredients look
most aligned during the evening period as bulk shear climbs to
50-60 kts, well depicted by elongated hodographs. This environment
would be favorable for development of intense and (at least
initially) discrete supercells capable of producing very large
hail (over 2-3" in diameter). Similar to yesterday, these will
also carry a damaging wind threat and even potential for a few
isolated landspouts. In contrast to yesterday, the severe threat
will encompass the entirety of the urban corridor, with a
particular focus on areas southeast of and including the Denver
metro. With all of this in mind, an upgrade to an Enhanced (level
3/5) Risk was coordinated with SPC. Activity doesn't look to
dwindle under after midnight for areas roughly along and south of
I-70. Finally, we'll see locally critical fire weather conditions
in the high country this afternoon, returning again Wednesday.
More details on that in the Fire Weather Discussion below. We'd
also be remiss not to mention the incursion of smoke from
significant ongoing wildfires in Utah, which is expected to
sustain hazy/smoky sky conditions through the next few days.

A quite similar setup is in store for Wednesday, with an
additional weak shortwave approaching our area and a re-emergence
of a lee cyclone east of the Front Range mountains, feeding
continued unstable conditions and another threat of severe weather
for the lower elevations in the afternoon and evening. Given the
widespread convection expected today into tonight, there's an
inherent conditional aspect to Wednesday's setup, but guidance
remains bullish in the convective potential, and deep, abundant
moisture will be present. At first glance, the northeast plains
appear best positioned for a more pronounced severe weather
threat, given presumably lesser thunderstorm coverage today
relative to other areas, as well as the impressive moisture
availability (PW values exceeding 1.25" indicated in most
guidance). Until we are past today's convection however, it seems
appropriate to continue to message a broad risk of severe weather
for all of our lower elevations Wednesday. Moreover, successive
days of efficient rainmakers will increase the threat of localized
flash flooding from any convection Wednesday, and this will carry
into Thursday when thunderstorms are poised to make a return to
most areas, including our mountains (which will generally stay dry
through tomorrow).

Weaker zonal flow begins to emerge by Friday, and starts to
gradually erode our low-level moisture and severe weather
potential (emphasis on "starts to" - afternoon convection is
still favored, albeit more isolated in nature). Following several
days of cooler conditions, warmer temperatures will return to the
lower elevations. This trend accelerates over the weekend, when
hot and dry conditions will prevail for all areas. Attention will
quickly shift to our mountains, where strong southwest flow ahead
of an amplifying trough will bring widespread critical fire
weather conditions.

&&

.AVIATION /12Z TAFS through 12Z Wednesday/...
Issued at 518 AM MDT Tue Jun 23 2026

Cold front remains on track to arrive at KDEN and KBJC 1300-1330Z,
and 14Z at KAPA, bringing a shift to N winds with gusts briefly
20-25 kts. Behind the FROPA, disorganized low stratus with
variable bases 010-030 may attempt a run at Denver area terminals,
but believe the threat of CIGS is relatively low, instead favoring
mostly FEW-SCT coverage with perhaps brief BKN decks.

Expect winds to turn NE then E through the afternoon/evening,
with the caveat of TSRA-driven outflows becoming increasingly
dominant as the afternoon and evening progresses.

Isolated to scattered -TSRA will develop mid-afternoon (near 21Z)
in the vicinity of the I-25 corridor. Convection in the afternoon
looks rather sporadic and uncertain, hence the PROB30 groups. The
greater potential for widespread and significant convection
including some stronger storms will begin after 01Z, lasting
through ~06-07Z and being most pronounced for KDEN/KAPA. Temporary
vis reductions wouldn't be out of the question with the strongest
storms, but there's still a fair amount of uncertainty as to the
spatial distribution of evening convection that's limiting
forecast confidence.

Lastly, expect increased smoke aloft compared to previous days.
This will likely impact slantwise visibility at times through the
TAF period.

&&

.FIRE WEATHER...
Issued at 121 AM MDT Tue Jun 23 2026

The high valleys and mountains along/west of the Continental
Divide will see two consecutive days of widespread elevated to
locally near-critical fire weather conditions as warm, dry and
breezy conditions persist. The driest conditions are expected
today with humidity lowering to around 10% in the valleys, with
only a slight improvement Wednesday. Wind gusts 25 to 30 mph can
can be expected today, rising to up to 35 mph Wednesday.

Fire weather concerns will be buffered Thursday and Friday as
moisture increases and thunderstorms return. These will be most
widespread Thursday, when they'll bring localized wetting rains.

Significantly warmer, drier and windier weather will arrive
Saturday and continue into at least Sunday. Wind gusts in the
mountains, including both valleys and higher elevations, are
likely to exceed 40-50 mph (80% chance), sustaining highly
critical fire weather conditions both days.

&&

.BOU WATCHES/WARNINGS/ADVISORIES...
Red Flag Warning from noon today to 8 PM MDT this evening for
COZ212>214-217.

Fire Weather Watch from Wednesday morning through Wednesday
afternoon for COZ212>214.

&&

DISCUSSION...Rodriguez
AVIATION...Rodriguez
FIRE WEATHER...Rodriguez