Flash Flood Warning 26, NWS Denver/Boulder, CO

044 
WGUS75 KBOU 150012
FFSBOU

Flash Flood Statement
National Weather Service Denver CO
612 PM MDT Fri Aug 14 2026

COC039-150200-
/O.CON.KBOU.FF.W.0026.000000T0000Z-260815T0200Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Elbert CO-
612 PM MDT Fri Aug 14 2026

...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 8 PM MDT THIS EVENING
FOR NORTH CENTRAL ELBERT COUNTY...

At 612 PM MDT, Doppler radar and automated rain gauges indicated
thunderstorms producing heavy rain 11 miles northeast of Kiowa, or 34
miles west of Limon, moving northeast at 5 mph. Between 1 and 3.5
inches of rain have fallen. Additional rainfall amounts of 0.5 to 1.5
inches are possible in the warned area. Flash flooding is ongoing or
expected to begin shortly.

HAZARD...Flash flooding caused by thunderstorms.

SOURCE...Radar and automated gauges.

IMPACT...Flash flooding of small creeks and streams, gulches, roads,
         and poor drainage and low-lying areas.

Some locations that will experience flash flooding include...
  Mainly rural areas of North Central Elbert County.

This includes the following streams and drainages...
  Comanche Creek, Spring Branch, Wilson Creek, East Bijou Creek, Hay
  Gulch, West Bijou Creek and Middle Bijou Creek.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Move to higher ground now. Act quickly to protect your life.

Excessive runoff from this storm will cause flash flooding of small
creeks and streams, country roads, farmland along creeks, and other
low lying areas.

&&

LAT...LON 3924 10421 3923 10439 3930 10441 3950 10433
      3949 10413

FLASH FLOOD...RADAR AND GAUGE INDICATED

$$

09

858 
WGUS55 KBOU 150139
FFWBOU
COC039-150300-
/O.EXT.KBOU.FF.W.0026.000000T0000Z-260815T0300Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Denver CO
739 PM MDT Fri Aug 14 2026

The National Weather Service in Denver has extended the

* Flash Flood Warning for...
  North Central Elbert County in east central Colorado...

* Until 900 PM MDT.

* At 739 PM MDT, Doppler radar and automated rain gauges indicated
  thunderstorms producing heavy rain 13 miles south of Byers, or 34
  miles northwest of Limon, moving northeast at 5 mph. Between 1 and
  5 inches of rain have fallen. Additional rainfall amounts up to 0.5
  inches are possible in the warned area. Flash flooding is ongoing
  or expected to begin shortly.

  HAZARD...Flash flooding caused by thunderstorms.

  SOURCE...Radar and automated gauges.

  IMPACT...Flash flooding of small creeks and streams, gulches,
           roads, and poor drainage and low-lying areas.

* Some locations that will experience flash flooding include...
  Mainly rural areas of North Central Elbert County.

This includes the following streams and drainages...
  Comanche Creek, Spring Branch, Wilson Creek, East Bijou Creek, Hay
  Gulch, West Bijou Creek and Middle Bijou Creek.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Move to higher ground now. Act quickly to protect your life.

Excessive runoff from this storm will cause flash flooding of small
creeks and streams, country roads, farmland along creeks, and other
low lying areas.

&&

LAT...LON 3924 10421 3923 10439 3930 10441 3950 10433
      3949 10413

FLASH FLOOD...RADAR AND GAUGE INDICATED

$$

09

628 
WGUS75 KBOU 150306
FFSBOU

Flash Flood Statement
National Weather Service Denver CO
906 PM MDT Fri Aug 14 2026

COC039-150316-
/O.EXP.KBOU.FF.W.0026.000000T0000Z-260815T0300Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Elbert CO-
906 PM MDT Fri Aug 14 2026

...FLASH FLOOD WARNING HAS EXPIRED FOR NORTH CENTRAL ELBERT COUNTY...

The heavy rain has ended. Minor flooding in low-lying and poor
drainage areas will continue for the next several hours. Please
continue to heed any remaining closures.

A Flood Watch remains in effect until 1000 PM MDT for portions of
central, east central, and northeast Colorado.

&&

LAT...LON 3924 10421 3923 10439 3930 10441 3950 10433
      3949 10413

$$

09

Area Forecast Discussion
National Weather Service Denver/Boulder CO
111 PM MDT Fri Aug 14 2026

.KEY MESSAGES...

- Flash flooding and a few severe storms will be the main threats
  through this evening, as another round of storms moves east-
  northeast across the forecast area.

- Monsoon moisture lasts through the weekend, bringing scattered
  showers and thunderstorms each day with locally heavy rain and a
  severe weather threat.

- Warming and drying trend still set to begin Monday.

- Another active day possible middle of next week.

&&

.DISCUSSION /Through Friday/...
Issued at 111 PM MDT Fri Aug 14 2026

Our main concern late this afternoon and evening will be another
round of strong thunderstorms, capable of producing flash flooding
and severe weather. Nearly full sunshine over the plains has
allowed the airmass to destabilize through early this afternoon.
Low level moisture was rather impressive with dewpoints holding in
the lower to mid 60s east of the I-25 Corridor. That's pushing
MLCAPE values into the 1000-2000 J/kg range per latest SPC
analysis. While bulk shear is marginal (only around 25 kts) for
organized severe storms, we have sufficient instability to drive
large hail and damaging wet microbursts from stronger storms.
While there was some drying noted in the 700-600 mb layer on the
most recent ACARS soundings, we still expect efficient rain
producers given low level moisture and updraft intensity, and
enough to warrant a Flood Watch for flash flooding in areas that
saw recent heavy rains - see HYDROLOGY section below for more
details.

Like most convective episodes, there will probably be some weaker
convection that lingers behind the initial stronger storms that
push east across the plains. Otherwise look for gradual clearing
overnight, but patchy fog/stratus development once again with a
very moist boundary layer.

On Saturday, deep layer shear increases as flow aloft strengthens
from the west-southwest. At the same time, we'll still have a fair
amount of low/mid level moisture present, which means growing
instability and another round of afternoon and evening storms.
Some of these may be severe again due to increased shear but
a little decrease in instability as some slight drying is still
forecast.

Sunday is shaping up to be another active weather day, and
potentially even higher than Saturday as persistent low level
easterly flow and moisture advection occurs over the plains. A
failure mode would be too much moisture/low level cloudiness over
the plains, but at the same time that could mean even greater
instability and more favorable shear profiles if we get enough
heating to break the cap.

We're still on course for drier weather Monday and Tuesday as the
ridge axis retrogrades slightly. That allows for a drier west-
northwest flow aloft and warm advection. High temperatures will
likely (>70% chance) return to 90F+ by Tuesday.

Wednesday should feature higher chances of storms again (30-50%
chance), as another front is scheduled to bring slight cooling
but moistening late Tuesday into Wednesday. We don't see much
change in the overall pattern through the end of next week, which
at this point favors fairly normal Colorado weather with near
normal temperatures and isolated to scattered afternoon and
evening storms each day.

&&

.AVIATION /18Z TAFS through 18Z Saturday/...
Issued at 1108 AM MDT Fri Aug 14 2026

Similar setup to yesterday. Sct tstms will develop between 20Z and
21Z and then move across the area thru 00Z or 01Z. Naturally if a
stronger storm were to hit one of the TAF sites visibility will
drop to 1 mile with brief MVFR ceilings. By 01z will see
decreasing activity, however, still can't rule out widely sct
showers/weaker tstms thru 05z so will keep Prob30 in TAFS.

As far as winds, expect light easterly winds outside of gusty
erratic winds from tsmts which may see bring gusts from 40 to 50
mph. For late this evening, winds will become light and variable
by 05z before going light drainage by 08z.

At this time, not expecting any low clouds or fog late tonight
thru mid morning on Sat.

&&

.HYDROLOGY...
Issued at 111 PM MDT Fri Aug 14 2026

While there was some mid level drying noted in the 700-600 mb
layer, instability is growing and precipitable water (PW) content
remains near 150% of normal. Warm cloud depths are expected to
average around 4,000-5,000 feet, just a tad less than yesterday.
Mean storm motion is expected to be a little higher as well,
closer to 15-20 kts as mean cloud layer flow has strengthen
slightly. Storms will still be efficient rainers today given the
above mentioned favorable parameters, but likely just a notch down
from yesterday. That still means we could see storms producing a
quick 1-2" in 30-45 minutes, and local totals pushing 3" where
storm mergers occur (per Local Probability Matched Means). Flash
flood guidance has dropped rather considerably in areas that saw
heavy rain yesterday, and enough to warrant another Flood Watch
for flash flooding in those locations.

For Saturday and Sunday, strong storms are expected again although
PW values are expected to nudge slightly lower (~125% of normal).
Locally heavy rains can still expected due to intensity of storms,
along with local flooding impacts mainly from training storms
since storm motions will be faster (20-25 kts).

&&

.BOU WATCHES/WARNINGS/ADVISORIES...
Flood Watch until 10 PM MDT this evening for COZ036-041-042-
044>049.

&&

DISCUSSION...20
AVIATION...RPK
HYDROLOGY...20

Special Weather Statement
National Weather Service Denver CO
343 PM MDT Fri Aug 14 2026

COZ040-142215-
North Douglas County Below 6000 Feet/Denver/West Adams and
Arapahoe Counties/East Broomfield County CO-
343 PM MDT Fri Aug 14 2026

...A LINE OF STRONG THUNDERSTORMS WILL IMPACT CENTRAL DENVER...
SOUTHWESTERN ADAMS AND NORTH CENTRAL ARAPAHOE COUNTIES UNTIL 415 PM
MDT...

At 343 PM MDT, Doppler radar was tracking a line of strong
thunderstorms extending from 4 miles south of Barr Lake to over
Denver, or extending from 14 miles northeast of Denver to over
Denver, moving southeast at 10 mph.

HAZARD...Landspouts, wind gusts up to 50 mph, and pea size hail.

SOURCE...Radar indicated.

IMPACT...Minor damage to outdoor objects is possible. Gusty winds
         could knock down tree limbs and blow around unsecured
         objects.

Locations impacted include...
  Denver, northwestern Aurora and southeastern Commerce City.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3969 10496 3982 10490 3990 10482 3984 10473
      3978 10481 3969 10483
TIME...MOT...LOC 2143Z 295DEG 8KT 3989 10481 3981 10489 3970 10493

LANDSPOUT...POSSIBLE
MAX HAIL SIZE...0.25 IN
MAX WIND GUST...50 MPH

63

Preliminary Local Storm Report
National Weather Service Denver CO
354 PM MDT Fri Aug 14 2026

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

0327 PM     Tstm Wnd Gst     14 NE Kiowa             39.47N 104.26W
08/14/2026  M53 MPH          Elbert             CO   Public

            Davis WeatherLink station.

0325 PM     Tstm Wnd Gst     9 NNE Kiowa             39.46N 104.38W
08/14/2026  M64 MPH          Elbert             CO   Public

            Davis WeatherLink station.

0218 PM     Tstm Wnd Gst     2 W Elizabeth           39.36N 104.63W
08/14/2026  M62 MPH          Elbert             CO   Public

            Personal weather station.

&&

Special Weather Statement
National Weather Service Denver CO
401 PM MDT Fri Aug 14 2026

COZ043-142230-
Central and South Weld County CO-
401 PM MDT Fri Aug 14 2026

...A STRONG THUNDERSTORM WILL IMPACT SOUTHWESTERN WELD COUNTY UNTIL
430 PM MDT...

At 401 PM MDT, Doppler radar was tracking a strong thunderstorm near
Milton Reservoir, or 16 miles southeast of Greeley, moving east at 10
mph.

HAZARD...Landspouts, wind gusts up to 50 mph, and penny size hail.

SOURCE...Radar indicated.

IMPACT...Minor damage to outdoor objects is possible. Gusty winds
         could knock down tree limbs and blow around unsecured
         objects.

Locations impacted include...
  Milton Reservoir and Roggen.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

Heavy rain is occurring with this storm and may lead to flooding. Do
not drive your vehicle through flooded roadways.

&&

LAT...LON 4010 10462 4023 10474 4037 10447 4014 10430
TIME...MOT...LOC 2201Z 248DEG 9KT 4022 10458

LANDSPOUT...POSSIBLE
MAX HAIL SIZE...0.75 IN
MAX WIND GUST...50 MPH

63

Preliminary Local Storm Report
National Weather Service Denver CO
423 PM MDT Fri Aug 14 2026

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

0404 PM     Flash Flood      1 WNW Byers             39.72N 104.25W
08/14/2026                   Arapahoe           CO   Fire Dept/Rescue

            Report of a vehicle stranded in 5 feet of
            water near the intersection of Highway 36
            and Bradbury Road.

0331 PM     Landspout        2 ENE Commerce City     39.83N 104.89W
08/14/2026                   Adams              CO   Trained Spotter

            Reports including a photo of a landspout
            approximately a mile to the north of Dicks
            Sporting Goods Park. Lasted approximately 7
            minutes. Location estimated.

&&

Special Weather Statement
National Weather Service Denver CO
424 PM MDT Fri Aug 14 2026

COZ045-142300-
Central and East Adams and Arapahoe Counties CO-
424 PM MDT Fri Aug 14 2026

...A LINE OF STRONG THUNDERSTORMS WILL IMPACT ARAPAHOE AND EASTERN
ADAMS COUNTIES UNTIL 5 PM MDT...

At 424 PM MDT, Doppler radar was tracking a line of strong
thunderstorms extending from over Adena to near Deer Trail, or
extending from 18 miles south of Fort Morgan to 27 miles northwest of
Limon, moving east at 10 mph.

HAZARD...Wind gusts of 50 to 55 mph and penny size hail.

SOURCE...Radar indicated.

IMPACT...Gusty winds could knock down tree limbs and blow around
         unsecured objects. Minor damage to outdoor objects is
         possible.

Locations impacted include...
  Deer Trail, Shamrock and Cottonwood Valley.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

Heavy rain is occurring with these storms and may lead to flooding.
Do not drive your vehicle through flooded roadways.

&&

LAT...LON 3958 10408 3980 10405 4000 10403 4000 10371
      3970 10371 3957 10372
TIME...MOT...LOC 2224Z 268DEG 10KT 4001 10389 3980 10393 3959 10400

MAX HAIL SIZE...0.75 IN
MAX WIND GUST...50 TO 55 MPH

63

Special Weather Statement
National Weather Service Denver CO
432 PM MDT Fri Aug 14 2026

COZ046-142300-
North and Northeast Elbert County Below 6000 Feet/North Lincoln
County CO-
432 PM MDT Fri Aug 14 2026

...A STRONG THUNDERSTORM WILL IMPACT NORTHEASTERN ELBERT AND
NORTHWESTERN LINCOLN COUNTIES UNTIL 5 PM MDT...

At 432 PM MDT, Doppler radar was tracking a strong thunderstorm 5
miles east of Agate, or 18 miles northwest of Limon, moving east at
10 mph.

HAZARD...Landspouts, wind gusts of 50 to 55 mph, and half inch size
         hail.

SOURCE...Radar indicated.

IMPACT...Minor damage to outdoor objects is possible. Gusty winds
         could knock down tree limbs and blow around unsecured
         objects.

Locations impacted include...
  Mainly rural areas of Northeastern Elbert and Northwestern Lincoln
  Counties.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3937 10394 3957 10394 3957 10360 3936 10362
TIME...MOT...LOC 2231Z 268DEG 10KT 3949 10386

LANDSPOUT...POSSIBLE
MAX HAIL SIZE...0.50 IN
MAX WIND GUST...50 TO 55 MPH

63