Flash Flood Warning 7, NWS Denver/Boulder, CO

071 
WGUS75 KBOU 040313
FFSBOU

Flash Flood Statement
National Weather Service Denver CO
913 PM MDT Fri Jul 3 2026

COC075-121-040530-
/O.CON.KBOU.FF.W.0007.000000T0000Z-260704T0530Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Logan CO-Washington CO-
913 PM MDT Fri Jul 3 2026

...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 1130 PM MDT THIS
EVENING FOR SOUTHEASTERN LOGAN AND NORTH CENTRAL WASHINGTON
COUNTIES...

At 913 PM MDT, Doppler radar indicated thunderstorms have produced
heavy rain across the warned area. Between 2.5 and 3.5 inches of rain
have fallen. Flooding impacts will continue, but no additional
rainfall is expected. Flash flooding is ongoing or expected to begin
shortly.

HAZARD...Flash flooding caused by thunderstorms.

SOURCE...Radar indicated.

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...
  St Petersburg.

This includes the following streams and drainages...
  North Fork Frenchman Creek, Rock Creek, Patent Creek and Sandy
  Creek.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

Be especially cautious at night when it is harder to recognize the
dangers of flooding.

&&

LAT...LON 4046 10326 4050 10321 4051 10315 4057 10305
      4060 10293 4063 10288 4065 10272 4064 10268
      4062 10267 4057 10268 4052 10274 4041 10296
      4040 10296 4040 10299 4039 10299 4039 10302
      4037 10305 4037 10316 4039 10323 4042 10326

FLASH FLOOD...RADAR INDICATED

$$

63

144 
WGUS55 KBOU 040515
FFWBOU
COC075-121-040730-
/O.EXT.KBOU.FF.W.0007.000000T0000Z-260704T0730Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Denver CO
1115 PM MDT Fri Jul 3 2026

The National Weather Service in Denver has extended the

* Flash Flood Warning for...
  Southeastern Logan County in northeastern Colorado...
  North Central Washington County in northeastern Colorado...

* Until 130 AM MDT.

* At 1115 PM MDT, local law enforcement reported Flash flooding was
  occurring along Highway 61 between County Roads 4 and 8 in Logan
  county. Between 2.5 and 3.5 inches of rain fell earlier. Flooding
  impacts will continue, but no additional rainfall is expected.
  Flash flooding is already occurring.

  HAZARD...Flash flooding caused by thunderstorms.

  SOURCE...Law enforcement reported.

  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...
  St Petersburg.

This includes the following streams and drainages...
  North Fork Frenchman Creek, Rock Creek, Patent Creek and Sandy
  Creek.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

Be especially cautious at night when it is harder to recognize the
dangers of flooding.

&&

LAT...LON 4046 10326 4050 10321 4051 10315 4057 10305
      4060 10293 4063 10288 4065 10272 4064 10268
      4062 10267 4057 10268 4052 10274 4041 10296
      4040 10296 4040 10299 4039 10299 4039 10302
      4037 10305 4037 10316 4039 10323 4042 10326

FLASH FLOOD...OBSERVED

$$

63

142 
WGUS75 KBOU 040618
FFSBOU

Flash Flood Statement
National Weather Service Denver CO
1218 AM MDT Sat Jul 4 2026

COC075-121-040730-
/O.CON.KBOU.FF.W.0007.000000T0000Z-260704T0730Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Logan CO-Washington CO-
1218 AM MDT Sat Jul 4 2026

...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 130 AM MDT EARLY THIS
MORNING FOR SOUTHEASTERN LOGAN AND NORTH CENTRAL WASHINGTON
COUNTIES...

At 1218 AM MDT, local law enforcement reported thunderstorms
producing heavy rain in Flash flooding was reported along Highway 61
between County Roads 4 and 8 in Logan county. Between 2.5 and 3.5
inches of rain have fallen. Flooding impacts will continue, but no
additional rainfall is expected. Flash flooding is already occurring.

HAZARD...Flash flooding caused by thunderstorms.

SOURCE...Law enforcement reported.

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...
  St Petersburg.

This includes the following streams and drainages...
  Rock Creek, South Platte River, North Fork Frenchman Creek, Sandy
  Creek and Patent Creek.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

Be especially cautious at night when it is harder to recognize the
dangers of flooding.

&&

LAT...LON 4046 10326 4050 10321 4051 10315 4057 10305
      4060 10293 4063 10288 4065 10272 4064 10268
      4062 10267 4057 10268 4052 10274 4041 10296
      4040 10296 4040 10299 4039 10299 4039 10302
      4037 10305 4037 10316 4039 10323 4042 10326

FLASH FLOOD...OBSERVED

$$

63

070 
WGUS75 KBOU 040720
FFSBOU

Flash Flood Statement
National Weather Service Denver CO
120 AM MDT Sat Jul 4 2026

COC075-121-040730-
/O.EXP.KBOU.FF.W.0007.000000T0000Z-260704T0730Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Logan CO-Washington CO-
120 AM MDT Sat Jul 4 2026

...FLASH FLOOD WARNING WILL EXPIRE AT 130 AM MDT EARLY THIS MORNING
FOR SOUTHEASTERN LOGAN AND NORTH CENTRAL WASHINGTON COUNTIES...

Flood waters have receded. Flooding is no longer expected to pose a
threat. Please continue to heed any remaining closures.

&&

LAT...LON 4046 10326 4050 10321 4051 10315 4057 10305
      4060 10293 4063 10288 4065 10272 4064 10268
      4062 10267 4057 10268 4052 10274 4041 10296
      4040 10296 4040 10299 4039 10299 4039 10302
      4037 10305 4037 10316 4039 10323 4042 10326

$$

63

Area Forecast Discussion
National Weather Service Denver/Boulder CO
627 PM MDT Fri Jul 3 2026

.KEY MESSAGES...

- Last day of critical fire weather conditions as winds gradually
  relax. However, still plenty of hot, dry weather ahead.

- Another round of nocturnal (and potentially severe) convection
  possible tonight.

- Scattered strong to severe storms expected for the afternoon and
  early evening of the 4th.

- A few storms expected each day of the coming week, with the
  highest probabilities shaping up for Tuesday and Wednesday from
  the Front Range eastward.

&&

.DISCUSSION /Through Friday/...
Issued at 233 PM MDT Fri Jul 3 2026

Another day (and night) of uncertainty with regard to convective
development. CAMs have not been doing a great job of assessing
potential and duration of nocturnal convection, and amount of low
level moisture surging westward from MCSs in the Central/High
Plains the last couple of nights.

As of early this afternoon, weak convection has been developing
over the northern mountains and foothills. As that moves east onto
the plains, a couple storms are expected to tap into the higher
MLCAPE near 1500-2000 J/kg and become severe late this afternoon
into early evening. Where more uncertainty enters the forecast is
overnight, and that's when a couple pieces of the puzzle attempt
to come together and produce another round of strong to
potentially severe storms. That potential would extend farther
west toward the I-25 Corridor. That would be fueled by outflow
from the initial round of storms over the northern tier of
Colorado, and potentially another outflow from a more organized
storm complex (MCS) over Nebraska. That second surge would likely
arrive later in the evening, and that could spark storms that
linger well past midnight. At the same time, we'll also have some
upper level support from the left exit region of an upper level
speed max. While weakly capped, the lift from any upslope would
likely be enough to break through and initiate more storms. MLCAPE
by that time would be a little lower (800-1600 J/kg), but still
enough for a couple strong to severe storms that linger well past
midnight.

Saturday, the 4th of July, is still shaping up to serve up some
of nature's fireworks. It will likely be a more active
thunderstorm day with higher MLCAPE across the Front Range and
adjacent plains. Some patchy morning stratus is possible, but not
enough to significantly impact warming and cap erosion by early
to mid afternoon. MLCAPE is forecast to increase to 1500-2000 J/kg
along/east of the I-25 Corridor, but at the same time there is
plenty of uncertainty with exactly how far west the greatest
moisture and instability can hold (highly dependent on strength of
surges tonight). Most likely, deeper instability holds roughly
east of I-25, with lesser certainty west of I-25. We think storm
initiation will be in/very close to the Front Range Mountains and
Foothills by early afternoon, with eastward propagation across
the plains from mid afternoon through early evening. 0-6km bulk
shear is forecast to increase to 30-35 kts, enough for supercell
development. Initial isolated severe storms are expected to have a
large hail threat, and those storms may then attempt to organize
into a linear structure onto the plains with a greater high wind
threat (in addition to the hail). A failure mode would be if the
airmass remains too capped due to weak synoptic subsidence seen
arriving in the afternoon. Anyone planning outdoor celebrations or
activities tomorrow should remain weather aware and be prepared
to take shelter or move off open waters before storms arrive.
Finally, with the above mentioned arrival of subsidence, we do
think the vast majority of storms should clear the forecast area
before dark and any fireworks shows.

By Sunday and Monday, upper level ridging builds across Colorado.
While this will tend to stabilize things a bit, it will still be
hot and residual moisture means a continued chance of storms each
afternoon and evening. Typically this pattern has the most
convection occurring over Park County and the Front Range
Mountains into the Palmer Divide area, with lower probabilities to
the north and east. High temperatures will likely reach the 90-95
degree range over the plains, after just slight cooling (near
normal temps) for Saturday.

For Tuesday and Wednesday, the upper level ridge is forecast to
flatten with weak zonal flow developing across the forecast area.
As low level moisture remains locked in east of the Rockies,
instability builds slightly and shear improves so scattered
thunderstorms are expected both days with potential for a couple
severe storms. Temperatures will remain a few degrees above
normal.

Drying is expected for the latter portion of the weak as there is
growing confidence we remain under zonal flow aloft. Some lee
troughing is also forecast, which means the greatest chance of
storms will likely shift to the eastern plains while drier air and
a return of elevated fire weather conditions (with increasing
breezes) is expected over the high country.

&&

.AVIATION /00Z TAFS through 00Z Sunday/...
Issued at 625 PM MDT Fri Jul 3 2026

Current radar imagery shows showers and thunderstorms developing
east of the Denver metro area, over the northern Colorado plains,
and off the foothills near the I-25 corridor. One of these
thunderstorms just tracked over KDEN, and has exited the vicinity
to the northeast. The chance for a thunderstorm near the terminals
will increase between 02Z and 05Z, as outflow boundaries from the
storm activity to the southeast and another boundary moving in
from the north collide and fire up additional convection.

A similar setup will be in place tomorrow with winds starting out SW
or variable before becoming ENE-E at KDEN and S-SE at KAPA. Winds at
KBJC will likely turn to the NE and remain light, as has occurred
over the last few afternoons with a cyclone near KDEN and KAPA.
Another round of thunderstorms is expected tomorrow afternoon,
with the peak of activity occurring slightly earlier than today,
between 19Z and 01Z. Gusty outflows up to 35-40KT will be possible
with shower or thunderstorm activity tomorrow.

Smoke aloft will continue to cause slant-range visibility concerns,
especially near sunrise and sunset when the sun angle is low.
Shower activity may provide some relief from the hazy skies but
smoke aloft will continue until a major pattern change arrives, or
until fire activity decreases.

&&

.BOU WATCHES/WARNINGS/ADVISORIES...
Red Flag Warning until 7 PM MDT this evening for COZ214.

&&

DISCUSSION...20
AVIATION...AA

Special Weather Statement
National Weather Service Denver CO
550 PM MDT Fri Jul 3 2026

COZ045-046-049-040030-
North and Northeast Elbert County Below 6000 Feet/North Lincoln
County CO-Washington County CO-Central and East Adams and
Arapahoe Counties CO-
550 PM MDT Fri Jul 3 2026

...A STRONG THUNDERSTORM WILL IMPACT SOUTHWESTERN WASHINGTON...
ARAPAHOE...NORTHEASTERN ELBERT AND NORTH CENTRAL LINCOLN COUNTIES
UNTIL 630 PM MDT...

At 550 PM MDT, Doppler radar was tracking a strong thunderstorm 7
miles north of Agate, or 23 miles northwest of Limon, moving east at
20 mph.

HAZARD...Wind gusts up to 40 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...
  Cottonwood Valley.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3957 10398 3962 10399 3976 10364 3949 10357
      3949 10397
TIME...MOT...LOC 2349Z 260DEG 17KT 3956 10390

MAX HAIL SIZE...0.75 IN
MAX WIND GUST...40 MPH

BRQ

Special Weather Statement
National Weather Service Denver CO
552 PM MDT Fri Jul 3 2026

COZ042-040030-
Northeast Weld County CO-
552 PM MDT Fri Jul 3 2026

...A STRONG THUNDERSTORM WILL IMPACT NORTHEASTERN WELD COUNTY UNTIL
630 PM MDT...

At 552 PM MDT, Doppler radar was tracking a strong thunderstorm 6
miles northeast of Briggsdale, or 33 miles northeast of Greeley,
moving east at 20 mph.

HAZARD...Wind gusts up to 40 mph and half inch 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...
  Keota, Pawnee Buttes and Buckingham.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4061 10428 4076 10430 4085 10393 4061 10388
TIME...MOT...LOC 2352Z 260DEG 17KT 4069 10424

MAX HAIL SIZE...0.50 IN
MAX WIND GUST...40 MPH

BRQ

Special Weather Statement
National Weather Service Denver CO
556 PM MDT Fri Jul 3 2026

COZ040-043-045-040045-
North Douglas County Below 6000 Feet/Denver/West Adams and
Arapahoe Counties/East Broomfield County CO-Central and South
Weld County CO-Central and East Adams and Arapahoe Counties CO-
556 PM MDT Fri Jul 3 2026

...A STRONG THUNDERSTORM WILL IMPACT NORTHEASTERN DENVER...SOUTH
CENTRAL WELD AND CENTRAL ADAMS COUNTIES UNTIL 645 PM MDT...

At 556 PM MDT, Doppler radar was tracking a strong thunderstorm 11
miles north of Manila Village, or 28 miles northeast of Denver,
moving northeast at 25 mph.

HAZARD...Wind gusts up to 40 mph and half inch 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...
  Prospect Valley.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4000 10452 4020 10430 4003 10415 4000 10415
      4000 10412 3999 10411 3979 10445 3992 10461
TIME...MOT...LOC 2356Z 229DEG 21KT 3991 10448

MAX HAIL SIZE...0.50 IN
MAX WIND GUST...40 MPH

BRQ

Preliminary Local Storm Report
National Weather Service Denver CO
728 PM MDT Fri Jul 3 2026

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

0620 PM     Hail             3 NW Buckingham         40.64N 104.02W
07/03/2026  M1.25 Inch       Weld               CO   Public

&&

BR

Preliminary Local Storm Report
National Weather Service Denver CO
820 PM MDT Fri Jul 3 2026

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

0805 PM     Hail             7 SSW Reiradon Hill     40.48N 103.08W
07/03/2026  E1.25 Inch       Logan              CO   Trained Spotter

            Time estimated from radar.

&&

AA

Preliminary Local Storm Report
National Weather Service Denver CO
835 PM MDT Fri Jul 3 2026

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

0746 PM     Hail             2 WNW Union             40.36N 103.54W
07/03/2026  E1.00 Inch       Morgan             CO   Public

            Time estimated from radar.

&&

AA