Flash Flood Warning 9, NWS Denver/Boulder, CO

589 
WGUS75 KBOU 210355
FFSBOU

Flash Flood Statement
National Weather Service Denver CO
955 PM MDT Sun Jul 20 2025

COC073-210545-
/O.CON.KBOU.FF.W.0009.000000T0000Z-250721T0545Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Lincoln CO-
955 PM MDT Sun Jul 20 2025

...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 1145 PM MDT THIS 
EVENING FOR EAST CENTRAL LINCOLN COUNTY...

At 955 PM MDT, Doppler radar indicated thunderstorms producing heavy 
rain had moved out of the warned area. Between 1.5 and 3.5 inches of 
rain had fallen. Flooding impacts will continue, but no additional 
significant 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...
  Mainly rural areas of East Central Lincoln County, just east, 
  southeast, and south of Hugo.

This includes the following streams and drainages...
  Big Sandy Creek, Coon Creek and Sevenmile Creek.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Turn around, don't drown when encountering flooded roads. Most flood 
deaths occur in vehicles.

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


&&

LAT...LON 3916 10344 3915 10345 3913 10345 3911 10351
      3907 10356 3901 10336 3897 10336 3899 10332
      3916 10328 3917 10330

FLASH FLOOD...RADAR INDICATED

$$

Barjenbruch

970 
WGUS75 KBOU 210548
FFSBOU

Flash Flood Statement
National Weather Service Denver CO
1148 PM MDT Sun Jul 20 2025

COC073-210558-
/O.EXP.KBOU.FF.W.0009.000000T0000Z-250721T0545Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Lincoln CO-
1148 PM MDT Sun Jul 20 2025

...FLASH FLOOD WARNING HAS EXPIRED FOR EAST CENTRAL LINCOLN COUNTY...

Flood waters have receded. Flooding is no longer expected to pose a 
threat. If you are traveling in areas just east or southeast of Hugo 
overnight, be alert to possible standing water or erosion on rural 
roads.

&&

LAT...LON 3916 10344 3915 10345 3913 10345 3911 10351
      3907 10356 3901 10336 3897 10336 3899 10332
      3916 10328 3917 10330

$$

Gimmestad

Area Forecast Discussion
National Weather Service Denver/Boulder CO
706 PM MDT Sun Jul 20 2025

.KEY MESSAGES...

- Increased moisture and slight cooling expected by midweek.

- Warmer again for next weekend.

&&

.DISCUSSION /Through Sunday/...
Issued at 205 PM MDT Sun Jul 20 2025

Water vapor imagery shows drier conditions in place across the
forecast area this morning compared to Saturday, and the upper-level
high remains centered over OK. A ribbon of higher moisture
associated with a remnant MCC over southern New Mexico is visible
wrapping around the southwesterly flow aloft and approaching SW
Colorado. Some of the hi-res models show this moisture making it
into western CO, bringing late night/early morning shower potential
to our northern mountains. With a trough entering the Pacific
Northwest, there is a chance this moisture gets pushed slightly
more southward, but have increase PoPs slightly over the northern
mountains to account or this potential.

There are no significant changes for today's forecast as the
drier conditions will result in less shower and storm coverage
this afternoon and evening, with the plains largely remaining dry.
There could be some gusty outflows from passing virga showers,
but generally the moisture will be over the central and southern
mountains and foothills, as well as the Palmer Divide and adjacent
plains. Hi-res guidance show a dryline in place along the eastern
edge of the forecast area that could help initiate storms later
today, with a few stronger ones possible for Lincoln and southern
Washington Counties into the evening.

The synoptic pattern will remain largely dominated by the broad
upper-level ridge over the south central US through the forecast
period, with a few shortwave passages over the northern tier of the
US. Ensembles still show a steady increase in moisture for the
first half of the week, with Wednesday seeing the peak as PWAT
values reach 130-160% of normal. Scattered afternoon showers and
storms are expected Monday and Tuesday with slightly higher
chances for some moisture making it onto the lower elevations.
Slightly cooler 700 mb temperatures are expected on Wednesday and
Thursday associated with a cool front that will give the plains a
brief break from afternoon highs in the 90s. With the increased
moisture and light winds under the ridge, there will be increased
potential for localized flooding under some heavier rainfall.
A warmup still looks to start on Friday making for another hot
weekend, as ensembles continue to show temps nearing triple
digits across the lower elevations.

&&

.AVIATION /00Z TAFS through 00Z Tuesday/...
Issued at 702 PM MDT Sun Jul 20 2025

The weak convection that was around earlier continues to push
boundaries towards and across the big airport early this evening.
Another one just brought increased south-southwesties to DIA.
Models do show drainage at DIA overnight. There will not be any
ceiling issues this evening or overnight.

&&

.BOU WATCHES/WARNINGS/ADVISORIES...
None.

&&

DISCUSSION...Bonner
AVIATION.....rjk

Hazardous Weather Outlook
National Weather Service Denver/Boulder CO
808 AM MDT Sun Jul 20 2025

COZ030>051-211415-
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-
808 AM MDT Sun Jul 20 2025

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

.DAY ONE...Today and Tonight

Warmer and drier conditions are expected today with less
shower/storm coverage. Isolated to scattered showers and storms
are still expected, mainly along the Front Range mountains,
foothills, and Palmer Divide. A few stronger storms may develop
where greater instability and shear is expected, along our eastern
most counties.

.DAYS TWO THROUGH SEVEN...Monday through Saturday

We will see a steady increase in moisture starting Monday, with
increasing afternoon shower and storm coverage each day across
the forecast area. Temperatures will remain in the 90s across the
plains through the first half of the week, with a very slight cool
down by mid-week. Moisture will peak Wednesday, as PWAT values
increase to between 120% to 160% of normal, which would support
heavier rainfall chances. Another warming trend starts Friday,
with temperatures in the upper 90s along the urban corridor and
lower elevations by Saturday.

.SPOTTER INFORMATION STATEMENT...

Spotter activation will not be needed today or tonight.

Special Weather Statement
National Weather Service Denver CO
621 PM MDT Sun Jul 20 2025

COZ046-210100-
North and Northeast Elbert County Below 6000 Feet/North Lincoln
County CO-
621 PM MDT Sun Jul 20 2025

...A STRONG THUNDERSTORM WILL IMPACT NORTHEASTERN LINCOLN COUNTY
UNTIL 7 PM MDT...

At 621 PM MDT, Doppler radar was tracking a strong thunderstorm near
Arriba, or 20 miles east of Limon, moving northeast at 10 mph.

HAZARD...Wind gusts up to 50 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...
  Arriba.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

If outdoors, consider seeking shelter inside a building.

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

&&

LAT...LON 3919 10332 3935 10345 3948 10325 3938 10316
      3930 10316
TIME...MOT...LOC 0021Z 225DEG 7KT 3930 10332

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

RPK

Special Weather Statement
National Weather Service Denver CO
644 PM MDT Sun Jul 20 2025

COZ036-039-040-210130-
North Douglas County Below 6000 Feet/Denver/West Adams and
Arapahoe Counties/East Broomfield County CO-Jefferson and West
Douglas Counties Above 6000 Feet/Gilpin/Clear Creek/Northeast
Park Counties Below 9000 Feet CO-Boulder And Jefferson Counties
Below 6000 Feet/West Broomfield County CO-
644 PM MDT Sun Jul 20 2025

...A SHOWER WILL IMPACT SOUTHWESTERN DENVER...CENTRAL JEFFERSON...
SOUTHWESTERN ARAPAHOE AND NORTH CENTRAL DOUGLAS COUNTIES UNTIL 730
PM MDT...

At 644 PM MDT, Doppler radar was tracking a shower near Tiny Town,
or 18 miles southwest of Denver, moving northeast at 10 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...
  Southwestern Denver, Lakewood, southwestern Centennial, Highlands
  Ranch, Littleton, Englewood, southern Golden, Greenwood Village,
  Evergreen, Sheridan, Morrison, Tiny Town, Red Rocks Park,
  Chatfield Reservoir, Indian Hills, Idledale, Aspen Park,
  Kittredge, Edgewater and Ken Caryl.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

If outdoors, consider seeking shelter inside a building.

If on a lake, get out of the water and secure loose items. Boaters
can expect strong gusty winds and locally higher waves. Boaters
should seek safe harbor immediately.

&&

LAT...LON 3946 10525 3966 10534 3975 10505 3954 10494
TIME...MOT...LOC 0043Z 239DEG 9KT 3955 10519

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

RPK

Special Weather Statement
National Weather Service Denver CO
704 PM MDT Sun Jul 20 2025

COZ046-047-210145-
North and Northeast Elbert County Below 6000 Feet/North Lincoln
County CO-Southeast Elbert County Below 6000 Feet/South Lincoln
County CO-
704 PM MDT Sun Jul 20 2025

...A LINE OF STRONG THUNDERSTORMS WILL IMPACT EAST CENTRAL ELBERT
AND EAST CENTRAL LINCOLN COUNTIES UNTIL 745 PM MDT...

At 704 PM MDT, Doppler radar was tracking a line of strong
thunderstorms extending from 7 miles south of Limon to 6 miles
southeast of Arriba, or extending from 7 miles south of Limon to 27
miles east of Limon, moving north at 5 mph.

HAZARD...Wind gusts up to 50 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...
  Limon, Hugo, Arriba and Genoa.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

If outdoors, consider seeking shelter inside a building.

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

&&

LAT...LON 3910 10373 3930 10369 3929 10339 3933 10316
      3911 10316 3907 10344 3908 10374
TIME...MOT...LOC 0104Z 187DEG 4KT 3917 10370 3916 10343 3922 10320

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

RPK

Special Weather Statement
National Weather Service Denver CO
707 PM MDT Sun Jul 20 2025

COZ047-210130-
Southeast Elbert County Below 6000 Feet/South Lincoln County CO-
707 PM MDT Sun Jul 20 2025

...A STRONG THUNDERSTORM WILL IMPACT SOUTHWESTERN LINCOLN COUNTY
UNTIL 730 PM MDT...

At 707 PM MDT, Doppler radar was tracking a strong thunderstorm 20
miles southwest of Forder, or 53 miles south of Limon, moving
northeast at 10 mph.

HAZARD...Wind gusts up to 50 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...
  Mainly rural areas of Southwestern Lincoln County.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

If outdoors, consider seeking shelter inside a building.

&&

LAT...LON 3865 10405 3866 10390 3852 10389 3852 10405
TIME...MOT...LOC 0107Z 238DEG 7KT 3855 10403

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

RPK

Special Weather Statement
National Weather Service Denver CO
736 PM MDT Sun Jul 20 2025

COZ047-210200-
Southeast Elbert County Below 6000 Feet/South Lincoln County CO-
736 PM MDT Sun Jul 20 2025

...A STRONG THUNDERSTORM WILL IMPACT SOUTHWESTERN LINCOLN COUNTY
UNTIL 8 PM MDT...

At 736 PM MDT, Doppler radar was tracking a strong thunderstorm 6
miles west of Forder, or 43 miles south of Limon, moving northeast
at 10 mph.

HAZARD...Landspouts, wind gusts of 50 to 55 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...
  Forder.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

If a tornado is spotted seek shelter inside a sturdy building.

&&

LAT...LON 3855 10386 3872 10391 3876 10373 3857 10366
TIME...MOT...LOC 0135Z 231DEG 8KT 3865 10381

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

RPK

Special Weather Statement
National Weather Service Denver CO
748 PM MDT Sun Jul 20 2025

COZ046-047-210215-
North and Northeast Elbert County Below 6000 Feet/North Lincoln
County CO-Southeast Elbert County Below 6000 Feet/South Lincoln
County CO-
748 PM MDT Sun Jul 20 2025

...A LINE OF STRONG THUNDERSTORMS WILL IMPACT EAST CENTRAL ELBERT
AND EAST CENTRAL LINCOLN COUNTIES UNTIL 815 PM MDT...

At 748 PM MDT, Doppler radar was tracking a line of strong
thunderstorms extending from 9 miles southeast of Arriba to 14 miles
south of Limon, or extending from 29 miles east of Limon to 14 miles
south of Limon, moving southeast at 5 mph.

HAZARD...Wind gusts up to 50 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...
  Hugo.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

If outdoors, consider seeking shelter inside a building.

Torrential rainfall is also occurring with these storms and may lead
to flash flooding. Do not drive your vehicle through flooded
roadways.

&&

LAT...LON 3919 10374 3920 10342 3930 10316 3912 10316
      3905 10334 3902 10373
TIME...MOT...LOC 0147Z 335DEG 5KT 3919 10316 3909 10337 3907 10370

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

RPK