Isolated to scattered storms occurred across the eastern mountains and plains, with the highest coverage noted over the far southeast plains. A diminishing trend with this development occurred on this day, however, a few storms did produce heavy rainfall with flash flooding.
Every event with a place to put it. Tap one for its entry below.
Deaths and injuries are direct and indirect together, as the offices filed them. Damage is property and crops in the dollars of the year, not adjusted for inflation, and only where an office estimated it.
The episode as NWS PUB wrote it up.
Isolated to scattered storms occurred across the eastern mountains and plains, with the highest coverage noted over the far southeast plains. A diminishing trend with this development occurred on this day, however, a few storms did produce heavy rainfall with flash flooding.
The local office's own words before the first event, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.
NWS Pueblo, CO wrote its last area forecast discussion before the first event at Aug 4, 2:09 PM MST, 41 minutes earlier.
Area Forecast Discussion National Weather Service Pueblo CO 309 PM MDT Wed Aug 4 2021 .SHORT TERM...(This evening through Thursday) Issued at 246 PM MDT Wed Aug 4 2021 ...A Drying Trend across the Region... Current water vapor imagery across the region tells the story, with a weak upper trough digging across the eastern plains, as a much drier and more subsident airmass continues to move across western and into central Colorado on the back side of the upper ridge across the Great Basin. SPC analysis is indicating PWATS running from 0.4 inches across western Colorado to 1.3 inches across the eastern plains, along with MLCapes of 500-1000 j/kg across the I-25 Corridor through the plains at this time. Regional radars are indicating isolated to scattered storms across the eastern mts and and plains, with the best coverage across the far southeast plains at this time. Tonight and Tomorrow...The weak upper trough continues to lift out across the southeast plains this evening with much drier air progged to move into the region within modest north to northwest flow aloft, as the Great Basin upper ridge starts to flatten across the Rockies. With that said, expecting the isolated to scattered storms across the plains to diminish and end through the late afternoon and evening with the loss of solar heating, with clearing skies there after. With the weaker northerly steering flow aloft and abundant available moisture across the plains, main storm threats will continue to be locally heavy rain and the potential for flash flooding through the rest of the afternoon. Warmer and drier air continues to work into the region for tomorrow, leading to temperatures warming back to near seasonal levels in the 80s to lower 90s across the plains, and mainly in the 60s and 70s across the higher terrain. Sunny skies across the region in the morning, will give way to a few clouds and high based showers across the higher terrain through the afternoon, with the best coverage of storms expected across the southwest mountains. .LONG TERM...(Thursday night through Wednesday) Issued at 246 PM MDT Wed Aug 4 2021 Overall there is good agreement through the extended period, with a return to hot and drier conditions. Temperatures will once again push 100 across the Plains, with little if any precipitation expected beyond Friday. Thursday night...weak energy embedded in southwesterly flow will lead to isolated showers and thunderstorms, mainly over the San Juan Mountains Thursday evening. Models have this activity dissipating with sunset, with dry conditions through the remainder of the overnight period. Friday...an upper trough is forecast to pass from the northern Rockies, into the northern Plains. The base of this upper trough will move across central Colorado. This will help in developing isolated to scattered showers and thunderstorms, initially over the Mountains. These storms will shift eastward given the westerly flow aloft and impact the Palmer Divide region by late afternoon and evening. Thunderstorms will dissipate during the evening hours, with dry conditions expected overnight. If a storm should happen to impact a burn scar, mainly thinking Decker and Hayden Pass at this time, flash flooding would be possible. Saturday through Monday...generally flat, westerly flow will prevail over the weekend into early next week across Colorado. Lack of energy moving across the region along with increasingly dry air across the area should lead to several dry days. Afternoon temperatures will warm into the 90s, with the Plains pushing 100 degrees for during this period. Tuesday and Wednesday...a weak cold front is forecast to arrive early Tuesday, along with upper level energy moving southeast out of the Northern Rockies and into the Central Plains. This may produce isolated to scattered showers and thunderstorms across southern Colorado. Areas along the Continental Divide, east into the Palmer Divide would be the favored areas to see precipitation. By Wednesday, energy across New Mexico could produce more widespread showers and thunderstorms over the San Juan range and southern Sangre de Cristo Mountains. Temperatures will remain hot into the middle of next week, with 90s across the Plains. Mozley && .AVIATION...(For the 00Z TAFS through 00Z Thursday evening) Issued at 246 PM MDT Wed Aug 4 2021 Much drier air will work into the region through the day tomorrow within weak north to northwest flow aloft. With that said, we are expecting VFR conditions and generally light, diurnal and thermally driven wind regimes at COS, PUB and ALS over the next 24 hours. && .PUB WATCHES/WARNINGS/ADVISORIES... NONE. && SHORT TERM...MW LONG TERM...MOZLEY AVIATION...MW
Hazardous Weather Outlook National Weather Service Pueblo CO 1030 AM MDT Wed Aug 4 2021 COZ058>089-093>099-051630- Western Mosquito Range/East Lake County Above 11000 Feet- Leadville Vicinity/Lake County Below 11000 Feet- Eastern Sawatch Mountains Above 11000 Feet- Western Chaffee County Between 9000 and 11000 Feet- Central Chaffee County Below 9000 Feet- Western Mosquito Range/East Chaffee County Above 9000 Feet- Saguache County West of Continental Divide Below 10000 Feet- Saguache County East of Continental Divide Below 10000 Feet- La Garita Mountains Above 10000 Feet- Upper Rio Grande Valley/Eastern San Juan Mountains Below 10000 Feet-Eastern San Juan Mountains Above 10000 Feet- Del Norte Vicinity/Northern San Luis Valley Below 8500 Feet- Alamosa Vicinity/Central San Luis Valley Below 8500 Feet- Southern San Luis Valley- Northern Sangre de Cristo Mountains Between 8500 And 11000 Feet- Northern Sangre de Cristo Mountains Above 11000 Feet- Southern Sangre de Cristo Mountains Between 7500 and 11000 Feet- Southern Sangre de Cristo Mountains Above 11000 Feet- Northwestern Fremont County Above 8500 Feet- Western/Central Fremont County Below 8500 Feet- Wet Mountain Valley Below 8500 Feet- Wet Mountains between 6300 and 10000 Feet- Wet Mountains Above 10000 Feet- Teller County/Rampart Range Above 7500 Feet/Pikes Peak Between 7500 And 11000 Feet-Pikes Peak Above 11000 Feet- Canon City Vicinity/Eastern Fremont County- Northern El Paso County/Monument Ridge/Rampart Range Below 7500 Feet- Colorado Springs Vicinity/Southern El Paso County/Rampart Range Below 7400 Feet-Pueblo Vicinity/Pueblo County Below 6300 Feet- Walsenburg Vicinity/Upper Huerfano River Basin Below 7500 Feet- Trinidad Vicinity/Western Las Animas County Below 7500 Feet- Crowley County-La Junta Vicinity/Otero County- Eastern Las Animas County-Western Kiowa County- Eastern Kiowa County-Las Animas Vicinity/Bent County- Lamar Vicinity/Prowers County-Springfield Vicinity/Baca County- 1030 AM MDT Wed Aug 4 2021 This hazardous weather outlook is for portions of central...east central...south central and southeast Colorado. .DAY ONE...Today and Tonight Scattered showers and thunderstorms can be expected today, with the best coverage of storms over the southeast mountains and plains. Storms will continue to be slow moving, leading to the potential for locally heavy rainfall and flash flooding, mainly over the Spring Burn Scar and other areas that have seen abundant precipitation over the past few days. A few of the stronger storms could also produce small hail. Storms will quickly diminish and end through the early evening. .DAYS TWO THROUGH SEVEN...Thursday through Tuesday No hazardous weather is expected at this time. .SPOTTER INFORMATION STATEMENT... Weather conditions that meet reporting criteria for spotters will be possible over the eastern mountains and plains this afternoon. 23/23
Special Weather Statement
National Weather Service Pueblo CO
120 PM MDT Wed Aug 4 2021
COZ094-097-099-042000-
Springfield Vicinity/Baca County CO-
Las Animas Vicinity/Bent County CO-Eastern Las Animas County CO-
120 PM MDT Wed Aug 4 2021
At 118 PM MDT, Doppler radar was tracking a strong thunderstorm 23
miles west of Two Buttes Reservoir, or 31 miles northwest of
Springfield. This storm was nearly stationary. Heavy rainfall may
cause hazardous travel conditions due to ponding on roads and lower
visibilities. Some enhanced streamflow in drainages may be observed.
This storm will remain over mainly rural areas of northwestern Baca,
northeastern Las Animas and south central Bent Counties.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Torrential rainfall is also occurring with this storm, and may lead
to localized flooding. Do not drive your vehicle through flooded
roadways.
&&
LAT...LON 3796 10310 3797 10293 3782 10292 3758 10289
3752 10308 3761 10316 3769 10319
TIME...MOT...LOC 1918Z 348DEG 4KT 3774 10301
KSSpecial Weather Statement National Weather Service Pueblo CO 124 PM MDT Wed Aug 4 2021 COZ096-098-042015- Lamar Vicinity/Prowers County CO-Eastern Kiowa County CO- 124 PM MDT Wed Aug 4 2021 At 123 PM MDT, Doppler radar was tracking a strong thunderstorm near Bristol, or 11 miles northeast of Lamar. This storm was nearly stationary. Heavy rainfall may cause hazardous travel conditions due to ponding on roads and lower visibilities. Some enhanced streamflow in drainages may be observed. Locations impacted include... Hartman and Bristol. PRECAUTIONARY/PREPAREDNESS ACTIONS... Torrential rainfall is also occurring with this storm, and may lead to localized flooding. Do not drive your vehicle through flooded roadways. && LAT...LON 3800 10249 3821 10256 3845 10205 3819 10204 TIME...MOT...LOC 1923Z 348DEG 4KT 3816 10243 KS
Special Weather Statement
National Weather Service Pueblo CO
219 PM MDT Wed Aug 4 2021
COZ098-042100-
Lamar Vicinity/Prowers County CO-
219 PM MDT Wed Aug 4 2021
At 217 PM MDT, Doppler radar was tracking a strong thunderstorm near
Lamar, moving east at 20 mph. Heavy rain over Lamar may result in
hazardous travel conditions due to ponding on roads and lower
visiblities. There may be enhanced streamflow in drainages as well.
Locations impacted include...
Lamar.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Torrential rainfall is also occurring with this storm, and may lead
to localized flooding. Do not drive your vehicle through flooded
roadways.
&&
LAT...LON 3795 10273 3813 10273 3814 10246 3811 10240
3804 10239 3795 10239 3793 10245
TIME...MOT...LOC 2017Z 280DEG 16KT 3802 10257
KSPRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE PUEBLO CO
258 PM MDT WED AUG 4 2021
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0256 PM HEAVY RAIN 3 SSE LAMAR 38.05N 102.61W
08/04/2021 M0.80 INCH PROWERS CO TRAINED SPOTTER
STREAM IN NEAR PROXIMITY TO HOUSE DOES NOT
APPEAR TO BE FLOODING AT THIS TIME. RAIN
BEGAN APPROXIMATELY 30 MIN PRIOR.
&&Special Weather Statement
National Weather Service Pueblo CO
308 PM MDT Wed Aug 4 2021
COZ097-098-042145-
Lamar Vicinity/Prowers County CO-Las Animas Vicinity/Bent County CO-
308 PM MDT Wed Aug 4 2021
At 306 PM MDT, Doppler radar was tracking a strong thunderstorm over
Lamar, moving east at 15 mph. Around 1-2" has fallen around Lamar,
but no flooding has been reported. Some enhanced streamflow in
drainages is expected and potentially hazardous travel conditions
due to road ponding and lower visibility due to heavy rain.
Locations impacted include...
Lamar.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Torrential rainfall is also occurring with this storm, and may lead
to localized flooding. Do not drive your vehicle through flooded
roadways.
&&
LAT...LON 3794 10287 3806 10288 3820 10254 3811 10237
3789 10241
TIME...MOT...LOC 2106Z 291DEG 12KT 3807 10260
KSThe Pueblo radar (KPUX), 142 km away, was scanning. The volume nearest the first event began at 21:50 UTC.
1 flash flood, 1 heavy rain. Local standard time, as filed.
Flooding at the intersection of Main street and Olive street. Water was deep enough to require traffic redirection from law enforcement.
Heavy rainfall of 1.22 inches.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Colorado in 2021Every state in 2021This day in weather historyWarnings in Colorado, August 2021
NOAA National Centers for Environmental Information, Storm Events Database, compiled from the National Weather Service’s monthly Storm Data. Complete through 2026-06; NCEI adds each month about 75 days after it ends and revises past years a few times a year. Rebuilt 2026-09-24. Each event’s entry at NCEI: 983184, 983187.