Alert archive / Colorado / Flash Flood Warnings in 2021

Flash Flood Warning 84, NWS Pueblo, CO

July 25, 2021Huerfano County, Colorado

NWS Pueblo, CO issued this flash flood warning at Jul 25, 2021, 1:09 PM MDT for Huerfano County, Colorado. It was in force for 3 hr. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued: Jul 25, 2021, 1:09 PM MDT (19:09 UTC)
Expired: Jul 25, 2021, 4:15 PM MDT
In force: 3 hr
Issued by: NWS Pueblo, CO
Area: Storm-based polygon
Damage threat: Considerable
Flood severity: None

County Huerfano County, CO

The radar

The Pueblo radar (KPUX), 122 km from the middle of the area, began a volume at 19:12 UTC, the scan nearest the moment this went out.

Open the radar archive at this moment

The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.

The nearest sounding before it

Denver, CO (KDNR), launched 12:00Z, 7.2 hours before the alert went out and 298 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.

Skew-T log-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.

Mixed-layer CAPE: 1 J/kg
Mixed-layer CIN: -359 J/kg
Mixed-layer LCL: 2126 m above ground
0-6 km bulk shear: 6 kt
0-1 km storm-relative helicity: 26 m²/s²
0-3 km storm-relative helicity: 19 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

128 
WGUS55 KPUB 251909
FFWPUB
COC055-252215-
/O.NEW.KPUB.FF.W.0084.210725T1909Z-210725T2215Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Pueblo CO
109 PM MDT Sun Jul 25 2021

The National Weather Service in Pueblo has issued a

* Flash Flood Warning for...
  Portions of the Northern Spring Burn Scar affecting Portions of...
  Central Huerfano County in southeastern Colorado...

* Until 415 PM MDT.

* At 109 PM MDT, Doppler radar indicated thunderstorms producing 
  heavy rain across the warned area. The expected rainfall rate is 
  0.5 to 1 inch in 1 hour. Flash flooding is ongoing or may begin 
  shortly.

Excessive rainfall over the warning area may cause mud slides near 
steep terrain. The mud slide can consist of rock, mud, vegetation 
and other loose materials.

  HAZARD...Life threatening flash flooding. Thunderstorms
           producing flash flooding.

  SOURCE...Radar.

  IMPACT...Life threatening flash flooding of creeks and streams,
           urban areas, highways, streets and underpasses.

* Some locations that will experience flash flooding include...
  Spring Burn Scar north of Highway 160.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Move away from recently burned areas. Life-threatening flooding of 
creeks, roads and normally dry arroyos may occur. The heavy rains 
will likely trigger rockslides, mudslides and debris flows in steep 
terrain, especially in and around these areas.

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

&&

LAT...LON 3757 10513 3763 10514 3765 10512 3768 10510
      3768 10507 3767 10505 3764 10499 3761 10500
      3759 10504 3755 10508 3756 10511

FLASH FLOOD...RADAR INDICATED
FLASH FLOOD DAMAGE THREAT...CONSIDERABLE
EXPECTED RAINFALL...0.5-1 INCH IN 1 HOUR

$$

Cohen

1 follow-up statement

123 
WGUS75 KPUB 252009
FFSPUB

Flash Flood Statement
National Weather Service Pueblo CO
209 PM MDT Sun Jul 25 2021

COC055-252215-
/O.CON.KPUB.FF.W.0084.000000T0000Z-210725T2215Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Huerfano CO-
209 PM MDT Sun Jul 25 2021

...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 415 PM MDT THIS 
AFTERNOON FOR PORTIONS OF THE NORTHERN SPRING BURN SCAR AFFECTING 
PORTIONS OF CENTRAL HUERFANO COUNTY...

At 209 PM MDT, Doppler radar indicated that the thunderstorms 
producing heavy rain earlier over the northern Spring Burn Scar 
resulted in around 0.5 to 1.0 inch of rainfall accumulation. While 
rainfall rates have decreased, additional showers could produce 
rainfall amounts of 0.1 to 0.2 inch in the warned area. Flash 
flooding is ongoing or may begin shortly.

Excessive rainfall over the warning area may cause mud slides near 
steep terrain. The mud slide can consist of rock, mud, vegetation 
and other loose materials.

HAZARD...Life threatening flash flooding. Thunderstorms producing
         flash flooding.

SOURCE...Radar.

IMPACT...Life threatening flash flooding of creeks and streams,
         urban areas, highways, streets and underpasses.

Some locations that will experience flash flooding include...
  Spring Burn Scar north of Highway 160.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Move away from recently burned areas. Life-threatening flooding of 
creeks, roads and normally dry arroyos may occur. The heavy rains 
will likely trigger rockslides, mudslides and debris flows in steep 
terrain, especially in and around these areas.

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

&&

LAT...LON 3757 10513 3763 10514 3765 10512 3768 10510
      3768 10507 3767 10505 3764 10499 3761 10500
      3759 10504 3755 10508 3756 10511

FLASH FLOOD...RADAR INDICATED
FLASH FLOOD DAMAGE THREAT...CONSIDERABLE
EXPECTED RAINFALL...0.1-0.2 INCHES IN 1 HOUR

$$

Cohen

The office that day

Everything else NWS Pueblo, CO issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jul 24, 6:39 PM MDT	Special Weather Statement	PUB	Alamosa	51 min
Jul 24, 8:49 PM MDT	Flash Flood Warning	PUB	Custer, Saguache	92 min
Jul 25, 12:24 PM MDT	Special Weather Statement	PUB	Huerfano	21 min
Jul 25, 12:31 PM MDT	Flash Flood Warning Considerable damage threat	PUB	Costilla, Huerfano	3 hr
Jul 25, 2:29 PM MDT	Special Weather Statement	PUB	Kiowa	46 min
Jul 25, 2:58 PM MDT	Severe Thunderstorm Warning	PUB	Kiowa	62 min
Jul 25, 3:21 PM MDT	Special Weather Statement	PUB	Kiowa	39 min
Jul 25, 3:37 PM MDT	Severe Thunderstorm Warning	PUB	Kiowa	68 min
Jul 25, 4:38 PM MDT	Special Weather Statement	PUB	El Paso	52 min
Jul 25, 4:45 PM MDT	Special Weather Statement	PUB	Chaffee	60 min
Jul 25, 4:48 PM MDT	Special Weather Statement	PUB	Bent, Kiowa	57 min
Jul 25, 4:49 PM MDT	Special Weather Statement	PUB	Fremont	56 min
Jul 25, 4:51 PM MDT	Special Weather Statement	PUB	Teller	39 min
Jul 25, 4:53 PM MDT	Special Weather Statement	PUB	Douglas	37 min
Jul 25, 5:05 PM MDT	Special Weather Statement	PUB	Crowley, Otero, Pueblo	40 min
Jul 25, 5:07 PM MDT	Special Weather Statement	PUB	El Paso	53 min
Jul 25, 5:09 PM MDT	Special Weather Statement	PUB	Fremont	51 min
Jul 25, 5:15 PM MDT	Special Weather Statement	PUB	Baca	30 min
Jul 25, 5:48 PM MDT	Severe Thunderstorm Warning	PUB	Prowers	55 min
Jul 25, 5:55 PM MDT	Flash Flood Warning Considerable damage threat	PUB	Fremont, Saguache	3 hr
Jul 25, 5:58 PM MDT	Special Weather Statement	PUB	Bent, Otero, Pueblo	47 min

Nearby

Flash Flood Warnings in Colorado, 2021 Every flash flood warning in 2021

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.