Alert archive / Colorado / Flash Flood Warnings in 2021

Flash Flood Warning 86, NWS Pueblo, CO

July 25, 2021Fremont County, Colorado

NWS Pueblo, CO issued this flash flood warning at Jul 25, 2021, 6:33 PM MDT for Fremont County, Colorado. It was in force for 3 hr. 3 reports came from inside the area while it was in force.

The area

The outline as issued, with what was reported inside it.

The facts

Issued: Jul 25, 2021, 6:33 PM MDT (00:33 UTC)
Expired: Jul 25, 2021, 9:45 PM MDT
In force: 3 hr
Issued by: NWS Pueblo, CO
Area: Storm-based polygon
Damage threat: Considerable
Flood severity: None

County Fremont County, CO

The radar

The Pueblo radar (KPUX), 90 km from the middle of the area, began a volume at 00:36 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.

What was reported inside it

Time	Report	Where	Remark
Jul 25, 7:00 PM MDT	FLASH FLOOD	3 Nne Canon City, CO	SEVERAL WASH OUTS ALONG CR 9 WITH ROCKS AND BOULDERS WASHED ONTO ROAD BETWEEN MILE 1 THROUGH 10.
Jul 25, 7:30 PM MDT	FLASH FLOOD	Canon City, CO	TRAINED SPOTTER REPORTED SEVERAL ROADS FLOODED THROUGHOUT THE CANON CITY AREA -- WATER DEPTH UPWARDS OF 8 INCHES IN LOW SPOTS.
Jul 25, 9:40 PM MDT	HEAVY RAIN 1.26	2 Ese Canon City, CO

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The nearest sounding before it

Denver, CO (KDNR), launched 00:00Z, 0.6 hours before the alert went out and 231 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: 708 J/kg
Mixed-layer CIN: -59 J/kg
Mixed-layer LCL: 2464 m above ground
0-6 km bulk shear: 32 kt
0-1 km storm-relative helicity: 21 m²/s²
0-3 km storm-relative helicity: 69 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 1.1

Open this sounding in Storm Lab

The text

As transmitted.

595 
WGUS55 KPUB 260033
FFWPUB
COC043-260345-
/O.NEW.KPUB.FF.W.0086.210726T0033Z-210726T0345Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

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

The National Weather Service in Pueblo has issued a

* Flash Flood Warning for...
  East Central Fremont County in central Colorado...

* Until 945 PM MDT.

* At 633 PM MDT, Doppler radar indicated thunderstorms producing 
  heavy rain across the warned area. Between 1 and 1.5 inches of 
  rain have fallen. The expected rainfall rate is 3.25 to 4.5 inches 
  in 1 hour. Flash flooding is ongoing or expected to begin shortly.

  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...
  Canon City.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3850 10527 3850 10525 3852 10518 3845 10509
      3841 10511 3840 10522 3843 10529

FLASH FLOOD...RADAR INDICATED
FLASH FLOOD DAMAGE THREAT...CONSIDERABLE
EXPECTED RAINFALL...3.25-4.5 INCHES IN 1 HOUR

$$

KS

3 follow-up statements

169 
WGUS75 KPUB 260038
FFSPUB

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

COC043-260345-
/O.CON.KPUB.FF.W.0086.000000T0000Z-210726T0345Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Fremont CO-
638 PM MDT Sun Jul 25 2021

...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 945 PM MDT THIS 
EVENING FOR EAST CENTRAL FREMONT COUNTY...

At 638 PM MDT, Doppler radar indicated thunderstorms producing heavy 
rain across the warned area. Between 1 and 1.5 inches of rain have 
fallen and ongoing very heavy rainfall is expected to continue. 
Flash flooding is ongoing or expected to begin shortly.

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...
  Canon City.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3850 10527 3850 10525 3852 10518 3845 10509
      3841 10511 3840 10522 3843 10529

FLASH FLOOD...RADAR INDICATED
FLASH FLOOD DAMAGE THREAT...CONSIDERABLE

$$

KS

815 
WGUS75 KPUB 260144
FFSPUB

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

COC043-260345-
/O.CON.KPUB.FF.W.0086.000000T0000Z-210726T0345Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Fremont CO-
744 PM MDT Sun Jul 25 2021

...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 945 PM MDT THIS 
EVENING FOR EAST CENTRAL FREMONT COUNTY...

At 744 PM MDT, Doppler radar indicated thunderstorms producing heavy 
rain across the warned area. Between 1 and 1.5 inches of rain have 
fallen. Flash flooding is ongoing or expected to begin shortly. 
There are reports of flash flooding from a trained spotter in Canon 
City with 8" of standing water in low spots in Canon City. There 
have also been reports of several wash outs along CR 9 and boulders 
washed onto road between mile 1 and 10.

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...
  Canon City.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3850 10527 3850 10525 3852 10518 3845 10509
      3841 10511 3840 10522 3843 10529

FLASH FLOOD...RADAR INDICATED
FLASH FLOOD DAMAGE THREAT...CONSIDERABLE

$$

KS

761 
WGUS75 KPUB 260335
FFSPUB

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

COC043-260345-
/O.EXP.KPUB.FF.W.0086.000000T0000Z-210726T0345Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Fremont CO-
935 PM MDT Sun Jul 25 2021

...FLASH FLOOD WARNING WILL EXPIRE AT 945 PM MDT THIS EVENING FOR 
EAST CENTRAL FREMONT COUNTY...

Flood waters have receded. The heavy rain has ended. Flooding is no 
longer expected to pose a threat. Please continue to heed remaining 
road closures.

LAT...LON 3850 10527 3850 10525 3852 10518 3845 10509
      3841 10511 3840 10522 3843 10529

$$

KS

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 25, 6:05 PM MDT	Special Weather Statement	PUB	Fremont	55 min
Jul 25, 6:45 PM MDT	Special Weather Statement	PUB	Prowers	45 min
Jul 25, 7:11 PM MDT	Flash Flood Warning Considerable damage threat	PUB	Custer, Fremont	3 hr
Jul 25, 7:27 PM MDT	Special Weather Statement	PUB	Custer	48 min
Jul 25, 7:48 PM MDT	Flash Flood Warning Considerable damage threat	PUB	Custer, Fremont, Pueblo	3 hr
Jul 25, 8:07 PM MDT	Flash Flood Warning Considerable damage threat	PUB	Custer, Huerfano, Pueblo	3 hr
Jul 26, 3:56 PM MDT	Special Weather Statement	PUB	Las Animas	49 min
Jul 26, 4:48 PM MDT	Special Weather Statement	PUB		42 min
Jul 26, 5:35 PM MDT	Special Weather Statement	PUB	Baca	40 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.