Alert archive / Colorado / Flash Flood Warnings in 2021

Flash Flood Warning 59, NWS Pueblo, CO

July 21, 2021Fremont County, Colorado

NWS Pueblo, CO issued this flash flood warning at Jul 21, 2021, 3:38 PM MDT for Fremont County, Colorado. It was in force for 2 hr. 1 report 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 21, 2021, 3:38 PM MDT (21:38 UTC)
Expired: Jul 21, 2021, 5:54 PM MDT
In force: 2 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), 137 km from the middle of the area, began a volume at 21:41 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 21, 4:30 PM MDT	FLASH FLOOD	2 Sse Coaldale, CO	CR40 HAS WATER WASHOVER AND SOME DEBRIS ON IT FROM BUTTER CREEK, OFF THE HAYDEN PASS BURN SCAR.

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

The nearest sounding before it

Grand Junction, CO (KGJT), launched 12:00Z, 9.6 hours before the alert went out and 254 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: 6 J/kg
Mixed-layer CIN: -283 J/kg
Mixed-layer LCL: 2031 m above ground
0-6 km bulk shear: 22 kt
0-1 km storm-relative helicity: 62 m²/s²
0-3 km storm-relative helicity: 90 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

998 
WGUS55 KPUB 212138
FFWPUB
COC043-220045-
/O.NEW.KPUB.FF.W.0059.210721T2138Z-210722T0045Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Pueblo CO
338 PM MDT Wed Jul 21 2021

The National Weather Service in Pueblo has issued a

* Flash Flood Warning for...
  The Hayden Pass burn scar in...
  Southwestern Fremont County in central Colorado...

* Until 645 PM MDT.

* At 338 PM MDT, Doppler radar indicated thunderstorms producing 
  heavy rain over the Hayden Pass Burn Scar. Between .75 and 1.25 
  inches of rain have fallen. The expected rainfall rate is 1 to 
  1.25 inches in 1 hour. Flash flooding is ongoing or expected to 
  begin shortly.

Excessive rainfall over the burn scar will result in debris flow 
moving through the Cottonwood Creek. The debris flow can consist of 
rock, mud, vegetation and other loose materials.

  HAZARD...Life threatening flash flooding. Thunderstorms
           producing flash flooding in and around the Hayden Pass
           Burn Scar.

  SOURCE...Radar.

  IMPACT...Life threatening flash flooding of areas in and around
           the Hayden Pass Burn Scar.

* Some locations that will experience flash flooding include...
  Northern Hayden Pass Burn Scar.

This includes the following high risk locations...
Cutty's Resort On Hayden Creek Road and Big Cottonwood Creek along 
County Road 40.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3836 10578 3835 10571 3828 10567 3832 10581

FLASH FLOOD...RADAR INDICATED
FLASH FLOOD DAMAGE THREAT...CONSIDERABLE
EXPECTED RAINFALL...1-1.25 INCHES IN 1 HOUR

$$

KS

2 follow-up statements

371 
WGUS75 KPUB 212216
FFSPUB

Flash Flood Statement
National Weather Service Pueblo CO
416 PM MDT Wed Jul 21 2021

COC043-220045-
/O.CON.KPUB.FF.W.0059.000000T0000Z-210722T0045Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Fremont CO-
416 PM MDT Wed Jul 21 2021

...FLASH FLOOD WARNING FOR THE HAYDEN PASS BURN SCAR REMAINS IN 
EFFECT UNTIL 645 PM MDT THIS EVENING FOR SOUTHWESTERN FREMONT 
COUNTY...

At 416 PM MDT, Doppler radar indicated thunderstorms producing heavy 
rain over the Hayden Pass Burn Scar. Between 1 and 1.5 inches of 
rain have fallen. The expected rainfall rate is 0.25 to 0.75 inches 
in 1 hour. Flash flooding is ongoing or expected to begin shortly. 
Flash flooding is ongoing or expected to begin shortly. Reports from 
Emergency Managers are that the ditches are full. There is some 
erosion on the road shoulders on CR40.

Excessive rainfall over the burn scar will result in debris flow 
moving through the Cottonwood Creek. The debris flow can consist of 
rock, mud, vegetation and other loose materials.

HAZARD...Life threatening flash flooding. Thunderstorms producing
         flash flooding in and around the Hayden Pass Burn Scar.

SOURCE...Radar.

IMPACT...Life threatening flash flooding of areas in and around
         the Hayden Pass Burn Scar.

Some locations that will experience flash flooding include...
  Northern Hayden Pass Burn Scar.

This includes the following high risk locations...
Cutty's Resort On Hayden Creek Road and Big Cottonwood Creek along 
County Road 40.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3836 10578 3835 10571 3828 10567 3832 10581

FLASH FLOOD...RADAR INDICATED
FLASH FLOOD DAMAGE THREAT...CONSIDERABLE
EXPECTED RAINFALL...0.25-0.75 INCHES IN 1 HOUR

$$

KS

221 
WGUS75 KPUB 212354
FFSPUB

Flash Flood Statement
National Weather Service Pueblo CO
554 PM MDT Wed Jul 21 2021

COC043-220004-
/O.CAN.KPUB.FF.W.0059.000000T0000Z-210722T0045Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Fremont CO-
554 PM MDT Wed Jul 21 2021

...FLASH FLOOD WARNING FOR THE HAYDEN PASS BURN SCAR IS CANCELLED 
FOR SOUTHWESTERN 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.

A Flash Flood Watch remains in effect until 1200 AM MDT Thursday for 
portions of central Colorado, south central Colorado and southeast 
Colorado.

LAT...LON 3836 10578 3835 10571 3828 10567 3832 10581

$$

KS

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 20, 7:03 PM MDT	Special Weather Statement	PUB	Chaffee	12 min
Jul 21, 2:57 AM MDT	Flash Flood Watch	PUB	Alamosa, Chaffee, Conejos, Costilla, Custer, Fremont and 5 more	19 hr
Jul 21, 1:14 PM MDT	Special Weather Statement	PUB	Costilla	61 min
Jul 21, 1:21 PM MDT	Special Weather Statement	PUB	Conejos	54 min
Jul 21, 2:02 PM MDT	Flash Flood Warning Considerable damage threat	PUB	Chaffee	3 hr
Jul 21, 2:25 PM MDT	Special Weather Statement	PUB	Alamosa	35 min
Jul 21, 2:34 PM MDT	Special Weather Statement	PUB	Mineral	56 min
Jul 21, 2:59 PM MDT	Special Weather Statement	PUB	Teller	46 min
Jul 21, 3:40 PM MDT	Special Weather Statement	PUB	Custer	35 min
Jul 21, 3:44 PM MDT	Severe Thunderstorm Warning	PUB	Custer	33 min
Jul 21, 3:57 PM MDT	Special Weather Statement	PUB	Teller	48 min
Jul 21, 4:08 PM MDT	Flash Flood Warning Considerable damage threat	PUB	Custer	3 hr
Jul 21, 5:01 PM MDT	Special Weather Statement	PUB	Saguache	44 min
Jul 21, 5:43 PM MDT	Special Weather Statement	PUB	El Paso	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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.