Alert archive / Colorado / Flash Flood Warnings in 2021

Flash Flood Warning 58, NWS Pueblo, CO

July 21, 2021Chaffee County, Colorado

NWS Pueblo, CO issued this flash flood warning at Jul 21, 2021, 2:02 PM MDT for Chaffee 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 21, 2021, 2:02 PM MDT (20:02 UTC)
Expired: Jul 21, 2021, 5:00 PM MDT
In force: 3 hr
Issued by: NWS Pueblo, CO
Area: Storm-based polygon
Damage threat: Considerable
Flood severity: None

County Chaffee County, CO

The radar

The Grand Junction radar (KGJX), 173 km from the middle of the area, began a volume at 20:06 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

Grand Junction, CO (KGJT), launched 12:00Z, 8.0 hours before the alert went out and 199 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.

009 
WGUS55 KPUB 212002
FFWPUB
COC015-212300-
/O.NEW.KPUB.FF.W.0058.210721T2002Z-210721T2300Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

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

The National Weather Service in Pueblo has issued a

* Flash Flood Warning for...
  Central Chaffee County in central Colorado...

* Until 500 PM MDT.

* At 202 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 expected to 
  begin shortly. This Flash Flood Warning is for Chalk Creek and the 
  Chalk Cliffs.

  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...
  Alpine and St Elmo.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

Flooding is occurring or is imminent. It is important to know where 
you are relative to streams, rivers, or creeks which can become 
killers in heavy rains. Campers and hikers should avoid streams or 
creeks.

&&

LAT...LON 3870 10639 3876 10618 3872 10612 3862 10624
      3861 10634

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

$$

KS

3 follow-up statements

834 
WGUS75 KPUB 212104
FFSPUB

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

COC015-212300-
/O.CON.KPUB.FF.W.0058.000000T0000Z-210721T2300Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Chaffee CO-
304 PM MDT Wed Jul 21 2021

...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 5 PM MDT THIS 
AFTERNOON FOR CENTRAL CHAFFEE COUNTY...

At 304 PM MDT, Doppler radar indicated thunderstorms producing heavy 
rain across the warned area. The expected rainfall rate is 0.25 to 
0.5 inches in 1 hour. Flash flooding is ongoing or expected to begin 
shortly.Flash flooding is ongoing or expected to begin shortly. This 
Flash Flood Warning is for Chalk Creek and the Chalk Cliffs.

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...
  Alpine and St Elmo.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

Flooding is occurring or is imminent. It is important to know where 
you are relative to streams, rivers, or creeks which can become 
killers in heavy rains. Campers and hikers should avoid streams or 
creeks.

&&

LAT...LON 3870 10639 3876 10618 3872 10612 3862 10624
      3861 10634

FLASH FLOOD...RADAR INDICATED
FLASH FLOOD DAMAGE THREAT...CONSIDERABLE
EXPECTED RAINFALL...0.25-0.5 INCHES IN 1 HOUR

$$

KS

152 
WGUS75 KPUB 212210
FFSPUB

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

COC015-212300-
/O.CON.KPUB.FF.W.0058.000000T0000Z-210721T2300Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Chaffee CO-
410 PM MDT Wed Jul 21 2021

...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 5 PM MDT THIS 
AFTERNOON FOR CENTRAL CHAFFEE COUNTY...

At 410 PM MDT, Doppler radar indicated thunderstorms producing heavy 
rain across the warned area. The expected rainfall rate is 0.25 to 
0.5 inches in 1 hour. Flash flooding is ongoing or expected to begin 
shortly. Flash flooding is ongoing or expected to begin shortly. 
This Flash Flood Warning is for Chalk Creek and the Chalk Cliffs.

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...
  Alpine and St Elmo.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

Flooding is occurring or is imminent. It is important to know where 
you are relative to streams, rivers, or creeks which can become 
killers in heavy rains. Campers and hikers should avoid streams or 
creeks.

&&

LAT...LON 3870 10639 3876 10618 3872 10612 3862 10624
      3861 10634

FLASH FLOOD...RADAR INDICATED
FLASH FLOOD DAMAGE THREAT...CONSIDERABLE
EXPECTED RAINFALL...0.25-0.5 INCHES IN 1 HOUR

$$

KS

881 
WGUS75 KPUB 212257
FFSPUB

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

COC015-212307-
/O.EXP.KPUB.FF.W.0058.000000T0000Z-210721T2300Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Chaffee CO-
457 PM MDT Wed Jul 21 2021

...FLASH FLOOD WARNING WILL EXPIRE AT 5 PM MDT THIS AFTERNOON FOR 
CENTRAL CHAFFEE 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 3870 10639 3876 10618 3872 10612 3862 10624
      3861 10634

$$

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, 2:25 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, 3:38 PM MDT	Flash Flood Warning Considerable damage threat	PUB	Fremont	2 hr
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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.