Alert archive / Colorado / Flash Flood Warnings in 2021

Flash Flood Warning 94, NWS Pueblo, CO

July 31, 2021Custer County, Colorado

NWS Pueblo, CO issued this flash flood warning at Jul 31, 2021, 2:38 PM MDT for Custer County, Colorado. It was in force for 118 min. 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 31, 2021, 2:38 PM MDT (20:38 UTC)
Expired
Jul 31, 2021, 4:36 PM MDT
In force
118 min
Issued by
NWS Pueblo, CO
Area
Storm-based polygon
Flood severity
None

County Custer County, CO

The radar

The Pueblo radar (KPUX), 119 km from the middle of the area, began a volume at 20:39 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

TimeReportWhereRemark
Jul 31, 3:50 PM MDTHEAVY RAIN 0.511 Wsw Rosita, 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 12:00Z, 8.6 hours before the alert went out and 276 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-pSkew-T log-p diagram, Denver, CO at 12:00Z on 2021-07-31Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 44 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Denver, CO at 12:00Z on 2021-07-31The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -71 square meters per square second.1939Sfc1 km3 km6 km9 kmRMLM
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
44 J/kg
Mixed-layer CIN
-277 J/kg
Mixed-layer LCL
1127 m above ground
0-6 km bulk shear
13 kt
0-1 km storm-relative helicity
-71 m²/s²
0-3 km storm-relative helicity
-21 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted.

649 
WGUS55 KPUB 312038
FFWPUB
COC027-312345-
/O.NEW.KPUB.FF.W.0094.210731T2038Z-210731T2345Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Pueblo CO
238 PM MDT Sat Jul 31 2021

The National Weather Service in Pueblo has issued a

* Flash Flood Warning for...
  Central Custer County in southeastern Colorado...

* Until 545 PM MDT.

* At 238 PM MDT, Doppler radar indicated thunderstorms producing 
  heavy rain across the warned area. Between 1 and 2 inches of rain 
  have fallen. Additional rainfall amounts of 0.5 to 1 inch are 
  possible in the warned area. Flash flooding is ongoing or expected 
  to begin shortly.

  HAZARD...Flash flooding caused by thunderstorms.

  SOURCE...Radar.

  IMPACT...Flash flooding of small creeks and streams, urban
           areas, highways, streets and underpasses as well as
           other poor drainage and low-lying areas.

* Some locations that will experience flash flooding include...
  Silver Cliff, Westcliffe and Rosita.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3817 10567 3819 10531 3802 10520 3790 10545

FLASH FLOOD...RADAR INDICATED

$$

Hodanish
2 follow-up statements
656 
WGUS75 KPUB 312137
FFSPUB

Flash Flood Statement
National Weather Service Pueblo CO
337 PM MDT Sat Jul 31 2021

COC027-312345-
/O.CON.KPUB.FF.W.0094.000000T0000Z-210731T2345Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Custer CO-
337 PM MDT Sat Jul 31 2021

...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 545 PM MDT THIS 
AFTERNOON FOR CENTRAL CUSTER COUNTY...

At 337 PM MDT, Doppler radar indicated thunderstorms producing heavy 
rain across the warned area. Between 1 and 2 inches of rain have 
fallen. Additional rainfall amounts of 0.5 to 1 inch are possible in 
the warned area. Flash flooding is ongoing or expected to begin 
shortly.

HAZARD...Flash flooding caused by thunderstorms.

SOURCE...Radar.

IMPACT...Flash flooding of small creeks and streams, urban areas,
         highways, streets and underpasses as well as other poor
         drainage and low-lying areas.

Some locations that will experience flash flooding include...
  Silver Cliff, Westcliffe and Rosita.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3817 10567 3819 10531 3802 10520 3790 10545

FLASH FLOOD...RADAR INDICATED

$$

KS
564 
WGUS75 KPUB 312236 RRA
FFSPUB

Flash Flood Statement
National Weather Service Pueblo CO
436 PM MDT Sat Jul 31 2021

COC027-312246-
/O.CAN.KPUB.FF.W.0094.000000T0000Z-210731T2345Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Custer CO-
436 PM MDT Sat Jul 31 2021

...FLASH FLOOD WARNING IS CANCELLED FOR CENTRAL CUSTER COUNTY...

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 100 AM MDT Sunday for 
portions of central Colorado, east central Colorado, south central 
Colorado and southeast Colorado.

LAT...LON 3817 10567 3819 10531 3802 10520 3790 10545

$$

KS

The office that day

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

IssuedProductOfficeCountiesLasted
Jul 30, 6:13 PM MDTSpecial Weather StatementPUBDouglas17 min
Jul 31, 12:57 PM MDTSpecial Weather StatementPUBCostilla63 min
Jul 31, 1:12 PM MDTSpecial Weather StatementPUBCuster33 min
Jul 31, 1:39 PM MDTFlash Flood WarningPUBFremont3 hr
Jul 31, 1:56 PM MDTSpecial Weather StatementPUBCuster49 min
Jul 31, 1:59 PM MDTSpecial Weather StatementPUBChaffee46 min
Jul 31, 2:01 PM MDTSpecial Weather StatementPUBChaffee44 min
Jul 31, 2:12 PM MDTRiver Flood WatchPUBPueblo18 hr
Jul 31, 2:12 PM MDTRiver Flood WatchPUBPueblo15 hr
Jul 31, 2:12 PM MDTRiver Flood WatchPUBPueblo13 hr
Jul 31, 2:13 PM MDTSpecial Weather StatementPUBConejos32 min
Jul 31, 2:36 PM MDTFlash Flood Warning Considerable damage threatPUBChaffee3 hr
Jul 31, 2:48 PM MDTFlash Flood WarningPUBChaffee3 hr
Jul 31, 3:11 PM MDTSpecial Weather StatementPUBConejos34 min
Jul 31, 3:22 PM MDTSpecial Weather StatementPUBSaguache38 min
Jul 31, 3:25 PM MDTSpecial Weather StatementPUBAlamosa35 min
Jul 31, 3:30 PM MDTSpecial Weather StatementPUBRio Grande45 min
Jul 31, 3:39 PM MDTSpecial Weather StatementPUBLas Animas36 min
Jul 31, 3:43 PM MDTSpecial Weather StatementPUBBaca32 min
Jul 31, 3:56 PM MDTSpecial Weather StatementPUBHuerfano49 min
Jul 31, 4:05 PM MDTSpecial Weather StatementPUBEl Paso25 min
Jul 31, 4:31 PM MDTFlash Flood WarningPUBEl Paso3 hr
Jul 31, 4:46 PM MDTFlash Flood Warning Considerable damage threatPUBHuerfano4 hr
Jul 31, 4:50 PM MDTFlash Flood Warning Considerable damage threatPUBCuster, Pueblo3 hr
Jul 31, 4:59 PM MDTSpecial Weather StatementPUBBaca31 min
Jul 31, 5:03 PM MDTFlash Flood WarningPUBCuster, Huerfano, Pueblo3 hr
Jul 31, 5:13 PM MDTFlash Flood Warning Considerable damage threatPUBCostilla, Huerfano4 hr
Jul 31, 5:28 PM MDTSpecial Weather StatementPUBBaca32 min
Jul 31, 5:29 PM MDTSpecial Weather StatementPUBBaca46 min
Jul 31, 5:35 PM MDTFlash Flood WarningPUBEl Paso3 hr
Jul 31, 5:43 PM MDTFlash Flood Warning Considerable damage threatPUBCostilla, Huerfano3 hr
Jul 31, 5:45 PM MDTSpecial Weather StatementPUBBaca30 min
Jul 31, 5:55 PM MDTSevere Thunderstorm WarningPUBBaca35 min

Nearby

Flash Flood Warnings in Colorado, 2021Every 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.