Alert archive / Colorado / Flash Flood Warnings in 2021

Flash Flood Warning 122, NWS Pueblo, CO

August 4, 2021Prowers County, Colorado

NWS Pueblo, CO issued this flash flood warning at Aug 4, 2021, 3:31 PM MDT for Prowers County, Colorado. It was in force for 119 min. 2 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: Aug 4, 2021, 3:31 PM MDT (21:31 UTC)
Expired: Aug 4, 2021, 5:30 PM MDT
In force: 119 min
Issued by: NWS Pueblo, CO
Area: Storm-based polygon
Flood severity: None

County Prowers County, CO

The radar

The Pueblo radar (KPUX), 143 km from the middle of the area, began a volume at 21:34 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
Aug 4, 3:50 PM MDT	FLASH FLOOD	Lamar, CO	LAW ENFORCEMENT REPORTS FLOODING AT INTERSECTION OF MAIN STREET AND OLIVE STREET IN ASSOCIATION WITH EARLIER HEAVY RAIN. WATER WAS DEEP ENOUGH TO REQUIRE TRAFFIC REDIRECTION FROM LAW ENFORCEMENT.
Aug 4, 4:35 PM MDT	HEAVY RAIN 1.22	1 Wsw Lamar, 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, 9.5 hours before the alert went out and 206 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: 59 J/kg
Mixed-layer CIN: -62 J/kg
Mixed-layer LCL: 1175 m above ground
0-6 km bulk shear: 15 kt
0-1 km storm-relative helicity: -15 m²/s²
0-3 km storm-relative helicity: -1 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

375 
WGUS55 KPUB 042131
FFWPUB
COC099-050030-
/O.NEW.KPUB.FF.W.0122.210804T2131Z-210805T0030Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Pueblo CO
331 PM MDT Wed Aug 4 2021

The National Weather Service in Pueblo has issued a

* Flash Flood Warning for...
  West Central Prowers County in southeastern Colorado...

* Until 630 PM MDT.

* At 331 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. Some reports of around curb height street flooding has 
  been reported. With heavy rain once again reaching the vicinity, a 
  general Flash Flood warning seems necessary. This is for the city 
  of Lamar.

  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...
  Lamar.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3811 10264 3811 10260 3809 10259 3807 10259
      3804 10259 3804 10262 3806 10264 3809 10264
      3810 10264

FLASH FLOOD...RADAR INDICATED

$$

KS

2 follow-up statements

233 
WGUS75 KPUB 042240
FFSPUB

Flash Flood Statement
National Weather Service Pueblo CO
440 PM MDT Wed Aug 4 2021

COC099-050030-
/O.CON.KPUB.FF.W.0122.000000T0000Z-210805T0030Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Prowers CO-
440 PM MDT Wed Aug 4 2021

...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 630 PM MDT THIS 
EVENING FOR WEST CENTRAL PROWERS COUNTY...

At 440 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.

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...
  Lamar.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3811 10264 3811 10260 3809 10259 3807 10259
      3804 10259 3804 10262 3806 10264 3809 10264
      3810 10264

FLASH FLOOD...RADAR INDICATED

$$

KS

070 
WGUS75 KPUB 042330
FFSPUB

Flash Flood Statement
National Weather Service Pueblo CO
530 PM MDT Wed Aug 4 2021

COC099-042340-
/O.CAN.KPUB.FF.W.0122.000000T0000Z-210805T0030Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Prowers CO-
530 PM MDT Wed Aug 4 2021

...FLASH FLOOD WARNING IS CANCELLED FOR WEST CENTRAL PROWERS 
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. There was a report of law enforcement of traffic 
being diverted off of the Hwy 50 and Hwy 385.

LAT...LON 3811 10264 3811 10260 3809 10259 3807 10259
      3804 10259 3804 10262 3806 10264 3809 10264
      3810 10264

$$

KS

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 3, 6:07 PM MDT	Special Weather Statement	PUB	Otero	38 min
Aug 3, 6:35 PM MDT	Special Weather Statement	PUB	Las Animas	40 min
Aug 3, 7:03 PM MDT	Flash Flood Warning	PUB	Bent	3 hr
Aug 3, 7:06 PM MDT	Flash Flood Warning	PUB	Las Animas, Otero, Pueblo	3 hr
Aug 3, 8:12 PM MDT	Special Weather Statement	PUB	Prowers	48 min
Aug 4, 1:20 PM MDT	Special Weather Statement	PUB	Bent	40 min
Aug 4, 1:24 PM MDT	Special Weather Statement	PUB	Prowers	51 min
Aug 4, 1:59 PM MDT	Flash Flood Warning	PUB	Bent	3 hr
Aug 4, 2:19 PM MDT	Special Weather Statement	PUB	Prowers	41 min
Aug 4, 3:08 PM MDT	Special Weather Statement	PUB	Prowers	37 min
Aug 4, 4:08 PM MDT	Special Weather Statement	PUB	Pueblo	52 min
Aug 4, 4:20 PM MDT	Special Weather Statement	PUB	Baca	55 min
Aug 4, 4:53 PM MDT	Special Weather Statement	PUB	Prowers	37 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.