Alert archive / Colorado / Flash Flood Warnings in 2020

Flash Flood Warning 38, NWS Pueblo, CO

July 26, 2020Huerfano County, Colorado

NWS Pueblo, CO issued this flash flood warning at Jul 26, 2020, 3:32 PM MDT for Huerfano County, Colorado. It was in force for 113 min. 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 26, 2020, 3:32 PM MDT (21:32 UTC)
Expired: Jul 26, 2020, 5:25 PM MDT
In force: 113 min
Issued by: NWS Pueblo, CO
Area: Storm-based polygon
Damage threat: Considerable
Flood severity: None

County Huerfano County, CO

The radar

The Pueblo radar (KPUX), 124 km from the middle of the area, began a volume at 21:31 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

Denver, CO (KDNR), launched 12:00Z, 9.5 hours before the alert went out and 298 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: 7 J/kg
Mixed-layer CIN: -218 J/kg
Mixed-layer LCL: 1441 m above ground
0-6 km bulk shear: 23 kt
0-1 km storm-relative helicity: -6 m²/s²
0-3 km storm-relative helicity: -6 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

476 
WGUS55 KPUB 262132
FFWPUB
COC055-270030-
/O.NEW.KPUB.FF.W.0038.200726T2132Z-200727T0030Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Pueblo CO
332 PM MDT Sun Jul 26 2020

The National Weather Service in Pueblo has issued a

* Flash Flood Warning for...
  West central Huerfano County in southeastern Colorado...

* Until 630 PM MDT.

* At 332 PM MDT, Doppler radar indicated thunderstorms producing
  heavy rain across the warned area. Up to one inch of rain has
  already fallen. Flash flooding is ongoing or expected to begin
  shortly.

  HAZARD...Life threatening flash flooding. Heavy rain producing 
           flash flooding.

  SOURCE...Radar indicated.

  IMPACT...Life threatening flash flooding of creeks and streams, 
           urban areas, highways, streets and underpasses.

* Some locations that will experience flooding include...
  Spring Burn Scar north of Highway 160.

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

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Move away from recently burned areas. Life-threatening flooding of
creeks, roads and normally dry arroyos is likely. The heavy rains
will likely trigger rockslides, mudslides and debris flows in steep
terrain, especially in and around these areas.

&&

LAT...LON 3770 10513 3761 10506 3761 10515 3763 10523
      3768 10529

FLASH FLOOD...RADAR INDICATED
FLASH FLOOD DAMAGE THREAT...CONSIDERABLE
EXPECTED RAINFALL...0.50-1 INCHES IN 1 HOUR

$$

PGW

2 follow-up statements

906 
WGUS75 KPUB 262210
FFSPUB

Flash Flood Statement
National Weather Service Pueblo CO
410 PM MDT Sun Jul 26 2020

COC055-270030-
/O.CON.KPUB.FF.W.0038.000000T0000Z-200727T0030Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Huerfano CO-
410 PM MDT Sun Jul 26 2020

...THE FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 630 PM MDT FOR
WEST CENTRAL HUERFANO COUNTY...

At 407 PM MDT, Doppler radar indicated thunderstorms producing heavy 
rain has moved east of the Spring creek Burn Scar. Up to one and one 
half inches of rain has already fallen. Flash flooding is ongoing or 
expected to begin shortly.

HAZARD...Life threatening flash flooding. Heavy rain producing flash 
         flooding.

SOURCE...Radar indicated.

IMPACT...Life threatening flash flooding of creeks and streams, 
         urban areas, highways, streets and underpasses.

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

Some locations that will experience flooding include...
Spring Burn Scar north of Highway 160.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Remain alert for flooding even in locations not receiving rain.
Arroyos, streams, and rivers can become raging killer currents in a
matter of minutes, even from distant rainfall.

Move away from recently burned areas. Life-threatening flooding of
creeks, roads and normally dry arroyos is likely. The heavy rains
will likely trigger rockslides, mudslides and debris flows in steep
terrain, especially in and around these areas.

&&

LAT...LON 3770 10513 3761 10506 3761 10515 3763 10523
      3768 10529

FLASH FLOOD...RADAR INDICATED
FLASH FLOOD DAMAGE THREAT...CONSIDERABLE
EXPECTED RAINFALL...up to 0.2 INCHES IN THE NEXT 30 MINUTES. 

$$

PGW

964 
WGUS75 KPUB 262325
FFSPUB

Flash Flood Statement
National Weather Service Pueblo CO
525 PM MDT Sun Jul 26 2020

COC055-262334-
/O.CAN.KPUB.FF.W.0038.000000T0000Z-200727T0030Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Huerfano CO-
525 PM MDT Sun Jul 26 2020

...THE FLASH FLOOD WARNING FOR WEST CENTRAL HUERFANO COUNTY IS
CANCELLED...

The warning for the northern portion of the Spring Burn Scar has 
been cancelled.  The heavy rain has ended. Flooding is no longer 
expected to pose a threat. Please continue to heed any remaining 
road closures.

LAT...LON 3770 10513 3761 10506 3761 10515 3763 10523
      3768 10529

$$

PGW

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 26, 1:36 PM MDT	Special Weather Statement	PUB		39 min
Jul 26, 1:52 PM MDT	Flash Flood Warning	PUB	Las Animas	2 hr
Jul 26, 2:30 PM MDT	Special Weather Statement	PUB	Costilla	15 min
Jul 26, 3:07 PM MDT	Flash Flood Warning	PUB	Huerfano	113 min
Jul 26, 3:25 PM MDT	Special Weather Statement	PUB	Huerfano	20 min
Jul 26, 3:42 PM MDT	Flash Flood Warning	PUB	Las Animas	108 min
Jul 26, 4:19 PM MDT	Special Weather Statement	PUB	Prowers	26 min
Jul 26, 4:54 PM MDT	Flash Flood Warning Considerable damage threat	PUB	Chaffee, Fremont, Saguache	5 hr

Nearby

Flash Flood Warnings in Colorado, 2020 Every flash flood warning in 2020

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.