Alert archive / Colorado / Flash Flood Warnings in 2021

Flash Flood Warning 70, NWS Pueblo, CO

July 23, 2021Saguache County, Colorado

NWS Pueblo, CO issued this flash flood warning at Jul 23, 2021, 5:19 PM MDT for Saguache 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 23, 2021, 5:19 PM MDT (23:19 UTC)
Expired: Jul 23, 2021, 8:30 PM MDT
In force: 3 hr
Issued by: NWS Pueblo, CO
Area: Storm-based polygon
Flood severity: None

County Saguache County, CO

The radar

The Pueblo radar (KPUX), 172 km from the middle of the area, began a volume at 23:22 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, 11.3 hours before the alert went out and 235 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: 21 J/kg
Mixed-layer CIN: -153 J/kg
Mixed-layer LCL: 1904 m above ground
0-6 km bulk shear: 5 kt
0-1 km storm-relative helicity: -41 m²/s²
0-3 km storm-relative helicity: -27 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

528 
WGUS55 KPUB 232319
FFWPUB
COC109-240230-
/O.NEW.KPUB.FF.W.0070.210723T2319Z-210724T0230Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Pueblo CO
519 PM MDT Fri Jul 23 2021

The National Weather Service in Pueblo has issued a

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

* Until 830 PM MDT.

* At 519 PM MDT, Doppler radar indicated thunderstorms producing 
  heavy rain across the warned area. Between 1 and 2 inches of rain 
  have fallen. The expected rainfall rate is 2.25 to 3.25 inches in 
  1 hour. 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...
  Saguache.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3807 10600 3807 10606 3808 10612 3809 10620
      3810 10620 3812 10620 3818 10620 3818 10616
      3820 10617 3824 10620 3825 10618 3822 10606
      3814 10595 3809 10595

FLASH FLOOD...RADAR INDICATED
EXPECTED RAINFALL...2.25-3.25 INCHES IN 1 HOUR

$$

KS

3 follow-up statements

257 
WGUS75 KPUB 240014
FFSPUB

Flash Flood Statement
National Weather Service Pueblo CO
614 PM MDT Fri Jul 23 2021

COC109-240230-
/O.CON.KPUB.FF.W.0070.000000T0000Z-210724T0230Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Saguache CO-
614 PM MDT Fri Jul 23 2021

...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 830 PM MDT THIS 
EVENING FOR CENTRAL SAGUACHE COUNTY...

At 614 PM MDT, Doppler radar indicated thunderstorms producing heavy 
rain across the warned area. Between 1 and 2 inches of rain have 
fallen. The expected rainfall rate is 0.25 inches in 1 hour. 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...
  Saguache.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3807 10600 3807 10606 3808 10612 3809 10620
      3810 10620 3812 10620 3818 10620 3818 10616
      3820 10617 3824 10620 3825 10618 3822 10606
      3814 10595 3809 10595

FLASH FLOOD...RADAR INDICATED
EXPECTED RAINFALL...0.25 INCHES IN 1 HOUR

$$

KS

598 
WGUS75 KPUB 240130
FFSPUB

Flash Flood Statement
National Weather Service Pueblo CO
730 PM MDT Fri Jul 23 2021

COC109-240230-
/O.CON.KPUB.FF.W.0070.000000T0000Z-210724T0230Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Saguache CO-
730 PM MDT Fri Jul 23 2021

...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 830 PM MDT THIS 
EVENING FOR CENTRAL SAGUACHE COUNTY...

At 730 PM MDT, Doppler radar indicated thunderstorms producing heavy 
rain across the warned area. Between 1 and 2 inches of rain have 
fallen. The expected rainfall rate is 0.25 inches in 1 hour. 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...
  Saguache.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3807 10600 3807 10606 3808 10612 3809 10620
      3810 10620 3812 10620 3818 10620 3818 10616
      3820 10617 3824 10620 3825 10618 3822 10606
      3814 10595 3809 10595

FLASH FLOOD...RADAR INDICATED
EXPECTED RAINFALL...0.25 INCHES IN 1 HOUR

$$

KS

914 
WGUS75 KPUB 240227
FFSPUB

Flash Flood Statement
National Weather Service Pueblo CO
827 PM MDT Fri Jul 23 2021

COC109-240237-
/O.EXP.KPUB.FF.W.0070.000000T0000Z-210724T0230Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Saguache CO-
827 PM MDT Fri Jul 23 2021

...FLASH FLOOD WARNING WILL EXPIRE AT 830 PM MDT THIS EVENING FOR 
CENTRAL SAGUACHE 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 for portions 
of central Colorado, south central Colorado and southeast Colorado.

LAT...LON 3807 10600 3807 10606 3808 10612 3809 10620
      3810 10620 3812 10620 3818 10620 3818 10616
      3820 10617 3824 10620 3825 10618 3822 10606
      3814 10595 3809 10595

$$

KS

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 23, 3:06 AM MDT	Flash Flood Watch	PUB	Alamosa, Chaffee, Conejos, Costilla, Custer, Fremont and 5 more	19 hr
Jul 23, 2:47 PM MDT	Special Weather Statement	PUB	Chaffee	43 min
Jul 23, 3:24 PM MDT	Flash Flood Warning	PUB	Saguache	3 hr
Jul 23, 3:34 PM MDT	Flash Flood Warning Considerable damage threat	PUB	Chaffee, Fremont, Saguache	3 hr
Jul 23, 3:42 PM MDT	Special Weather Statement	PUB	Lake	48 min
Jul 23, 4:53 PM MDT	Flash Flood Warning Considerable damage threat	PUB	Chaffee	5 hr
Jul 23, 5:27 PM MDT	Special Weather Statement	PUB	Saguache	48 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.