Alert archive / California / Flash Flood Warnings in 2021

Flash Flood Warning 67, NWS Las Vegas, NV

July 25, 2021Inyo County, San Bernardino County, California

NWS Las Vegas, NV issued this flash flood warning at Jul 25, 2021, 11:13 PM PDT for Inyo County, San Bernardino County, California. 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 25, 2021, 11:13 PM PDT (06:13 UTC)
Expired: Jul 26, 2021, 2:15 AM PDT
In force: 3 hr
Issued by: NWS Las Vegas, NV
Area: Storm-based polygon
Damage threat: Considerable
Flood severity: None

Counties Inyo County, CA, San Bernardino County, CA

The radar

The Edwards AFB radar (KEYX), 147 km from the middle of the area, began a volume at 06:13 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

Las Vegas, NV (KVEF), launched 00:00Z, 6.2 hours before the alert went out and 90 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: 707 J/kg
Mixed-layer CIN: -44 J/kg
Mixed-layer LCL: 2729 m above ground
0-6 km bulk shear: 21 kt
0-1 km storm-relative helicity: 17 m²/s²
0-3 km storm-relative helicity: 81 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

783 
WGUS55 KVEF 260613
FFWVEF
CAC027-071-260915-
/O.NEW.KVEF.FF.W.0067.210726T0613Z-210726T0915Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Las Vegas NV
1113 PM PDT Sun Jul 25 2021

The National Weather Service in Las Vegas has issued a

* Flash Flood Warning for...
  Southeastern Inyo County in south central California...
  San Bernardino County in southern California...

* Until 215 AM PDT.

* At 1113 PM PDT, Doppler radar indicated thunderstorms producing 
  heavy rain across portions of Death Valley National Park. Flash 
  flooding is ongoing or expected to begin shortly.

  HAZARD...Life-threatening flash flooding. Thunderstorms
           producing flash flooding.

  SOURCE...Radar.

  IMPACT...Life-threatening flash flooding of low-water
           crossings, creeks, normally dry washes and roads.

* Some locations that will experience flash flooding include...
  Shoshone, Furnace Creek, Death Valley Junction, Tecopa and Texas 
  Springs Campground.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

Be especially cautious at night when it is harder to recognize the 
dangers of flooding.

In hilly terrain there are hundreds of low water crossings which are 
potentially dangerous in heavy rain. Do not attempt to cross flooded 
roads. Find an alternate route.

&&

LAT...LON 3580 11669 3614 11693 3661 11700 3663 11672
      3581 11566 3581 11565

FLASH FLOOD...RADAR INDICATED
FLASH FLOOD DAMAGE THREAT...CONSIDERABLE

$$

CP

2 follow-up statements

809 
WGUS75 KVEF 260727
FFSVEF

Flash Flood Statement
National Weather Service Las Vegas NV
1227 AM PDT Mon Jul 26 2021

CAC071-260737-
/O.CAN.KVEF.FF.W.0067.000000T0000Z-210726T0915Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
San Bernardino CA-
1227 AM PDT Mon Jul 26 2021

...FLASH FLOOD WARNING IS CANCELLED FOR SAN BERNARDINO COUNTY...

Flooding is no longer expected to pose a threat. Please continue to 
heed remaining road closures.

A Flash Flood Watch remains in effect until 1100 PM PDT Monday for 
portions of southeast California and Nevada.

LAT...LON 3580 11669 3614 11693 3661 11700 3663 11672
      3581 11566 3581 11565

$$

CAC027-260915-
/O.CON.KVEF.FF.W.0067.000000T0000Z-210726T0915Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Inyo CA-
1227 AM PDT Mon Jul 26 2021

...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 215 AM PDT EARLY THIS 
MORNING FOR SOUTHEASTERN INYO COUNTY...

At 1227 AM PDT, Heavy rain has moved out of the warned area. Radar 
estimates indicate 0.75" to over an inch of rainfall has fallen 
across southern portions of Death Valley National Park. Flash 
flooding is ongoing or expected to begin shortly.

HAZARD...Life-threatening flash flooding. Thunderstorms producing
         flash flooding.

SOURCE...Radar.

IMPACT...Life-threatening flash flooding of low-water crossings,
         creeks, normally dry washes and roads.

Some locations that will experience flash flooding include...
  Shoshone, Furnace Creek, Death Valley Junction, Tecopa and Texas 
  Springs Campground.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

Be especially cautious at night when it is harder to recognize the 
dangers of flooding.

In hilly terrain there are hundreds of low water crossings which are 
potentially dangerous in heavy rain. Do not attempt to cross flooded 
roads. Find an alternate route.

&&

LAT...LON 3580 11669 3614 11693 3661 11700 3663 11672
      3581 11566 3581 11565

FLASH FLOOD...RADAR INDICATED
FLASH FLOOD DAMAGE THREAT...CONSIDERABLE

$$

CP

152 
WGUS75 KVEF 260911
FFSVEF

Flash Flood Statement
National Weather Service Las Vegas NV
211 AM PDT Mon Jul 26 2021

CAC027-260921-
/O.EXP.KVEF.FF.W.0067.000000T0000Z-210726T0915Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Inyo CA-
211 AM PDT Mon Jul 26 2021

...FLASH FLOOD WARNING WILL EXPIRE AT 215 AM PDT EARLY THIS MORNING 
FOR SOUTHEASTERN INYO COUNTY...

The heavy rain ended over Death Valley shortly after midnight. 
Flooding is no longer expected to pose a threat. Please continue to 
heed remaining road closures.

A Flash Flood Watch remains in effect until 1100 PM PDT Monday for 
portions of southeast California and Nevada.

LAT...LON 3580 11669 3614 11693 3661 11700 3663 11672
      3581 11566 3581 11565

$$

JA

The office that day

Everything else NWS Las Vegas, NV issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jul 25, 6:59 PM PDT	Flash Flood Warning Considerable damage threat	VEF	San Bernardino	3 hr
Jul 25, 9:55 PM PDT	Severe Thunderstorm Warning	VEF	Inyo, San Bernardino	50 min
Jul 26, 7:59 AM PDT	Areal Flood Advisory	VEF	San Bernardino	3 hr
Jul 26, 8:12 AM PDT	Flash Flood Warning Considerable damage threat	VEF	San Bernardino	3 hr
Jul 26, 9:26 AM PDT	Areal Flood Advisory	VEF	San Bernardino	3 hr
Jul 26, 10:44 AM PDT	Flash Flood Warning Considerable damage threat	VEF	Inyo, San Bernardino	3 hr
Jul 26, 11:36 AM PDT	Flash Flood Warning Considerable damage threat	VEF	Inyo, San Bernardino	3 hr
Jul 26, 12:29 PM PDT	Flash Flood Warning Considerable damage threat	VEF	Inyo	3 hr
Jul 26, 12:51 PM PDT	Flash Flood Warning Considerable damage threat	VEF	Inyo, San Bernardino	3 hr
Jul 26, 1:12 PM PDT	Flash Flood Warning Considerable damage threat	VEF	Inyo	4 hr

Nearby

Flash Flood Warnings in California, 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.