Alert archive / California / Flash Flood Warnings in 2021

Flash Flood Warning 70, NWS Las Vegas, NV

July 26, 2021Clark County, Nevada; Inyo County, San Bernardino County, California

NWS Las Vegas, NV issued this flash flood warning at Jul 26, 2021, 10:44 AM PDT for Clark County, Nevada; 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 26, 2021, 10:44 AM PDT (17:44 UTC)
Expired
Jul 26, 2021, 1:45 PM 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, Clark County, NV

The nearest sounding before it

Las Vegas, NV (KVEF), launched 12:00Z, 5.7 hours before the alert went out and 59 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, Las Vegas, NV at 12:00Z on 2021-07-26Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 467 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Las Vegas, NV at 12:00Z on 2021-07-26The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -37 square meters per square second.193958Sfc1 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
467 J/kg
Mixed-layer CIN
-144 J/kg
Mixed-layer LCL
1095 m above ground
0-6 km bulk shear
26 kt
0-1 km storm-relative helicity
-37 m²/s²
0-3 km storm-relative helicity
35 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.3

Open this sounding in Storm Lab

The text

As transmitted.

343 
WGUS55 KVEF 261744
FFWVEF
CAC027-071-NVC003-262045-
/O.NEW.KVEF.FF.W.0070.210726T1744Z-210726T2045Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Las Vegas NV
1044 AM PDT Mon Jul 26 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...
  West Central Clark County in southern Nevada...

* Until 145 PM PDT.

* At 1044 AM PDT, Doppler radar indicated thunderstorms producing 
  heavy rain near Sandy Valley. Between 0.5 and 1 inch of rain has 
  fallen. 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...
  Sandy Valley and Goodsprings.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

Be aware of your surroundings and do not drive on flooded roads.

&&

LAT...LON 3580 11582 3594 11570 3595 11569 3598 11551
      3591 11547 3583 11536 3573 11555 3568 11569

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

$$

CO
2 follow-up statements
766 
WGUS75 KVEF 261903
FFSVEF

Flash Flood Statement
National Weather Service Las Vegas NV
1203 PM PDT Mon Jul 26 2021

CAC027-071-NVC003-262045-
/O.CON.KVEF.FF.W.0070.000000T0000Z-210726T2045Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Inyo CA-San Bernardino CA-Clark NV-
1203 PM PDT Mon Jul 26 2021

...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 145 PM PDT THIS 
AFTERNOON FOR SOUTHEASTERN INYO, SAN BERNARDINO AND WEST CENTRAL 
CLARK COUNTIES...

At 1203 PM PDT, Heaviest rain has lifted north of Sandy Valley but 
localized runoff continues which may make local roads impassable. 
Kingston Road and Sandy Valley roads in particular may be 
temporarily impassable as well as local roadways in Sandy Valley.

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...
  Sandy Valley and Goodsprings.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

Be aware of your surroundings and do not drive on flooded roads.

&&

LAT...LON 3580 11582 3594 11570 3595 11569 3598 11551
      3591 11547 3583 11536 3573 11555 3568 11569

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

$$

CO
932 
WGUS75 KVEF 262038
FFSVEF

Flash Flood Statement
National Weather Service Las Vegas NV
138 PM PDT Mon Jul 26 2021

CAC027-071-NVC003-262048-
/O.EXP.KVEF.FF.W.0070.000000T0000Z-210726T2045Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Inyo CA-San Bernardino CA-Clark NV-
138 PM PDT Mon Jul 26 2021

...FLASH FLOOD WARNING WILL EXPIRE AT 145 PM PDT THIS AFTERNOON FOR 
SOUTHEASTERN INYO, SAN BERNARDINO AND WEST CENTRAL CLARK COUNTIES...

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 1100 PM PDT Monday for 
portions of southeast California and southern Nevada.


LAT...LON 3580 11582 3594 11570 3595 11569 3598 11551
      3591 11547 3583 11536 3573 11555 3568 11569

$$

CO

The office that day

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

IssuedProductOfficeCountiesLasted
Jul 25, 5:12 PM PDTDust Storm WarningVEFClark63 min
Jul 25, 5:37 PM PDTFlash Flood Warning Considerable damage threatVEFLincoln3 hr
Jul 25, 6:01 PM PDTSevere Thunderstorm WarningVEFClark59 min
Jul 25, 6:06 PM PDTSevere Thunderstorm WarningVEFLincoln39 min
Jul 25, 7:08 PM PDTSevere Thunderstorm WarningVEFClark52 min
Jul 25, 7:57 PM PDTSevere Thunderstorm WarningVEFClark, Lincoln63 min
Jul 25, 8:09 PM PDTFlash Flood Warning Considerable damage threatVEFClark3 hr
Jul 25, 8:59 PM PDTFlash Flood Warning Considerable damage threatVEFClark3 hr
Jul 25, 8:59 PM PDTSevere Thunderstorm WarningVEFClark, Nye61 min
Jul 25, 9:55 PM PDTSevere Thunderstorm WarningVEFClark, Nye50 min
Jul 26, 10:20 AM PDTFlash Flood Warning Considerable damage threatVEFClark3 hr
Jul 26, 11:32 AM PDTFlash Flood Warning Considerable damage threatVEFClark, Nye4 hr
Jul 26, 12:29 PM PDTFlash Flood Warning Considerable damage threatVEFNye3 hr
Jul 26, 12:40 PM PDTFlash Flood Warning Considerable damage threatVEFNye3 hr
Jul 26, 1:28 PM PDTFlash Flood Warning Considerable damage threatVEFLincoln3 hr
Jul 26, 2:05 PM PDTSevere Thunderstorm WarningVEFLincoln40 min
Jul 26, 4:30 PM PDTFlash Flood Warning Considerable damage threatVEFLincoln2 hr
Jul 26, 4:34 PM PDTSevere Thunderstorm WarningVEFLincoln41 min
Jul 25, 6:59 PM PDTFlash Flood Warning Considerable damage threatVEFSan Bernardino3 hr
Jul 25, 11:13 PM PDTFlash Flood Warning Considerable damage threatVEFInyo, San Bernardino3 hr
Jul 26, 7:59 AM PDTAreal Flood AdvisoryVEFSan Bernardino3 hr
Jul 26, 8:12 AM PDTFlash Flood Warning Considerable damage threatVEFSan Bernardino3 hr
Jul 26, 9:26 AM PDTAreal Flood AdvisoryVEFSan Bernardino3 hr
Jul 26, 11:36 AM PDTFlash Flood Warning Considerable damage threatVEFInyo, San Bernardino3 hr
Jul 26, 12:51 PM PDTFlash Flood Warning Considerable damage threatVEFInyo, San Bernardino3 hr
Jul 26, 1:12 PM PDTFlash Flood Warning Considerable damage threatVEFInyo4 hr

Nearby

Flash Flood Warnings in California, 2021Flash Flood Warnings in Nevada, 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; the sounding from the Mesonet's radiosonde archive.