Alert archive / California / Flash Flood Warnings in 2021
Flash Flood Warning 64, NWS Las Vegas, NV
NWS Las Vegas, NV issued this flash flood warning at Jul 25, 2021, 6:59 PM PDT for 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, 6:59 PM PDT (01:59 UTC)
- Expired
- Jul 25, 2021, 10:00 PM PDT
- In force
- 3 hr
- Issued by
- NWS Las Vegas, NV
- Area
- Storm-based polygon
- Damage threat
- Considerable
- Flood severity
- None
County San Bernardino County, CA
The radar
The Las Vegas radar (KESX), 81 km from the middle of the area, began a volume at 02:04 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, 2.0 hours before the alert went out and 129 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.
- 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
The text
As transmitted.
900
WGUS55 KVEF 260159
FFWVEF
CAC071-260500-
/O.NEW.KVEF.FF.W.0064.210726T0159Z-210726T0500Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Las Vegas NV
659 PM PDT Sun Jul 25 2021
The National Weather Service in Las Vegas has issued a
* Flash Flood Warning for...
San Bernardino County in southern California...
* Until 1000 PM PDT.
* At 659 PM PDT, Doppler radar indicated thunderstorms producing
heavy rain across the Mojave Preserve. 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...
Kelso, Cima, Mitchell Caverns, Mid Hills Campground, Hole In The
Wall Campground, Black Canyon Equestrian Campground, Nipton And
Ivanpah Roads and Nipton.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.
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 3547 11542 3549 11527 3522 11521 3477 11561
3480 11587 3515 11603 3538 11564
FLASH FLOOD...RADAR INDICATED
FLASH FLOOD DAMAGE THREAT...CONSIDERABLE
$$
CP2 follow-up statements
578
WGUS75 KVEF 260336
FFSVEF
Flash Flood Statement
National Weather Service Las Vegas NV
836 PM PDT Sun Jul 25 2021
CAC071-260500-
/O.CON.KVEF.FF.W.0064.000000T0000Z-210726T0500Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
San Bernardino CA-
836 PM PDT Sun Jul 25 2021
...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 10 PM PDT THIS
EVENING FOR SAN BERNARDINO COUNTY...
At 836 PM PDT, Most of the heavy rain has ended across the Mojave
Preserve, but over an inch and a half fell across Kelso Cima Road.
Flash flooding is ongoing or expected to begin shortly.
HAZARD...Life-threatening flash flooding. Thunderstorms producing
flash flooding.
SOURCE...Radar.
IMPACT...Life-threatening flash flooding of low-water crossings,
creeks, normally dry washes and roads.
Some locations that will experience flash flooding include...
Kelso, Cima, Mitchell Caverns, Mid Hills Campground, Hole In The
Wall Campground, Black Canyon Equestrian Campground, Nipton And
Ivanpah Roads and Nipton.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.
In hilly terrain there are hundreds of low water crossings which are
potentially dangerous in heavy rain. Do not attempt to cross flooded
roads. Find an alternate route.
&&
LAT...LON 3547 11542 3549 11527 3522 11521 3477 11561
3480 11587 3515 11603 3538 11564
FLASH FLOOD...RADAR INDICATED
FLASH FLOOD DAMAGE THREAT...CONSIDERABLE
$$
CP892
WGUS75 KVEF 260453
FFSVEF
Flash Flood Statement
National Weather Service Las Vegas NV
953 PM PDT Sun Jul 25 2021
CAC071-260503-
/O.EXP.KVEF.FF.W.0064.000000T0000Z-210726T0500Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
San Bernardino CA-
953 PM PDT Sun Jul 25 2021
...FLASH FLOOD WARNING WILL EXPIRE AT 10 PM PDT THIS EVENING FOR SAN
BERNARDINO 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 1100 PM PDT Monday for
portions of southeast California and southern Nevada.
LAT...LON 3547 11542 3549 11527 3522 11521 3477 11561
3480 11587 3515 11603 3538 11564
$$
JVThe office that day
Everything else NWS Las Vegas, NV issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 25, 9:55 PM PDT | Severe Thunderstorm Warning | VEF | Inyo, San Bernardino | 50 min |
| Jul 25, 11:13 PM PDT | Flash Flood Warning | VEF | Inyo, San Bernardino | 3 hr |
| Jul 26, 7:59 AM PDT | Areal Flood Advisory | VEF | San Bernardino | 3 hr |
| Jul 26, 8:12 AM PDT | Flash Flood Warning | 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 | VEF | Inyo, San Bernardino | 3 hr |
| Jul 26, 11:36 AM PDT | Flash Flood Warning | VEF | Inyo, San Bernardino | 3 hr |
| Jul 26, 12:29 PM PDT | Flash Flood Warning | VEF | Inyo | 3 hr |
| Jul 26, 12:51 PM PDT | Flash Flood Warning | VEF | Inyo, San Bernardino | 3 hr |
| Jul 26, 1:12 PM PDT | Flash Flood Warning | VEF | Inyo | 4 hr |
Nearby
Flash Flood Warnings in California, 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; radar from the NEXRAD Level II archive.