Alert archive / California / Flash Flood Warnings in 2021
Flash Flood Warning 125, NWS Las Vegas, NV
NWS Las Vegas, NV issued this flash flood warning at Aug 31, 2021, 5:25 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
- Aug 31, 2021, 5:25 PM PDT (00:25 UTC)
- Expired
- Aug 31, 2021, 8:30 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 San Diego radar (KNKX), 177 km from the middle of the area, began a volume at 00:28 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
San Diego, CA (KNKX), launched 00:00Z, 0.4 hours before the alert went out and 197 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
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 853 m above ground
- 0-6 km bulk shear
- 15 kt
- 0-1 km storm-relative helicity
- -77 m²/s²
- 0-3 km storm-relative helicity
- -65 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
944
WGUS55 KVEF 010025
FFWVEF
CAC071-010330-
/O.NEW.KVEF.FF.W.0125.210901T0025Z-210901T0330Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Las Vegas NV
525 PM PDT Tue Aug 31 2021
The National Weather Service in Las Vegas has issued a
* Flash Flood Warning for...
San Bernardino County in southern California...
* Until 830 PM PDT.
* At 525 PM PDT, Doppler radar indicated thunderstorms producing
heavy rain across the warned area. 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...
State Route 62 (Twentynine Palms Highway) east of Twentynine Palms.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.
&&
LAT...LON 3404 11589 3413 11588 3413 11577 3410 11558
3409 11558 3409 11559 3409 11560 3407 11561
3404 11560 3404 11567 3404 11568 3404 11569
3404 11572 3404 11574 3404 11575 3404 11584
FLASH FLOOD...RADAR INDICATED
FLASH FLOOD DAMAGE THREAT...CONSIDERABLE
$$
JV2 follow-up statements
251
WGUS75 KVEF 010137
FFSVEF
Flash Flood Statement
National Weather Service Las Vegas NV
637 PM PDT Tue Aug 31 2021
CAC071-010330-
/O.CON.KVEF.FF.W.0125.000000T0000Z-210901T0330Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
San Bernardino CA-
637 PM PDT Tue Aug 31 2021
...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 830 PM PDT THIS
EVENING FOR SAN BERNARDINO COUNTY...
At 637 PM PDT, Doppler radar indicated thunderstorms producing heavy
rain continue to push northward into the warned area. Flash flooding
is ongoing or expected to begin shortly along State Route 62.
HAZARD...Life-threatening flash flooding. Thunderstorms producing
flash flooding.
SOURCE...Radar.
IMPACT...Life-threatening flash flooding of low-water crossings,
creeks, normally dry washes and roads.
Some locations that will experience flash flooding include...
State Route 62 (Twentynine Palms Highway) east of Twentynine Palms.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.
&&
LAT...LON 3404 11589 3413 11588 3413 11577 3410 11558
3409 11558 3409 11559 3409 11560 3407 11561
3404 11560 3404 11567 3404 11568 3404 11569
3404 11572 3404 11574 3404 11575 3404 11584
FLASH FLOOD...RADAR INDICATED
FLASH FLOOD DAMAGE THREAT...CONSIDERABLE
$$
JV568
WGUS75 KVEF 010326
FFSVEF
Flash Flood Statement
National Weather Service Las Vegas NV
826 PM PDT Tue Aug 31 2021
CAC071-010336-
/O.EXP.KVEF.FF.W.0125.000000T0000Z-210901T0330Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
San Bernardino CA-
826 PM PDT Tue Aug 31 2021
...FLASH FLOOD WARNING WILL EXPIRE AT 830 PM PDT THIS EVENING FOR
SAN BERNARDINO COUNTY...
The heavy rain has ended, but light to moderate rain continues over
the area. Continue to heed road closures, if applicable. Flood
waters are hard to see at night, so drive carefully over State Route
62 east of Twentynine Palms.
A Flash Flood Watch remains in effect until 200 AM PDT for a portion
of southeast California.
LAT...LON 3404 11589 3413 11588 3413 11577 3410 11558
3409 11558 3409 11559 3409 11560 3407 11561
3404 11560 3404 11567 3404 11568 3404 11569
3404 11572 3404 11574 3404 11575 3404 11584
$$
JVThe office that day
Everything else NWS Las Vegas, NV issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 31, 7:08 PM PDT | Flash Flood Warning | VEF | San Bernardino | 3 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.