Alert archive / California / Flash Flood Warnings in 2021
Flash Flood Warning 107, NWS Las Vegas, NV
NWS Las Vegas, NV issued this flash flood warning at Aug 10, 2021, 11:22 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 10, 2021, 11:22 PM PDT (06:22 UTC)
- Expired
- Aug 11, 2021, 2:30 AM 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 Edwards AFB radar (KEYX), 89 km from the middle of the area, began a volume at 06:21 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, 6.4 hours before the alert went out and 198 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
- 656 J/kg
- Mixed-layer CIN
- -12 J/kg
- Mixed-layer LCL
- 3298 m above ground
- 0-6 km bulk shear
- 11 kt
- 0-1 km storm-relative helicity
- 41 m²/s²
- 0-3 km storm-relative helicity
- 92 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
521
WGUS55 KVEF 110622
FFWVEF
CAC071-110930-
/O.NEW.KVEF.FF.W.0107.210811T0622Z-210811T0930Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Las Vegas NV
1122 PM PDT Tue Aug 10 2021
The National Weather Service in Las Vegas has issued a
* Flash Flood Warning for...
Western San Bernardino County in southern California...
* Until 230 AM PDT.
* At 1122 PM PDT, Doppler radar indicated thunderstorms producing
heavy rain across the warned area. Between 2 and 3 inches of rain
has fallen thus far. 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, normally dry washes and roads.
* Some locations that will experience flash flooding include...
Newberry Springs.
This includes the following highways...
Interstate 40 in California between mile markers 17 and 30.
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.
Please report observed flooding to local emergency services or law
enforcement and request they pass this information to the National
Weather Service when you can do so safely.
&&
LAT...LON 3476 11678 3496 11665 3496 11645 3474 11652
FLASH FLOOD...RADAR INDICATED
FLASH FLOOD DAMAGE THREAT...CONSIDERABLE
$$
TL1 follow-up statement
613 WGUS75 KVEF 110927 FFSVEF Flash Flood Statement National Weather Service Las Vegas NV 227 AM PDT Wed Aug 11 2021 CAC071-110937- /O.EXP.KVEF.FF.W.0107.000000T0000Z-210811T0930Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ San Bernardino CA- 227 AM PDT Wed Aug 11 2021 ...FLASH FLOOD WARNING WILL EXPIRE AT 230 AM PDT EARLY THIS MORNING FOR WESTERN SAN BERNARDINO COUNTY... The heavy rain has ended. Flooding is no longer expected to pose a threat. Please continue to heed remaining road closures. LAT...LON 3476 11678 3496 11665 3496 11645 3474 11652 $$ TL
The office that day
Everything else NWS Las Vegas, NV issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 10, 5:13 PM PDT | Severe Thunderstorm Warning | VEF | San Bernardino | 92 min |
| Aug 10, 5:49 PM PDT | Dust Storm Warning | VEF | San Bernardino | 56 min |
| Aug 10, 6:43 PM PDT | Severe Thunderstorm Warning | VEF | San Bernardino | 47 min |
| Aug 10, 6:55 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.