Alert archive / California / Severe Thunderstorm Warnings in 2021
Severe Thunderstorm Warning 62, NWS Las Vegas, NV
NWS Las Vegas, NV issued this severe thunderstorm warning at Aug 13, 2021, 3:20 PM PDT for San Bernardino County, California. It was in force for 40 min. 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 13, 2021, 3:20 PM PDT (22:20 UTC)
- Expired
- Aug 13, 2021, 4:00 PM PDT
- In force
- 40 min
- Issued by
- NWS Las Vegas, NV
- Area
- Storm-based polygon
- Hail
- 1.0 in
- Wind
- 60.0 mph
County San Bernardino County, CA
The radar
The Las Vegas radar (KESX), 65 km from the middle of the area, began a volume at 22:21 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 12:00Z, 10.3 hours before the alert went out and 135 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
- 487 J/kg
- Mixed-layer CIN
- -323 J/kg
- Mixed-layer LCL
- 2453 m above ground
- 0-6 km bulk shear
- 11 kt
- 0-1 km storm-relative helicity
- -8 m²/s²
- 0-3 km storm-relative helicity
- 80 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.1
The text
As transmitted.
499
WUUS55 KVEF 132220
SVRVEF
CAC071-132300-
/O.NEW.KVEF.SV.W.0062.210813T2220Z-210813T2300Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Las Vegas NV
320 PM PDT Fri Aug 13 2021
The National Weather Service in Las Vegas has issued a
* Severe Thunderstorm Warning for...
Northeastern San Bernardino County in southern California...
* Until 400 PM PDT.
* At 320 PM PDT, a severe thunderstorm was located 13 miles northeast
of Mid Hills Campground, or 14 miles east of Cima, moving southeast
at 20 mph.
HAZARD...60 mph wind gusts and quarter size hail.
SOURCE...Radar indicated.
IMPACT...Hail damage to vehicles is expected. Expect wind damage
to roofs and trees.
* This severe thunderstorm will remain over mainly rural areas of
northeastern San Bernardino County.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Prepare immediately for large hail and damaging winds. People outside
should move immediately to shelter inside a strong building. Stay
away from windows.
&&
LAT...LON 3528 11539 3542 11517 3518 11487 3490 11517
3508 11539
TIME...MOT...LOC 2220Z 328DEG 18KT 3525 11524
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.00 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH
$$
DSB2 follow-up statements
296
WWUS55 KVEF 132246
SVSVEF
Severe Weather Statement
National Weather Service Las Vegas NV
346 PM PDT Fri Aug 13 2021
CAC071-132300-
/O.CON.KVEF.SV.W.0062.000000T0000Z-210813T2300Z/
San Bernardino CA-
346 PM PDT Fri Aug 13 2021
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 400 PM PDT
FOR NORTHEASTERN SAN BERNARDINO COUNTY...
At 345 PM PDT, a severe thunderstorm was located 13 miles west of
Highway 95 And I-40, or 22 miles southwest of Laughlin, moving
southeast at 20 mph.
HAZARD...60 mph wind gusts and quarter size hail.
SOURCE...Radar indicated.
IMPACT...Hail damage to vehicles is expected. Expect wind damage to
roofs and trees.
This severe thunderstorm will remain over mainly rural areas of
northeastern San Bernardino County.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Prepare immediately for large hail and damaging winds. People outside
should move to a shelter, inside a strong building and away from
windows.
&&
LAT...LON 3528 11539 3542 11517 3518 11487 3490 11517
3508 11539
TIME...MOT...LOC 2245Z 328DEG 18KT 3494 11500
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.00 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH
$$
DSB908
WWUS55 KVEF 132259
SVSVEF
Severe Weather Statement
National Weather Service Las Vegas NV
359 PM PDT Fri Aug 13 2021
CAC071-132309-
/O.EXP.KVEF.SV.W.0062.000000T0000Z-210813T2300Z/
San Bernardino CA-
359 PM PDT Fri Aug 13 2021
...THE SEVERE THUNDERSTORM WARNING FOR NORTHEASTERN SAN BERNARDINO
COUNTY WILL EXPIRE AT 400 PM PDT...
The storm which prompted the warning has moved out of the area.
Therefore, the warning will be allowed to expire. However small hail
and gusty winds are still possible with this thunderstorm.
LAT...LON 3528 11539 3542 11517 3518 11487 3490 11517
3508 11539
TIME...MOT...LOC 2259Z 328DEG 18KT 3489 11496
$$
DSBThe office that day
Everything else NWS Las Vegas, NV issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 13, 2:37 AM PDT | Excessive Heat Watch | VEF | Inyo, San Bernardino | 12 hr |
| Aug 13, 2:18 PM PDT | Excessive Heat Warning | VEF | Inyo, San Bernardino | 3 days |
| Aug 13, 2:23 PM PDT | Severe Thunderstorm Warning | VEF | San Bernardino | 52 min |
| Aug 13, 2:46 PM PDT | Flash Flood Warning | VEF | San Bernardino | 3 hr |
| Aug 13, 4:04 PM PDT | Severe Thunderstorm Warning | VEF | San Bernardino | 41 min |
| Aug 13, 4:55 PM PDT | Severe Thunderstorm Warning | VEF | San Bernardino | 50 min |
Nearby
Severe Thunderstorm Warnings in California, 2021Every severe thunderstorm 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.