Alert archive / California / Severe Thunderstorm Warnings in 2021
Severe Thunderstorm Warning 64, NWS Las Vegas, NV
NWS Las Vegas, NV issued this severe thunderstorm warning at Aug 13, 2021, 4:55 PM PDT for San Bernardino County, California. It was in force for 50 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, 4:55 PM PDT (23:55 UTC)
- Expired
- Aug 13, 2021, 5:45 PM PDT
- In force
- 50 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), 111 km from the middle of the area, began a volume at 23:55 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, 11.9 hours before the alert went out and 166 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.
737
WUUS55 KVEF 132355
SVRVEF
CAC071-140045-
/O.NEW.KVEF.SV.W.0064.210813T2355Z-210814T0045Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Las Vegas NV
455 PM PDT Fri Aug 13 2021
The National Weather Service in Las Vegas has issued a
* Severe Thunderstorm Warning for...
Central San Bernardino County in southern California...
* Until 545 PM PDT.
* At 454 PM PDT, a severe thunderstorm was located 11 miles south of
Mitchell Caverns, moving south at 65 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.
* Locations impacted include...
Mitchell Caverns, Kelso, Amboy, Hole In The Wall Campground, Mid
Hills Campground, Essex and Black Canyon Equestrian Campground.
This includes Interstate 40 in California between mile markers 60 and
115.
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 3516 11586 3520 11522 3469 11499 3450 11557
3460 11602
TIME...MOT...LOC 2354Z 356DEG 56KT 3478 11554
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.00 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH
$$
DSB2 follow-up statements
002
WWUS55 KVEF 140014
SVSVEF
Severe Weather Statement
National Weather Service Las Vegas NV
514 PM PDT Fri Aug 13 2021
CAC071-140045-
/O.CON.KVEF.SV.W.0064.000000T0000Z-210814T0045Z/
San Bernardino CA-
514 PM PDT Fri Aug 13 2021
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 545 PM PDT
FOR CENTRAL SAN BERNARDINO COUNTY...
At 513 PM PDT, a severe thunderstorm was located 14 miles southeast
of Amboy, or 31 miles south of Mitchell Caverns, moving south at 65
mph.
HAZARD...60 mph wind gusts and quarter size hail.
SOURCE...Radar indicated.
IMPACT...Hail damage to vehicles is expected. Expect wind damage to
roofs and trees.
Locations impacted include...
Mitchell Caverns, Kelso, Amboy, Hole In The Wall Campground, Mid
Hills Campground, Essex and Black Canyon Equestrian Campground.
This includes Interstate 40 in California between mile markers 60 and
115.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Prepare immediately for large hail and damaging winds. People outside
should move to a shelter, inside a strong building and away from
windows.
&&
LAT...LON 3516 11586 3520 11522 3469 11499 3450 11557
3460 11602
TIME...MOT...LOC 0013Z 356DEG 56KT 3448 11551
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.00 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH
$$
DSB427
WWUS55 KVEF 140041
SVSVEF
Severe Weather Statement
National Weather Service Las Vegas NV
541 PM PDT Fri Aug 13 2021
CAC071-140051-
/O.EXP.KVEF.SV.W.0064.000000T0000Z-210814T0045Z/
San Bernardino CA-
541 PM PDT Fri Aug 13 2021
...THE SEVERE THUNDERSTORM WARNING FOR CENTRAL SAN BERNARDINO COUNTY
WILL EXPIRE AT 545 PM PDT...
The storm which prompted the warning has weakened below severe
limits, and no longer poses an immediate threat to life or property.
Therefore, the warning will be allowed to expire.
LAT...LON 3516 11586 3520 11522 3469 11499 3450 11557
3460 11602
TIME...MOT...LOC 0041Z 356DEG 56KT 3410 11548
$$
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, 3:20 PM PDT | Severe Thunderstorm Warning | VEF | San Bernardino | 40 min |
| Aug 13, 4:04 PM PDT | Severe Thunderstorm Warning | VEF | San Bernardino | 41 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.