Alert archive / California / Severe Thunderstorm Warnings in 2021
Severe Thunderstorm Warning 63, NWS Las Vegas, NV
NWS Las Vegas, NV issued this severe thunderstorm warning at Aug 13, 2021, 4:04 PM PDT for San Bernardino County, California. It was in force for 41 min. 1 report came from inside the area while it was in force.
The area
The outline as issued, with what was reported inside it.
The facts
- Issued
- Aug 13, 2021, 4:04 PM PDT (23:04 UTC)
- Expired
- Aug 13, 2021, 4:45 PM PDT
- In force
- 41 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), 83 km from the middle of the area, began a volume at 23:05 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.
What was reported inside it
| Time | Report | Where | Remark |
|---|---|---|---|
| Aug 13, 4:22 PM PDT | TSTM WND GST 60 | 9 Sse Cima, CA | PEAK WIND GUST OF 60 MPH ASSOCIATED WITH A THUNDERSTORM AT APPROXIMATELY 422 PM MEASURED AT MID HILLS CA. SUSTAINED WINDS WITH THE OBSERVATION WERE 7 MPH FROM THE WNW. |
Local storm reports filed while the alert was in force, from inside its polygon or its counties.
The nearest sounding before it
Las Vegas, NV (KVEF), launched 12:00Z, 11.1 hours before the alert went out and 137 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.
330
WUUS55 KVEF 132304
SVRVEF
CAC071-132345-
/O.NEW.KVEF.SV.W.0063.210813T2304Z-210813T2345Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Las Vegas NV
404 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 445 PM PDT.
* At 403 PM PDT, a severe thunderstorm was located over Mid Hills
Campground, or near Cima, moving southwest at 15 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...
Cima, Kelso, Mitchell Caverns, Mid Hills Campground, Black Canyon
Equestrian Campground and Hole In The Wall Campground.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
&&
LAT...LON 3543 11547 3508 11514 3487 11533 3481 11564
3522 11596
TIME...MOT...LOC 2303Z 051DEG 14KT 3515 11545
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.00 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH
$$
DSB2 follow-up statements
003
WWUS55 KVEF 132326
SVSVEF
Severe Weather Statement
National Weather Service Las Vegas NV
426 PM PDT Fri Aug 13 2021
CAC071-132345-
/O.CON.KVEF.SV.W.0063.000000T0000Z-210813T2345Z/
San Bernardino CA-
426 PM PDT Fri Aug 13 2021
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 445 PM PDT
FOR CENTRAL SAN BERNARDINO COUNTY...
At 426 PM PDT, a severe thunderstorm was located near Mid Hills
Campground, or 8 miles northeast of Kelso, moving southwest at 15
mph.
HAZARD...60 mph wind gusts and quarter size hail.
SOURCE...Radar indicated.
IMPACT...Hail damage to vehicles is expected. Expect wind damage to
roofs and trees.
Locations impacted include...
Cima, Kelso, Mitchell Caverns, Mid Hills Campground, Black Canyon
Equestrian Campground and Hole In The Wall Campground.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
&&
LAT...LON 3543 11547 3508 11514 3487 11533 3481 11564
3522 11596
TIME...MOT...LOC 2326Z 051DEG 14KT 3509 11554
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.00 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH
$$
DSB945
WWUS55 KVEF 132340
SVSVEF
Severe Weather Statement
National Weather Service Las Vegas NV
440 PM PDT Fri Aug 13 2021
CAC071-132350-
/O.EXP.KVEF.SV.W.0063.000000T0000Z-210813T2345Z/
San Bernardino CA-
440 PM PDT Fri Aug 13 2021
...THE SEVERE THUNDERSTORM WARNING FOR CENTRAL SAN BERNARDINO COUNTY
WILL EXPIRE AT 445 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. However small hail
and gusty winds are still possible with this thunderstorm.
LAT...LON 3543 11547 3508 11514 3487 11533 3481 11564
3522 11596
TIME...MOT...LOC 2340Z 051DEG 14KT 3506 11559
$$
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, 4:55 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.