Alert archive / California / Severe Thunderstorm Warnings in 2021
Severe Thunderstorm Warning 70, NWS Las Vegas, NV
NWS Las Vegas, NV issued this severe thunderstorm warning at Sep 9, 2021, 2:31 PM PDT for San Bernardino County, California. It was in force for 59 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
- Sep 9, 2021, 2:31 PM PDT (21:31 UTC)
- Expired
- Sep 9, 2021, 3:30 PM PDT
- In force
- 59 min
- Issued by
- NWS Las Vegas, NV
- Area
- Storm-based polygon
- Hail
- 0.75 in
- Wind
- 60.0 mph
County San Bernardino County, CA
The radar
The Santa Ana Mts radar (KSOX), 131 km from the middle of the area, began a volume at 21:35 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 12:00Z, 9.5 hours before the alert went out and 185 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
- 15 J/kg
- Mixed-layer CIN
- -787 J/kg
- Mixed-layer LCL
- 1710 m above ground
- 0-6 km bulk shear
- 28 kt
- 0-1 km storm-relative helicity
- 44 m²/s²
- 0-3 km storm-relative helicity
- 112 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.1
The text
As transmitted.
122
WUUS55 KVEF 092131
SVRVEF
CAC071-092230-
/O.NEW.KVEF.SV.W.0070.210909T2131Z-210909T2230Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Las Vegas NV
231 PM PDT Thu Sep 9 2021
The National Weather Service in Las Vegas has issued a
* Severe Thunderstorm Warning for...
South central San Bernardino County in southern California...
* Until 330 PM PDT.
* At 231 PM PDT, a severe thunderstorm was located near Joshua Tree
Lake Campground, or near Twentynine Palms, moving northwest at 25
mph.
HAZARD...60 mph wind gusts.
SOURCE...Radar indicated.
IMPACT...Expect damage to roofs and trees.
* Locations impacted include...
Twentynine Palms, Yucca Valley, Twentynine Palms Base, Twentynine
Palms Airport, Amboy, Ludlow, Joshua Tree Lake Campground, Joshua
Tree, Morongo Valley, Pioneertown and Johnson Valley.
This includes Interstate 40 in California between mile markers 42 and
83.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
&&
LAT...LON 3410 11660 3414 11647 3426 11644 3432 11648
3436 11641 3453 11642 3453 11646 3460 11647
3461 11650 3469 11649 3474 11642 3481 11561
3403 11560 3403 11600 3412 11605 3412 11626
3408 11627 3408 11644 3403 11648 3403 11661
TIME...MOT...LOC 2131Z 141DEG 21KT 3416 11617
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...<.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH
$$
BKP2 follow-up statements
283
WWUS55 KVEF 092200
SVSVEF
Severe Weather Statement
National Weather Service Las Vegas NV
300 PM PDT Thu Sep 9 2021
CAC071-092230-
/O.CON.KVEF.SV.W.0070.000000T0000Z-210909T2230Z/
San Bernardino CA-
300 PM PDT Thu Sep 9 2021
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 330 PM PDT
FOR SOUTH CENTRAL SAN BERNARDINO COUNTY...
At 259 PM PDT, a severe thunderstorm was located near Joshua Tree
Lake Campground, or 14 miles northwest of Twentynine Palms, moving
northwest at 20 mph.
HAZARD...60 mph wind gusts.
SOURCE...Radar indicated.
IMPACT...Expect damage to roofs and trees.
Locations impacted include...
Twentynine Palms, Twentynine Palms Base, Twentynine Palms Airport,
Ludlow, Joshua Tree Lake Campground, Joshua Tree, Pioneertown and
Johnson Valley.
This includes Interstate 40 in California between mile markers 45 and
49.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
&&
LAT...LON 3414 11647 3426 11644 3432 11648 3436 11641
3453 11642 3453 11646 3460 11647 3461 11650
3469 11649 3474 11642 3470 11584 3403 11579
3403 11600 3412 11605 3412 11626 3408 11627
3411 11638
TIME...MOT...LOC 2159Z 144DEG 19KT 3427 11625
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...<.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH
$$
BKP229
WWUS55 KVEF 092225
SVSVEF
Severe Weather Statement
National Weather Service Las Vegas NV
325 PM PDT Thu Sep 9 2021
CAC071-092235-
/O.EXP.KVEF.SV.W.0070.000000T0000Z-210909T2230Z/
San Bernardino CA-
325 PM PDT Thu Sep 9 2021
...THE SEVERE THUNDERSTORM WARNING FOR SOUTH CENTRAL SAN BERNARDINO
COUNTY WILL EXPIRE AT 330 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 3414 11647 3426 11644 3432 11648 3436 11641
3453 11642 3453 11646 3460 11647 3461 11650
3469 11649 3474 11642 3470 11584 3403 11579
3403 11600 3412 11605 3412 11626 3408 11627
3411 11638
TIME...MOT...LOC 2225Z 141DEG 21KT 3438 11635
$$
BKPThe office that day
Everything else NWS Las Vegas, NV issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Sep 9, 1:47 PM PDT | Severe Thunderstorm Warning | VEF | San Bernardino | 58 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.