Alert archive / California / Severe Thunderstorm Warnings in 2021
Severe Thunderstorm Warning 74, NWS Las Vegas, NV
NWS Las Vegas, NV issued this severe thunderstorm warning at Sep 24, 2021, 2:11 PM PDT for San Bernardino County, California. It was in force for 49 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
- Sep 24, 2021, 2:11 PM PDT (21:11 UTC)
- Expired
- Sep 24, 2021, 3:00 PM PDT
- In force
- 49 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 Santa Ana Mts radar (KSOX), 120 km from the middle of the area, began a volume at 21:13 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 |
|---|---|---|---|
| Sep 24, 2:15 PM PDT | HAIL 1 | 1 Sw Yucca Valley, CA | PUBLIC REPORTED A MIX OF QUARTER AND NICKEL SIZE HAIL. VIDEO SUPPORTED CLAIM. TIME ESTIMATED BY RADAR. |
Local storm reports filed while the alert was in force, from inside its polygon or its counties.
The nearest sounding before it
San Diego, CA (KNKX), launched 12:00Z, 9.2 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
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 1990 m above ground
- 0-6 km bulk shear
- 4 kt
- 0-1 km storm-relative helicity
- -36 m²/s²
- 0-3 km storm-relative helicity
- 15 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
848
WUUS55 KVEF 242111
SVRVEF
CAC071-242200-
/O.NEW.KVEF.SV.W.0074.210924T2111Z-210924T2200Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Las Vegas NV
211 PM PDT Fri Sep 24 2021
The National Weather Service in Las Vegas has issued a
* Severe Thunderstorm Warning for...
South central San Bernardino County in southern California...
* Until 300 PM PDT.
* At 211 PM PDT, a severe thunderstorm was located over Yucca Valley,
or 18 miles east of Onyx Summit, moving north at 10 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...
Yucca Valley, Joshua Tree and Joshua Tree Lake Campground.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
&&
LAT...LON 3406 11656 3411 11656 3414 11647 3421 11644
3427 11644 3426 11622 3414 11620 3412 11622
3412 11626 3408 11627 3408 11644 3404 11647
TIME...MOT...LOC 2111Z 188DEG 10KT 3414 11640
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.00 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH
$$
Outler2 follow-up statements
542
WWUS55 KVEF 242131
SVSVEF
Severe Weather Statement
National Weather Service Las Vegas NV
231 PM PDT Fri Sep 24 2021
CAC071-242200-
/O.CON.KVEF.SV.W.0074.000000T0000Z-210924T2200Z/
San Bernardino CA-
231 PM PDT Fri Sep 24 2021
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 300 PM PDT
FOR SOUTHWESTERN SAN BERNARDINO COUNTY...
At 231 PM PDT, a severe thunderstorm was located near Yucca Valley,
or 18 miles east of Onyx Summit, moving west at 10 mph. Hail to
near quarter size has been reported in Yucca Valley with this storm.
HAZARD...60 mph wind gusts and quarter size hail.
SOURCE...Radar indicated.
IMPACT...Hail damage to vehicles is expected. Expect wind damage to
roofs and trees.
This severe thunderstorm will remain over mainly rural areas of
southwestern San Bernardino County.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
&&
LAT...LON 3406 11656 3411 11656 3414 11647 3408 11644
3404 11647
TIME...MOT...LOC 2131Z 188DEG 10KT 3420 11639
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.00 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH
$$
Outler170
WWUS55 KVEF 242152
SVSVEF
Severe Weather Statement
National Weather Service Las Vegas NV
252 PM PDT Fri Sep 24 2021
CAC071-242201-
/O.EXP.KVEF.SV.W.0074.000000T0000Z-210924T2200Z/
San Bernardino CA-
252 PM PDT Fri Sep 24 2021
...THE SEVERE THUNDERSTORM WARNING FOR SOUTHWESTERN SAN BERNARDINO
COUNTY WILL EXPIRE AT 300 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 3406 11656 3411 11656 3414 11647 3408 11644
3404 11647
TIME...MOT...LOC 2151Z 188DEG 10KT 3425 11638
$$
OutlerThe office that day
Everything else NWS Las Vegas, NV issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Sep 24, 1:49 PM PDT | Areal Flood Advisory | VEF | San Bernardino | 3 hr |
| Sep 24, 2:18 PM PDT | Areal Flood Advisory | VEF | San Bernardino | 3 hr |
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.