Alert archive / California / Severe Thunderstorm Warnings in 2021
Severe Thunderstorm Warning 69, NWS Las Vegas, NV
NWS Las Vegas, NV issued this severe thunderstorm warning at Sep 9, 2021, 1:47 PM PDT for San Bernardino County, California. It was in force for 58 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, 1:47 PM PDT (20:47 UTC)
- Expired
- Sep 9, 2021, 2:45 PM PDT
- In force
- 58 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 Edwards AFB radar (KEYX), 33 km from the middle of the area, began a volume at 20:46 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, 8.8 hours before the alert went out and 231 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
- 353 J/kg
- Mixed-layer CIN
- -332 J/kg
- Mixed-layer LCL
- 3002 m above ground
- 0-6 km bulk shear
- 28 kt
- 0-1 km storm-relative helicity
- 27 m²/s²
- 0-3 km storm-relative helicity
- 39 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
948 WUUS55 KVEF 092047 SVRVEF CAC071-092145- /O.NEW.KVEF.SV.W.0069.210909T2047Z-210909T2145Z/ BULLETIN - IMMEDIATE BROADCAST REQUESTED Severe Thunderstorm Warning National Weather Service Las Vegas NV 147 PM PDT Thu Sep 9 2021 The National Weather Service in Las Vegas has issued a * Severe Thunderstorm Warning for... West central San Bernardino County in southern California... * Until 245 PM PDT. * At 146 PM PDT, a severe thunderstorm was located 7 miles north of I-15 Between Victorville And Barstow, moving northwest at 10 mph. HAZARD...60 mph wind gusts. SOURCE...Radar indicated. IMPACT...Expect damage to roofs and trees. * Locations impacted include... Barstow, I-15 Between Victorville And Barstow and Lenwood. PRECAUTIONARY/PREPAREDNESS ACTIONS... For your protection move to an interior room on the lowest floor of a building. && LAT...LON 3482 11761 3512 11717 3485 11703 3479 11712 TIME...MOT...LOC 2046Z 136DEG 9KT 3484 11721 HAIL THREAT...RADAR INDICATED MAX HAIL SIZE...<.75 IN WIND THREAT...RADAR INDICATED MAX WIND GUST...60 MPH $$ BKP
2 follow-up statements
429 WWUS55 KVEF 092100 SVSVEF Severe Weather Statement National Weather Service Las Vegas NV 200 PM PDT Thu Sep 9 2021 CAC071-092145- /O.CON.KVEF.SV.W.0069.000000T0000Z-210909T2145Z/ San Bernardino CA- 200 PM PDT Thu Sep 9 2021 ...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 245 PM PDT FOR WEST CENTRAL SAN BERNARDINO COUNTY... At 200 PM PDT, a severe thunderstorm was located 14 miles northwest of Barstow, moving northwest at 45 mph. HAZARD...60 mph wind gusts. SOURCE...Radar indicated. IMPACT...Expect damage to roofs and trees. Locations impacted include... Barstow, I-15 Between Victorville And Barstow and Lenwood. PRECAUTIONARY/PREPAREDNESS ACTIONS... For your protection move to an interior room on the lowest floor of a building. && LAT...LON 3482 11761 3512 11717 3485 11703 3479 11712 TIME...MOT...LOC 2100Z 148DEG 39KT 3497 11729 HAIL THREAT...RADAR INDICATED MAX HAIL SIZE...<.75 IN WIND THREAT...RADAR INDICATED MAX WIND GUST...60 MPH $$ BKP
862
WWUS55 KVEF 092136
SVSVEF
Severe Weather Statement
National Weather Service Las Vegas NV
236 PM PDT Thu Sep 9 2021
CAC071-092146-
/O.EXP.KVEF.SV.W.0069.000000T0000Z-210909T2145Z/
San Bernardino CA-
236 PM PDT Thu Sep 9 2021
...THE SEVERE THUNDERSTORM WARNING FOR WEST CENTRAL SAN BERNARDINO
COUNTY WILL EXPIRE AT 245 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 3482 11761 3512 11717 3485 11703 3479 11712
TIME...MOT...LOC 2136Z 136DEG 9KT 3503 11737
$$
BKPThe office that day
Everything else NWS Las Vegas, NV issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Sep 9, 2:31 PM PDT | Severe Thunderstorm Warning | VEF | San Bernardino | 59 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.