Alert archive / California / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 6, NWS Las Vegas, NV

June 29, 2021San Bernardino County, California

NWS Las Vegas, NV issued this severe thunderstorm warning at Jun 29, 2021, 11:44 AM PDT for San Bernardino County, California. It was in force for 27 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
Jun 29, 2021, 11:44 AM PDT (18:44 UTC)
Expired
Jun 29, 2021, 12:11 PM PDT
In force
27 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 Las Vegas radar (KESX), 55 km from the middle of the area, began a volume at 18:45 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, 6.7 hours before the alert went out and 104 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.

Skew-T log-pSkew-T log-p diagram, Las Vegas, NV at 12:00Z on 2021-06-29Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 41 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Las Vegas, NV at 12:00Z on 2021-06-29The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 19 square meters per square second.193958Sfc1 km3 km6 km9 kmRMLM
The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.
Mixed-layer CAPE
41 J/kg
Mixed-layer CIN
-205 J/kg
Mixed-layer LCL
3715 m above ground
0-6 km bulk shear
15 kt
0-1 km storm-relative helicity
19 m²/s²
0-3 km storm-relative helicity
38 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted.

704 
WUUS55 KVEF 291844
SVRVEF
CAC071-291930-
/O.NEW.KVEF.SV.W.0006.210629T1844Z-210629T1930Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Las Vegas NV
1144 AM PDT Tue Jun 29 2021

The National Weather Service in Las Vegas has issued a

* Severe Thunderstorm Warning for...
  North central San Bernardino County in southern California...

* Until 1230 PM PDT.

* At 1142 AM PDT, a severe thunderstorm was located near Nipton And
  Ivanpah Roads, or 11 miles south of Primm, moving northeast at 10 
  mph. The thunderstorm is also just to the east of Mountain Pass on 
  Interstate 15. The storm is moving slowly to the east.

  HAZARD...60 mph wind gusts.

  SOURCE...Radar indicated.

  IMPACT...Expect damage to roofs and trees.

* Locations impacted include...
  Nipton, Mountain Pass and Nipton And Ivanpah Roads. 

This includes Interstate 15 in California between mile markers 169
and 186.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

For your protection move to an interior room on the lowest floor of a
building.

&&

LAT...LON 3534 11541 3544 11559 3570 11552 3542 11517
TIME...MOT...LOC 1842Z 215DEG 7KT 3546 11545 

HAIL...<.75IN
WIND...60MPH
 
$$

SC
2 follow-up statements
398 
WWUS55 KVEF 291903
SVSVEF

Severe Weather Statement
National Weather Service Las Vegas NV
1203 PM PDT Tue Jun 29 2021

CAC071-291930-
/O.CON.KVEF.SV.W.0006.000000T0000Z-210629T1930Z/
San Bernardino CA-
1203 PM PDT Tue Jun 29 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 1230 PM PDT
FOR NORTHEASTERN SAN BERNARDINO COUNTY...

At 1202 PM PDT, a severe thunderstorm was located near Nipton And
Ivanpah Roads, or 8 miles south of Primm, moving northeast at 10 mph.

HAZARD...60 mph wind gusts.

SOURCE...Radar indicated.

IMPACT...Expect damage to roofs and trees.

Locations impacted include...
Nipton, Nipton And Ivanpah Roads and Mountain Pass. 

This includes Interstate 15 in California between mile markers 172
and 185.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

For your protection move to an interior room on the lowest floor of a
building.

&&

LAT...LON 3541 11543 3547 11554 3566 11548 3545 11522
TIME...MOT...LOC 1902Z 210DEG 9KT 3550 11543 

HAIL...<.75IN
WIND...60MPH
 
$$

SC
844 
WWUS55 KVEF 291911
SVSVEF

Severe Weather Statement
National Weather Service Las Vegas NV
1211 PM PDT Tue Jun 29 2021

CAC071-291920-
/O.CAN.KVEF.SV.W.0006.000000T0000Z-210629T1930Z/
San Bernardino CA-
1211 PM PDT Tue Jun 29 2021

...THE SEVERE THUNDERSTORM WARNING FOR NORTHEASTERN SAN BERNARDINO
COUNTY IS CANCELLED...
                
The storm which prompted the warning south of Primm has weakened 
below severe limits, and no longer poses an immediate threat to life 
or property. Therefore, the warning has been cancelled.

LAT...LON 3541 11543 3547 11554 3566 11548 3545 11522
TIME...MOT...LOC 1909Z 215DEG 7KT 3551 11542 

$$

SC

The office that day

Everything else NWS Las Vegas, NV issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Jun 29, 4:23 PM PDTAreal Flood AdvisoryVEFInyo3 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.