Alert archive / California / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 46, NWS Las Vegas, NV

August 22, 2012San Bernardino County, California

NWS Las Vegas, NV issued this severe thunderstorm warning at Aug 22, 2012, 11:27 AM PDT for San Bernardino County, California. It was in force for 48 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
Aug 22, 2012, 11:27 AM PDT (18:27 UTC)
Expired
Aug 22, 2012, 12:15 PM PDT
In force
48 min
Issued by
NWS Las Vegas, NV
Area
Storm-based polygon

County San Bernardino County, CA

The radar

The Santa Ana Mts radar (KSOX), 130 km from the middle of the area, began a volume at 18:27 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, 6.5 hours before the alert went out and 172 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, San Diego, CA at 12:00Z on 2012-08-22Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 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, San Diego, CA at 12:00Z on 2012-08-22The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 5 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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
596 m above ground
0-6 km bulk shear
20 kt
0-1 km storm-relative helicity
5 m²/s²
0-3 km storm-relative helicity
6 m²/s²
Significant tornado parameter
0.0
Supercell composite
-0.0

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

053 
WUUS55 KVEF 221827
SVRVEF
CAC071-221915-
/O.NEW.KVEF.SV.W.0046.120822T1827Z-120822T1915Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE LAS VEGAS NV
1127 AM PDT WED AUG 22 2012

THE NATIONAL WEATHER SERVICE IN LAS VEGAS HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  SOUTH CENTRAL SAN BERNARDINO COUNTY IN SOUTHERN CALIFORNIA...

* UNTIL 1215 PM PDT.

* AT 1121 AM PDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING QUARTER SIZE HAIL...AND
  DAMAGING WINDS IN EXCESS OF 60 MPH.  THIS STORM WAS LOCATED NEAR
  JOSHUA TREE...OR 13 MILES WEST OF TWENTYNINE PALMS...AND WAS MOVING
  NORTHEAST AT 20 MPH.

* LOCATIONS IMPACTED INCLUDE...
  JPSHUA TREE...JOSHUA TREE LAKE CAMPGROUND.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

THIS STORM IS CAPABLE OF PRODUCING LARGE HAIL THAT CAN CAUSE INJURY
AND DAMAGE PROPERTY. IN ADDITION...STRONG WINDS AND LIGHTNING ARE
LIKELY. LIGHTNING CAN KILL! TAKE SHELTER IN A STURDY BUILDING. IF IT
IS SAFE TO DO SO...TAKE APPROPRIATE ACTIONS TO PROTECT VEHICLES AND
PROPERTY.

REPORT SEVERE WEATHER BY POSTING YOUR REPORT TO THE LAS VEGAS
NATIONAL WEATHER SERVICE FACEBOOK PAGE...OR BY USING THE TWITTER
HASHTAG...NWSVEGAS.

&&

LAT...LON 3416 11641 3426 11625 3414 11615 3412 11617
      3412 11626 3408 11627 3408 11635
TIME...MOT...LOC 1827Z 237DEG 17KT 3413 11626

$$

ASG
2 follow-up statements
377 
WWUS55 KVEF 221848
SVSVEF

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE LAS VEGAS NV
1148 AM PDT WED AUG 22 2012

CAC071-221915-
/O.CON.KVEF.SV.W.0046.000000T0000Z-120822T1915Z/
SAN BERNARDINO CA-
1148 AM PDT WED AUG 22 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 1215 PM PDT
FOR SOUTH CENTRAL SAN BERNARDINO COUNTY...

AT 1143 AM PDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO
INDICATE A SEVERE THUNDERSTORM CAPABLE OF PRODUCING QUARTER SIZE
HAIL...AND DAMAGING WINDS IN EXCESS OF 60 MPH.  THIS STORM WAS
LOCATED NEAR JOSHUA TREE LAKE CAMPGROUND...OR 7 MILES WEST OF
TWENTYNINE PALMS...AND WAS MOVING NORTHEAST AT 20 MPH.

LOCATIONS IMPACTED INCLUDE...
JOSHUA TREE...JOSHUA TREE LAKE CAMPGROUND.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

THIS STORM IS CAPABLE OF PRODUCING LARGE HAIL THAT CAN CAUSE INJURY
AND DAMAGE PROPERTY. IN ADDITION...STRONG WINDS AND LIGHTNING ARE
LIKELY. LIGHTNING CAN KILL! TAKE SHELTER IN A STURDY BUILDING. IF IT
IS SAFE TO DO SO...TAKE APPROPRIATE ACTIONS TO PROTECT VEHICLES AND
PROPERTY.

REPORT SEVERE WEATHER BY POSTING YOUR REPORT TO THE LAS VEGAS
NATIONAL WEATHER SERVICE FACEBOOK PAGE...OR BY USING THE TWITTER
HASHTAG...NWSVEGAS.

&&

LAT...LON 3416 11641 3426 11625 3414 11615 3412 11617
      3412 11626 3408 11627 3408 11635
TIME...MOT...LOC 1848Z 237DEG 17KT 3418 11616

$$

ASG
050 
WWUS55 KVEF 221907
SVSVEF

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE LAS VEGAS NV
1207 PM PDT WED AUG 22 2012

CAC071-221916-
/O.EXP.KVEF.SV.W.0046.000000T0000Z-120822T1915Z/
SAN BERNARDINO CA-
1207 PM PDT WED AUG 22 2012

...THE SEVERE THUNDERSTORM WARNING FOR SOUTH CENTRAL SAN BERNARDINO
COUNTY WILL EXPIRE AT 1215 PM PDT...

THE THUNDERSTORM THAT PROMPTED THE WARNING HAS MOVED TO THE 
NORTHEAST AND WEAKENED. HEAVY RAIN AND GUSTY WINDS ARE STILL 
POSSIBLE. 

LAT...LON 3416 11641 3426 11625 3414 11615 3412 11617
      3412 11626 3408 11627 3408 11635
TIME...MOT...LOC 1906Z 237DEG 17KT 3423 11607

$$

ASG

The office that day

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

IssuedProductOfficeCountiesLasted
Aug 21, 7:57 PM PDTSevere Thunderstorm WarningVEFSan Bernardino48 min
Aug 22, 3:53 AM PDTAreal Flood AdvisoryVEFInyo3 hr
Aug 22, 9:19 AM PDTAreal Flood AdvisoryVEFInyo, San Bernardino3 hr
Aug 22, 9:34 AM PDTFlash Flood WarningVEFInyo, San Bernardino116 min
Aug 22, 9:45 AM PDTFlash Flood WarningVEFSan Bernardino2 hr
Aug 22, 10:05 AM PDTSevere Thunderstorm WarningVEFSan Bernardino25 min
Aug 22, 10:45 AM PDTFlash Flood WarningVEFSan Bernardino2 hr
Aug 22, 10:49 AM PDTFlash Flood WarningVEFSan Bernardino116 min
Aug 22, 11:30 AM PDTFlash Flood WarningVEFSan Bernardino56 min
Aug 22, 11:50 AM PDTFlash Flood WarningVEFSan Bernardino54 min
Aug 22, 11:58 AM PDTFlash Flood WarningVEFSan Bernardino2 hr
Aug 22, 1:03 PM PDTFlash Flood WarningVEFSan Bernardino87 min
Aug 22, 1:42 PM PDTFlash Flood WarningVEFSan Bernardino3 hr
Aug 22, 1:47 PM PDTFlash Flood WarningVEFInyo36 min
Aug 22, 1:50 PM PDTFlash Flood WarningVEFSan Bernardino115 min
Aug 22, 1:55 PM PDTFlash Flood WarningVEFSan Bernardino3 hr
Aug 22, 2:57 PM PDTFlash Flood WarningVEFInyo2 hr
Aug 22, 3:55 PM PDTFlash Flood WarningVEFInyo65 min

Nearby

Severe Thunderstorm Warnings in California, 2012Every severe thunderstorm warning in 2012

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.