Alert archive / California / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 48, NWS Las Vegas, NV

August 29, 2012San Bernardino County, California

NWS Las Vegas, NV issued this severe thunderstorm warning at Aug 29, 2012, 3:23 PM PDT for San Bernardino County, California. It was in force for 37 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 29, 2012, 3:23 PM PDT (22:23 UTC)
Expired
Aug 29, 2012, 4:00 PM PDT
In force
37 min
Issued by
NWS Las Vegas, NV
Area
Storm-based polygon

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 22:24 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, 10.4 hours before the alert went out and 192 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 2012-08-29Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 50 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, San Diego, CA at 12:00Z on 2012-08-29The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -11 square meters per square second.1939Sfc1 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
50 J/kg
Mixed-layer CIN
-642 J/kg
Mixed-layer LCL
1726 m above ground
0-6 km bulk shear
7 kt
0-1 km storm-relative helicity
-11 m²/s²
0-3 km storm-relative helicity
45 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.

431 
WUUS55 KVEF 292223
SVRVEF
CAC071-292300-
/O.NEW.KVEF.SV.W.0048.120829T2223Z-120829T2300Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE LAS VEGAS NV
323 PM PDT WED AUG 29 2012

THE NATIONAL WEATHER SERVICE IN LAS VEGAS HAS ISSUED A

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

* UNTIL 400 PM PDT.

* AT 319 PM PDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING DAMAGING WINDS IN EXCESS
  OF 60 MPH.  THIS STORM WAS LOCATED OVER SOUTH CENTRAL SAN
  BERNARDINO COUNTY...OR 23 MILES NORTHWEST OF TWENTYNINE PALMS...AND
  WAS MOVING NORTH AT 10 MPH.

* LOCATIONS IMPACTED INCLUDE...
  MAINLY RURAL AREAS OF SOUTHERN SAN BERNARDINO COUNTY.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

THIS STORM IS CAPABLE OF PRODUCING DAMAGING WINDS WHICH CAN BRING
DOWN TREES AND POWER LINES AND CAUSE SIGNIFICANT BLOWING DUST AND
DEBRIS. IN ADDITION...HAIL AND LIGHTNING ARE LIKELY. LIGHTNING CAN
KILL! TAKE COVER IN A SUBSTANTIAL SHELTER AND STAY AWAY FROM WINDOWS
UNTIL THE STORM PASSES.

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 3424 11644 3432 11647 3438 11640 3446 11640
      3447 11642 3450 11642 3451 11641 3452 11629
      3425 11628
TIME...MOT...LOC 2223Z 173DEG 7KT 3433 11640

$$

PIERCE
2 follow-up statements
098 
WWUS55 KVEF 292241
SVSVEF

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE LAS VEGAS NV
341 PM PDT WED AUG 29 2012

CAC071-292300-
/O.CON.KVEF.SV.W.0048.000000T0000Z-120829T2300Z/
SAN BERNARDINO CA-
341 PM PDT WED AUG 29 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 400 PM PDT
FOR SOUTH CENTRAL SAN BERNARDINO COUNTY...

AT 336 PM PDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO
INDICATE A SEVERE THUNDERSTORM CAPABLE OF PRODUCING DAMAGING WINDS IN
EXCESS OF 60 MPH.  THIS STORM WAS LOCATED OVER SOUTH CENTRAL SAN
BERNARDINO COUNTY...OR 22 MILES NORTHWEST OF TWENTYNINE PALMS...AND
WAS MOVING NORTH AT 5 MPH.

LOCATIONS IMPACTED INCLUDE...LANDERS.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

THIS STORM IS CAPABLE OF PRODUCING DAMAGING WINDS WHICH CAN BRING
DOWN TREES AND POWER LINES AND CAUSE SIGNIFICANT BLOWING DUST AND
DEBRIS. IN ADDITION...HAIL AND LIGHTNING ARE LIKELY. LIGHTNING CAN
KILL! TAKE COVER IN A SUBSTANTIAL SHELTER AND STAY AWAY FROM WINDOWS
UNTIL THE STORM PASSES.

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 3424 11644 3432 11647 3438 11640 3446 11640
      3447 11642 3450 11642 3451 11641 3452 11629
      3425 11628
TIME...MOT...LOC 2240Z 167DEG 6KT 3429 11642

$$

PIERCE
332 
WWUS55 KVEF 292300
SVSVEF

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE LAS VEGAS NV
400 PM PDT WED AUG 29 2012

CAC071-292308-
/O.EXP.KVEF.SV.W.0048.000000T0000Z-120829T2300Z/
SAN BERNARDINO CA-
400 PM PDT WED AUG 29 2012

...THE SEVERE THUNDERSTORM WARNING FOR SOUTH CENTRAL SAN BERNARDINO
COUNTY WILL EXPIRE AT 400 PM PDT...

THE THUNDERSTORM NEAR LANDERS IS WEAKENING. THE THREAT FOR STRONG 
WINDS OR HAIL HAS DIMINISHED. THE SEVERE THUNDERSTORM WARNING WILL 
EXPIRE AT 4 PM.

LAT...LON 3424 11644 3432 11647 3438 11640 3446 11640
      3447 11642 3450 11642 3451 11641 3452 11629
      3425 11628
TIME...MOT...LOC 2258Z 167DEG 6KT 3432 11643

$$

PIERCE

The office that day

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

IssuedProductOfficeCountiesLasted
Aug 29, 1:26 PM PDTSevere Thunderstorm WarningVEFSan Bernardino34 min
Aug 29, 3:38 PM PDTAreal Flood AdvisoryVEFSan Bernardino82 min
Aug 29, 4:19 PM PDTAreal Flood AdvisoryVEFSan Bernardino116 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.