Alert archive / California / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 3, NWS San Diego, CA

July 14, 2012San Bernardino County, California

NWS San Diego, CA issued this severe thunderstorm warning at Jul 14, 2012, 5:30 PM PDT for San Bernardino County, California. It was in force for 45 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
Jul 14, 2012, 5:30 PM PDT (00:30 UTC)
Expired
Jul 14, 2012, 6:15 PM PDT
In force
45 min
Issued by
NWS San Diego, CA
Area
Storm-based polygon

County San Bernardino County, CA

The nearest sounding before it

San Diego, CA (KNKX), launched 00:00Z, 0.5 hours before the alert went out and 217 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 00:00Z on 2012-07-15Temperature 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 00:00Z on 2012-07-15The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 2 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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
1935 m above ground
0-6 km bulk shear
16 kt
0-1 km storm-relative helicity
2 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.

114 
WUUS56 KSGX 150030
SVRSGX
CAC071-150115-
/O.NEW.KSGX.SV.W.0003.120715T0030Z-120715T0115Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE SAN DIEGO CA
530 PM PDT SAT JUL 14 2012

THE NATIONAL WEATHER SERVICE IN SAN DIEGO HAS ISSUED A

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

* UNTIL 615 PM PDT.

* AT 524 PM PDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING QUARTER SIZE HAIL.  THIS
  STORM WAS LOCATED OVER CENTRAL SAN BERNARDINO COUNTY...OR 10 MILES 
  SOUTHEAST OF DAGGETT...AND NEARLY STATIONARY. THE STORM HAS A      
  HISTORY OF PRODUCING STRONG WINDS AND HEAVY RAIN. WINDS OF 44 MPH  
  WERE REPORTED AT DAGGETT.

* THE SEVERE THUNDERSTORM WILL OTHERWISE IMPACT MAINLY RURAL AREAS OF
  THE INDICATED COUNTY.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

IN ADDITION TO LARGE HAIL AND DAMAGING WINDS...CONTINUOUS CLOUD TO
GROUND LIGHTNING IS OCCURRING WITH THIS STORM. MOVE INDOORS
IMMEDIATELY! LIGHTNING IS ONE OF NATURES NUMBER ONE KILLERS.
REMEMBER...IF YOU CAN HEAR THUNDER...YOU ARE CLOSE ENOUGH TO BE
STRUCK BY LIGHTNING.

&&

LAT...LON 3477 11698 3477 11683 3476 11683 3477 11677
      3475 11661 3457 11673 3462 11709 3478 11700
TIME...MOT...LOC 0029Z 173DEG 5KT 3477 11676

$$

PG
2 follow-up statements
662 
WWUS56 KSGX 150053
SVSSGX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE SAN DIEGO CA
553 PM PDT SAT JUL 14 2012

CAC071-150115-
/O.CON.KSGX.SV.W.0003.000000T0000Z-120715T0115Z/
SAN BERNARDINO CA-
553 PM PDT SAT JUL 14 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 615 PM PDT
FOR CENTRAL SAN BERNARDINO COUNTY...

AT 548 PM PDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO
INDICATE A SEVERE THUNDERSTORM CAPABLE OF PRODUCING QUARTER SIZE
HAIL.  THIS STORM WAS LOCATED OVER CENTRAL SAN BERNARDINO COUNTY...OR
8 MILES SOUTHEAST OF DAGGETT. THE STORM IS NEARLY STATIONARY.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

IN ADDITION TO LARGE HAIL...HEAVY RAIN AND DAMAGING WINDS...FREQUENT 
CLOUD TO GROUND LIGHTNING IS OCCURRING WITH THIS STORM. MOVE INDOORS 
IMMEDIATELY! LIGHTNING IS ONE OF NATURES NUMBER ONE KILLERS. 
REMEMBER...IF YOU CAN HEAR THUNDER...YOU ARE CLOSE ENOUGH TO BE 
STRUCK BY LIGHTNING.

&&

LAT...LON 3477 11698 3477 11683 3476 11683 3477 11677
      3475 11661 3457 11673 3462 11709 3478 11700
TIME...MOT...LOC 0051Z 173DEG 5KT 3480 11676

$$

PG
176 
WWUS56 KSGX 150110
SVSSGX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE SAN DIEGO CA
610 PM PDT SAT JUL 14 2012

CAC071-150119-
/O.EXP.KSGX.SV.W.0003.000000T0000Z-120715T0115Z/
SAN BERNARDINO CA-
610 PM PDT SAT JUL 14 2012

...THE SEVERE THUNDERSTORM WARNING FOR CENTRAL SAN BERNARDINO COUNTY
WILL EXPIRE AT 615 PM PDT...

THE THUNDERSTORM HAS DISSIPATED...AND THE SEVERE THUNDERSTORM 
WARNING WILL BE ALLOWED TO EXPIRE AT 615 PM PDT.

LAT...LON 3477 11698 3477 11683 3476 11683 3477 11677
      3475 11661 3457 11673 3462 11709 3478 11700
TIME...MOT...LOC 0109Z 173DEG 5KT 3482 11676

$$

JJT/PALMER

The office that day

Everything else NWS San Diego, CA issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Jul 15, 4:16 PM PDTSevere Thunderstorm WarningSGXSan Bernardino44 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.