Alert archive / California / Severe Thunderstorm Warnings in 2011

Severe Thunderstorm Warning 7, NWS San Diego, CA

July 30, 2011San Bernardino County, California

NWS San Diego, CA issued this severe thunderstorm warning at Jul 30, 2011, 2:13 PM PDT for San Bernardino County, California. It was in force for 32 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 30, 2011, 2:13 PM PDT (21:13 UTC)
Expired
Jul 30, 2011, 2:45 PM PDT
In force
32 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 12:00Z, 9.2 hours before the alert went out and 218 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 2011-07-30Temperature 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°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, San Diego, CA at 12:00Z on 2011-07-30The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 0 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
657 m above ground
0-6 km bulk shear
13 kt
0-1 km storm-relative helicity
0 m²/s²
0-3 km storm-relative helicity
44 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.

865 
WUUS56 KSGX 302113
SVRSGX
CAC071-302145-
/O.NEW.KSGX.SV.W.0007.110730T2113Z-110730T2145Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE SAN DIEGO CA
213 PM PDT SAT JUL 30 2011

THE NATIONAL WEATHER SERVICE IN SAN DIEGO HAS ISSUED A

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

* UNTIL 245 PM PDT

* AT 200 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 NEAR HELENDALE...OR 11 MILES
  NORTH OF APPLE VALLEY...AND MOVING NORTHWEST AT 10 MPH. THIS STORM
  HAS A HISTORY OF WINDS NEAR 60 MPH AND HALF INCH HAIL.

* THE SEVERE THUNDERSTORM WILL BE NEAR...
  HELENDALE BY 235 PM PDT...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

THIS IS A DANGEROUS STORM. IF YOU ARE IN ITS PATH...PREPARE
IMMEDIATELY FOR DAMAGING WINDS...DESTRUCTIVE HAIL...AND DEADLY CLOUD
TO GROUND LIGHTNING. PEOPLE OUTSIDE SHOULD MOVE TO A SHELTER...
PREFERABLY INSIDE A STRONG BUILDING BUT AWAY FROM WINDOWS.

&&

LAT...LON 3482 11759 3480 11721 3479 11718 3471 11714
      3457 11728 3462 11751 3482 11767 3483 11766
TIME...MOT...LOC 2112Z 129DEG 7KT 3470 11729

$$

TARDY
1 follow-up statement
123 
WWUS56 KSGX 302146
SVSSGX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE SAN DIEGO CA
246 PM PDT SAT JUL 30 2011

CAC071-302156-
/O.EXP.KSGX.SV.W.0007.000000T0000Z-110730T2145Z/
SAN BERNARDINO CA-
246 PM PDT SAT JUL 30 2011

...THE SEVERE THUNDERSTORM WARNING FOR WEST CENTRAL SAN BERNARDINO
COUNTY HAS EXPIRED...

THE SEVERE THUNDERSTORM HAS MOVED JUST NORTH OF HELENDALE.

LAT...LON 3482 11759 3480 11721 3479 11718 3471 11714
      3457 11728 3462 11751 3482 11767 3483 11766
TIME...MOT...LOC 2113Z 129DEG 7KT 3470 11729

$$
TARDY

The office that day

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

IssuedProductOfficeCountiesLasted
Jul 30, 2:53 AM PDTFlash Flood WatchSGXRiverside, San Bernardino, San Diego17 hr
Jul 30, 12:33 PM PDTFlash Flood WarningSGXSan Bernardino2 hr
Jul 30, 12:58 PM PDTSevere Thunderstorm WarningSGXSan Bernardino32 min
Jul 30, 1:26 PM PDTAreal Flood AdvisorySGXSan Bernardino2 hr
Jul 30, 1:39 PM PDTFlash Flood WarningSGXSan Bernardino96 min
Jul 30, 1:41 PM PDTSevere Thunderstorm WarningSGXSan Bernardino49 min
Jul 30, 2:30 PM PDTFlash Flood WarningSGXSan Bernardino2 hr
Jul 30, 3:34 PM PDTAreal Flood AdvisorySGXSan Bernardino116 min
Jul 30, 3:46 PM PDTAreal Flood AdvisorySGXSan Diego119 min

Nearby

Severe Thunderstorm Warnings in California, 2011Every severe thunderstorm warning in 2011

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.