Alert archive / California / Severe Thunderstorm Warnings in 2004

Severe Thunderstorm Warning 13, NWS Las Vegas, NV

August 14, 2004San Bernardino County, California

NWS Las Vegas, NV issued this severe thunderstorm warning at Aug 14, 2004, 8:10 PM PDT for San Bernardino County, California. It was in force for 35 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 14, 2004, 8:10 PM PDT (03:10 UTC)
Expired
Aug 14, 2004, 8:45 PM PDT
In force
35 min
Issued by
NWS Las Vegas, NV
Area
Counties, with a storm outline in the text

County San Bernardino County, CA

The nearest sounding before it

San Diego, CA (KNKX), launched 00:00Z, 3.2 hours before the alert went out and 210 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 2004-08-15Temperature 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 2004-08-15The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -13 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
1358 m above ground
0-6 km bulk shear
6 kt
0-1 km storm-relative helicity
-13 m²/s²
0-3 km storm-relative helicity
-18 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.

000 
WUUS55 KVEF 150310
SVRVEF
CAC071-150400-

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE LAS VEGAS NV
810 PM PDT SAT AUG 14 2004

THE NATIONAL WEATHER SERVICE IN LAS VEGAS HAS ISSUED A

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

* UNTIL 845 PM PDT

* AT 807 PM 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 OVER   
  WEST CENTRAL SAN BERNARDINO COUNTY...ALONG HIGHWAY 395 25 MILES
  NORTH OF VICTORVILLE...MOVING SOUTH AT 15 MPH.

DOPPLER RADAR HAS INDICATED SOME WEAK ROTATION WITHIN THIS STORM. 
WHILE NOT IMMEDIATELY LIKELY...A TORNADO CAN DEVELOP FROM A SEVERE 
THUNDERSTORM. THIS IS A DANGEROUS STORM. ACT QUICKLY AND MOVE TO A 
PLACE OF SAFETY IN A STURDY STRUCTURE.

LAT...LON 3479 11736 3476 11757 3453 11753 3455 11727

$$

ADAIR

The office that day

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

IssuedProductOfficeCountiesLasted
Aug 14, 6:11 PM PDTSevere Thunderstorm WarningVEFSan Bernardino34 min
Aug 14, 6:23 PM PDTFlash Flood WarningVEFSan Bernardino28 days
Aug 15, 3:16 AM PDTFlash Flood WarningVEFInyo, San Bernardino28 days
Aug 15, 11:04 AM PDTSevere Thunderstorm WarningVEFSan Bernardino41 min
Aug 15, 11:14 AM PDTFlash Flood WarningVEFSan Bernardino27 days
Aug 15, 12:15 PM PDTFlash Flood WarningVEFInyo, San Bernardino27 days
Aug 15, 1:28 PM PDTSevere Thunderstorm WarningVEFSan Bernardino47 min
Aug 15, 1:33 PM PDTSevere Thunderstorm WarningVEFSan Bernardino42 min
Aug 15, 3:07 PM PDTFlash Flood WarningVEFSan Bernardino113 min

Nearby

Severe Thunderstorm Warnings in California, 2004Every severe thunderstorm warning in 2004

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.