Alert archive / California / Severe Thunderstorm Warnings in 2004

Severe Thunderstorm Warning 2, NWS San Francisco Bay Area, CA

February 27, 2004Alameda County, California

NWS San Francisco Bay Area, CA issued this severe thunderstorm warning at Feb 27, 2004, 7:20 PM PST for Alameda County, California. It was in force for 25 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
Feb 27, 2004, 7:20 PM PST (03:20 UTC)
Expired
Feb 27, 2004, 7:45 PM PST
In force
25 min
Issued by
NWS San Francisco Bay Area, CA
Area
Counties, with a storm outline in the text

County Alameda County, CA

The radar

The San Francisco radar (KMUX), 57 km from the middle of the area, began a volume at 03:21 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

Oakland, CA (KOAK), launched 00:00Z, 3.3 hours before the alert went out and 33 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, Oakland, CA at 00:00Z on 2004-02-28Temperature 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, Oakland, CA at 00:00Z on 2004-02-28The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 1 square meters per square second.1939587897Sfc1 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
1165 m above ground
0-6 km bulk shear
48 kt
0-1 km storm-relative helicity
1 m²/s²
0-3 km storm-relative helicity
47 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.

545 
WUUS56 KMTR 280320
SVRMTR
CAC001-280345-

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE SAN FRANCISCO CA
719 PM PST FRI FEB 27 2004

THE NATIONAL WEATHER SERVICE IN SAN FRANCISCO BAY AREA HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  EASTERN ALAMEDA COUNTY IN CALIFORNIA
  THIS INCLUDES THE CITIES OF...PLEASANTON...LIVERMORE...DUBLIN   

* UNTIL 745 PM PST

* AT 715 PM PST...SHERIFF OFFICE REPORTED A SEVERE THUNDERSTORM      
  2 MILES NORTHEAST OF PLEASANTON...MOVING SOUTH AT 25 MPH.

HAIL UP TO DIME SIZE HAS BEEN REPORTED WITH THIS STORM. IF YOU ARE 
IN THE PATH OF THE STORM...PUT YOUR CAR IN A GARAGE AND MOVE TO A 
SUBSTANTIAL SHELTER.

REPORT SEVERE WEATHER TO THE NEAREST LAW ENFORCEMENT AGENCY. THEY
WILL RELAY YOUR REPORT TO THE NATIONAL WEATHER SERVICE OFFICE IN SAN
FRANCISCO BAY AREA.

LAT...LON 3778 12177 3776 12199 3750 12196 3751 12168

$$
STROBIN/DYKEMA

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; radar from the NEXRAD Level II archive.