Alert archive / California / Severe Thunderstorm Warnings in 1998

Severe Thunderstorm Warning 4, NWS San Francisco Bay Area, CA

September 3, 1998San Benito County, California

NWS San Francisco Bay Area, CA issued this severe thunderstorm warning at Sep 3, 1998, 5:10 PM PDT for San Benito County, California. It was in force for 110 min. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued
Sep 3, 1998, 5:10 PM PDT (00:10 UTC)
Expired
Sep 3, 1998, 7:00 PM PDT
In force
110 min
Issued by
NWS San Francisco Bay Area, CA
Area
Whole counties

County San Benito County, CA

The nearest sounding before it

Oakland, CA (KOAK), launched 00:00Z, 0.2 hours before the alert went out and 160 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 1998-09-04Temperature 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 1998-09-04The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -42 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
2751 m above ground
0-6 km bulk shear
16 kt
0-1 km storm-relative helicity
-42 m²/s²
0-3 km storm-relative helicity
4 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.

743 
WUUS1 KSFO 040115
SVRSFO
CAC069-040200-

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE SAN FRANCISCO CA
510 PM PDT THU SEP 3 1998

THE NATIONAL WEATHER SERVICE IN SAN FRANCISCO HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  EAST CENTRAL AND SOUTHEASTERN SAN BENITO COUNTY IN CENTRAL
  CALIFORNIA

* UNTIL 700 PM PDT

* AT 455 PM PDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM 10 MILES W OF PANOCHE...MOVING NW 15 MPH.


STRONG WINDS AND LARGE HAIL ARE LIKELY.

W PI

The office that day

Everything else NWS San Francisco Bay Area, CA issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Sep 3, 6:12 PM PDTSevere Thunderstorm WarningMTRSan Benito53 min

Nearby

Severe Thunderstorm Warnings in California, 1998Every severe thunderstorm warning in 1998

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.