Alert archive / California / Severe Thunderstorm Warnings in 1998

Severe Thunderstorm Warning 72, NWS Phoenix, AZ

August 16, 1998Imperial County, California

NWS Phoenix, AZ issued this severe thunderstorm warning at Aug 16, 1998, 5:36 PM PDT for Imperial County, California. It was in force for 64 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
Aug 16, 1998, 5:36 PM PDT (00:36 UTC)
Expired
Aug 16, 1998, 6:40 PM PDT
In force
64 min
Issued by
NWS Phoenix, AZ
Area
Whole counties

County Imperial County, CA

The nearest sounding before it

San Diego, CA (KNKX), launched 00:00Z, 0.6 hours before the alert went out and 173 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 1998-08-17Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1 joules per kilogram.LCLLFCEL10008507005003002001001 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 1998-08-17The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 8 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
1 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
1283 m above ground
0-6 km bulk shear
13 kt
0-1 km storm-relative helicity
8 m²/s²
0-3 km storm-relative helicity
-28 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 
TTAA00 KPHX 170037 RRA
SVRPHX
CAC025-170140-

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE PHOENIX AZ
536 PM MST (536 PM PDT) SUN AUG 16 1998

THE NATIONAL WEATHER SERVICE IN PHOENIX HAS ISSUED A

*  SEVERE THUNDERSTORM WARNING FOR
   IMPERIAL COUNTY IN SOUTHEASTERN CALIFORNIA

*  UNTIL 640 PM PDT (640 PM MST)

*  AT 535 PM PDT DOPPLER RADAR INDICATED SEVERAL SEVERE
   THUNDERSTORMS DEVELOPING IN THE IMPERIAL VALLEY OF CALIFORNIA.
   MOVEMENT WAS THE NORTH AT LESS THAN 10 MPH.

*  SOME LOCATIONS AFFECTED INCLUDE
   IMPERIAL VALLEY

DAMAGING WINDS IN EXCESS OF 60 MPH AND HAIL GREATER THAN 3/4 OF
AN INCH IN DIAMETER ARE LIKELY WITH THESE STORMS.

KOCH

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.