Alert archive / California / Severe Thunderstorm Warnings in 1997

Severe Thunderstorm Warning 2, NWS Eureka, CA

June 9, 1997Humboldt County, Mendocino County, Trinity County, California

NWS Eureka, CA issued this severe thunderstorm warning at Jun 9, 1997, 1:55 PM PDT for Humboldt County, Mendocino County, Trinity County, California. It was in force for 55 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
Jun 9, 1997, 1:55 PM PDT (20:55 UTC)
Expired
Jun 9, 1997, 2:50 PM PDT
In force
55 min
Issued by
NWS Eureka, CA
Area
Whole counties

Counties Humboldt County, CA, Mendocino County, CA, Trinity County, CA

The radar

The Eureka (Bunker Hill) radar (KBHX), 73 km from the middle of the area, began a volume at 20:54 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

Medford/Jackson, OR (KMFR), launched 12:00Z, 8.9 hours before the alert went out and 241 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, Medford/Jackson, OR at 12:00Z on 1997-06-09Temperature 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, Medford/Jackson, OR at 12:00Z on 1997-06-09The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 23 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
1018 m above ground
0-6 km bulk shear
4 kt
0-1 km storm-relative helicity
23 m²/s²
0-3 km storm-relative helicity
17 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 KEKA 092057
SVREKA
CAC023-045-105-092200-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING...CORRECTED
NATIONAL WEATHER SERVICE EUREKA CA
155 PM PDT MON JUN 9 1997

THE NATIONAL WEATHER SERVICE HAS ISSUED A SEVERE THUNDERSTORM WARNING
EFFECTIVE UNTIL 250 PM FOR THE FOLLOWING LOCATIONS...

IN NORTHWEST CALIFORNIA
  ...SOUTHWEST TRINITY...NORTHEAST MENDOCINO...EXTREME SOUTHERN
HUMBOLDT COUNTY...
     INCLUDING AREAS NORTHEAST OF LEGGETT

DOPPL|ER WEATHER RADAR INDICATED LARGE HAIL...GREATER THAN ONE
INCH...WITH A THUNDERSTORM LOCATED 15 MILES NORTHEAST OF LEGGETT.
THE STORM WAS MOVING SOUTHWEST AT 10 MPH.

SEEK SHELTER IN A STRONG BUILDING...BUT STAY AWAY FROM WINDOWS.

The office that day

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

IssuedProductOfficeCountiesLasted
Jun 9, 1:20 PM PDTSevere Thunderstorm WarningEKATrinity30 min

Nearby

Severe Thunderstorm Warnings in California, 1997Every severe thunderstorm warning in 1997

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.