Alert archive / California / Severe Thunderstorm Warnings in 2001

Severe Thunderstorm Warning 4, NWS Eureka, CA

July 11, 2001Trinity County, California

NWS Eureka, CA issued this severe thunderstorm warning at Jul 11, 2001, 1:48 PM PDT for Trinity County, California. It was in force for 42 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline the Iowa Environmental Mesonet reconstructed for it; the warning itself named whole counties.

The facts

Issued: Jul 11, 2001, 1:48 PM PDT (20:48 UTC)
Expired: Jul 11, 2001, 2:30 PM PDT
In force: 42 min
Issued by: NWS Eureka, CA
Area: Whole counties; the outline is the Mesonet’s reconstruction

County Trinity County, CA

The nearest sounding before it

Medford/Jackson, OR (KMFR), launched 12:00Z, 8.8 hours before the alert went out and 179 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-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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: 7 J/kg
Mixed-layer CIN: -453 J/kg
Mixed-layer LCL: 1260 m above ground
0-6 km bulk shear: 12 kt
0-1 km storm-relative helicity: 40 m²/s²
0-3 km storm-relative helicity: 68 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 
WUUS56 KEKA 112049
SVREKA

CAC105-112130-

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE EUREKA CA
148 PM PDT WED JUL 11 2001

THE NATIONAL WEATHER SERVICE IN EUREKA HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  WEST CENTRAL TRINITY COUNTY IN NORTHWEST CALIFORNIA

* UNTIL 230 PM PDT

* AT 145 PM PDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM OVER DEL LOMA...OR ABOUT 19 MILES SOUTHEAST OF
  WILLOW CREEK...MOVING NORTHEAST AT 20 MPH.

* THE SEVERE THUNDERSTORM WILL BE NEAR...
RURAL CENTRAL TRINITY COUNTY AT 200 PM PDT
RURAL NORTHERN TRINITY COUNTY AT 220 PM PDT
DENNY IN NORTHERN TRINITY COUNTY BY 220 PM PDT

VERY LARGE HAIL IS POSSIBLE WITH THIS SEVERE THUNDERSTORM. IF YOU ARE
IN THE PATH OF THE STORM...PUT YOUR CAR IN A GARAGE AND MOVE TO A
SUBSTANTIAL SHELTER.

THIS IS A DANGEROUS STORM. IF YOU ARE IN ITS PATH YOU SHOULD PREPARE
FOR DAMAGING WINDS IN EXCESS OF 55 MPH...LARGE HAIL...AND DEADLY
LIGHTNING. PEOPLE OUTSIDE SHOULD MOVE TO A SHELTER...PREFERABLY
INSIDE A STRONG BUILDING BUT AWAY FROM WINDOWS.

REPORT SEVERE WEATHER TO THE NEAREST LAW ENFORCEMENT AGENCY. THEY
WILL RELAY YOUR REPORT TO THE NATIONAL WEATHER SERVICE FORECAST
OFFICE IN EUREKA.

LAT...LON 4077 12350 4068 12323 4091 12316 4095 12344

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 11, 1:22 PM PDT	Severe Thunderstorm Warning	EKA	Trinity	23 min
Jul 11, 2:34 PM PDT	Severe Thunderstorm Warning	EKA	Humboldt, Trinity	41 min
Jul 11, 3:14 PM PDT	Severe Thunderstorm Warning	EKA	Humboldt, Trinity	46 min

Nearby

Severe Thunderstorm Warnings in California, 2001 Every severe thunderstorm warning in 2001

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.