Alert archive / California / Severe Thunderstorm Warnings in 2003

Severe Thunderstorm Warning 12, NWS Eureka, CA

September 4, 2003Trinity County, California

NWS Eureka, CA issued this severe thunderstorm warning at Sep 4, 2003, 5:30 PM PDT for Trinity County, California. It was in force for 45 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
Sep 4, 2003, 5:30 PM PDT (00:30 UTC)
Expired
Sep 4, 2003, 6:15 PM PDT
In force
45 min
Issued by
NWS Eureka, CA
Area
Counties, with a storm outline in the text

County Trinity County, CA

The radar

The Eureka (Bunker Hill) radar (KBHX), 114 km from the middle of the area, began a volume at 00:34 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 00:00Z, 0.5 hours before the alert went out and 238 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 00:00Z on 2003-09-05Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 63 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, Medford/Jackson, OR at 00:00Z on 2003-09-05The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 4 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
63 J/kg
Mixed-layer CIN
-231 J/kg
Mixed-layer LCL
3057 m above ground
0-6 km bulk shear
23 kt
0-1 km storm-relative helicity
4 m²/s²
0-3 km storm-relative helicity
32 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 050030
SVREKA
CAC105-050115-

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE EUREKA CA
530 PM PDT THU SEP 4 2003

THE NATIONAL WEATHER SERVICE IN EUREKA HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  SOUTHEAST TRINITY COUNTY IN NORTHWEST CALIFORNIA

* UNTIL 615 PM PDT

* AT 529 PM PDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUES   
  TO INDICATE A SEVERE THUNDERSTORM OVER SOUTHEAST TRINITY           
  COUNTY...OR ABOUT 12 MILES SOUTHEAST OF FOREST GLEN. THE STORM WAS
  MOVING TO THE NORTH AT 10 MPH. 

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 4018 12319 4005 12303 4030 12266 4046 12287

$$

MC/MJV

The office that day

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

IssuedProductOfficeCountiesLasted
Sep 4, 5:06 PM PDTSevere Thunderstorm WarningEKATrinity24 min

Nearby

Severe Thunderstorm Warnings in California, 2003Every severe thunderstorm warning in 2003

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.