Alert archive / California / Severe Thunderstorm Warnings in 2013

Severe Thunderstorm Warning 6, NWS Eureka, CA

August 9, 2013Trinity County, California

NWS Eureka, CA issued this severe thunderstorm warning at Aug 9, 2013, 3:32 PM PDT for Trinity County, California. It was in force for 43 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: Aug 9, 2013, 3:32 PM PDT (22:32 UTC)
Expired: Aug 9, 2013, 4:15 PM PDT
In force: 43 min
Issued by: NWS Eureka, CA
Area: Storm-based polygon

County Trinity County, CA

The radar

The Eureka (Bunker Hill) radar (KBHX), 80 km from the middle of the area, began a volume at 22:34 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 12:00Z, 10.5 hours before the alert went out and 227 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: 3 J/kg
Mixed-layer CIN: -341 J/kg
Mixed-layer LCL: 1211 m above ground
0-6 km bulk shear: 18 kt
0-1 km storm-relative helicity: -7 m²/s²
0-3 km storm-relative helicity: 18 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.

148 
WUUS56 KEKA 092232
SVREKA
CAC105-092315-
/O.NEW.KEKA.SV.W.0006.130809T2232Z-130809T2315Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE EUREKA CA
332 PM PDT FRI AUG 9 2013

THE NATIONAL WEATHER SERVICE IN EUREKA HAS ISSUED A

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

* UNTIL 415 PM PDT

* AT 326 PM PDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING QUARTER SIZE HAIL. THIS
  STORM MAY ALSO PRODUCE WIND GUSTS IN EXCESS OF 40 MPH. THIS
  STORM WAS LOCATED NEAR FOREST GLEN...OR 19 MILES WEST OF YOLLA
  BOLLY DISTRICT RS...AND DRIFTING NORTHWEST AT 5 MPH. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

IN ADDITION TO LARGE HAIL AND DAMAGING WINDS...CONTINUOUS CLOUD TO
GROUND LIGHTNING IS OCCURRING WITH THIS STORM. MOVE INDOORS
IMMEDIATELY! LIGHTNING IS ONE OF NATURES NUMBER ONE KILLERS.
REMEMBER...IF YOU CAN HEAR THUNDER...YOU ARE CLOSE ENOUGH TO BE
STRUCK BY LIGHTNING.

&&

LAT...LON 4048 12354 4057 12327 4030 12316 4019 12326
      4022 12338
TIME...MOT...LOC 2231Z 157DEG 4KT 4038 12333

$$

CARROLL

1 follow-up statement

804 
WWUS56 KEKA 092249
SVSEKA

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE EUREKA CA
349 PM PDT FRI AUG 9 2013

CAC105-092258-
/O.CAN.KEKA.SV.W.0006.000000T0000Z-130809T2315Z/
TRINITY CA-
349 PM PDT FRI AUG 9 2013

...THE SOUTHERNMOST SEVERE THUNDERSTORM WARNING FOR WEST CENTRAL 
TRINITY COUNTY INCLUDING FOREST GLEN AND RUTH IS CANCELLED...

LAT...LON 4048 12354 4057 12327 4030 12316 4019 12326
      4022 12338
TIME...MOT...LOC 2248Z 157DEG 4KT 4040 12334

$$

CARROLL

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 8, 5:49 PM PDT	Areal Flood Advisory	EKA	Trinity	3 hr
Aug 9, 2:02 AM PDT	Red Flag Warning	EKA		21 hr
Aug 9, 2:16 PM PDT	Special Weather Statement	EKA	Trinity	29 min
Aug 9, 2:40 PM PDT	Special Weather Statement	EKA	Mendocino	35 min
Aug 9, 3:11 PM PDT	Special Weather Statement	EKA	Trinity	49 min
Aug 9, 3:23 PM PDT	Special Weather Statement	EKA	Mendocino	52 min
Aug 9, 3:46 PM PDT	Severe Thunderstorm Warning	EKA	Trinity	29 min
Aug 9, 4:09 PM PDT	Special Weather Statement	EKA		36 min
Aug 9, 4:23 PM PDT	Special Weather Statement	EKA	Trinity	37 min
Aug 9, 4:29 PM PDT	Severe Thunderstorm Warning	EKA	Trinity	46 min
Aug 9, 4:53 PM PDT	Areal Flood Advisory	EKA	Trinity	3 hr

Nearby

Severe Thunderstorm Warnings in California, 2013 Every severe thunderstorm warning in 2013

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.