Alert archive / California / Severe Thunderstorm Warnings in 2013

Severe Thunderstorm Warning 7, NWS Eureka, CA

August 9, 2013Trinity County, California

NWS Eureka, CA issued this severe thunderstorm warning at Aug 9, 2013, 3:46 PM PDT for Trinity County, California. It was in force for 29 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, 3:46 PM PDT (22:46 UTC)
Expired: Aug 9, 2013, 4:15 PM PDT
In force: 29 min
Issued by: NWS Eureka, CA
Area: Storm-based polygon

County Trinity County, CA

The radar

The Eureka (Bunker Hill) radar (KBHX), 79 km from the middle of the area, began a volume at 22:46 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, 10.8 hours before the alert went out and 193 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.

382 
WUUS56 KEKA 092246
SVREKA
CAC105-092315-
/O.NEW.KEKA.SV.W.0007.130809T2246Z-130809T2315Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE EUREKA CA
346 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 338 PM PDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING QUARTER SIZE HAIL.  THIS
  STORM WAS LOCATED NEAR HYAMPOM...OR 25 MILES WEST OF WEAVERVILLE...
  AND MOVING NORTH AT 10 MPH.

* THE SEVERE THUNDERSTORM WILL BE NEAR...
  7 MILES SOUTHWEST OF DEL LOMA AND 9 MILES SOUTHEAST OF BURNT RANCH
  BY 415 PM PDT...

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 4057 12327 4051 12347 4080 12356 4085 12345
      4083 12332
TIME...MOT...LOC 2246Z 171DEG 8KT 4064 12339

$$
CARROLL

2 follow-up statements

161 
WWUS56 KEKA 092304
SVSEKA

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

CAC105-092315-
/O.CON.KEKA.SV.W.0007.000000T0000Z-130809T2315Z/
TRINITY CA-
404 PM PDT FRI AUG 9 2013

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 415 PM PDT
FOR WEST CENTRAL TRINITY COUNTY...

AT 355 PM PDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO
INDICATE A SEVERE THUNDERSTORM CAPABLE OF PRODUCING QUARTER SIZE 
HAIL ALONG WITH WIND GUSTS OVER 40 MPH. THIS STORM WAS LOCATED NEAR 
HYAMPOM...OR 23 MILES SOUTHEAST OF WILLOW CREEK...DRIFTING NORTH 
AT 5 MPH.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

IN ADDITION TO LARGE HAIL AND 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 4079 12343 4075 12331 4057 12327 4051 12347
      4073 12354
TIME...MOT...LOC 2303Z 171DEG 8KT 4068 12340

$$

CARROLL

801 
WWUS56 KEKA 092316
SVSEKA

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

CAC105-092326-
/O.EXP.KEKA.SV.W.0007.000000T0000Z-130809T2315Z/
TRINITY CA-
416 PM PDT FRI AUG 9 2013

...THE SEVERE THUNDERSTORM WARNING FOR WEST CENTRAL TRINITY COUNTY
HAS EXPIRED...

RESIDENTS SHOULD REMAIN ALERT FOR MORE THUNDERSTORM DEVELOPMENT THIS 
AFTERNOON AND EVENING.

LAT...LON 4079 12343 4075 12331 4057 12327 4051 12347
      4073 12354
TIME...MOT...LOC 2304Z 171DEG 8KT 4068 12340

$$

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, 3:32 PM PDT	Severe Thunderstorm Warning	EKA	Trinity	43 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.