Alert archive / California / Severe Thunderstorm Warnings in 2013

Severe Thunderstorm Warning 3, NWS Eureka, CA

July 3, 2013Trinity County, California

NWS Eureka, CA issued this severe thunderstorm warning at Jul 3, 2013, 3:28 PM PDT for Trinity County, California. It was in force for 32 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: Jul 3, 2013, 3:28 PM PDT (22:28 UTC)
Expired: Jul 3, 2013, 4:00 PM PDT
In force: 32 min
Issued by: NWS Eureka, CA
Area: Storm-based polygon

County Trinity County, CA

The radar

The Eureka (Bunker Hill) radar (KBHX), 108 km from the middle of the area, began a volume at 22:28 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 246 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: 86 J/kg
Mixed-layer CIN: -543 J/kg
Mixed-layer LCL: 1565 m above ground
0-6 km bulk shear: 16 kt
0-1 km storm-relative helicity: -20 m²/s²
0-3 km storm-relative helicity: 53 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.

305 
WUUS56 KEKA 032228
SVREKA
CAC105-032300-
/O.NEW.KEKA.SV.W.0003.130703T2228Z-130703T2300Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE EUREKA CA
328 PM PDT WED JUL 3 2013

THE NATIONAL WEATHER SERVICE HAS ISSUED A

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

* UNTIL 400 PM PDT

* AT 323 PM PDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING QUARTER SIZE HAIL...AND
  DAMAGING WINDS IN EXCESS OF 60 MPH.  THIS STORM WAS LOCATED OVER
  TRINITY COUNTY...OR 15 MILES SOUTHWEST OF YOLLA BOLLY DISTRICT
  RS...AND MOVING NORTHWEST AT 5 MPH.

* THE SEVERE THUNDERSTORM WILL OTHERWISE REMAIN OVER MAINLY RURAL
  AREAS OF THE INDICATED COUNTY.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

THIS IS A DANGEROUS STORM. IF YOU ARE IN ITS PATH...PREPARE
IMMEDIATELY FOR DAMAGING WINDS...DESTRUCTIVE HAIL...AND DEADLY CLOUD
TO GROUND LIGHTNING. PEOPLE OUTSIDE SHOULD MOVE TO A SHELTER...
PREFERABLY INSIDE A STRONG BUILDING BUT AWAY FROM WINDOWS.

&&

LAT...LON 4003 12308 4013 12326 4024 12324 4036 12316
      4022 12296 4018 12298 4014 12297
TIME...MOT...LOC 2228Z 128DEG 6KT 4018 12309

$$

RPA

1 follow-up statement

888 
WWUS56 KEKA 032251
SVSEKA

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE EUREKA CA
351 PM PDT WED JUL 3 2013

CAC105-032300-
/O.CAN.KEKA.SV.W.0003.000000T0000Z-130703T2300Z/
TRINITY CA-
351 PM PDT WED JUL 3 2013

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHERN TRINITY COUNTY IS 
CANCELLED...

THE SEVERE THUNDERSTORM HAS WEAKENED. WIND GUSTS TO 40 MPH...CLOUD 
TO GROUND LIGHTNING AND HEAVY RAINFALL CAN STILL BE EXPECTED THROUGH 
4 PM.

LAT...LON 4003 12308 4013 12326 4024 12324 4036 12316
      4022 12296 4018 12298 4014 12297
TIME...MOT...LOC 2250Z 128DEG 6KT 4020 12313

$$

RPA

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 3, 2:03 PM PDT	Special Weather Statement	EKA		42 min
Jul 3, 2:09 PM PDT	Special Weather Statement	EKA		51 min
Jul 3, 2:21 PM PDT	Severe Thunderstorm Warning	EKA	Trinity	24 min
Jul 3, 2:31 PM PDT	Hazardous Seas Warning	EKA		4 days
Jul 3, 2:45 PM PDT	Severe Thunderstorm Warning	EKA	Trinity	45 min
Jul 3, 2:49 PM PDT	Areal Flood Advisory	EKA	Trinity	3 hr
Jul 3, 3:48 PM PDT	Special Weather Statement	EKA		57 min
Jul 3, 4:03 PM PDT	Severe Thunderstorm Warning	EKA	Mendocino	42 min
Jul 3, 4:40 PM PDT	Special Weather Statement	EKA	Trinity	50 min
Jul 3, 4:50 PM PDT	Special Weather Statement	EKA	Trinity	40 min

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.