Alert archive / California / Severe Thunderstorm Warnings in 2013

Severe Thunderstorm Warning 1, NWS Eureka, CA

July 3, 2013Trinity County, California

NWS Eureka, CA issued this severe thunderstorm warning at Jul 3, 2013, 2:21 PM PDT for Trinity County, California. It was in force for 24 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, 2:21 PM PDT (21:21 UTC)
Expired: Jul 3, 2013, 2:45 PM PDT
In force: 24 min
Issued by: NWS Eureka, CA
Area: Storm-based polygon

County Trinity County, CA

The radar

The Eureka (Bunker Hill) radar (KBHX), 121 km from the middle of the area, began a volume at 21:23 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, 9.4 hours before the alert went out and 256 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.

654 
WUUS56 KEKA 032121
SVREKA
CAC105-032145-
/O.NEW.KEKA.SV.W.0001.130703T2121Z-130703T2145Z/

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

THE NATIONAL WEATHER SERVICE HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  EXTREME SOUTHEASTERN TRINITY COUNTY IN NORTHWEST CALIFORNIA...

* UNTIL 245 PM PDT

* AT 219 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 18 MILES SOUTH OF YOLLA BOLLY DISTRICT RS. THIS
  STORM WAS NEARLY STATIONARY.

* 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 3997 12296 3998 12300 4008 12315 4026 12299
      4024 12297 4015 12298 4011 12295 4007 12296
      4006 12295 4000 12295 3999 12293
TIME...MOT...LOC 2121Z 198DEG 2KT 4010 12299

$$

RPA

1 follow-up statement

629 
WWUS56 KEKA 032135
SVSEKA

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE
235 PM PDT WED JUL 3 2013

CAC105-032145-
/O.CON.KEKA.SV.W.0001.000000T0000Z-130703T2145Z/
TRINITY CA-
235 PM PDT WED JUL 3 2013

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 245 PM PDT 
FOR EXTREME SOUTHEASTERN TRINITY COUNTY...

AT 228 PM PDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO
INDICATE 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 18 MILES SOUTH OF YOLLA BOLLY
DISTRICT RS. THIS STORM WAS NEARLY STATIONARY.

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

LAT...LON 3999 12293 3997 12295 3998 12300 4010 12308
      4025 12299 4024 12297 4015 12298 4010 12295
      4008 12296 4006 12295 4000 12295
TIME...MOT...LOC 2135Z 198DEG 2KT 4011 12299

$$

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, 2:31 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, 3:28 PM PDT	Severe Thunderstorm Warning	EKA	Trinity	32 min
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.