Alert archive / California / Severe Thunderstorm Warnings in 2013

Severe Thunderstorm Warning 2, NWS Eureka, CA

July 3, 2013Trinity County, California

NWS Eureka, CA issued this severe thunderstorm warning at Jul 3, 2013, 2:45 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: Jul 3, 2013, 2:45 PM PDT (21:45 UTC)
Expired: Jul 3, 2013, 3:30 PM PDT
In force: 45 min
Issued by: NWS Eureka, CA
Area: Storm-based polygon

County Trinity County, CA

The radar

The Eureka (Bunker Hill) radar (KBHX), 116 km from the middle of the area, began a volume at 21:48 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, 9.8 hours before the alert went out and 248 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.

647 
WUUS56 KEKA 032145
SVREKA
CAC105-032230-
/O.NEW.KEKA.SV.W.0002.130703T2145Z-130703T2230Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE EUREKA CA
245 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 330 PM PDT

* AT 244 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 16 MILES SOUTH OF YOLLA BOLLY DISTRICT RS...AND
  MOVING NORTH 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 4001 12295 4002 12312 4029 12312 4028 12306
      4027 12305 4027 12302 4024 12297 4015 12298
      4011 12295 4007 12296 4006 12295
TIME...MOT...LOC 2145Z 183DEG 5KT 4013 12300

$$

RPA

1 follow-up statement

102 
WWUS56 KEKA 032159
SVSEKA

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

CAC105-032230-
/O.CON.KEKA.SV.W.0002.000000T0000Z-130703T2230Z/
TRINITY CA-
259 PM PDT WED JUL 3 2013

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 330 PM PDT 
FOR EXTREME SOUTHEASTERN TRINITY COUNTY...

AT 257 PM PDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO 
INDICATE A SEVERE THUNDERSTORM CAPABLE OF PRODUCING PING PONG BALL 
SIZE HAIL...AND DAMAGING WINDS IN EXCESS OF 60 MPH.  THIS STORM WAS 
LOCATED OVER TRINITY COUNTY...OR 15 MILES SOUTH OF YOLLA BOLLY 
DISTRICT RS...MOVING NORTH 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 4001 12295 4002 12312 4029 12312 4028 12306
      4027 12305 4027 12302 4024 12297 4015 12298
      4011 12295 4007 12296 4006 12295
TIME...MOT...LOC 2158Z 183DEG 5KT 4015 12300

$$

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, 2:49 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.