Alert archive / California / Severe Thunderstorm Warnings in 2014

Severe Thunderstorm Warning 4, NWS Eureka, CA

July 22, 2014Trinity County, California

NWS Eureka, CA issued this severe thunderstorm warning at Jul 22, 2014, 5:18 PM PDT for Trinity County, California. It was in force for 27 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 22, 2014, 5:18 PM PDT (00:18 UTC)
Expired: Jul 22, 2014, 5:45 PM PDT
In force: 27 min
Issued by: NWS Eureka, CA
Area: Storm-based polygon

County Trinity County, CA

The radar

The Eureka (Bunker Hill) radar (KBHX), 119 km from the middle of the area, began a volume at 00:19 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 00:00Z, 0.3 hours before the alert went out and 205 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: 364 J/kg
Mixed-layer CIN: -139 J/kg
Mixed-layer LCL: 2336 m above ground
0-6 km bulk shear: 46 kt
0-1 km storm-relative helicity: 50 m²/s²
0-3 km storm-relative helicity: 118 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.4

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

582 
WUUS56 KEKA 230018
SVREKA
CAC105-230045-
/O.NEW.KEKA.SV.W.0004.140723T0018Z-140723T0045Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE EUREKA CA
518 PM PDT TUE JUL 22 2014

THE NATIONAL WEATHER SERVICE IN EUREKA HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  CENTRAL TRINITY COUNTY IN NORTHWEST CALIFORNIA...
  THIS INCLUDES THE CITY OF WEAVERVILLE...

* UNTIL 545 PM PDT

* AT 512 PM PDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A 
LINE OF SEVERE THUNDERSTORMS CAPABLE OF PRODUCING QUARTER SIZE 
HAIL...AND DAMAGING WINDS IN EXCESS OF 60 MPH.  THESE STORMS WERE 
LOCATED FROM 8 MILES SOUTH OF DOUGLAS CITY TO NEAR WEAVERVILLE AND 
MOVING NORTH AT 30 MPH.

* OTHER LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO
  LEWISTON.

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 4053 12278 4050 12280 4050 12283 4044 12290
      4044 12292 4042 12295 4041 12299 4039 12300
      4038 12304 4093 12297 4090 12266
TIME...MOT...LOC 0016Z 191DEG 25KT 4055 12290

$$

RPA

2 follow-up statements

368 
WWUS56 KEKA 230032
SVSEKA

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE EUREKA CA
532 PM PDT TUE JUL 22 2014

CAC105-230045-
/O.CON.KEKA.SV.W.0004.000000T0000Z-140723T0045Z/
TRINITY CA-
532 PM PDT TUE JUL 22 2014

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 545 PM PDT
FOR CENTRAL TRINITY COUNTY...

AT 530 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 NEAR DOUGLAS CITY...OR 11 MILES SOUTH OF WEAVERVILLE...MOVING
NORTH AT 30 MPH.

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

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 4070 12299 4069 12273 4053 12278 4050 12280
      4050 12283 4044 12290 4044 12292 4042 12295
      4041 12299 4039 12300 4038 12304
TIME...MOT...LOC 0032Z 191DEG 25KT 4058 12289

$$

RPA

185 
WWUS56 KEKA 230040
SVSEKA

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE EUREKA CA
540 PM PDT TUE JUL 22 2014

CAC105-230050-
/O.EXP.KEKA.SV.W.0004.000000T0000Z-140723T0045Z/
TRINITY CA-
540 PM PDT TUE JUL 22 2014

...THE SEVERE THUNDERSTORM WARNING FOR CENTRAL TRINITY COUNTY WILL
EXPIRE AT 545 PM PDT...

LAT...LON 4070 12299 4069 12273 4053 12278 4050 12280
      4050 12283 4044 12290 4044 12292 4042 12295
      4041 12299 4039 12300 4038 12304
TIME...MOT...LOC 0040Z 191DEG 25KT 4063 12287

$$

RPA

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 22, 5:07 PM PDT	Areal Flood Advisory	EKA	Trinity	113 min
Jul 22, 6:04 PM PDT	Flash Flood Warning	EKA	Trinity	116 min
Jul 22, 6:33 PM PDT	Special Weather Statement	EKA	Trinity	27 min
Jul 23, 2:22 AM PDT	Small Craft Advisory	EKA		3 days
Jul 23, 2:35 PM PDT	Gale Warning	EKA		48 hr

Nearby

Severe Thunderstorm Warnings in California, 2014 Every severe thunderstorm warning in 2014

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.