Alert archive / California / Severe Thunderstorm Warnings in 2013

Severe Thunderstorm Warning 4, NWS Eureka, CA

July 3, 2013Mendocino County, California

NWS Eureka, CA issued this severe thunderstorm warning at Jul 3, 2013, 4:03 PM PDT for Mendocino County, California. It was in force for 42 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, 4:03 PM PDT (23:03 UTC)
Expired: Jul 3, 2013, 4:45 PM PDT
In force: 42 min
Issued by: NWS Eureka, CA
Area: Storm-based polygon

County Mendocino County, CA

The radar

The Eureka (Bunker Hill) radar (KBHX), 126 km from the middle of the area, began a volume at 23:03 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

Oakland, CA (KOAK), launched 12:00Z, 11.1 hours before the alert went out and 253 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 1239 m above ground
0-6 km bulk shear: 21 kt
0-1 km storm-relative helicity: 23 m²/s²
0-3 km storm-relative helicity: 35 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.

691 
WUUS56 KEKA 032303
SVREKA
CAC045-032345-
/O.NEW.KEKA.SV.W.0004.130703T2303Z-130703T2345Z/

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

THE NATIONAL WEATHER SERVICE HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  NORTHEASTERN MENDOCINO COUNTY IN NORTHWEST CALIFORNIA...

* UNTIL 445 PM PDT

* AT 359 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
  MENDOCINO COUNTY...OR 14 MILES NORTHEAST OF COVELO...AND MOVING
  SOUTHWEST AT 10 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 3990 12294 3986 12295 3975 12314 3998 12329
      3998 12308 3998 12300 3991 12292
TIME...MOT...LOC 2303Z 061DEG 7KT 3992 12306

$$

RPA

2 follow-up statements

443 
WWUS56 KEKA 032319
SVSEKA

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

CAC045-032345-
/O.CON.KEKA.SV.W.0004.000000T0000Z-130703T2345Z/
MENDOCINO CA-
419 PM PDT WED JUL 3 2013

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 445 PM PDT 
FOR NORTHEASTERN MENDOCINO COUNTY...

AT 416 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 MENDOCINO COUNTY...OR 14 MILES NORTHEAST OF COVELO...
MOVING WEST AT 5 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 3993 12299 3988 12300 3989 12323 3998 12329
      3998 12308 3998 12300
TIME...MOT...LOC 2318Z 085DEG 6KT 3995 12309

$$

RPA

069 
WWUS56 KEKA 032324
SVSEKA

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

CAC045-032334-
/O.CAN.KEKA.SV.W.0004.000000T0000Z-130703T2345Z/
MENDOCINO CA-
424 PM PDT WED JUL 3 2013

...THE SEVERE THUNDERSTORM WARNING FOR NORTHEASTERN MENDOCINO COUNTY 
IS CANCELLED...

THE THUNDERSTORM HAS WEAKENED.

LAT...LON 3993 12299 3988 12300 3989 12323 3998 12329
      3998 12308 3998 12300
TIME...MOT...LOC 2324Z 085DEG 6KT 3995 12310

$$

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, 3:28 PM PDT	Severe Thunderstorm Warning	EKA	Trinity	32 min
Jul 3, 3:48 PM PDT	Special Weather Statement	EKA		57 min
Jul 3, 4:40 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.