Alert archive / California / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 1, NWS Eureka, CA

March 31, 2012Del Norte County, California

NWS Eureka, CA issued this severe thunderstorm warning at Mar 31, 2012, 3:14 PM PDT for Del Norte County, California. It was in force for 16 min. 1 report came from inside the area while it was in force.

The area

The outline as issued, with what was reported inside it.

The facts

Issued: Mar 31, 2012, 3:14 PM PDT (22:14 UTC)
Expired: Mar 31, 2012, 3:30 PM PDT
In force: 16 min
Issued by: NWS Eureka, CA
Area: Storm-based polygon

County Del Norte County, CA

The radar

The Medford radar (KMAX), 120 km from the middle of the area, began a volume at 22:18 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.

What was reported inside it

Time	Report	Where	Remark
Mar 31, 3:20 PM PDT	TSTM WND GST 66	Crescent City, CA	CRESCENT CITY AIRPORT ASOS REPORTED A WIND GUST OF 66 MPH.

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The nearest sounding before it

Medford/Jackson, OR (KMFR), launched 12:00Z, 10.2 hours before the alert went out and 128 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: 1654 m above ground
0-6 km bulk shear: 110 kt
0-1 km storm-relative helicity: 349 m²/s²
0-3 km storm-relative helicity: 608 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.

215 
WUUS56 KEKA 312214
SVREKA
CAC015-312230-
/O.NEW.KEKA.SV.W.0001.120331T2214Z-120331T2230Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE
314 PM PDT SAT MAR 31 2012

THE NATIONAL WEATHER SERVICE HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  DEL NORTE COUNTY IN NORTHWEST CALIFORNIA...
  THIS INCLUDES THE CITY OF CRESCENT CITY...

* UNTIL 330 PM PDT

* AT 311 PM PDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  LINE OF SEVERE THUNDERSTORMS CAPABLE OF PRODUCING DAMAGING WINDS IN
  EXCESS OF 60 MPH.  THESE STORMS WERE LOCATED ALONG A LINE EXTENDING
  FROM 6 MILES NORTHWEST OF SMITH RIVER TO KLAMATH...OR ALONG A LINE
  EXTENDING FROM 7 MILES SOUTH OF BROOKINGS TO 13 MILES NORTH OF
  ORICK...AND MOVING NORTHEAST AT 60 MPH.

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

PRECAUTIONARY/PREPAREDNESS ACTIONS...

DAMAGING WINDS UP TO 68 MPH WERE REPORTED IN BROOKINGS WITH THIS 
STORM. THIS IS A DANGEROUS STORM...SEEK SAFE SHELTER AND STAY AWAY 
FROM WINDOWS!

&&

LAT...LON 4200 12400 4196 12398 4165 12389 4147 12403
      4147 12407 4151 12410 4160 12411 4166 12415
      4173 12417 4174 12422 4177 12427 4190 12421
      4201 12421
TIME...MOT...LOC 2214Z 211DEG 52KT 4200 12423 4151 12409

$$

BFG

2 follow-up statements

811 
WWUS56 KEKA 312224
SVSEKA

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE
324 PM PDT SAT MAR 31 2012

CAC015-312230-
/O.CON.KEKA.SV.W.0001.000000T0000Z-120331T2230Z/
DEL NORTE CA-
324 PM PDT SAT MAR 31 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 330 PM PDT
FOR DEL NORTE COUNTY...

AT 320 PM PDT...THE PUBLIC REPORTED A LINE OF SEVERE THUNDERSTORMS
CAPABLE OF PRODUCING DAMAGING WINDS IN EXCESS OF 60 MPH.  THESE
STORMS WERE LOCATED ALONG A LINE EXTENDING FROM 10 MILES NORTH OF
SMITH RIVER TO REQUA...OR ALONG A LINE EXTENDING FROM 7 MILES EAST OF
BROOKINGS TO 15 MILES SOUTHEAST OF CRESCENT CITY...MOVING NORTHEAST
AT 60 MPH.

OTHER LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO GASQUET

PRECAUTIONARY/PREPAREDNESS ACTIONS...

DAMAGING WINDS UP TO 68 MPH WERE REPORTED IN BROOKINGS WITH THIS 
STORM. THIS IS A DANGEROUS STORM...SEEK SAFE SHELTER AND STAY AWAY 
FROM WINDOWS!

&&

LAT...LON 4200 12400 4196 12398 4165 12389 4147 12403
      4147 12407 4151 12410 4160 12411 4166 12415
      4173 12417 4174 12422 4177 12427 4190 12421
      4201 12421
TIME...MOT...LOC 2223Z 211DEG 52KT 4211 12413 4162 12400

$$

BFG

968 
WWUS56 KEKA 312230
SVSEKA

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE
330 PM PDT SAT MAR 31 2012

CAC015-312241-
/O.EXP.KEKA.SV.W.0001.000000T0000Z-120331T2230Z/
DEL NORTE CA-
330 PM PDT SAT MAR 31 2012

...THE SEVERE THUNDERSTORM WARNING FOR DEL NORTE COUNTY HAS
EXPIRED...

LAT...LON 4200 12400 4196 12398 4165 12389 4147 12403
      4147 12407 4151 12410 4160 12411 4166 12415
      4173 12417 4174 12422 4177 12427 4190 12421
      4201 12421
TIME...MOT...LOC 2224Z 211DEG 52KT 4212 12411 4163 12399

$$

BFG

The office that day

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

Issued	Product	Office	Counties	Lasted
Mar 30, 5:11 PM PDT	Areal Flood Advisory	EKA	Del Norte, Humboldt	17 hr
Mar 30, 9:48 PM PDT	Hazardous Seas Warning	EKA		11 hr
Mar 31, 3:18 AM PDT	Winter Weather Advisory	EKA		20 hr
Mar 31, 2:46 PM PDT	Special Marine Warning	EKA		29 min
Mar 31, 2:52 PM PDT	Hazardous Seas Warning	EKA		24 hr
Mar 31, 2:52 PM PDT	Special Weather Statement	EKA	Del Norte, Humboldt	53 min
Mar 31, 3:20 PM PDT	Special Marine Warning	EKA		40 min
Mar 31, 3:27 PM PDT	Special Weather Statement	EKA	Humboldt	48 min
Mar 31, 3:30 PM PDT	Special Weather Statement	EKA	Humboldt, Mendocino	60 min
Mar 31, 4:00 PM PDT	Special Marine Warning	EKA		45 min
Mar 31, 4:23 PM PDT	Special Weather Statement	EKA	Humboldt	37 min
Mar 31, 4:31 PM PDT	Special Weather Statement	EKA	Mendocino	44 min
Mar 31, 4:38 PM PDT	Special Weather Statement	EKA		52 min
Mar 31, 4:41 PM PDT	Special Weather Statement	EKA	Humboldt	34 min

Nearby

Severe Thunderstorm Warnings in California, 2012 Every severe thunderstorm warning in 2012

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.