Alert archive / California / Severe Thunderstorm Warnings in 2009

Severe Thunderstorm Warning 2, NWS Eureka, CA

May 28, 2009Trinity County, California

NWS Eureka, CA issued this severe thunderstorm warning at May 28, 2009, 4:30 PM PDT for Trinity County, California. It was in force for 30 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: May 28, 2009, 4:30 PM PDT (23:30 UTC)
Expired: May 28, 2009, 5:00 PM PDT
In force: 30 min
Issued by: NWS Eureka, CA
Area: Storm-based polygon

County Trinity County, CA

The radar

The Eureka (Bunker Hill) radar (KBHX), 83 km from the middle of the area, began a volume at 23:34 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, 11.5 hours before the alert went out and 203 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: 1770 m above ground
0-6 km bulk shear: 12 kt
0-1 km storm-relative helicity: -19 m²/s²
0-3 km storm-relative helicity: 90 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.

000 
WWUS56 KEKA 290000
SVSEKA

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE EUREKA CA
400 PM PDT THU MAY 28 2009

CAC105-290007-
/O.EXP.KEKA.SV.W.0002.000000T0000Z-090529T0000Z/
TRINITY CA-
400 PM PDT THU MAY 28 2009

...THE SEVERE THUNDERSTORM WARNING FOR CENTRAL TRINITY COUNTY WILL
EXPIRE AT 500 PM PDT...

AT 455 PM...DOPPLER RADAR INDICATED THE THUNDERSTORM 3 MILES NW OF 
PEANUT THAT PROMPTED THE WARNING HAD WEAKENED. HOWEVER...THIS STORM 
IS STILL CAPABLE OF PRODUCING HEAVY RAIN AND SMALL HAIL. CAUTION 
SHOULD BE USED IF YOU PLAN TO BE OUTDOORS IN THE AREA.

LAT...LON 4064 12350 4076 12326 4048 12309 4041 12324
TIME...MOT...LOC 2357Z 151DEG 13KT 4065 12333

$$

BK/MB

1 follow-up statement

000 
WUUS56 KEKA 282330
SVREKA
CAC105-290000-
/O.NEW.KEKA.SV.W.0002.090528T2330Z-090529T0000Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE EUREKA CA
430 PM PDT THU MAY 28 2009

THE NATIONAL WEATHER SERVICE IN EUREKA HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  CENTRAL TRINITY COUNTY IN NORTHWEST CALIFORNIA...

* UNTIL 500 PM PDT

* AT 425 PM PDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING PENNY SIZE HAIL.  THIS
  STORM WAS LOCATED 7 MILES NORTHWEST OF PEANUT...OR 20 MILES        
  NORTHWEST OF YOLLA BOLLY DISTRICT RANGER STATION...AND MOVING      
  NORTHWEST AT 15 MPH.

* OTHER LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO
  HYAMPOM AND BIG BAR

PRECAUTIONARY/PREPAREDNESS ACTIONS...

THIS IS A DANGEROUS STORM. IF YOU ARE IN ITS PATH...PREPARE 
IMMEDIATELY FOR DAMAGING WINDS AND DESTRUCTIVE HAIL. PEOPLE OUTSIDE 
SHOULD MOVE TO A SHELTER...PREFERABLY INSIDE A STRONG BUILDING BUT 
AWAY FROM WINDOWS.

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 4064 12350 4076 12326 4048 12309 4041 12324
TIME...MOT...LOC 2329Z 151DEG 13KT 4056 12327

$$

BK/MB/CC

The office that day

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

Issued	Product	Office	Counties	Lasted
May 28, 3:38 PM PDT	Severe Thunderstorm Warning	EKA	Trinity	37 min

Nearby

Severe Thunderstorm Warnings in California, 2009 Every severe thunderstorm warning in 2009

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.