Alert archive / California / Severe Thunderstorm Warnings in 2009

Severe Thunderstorm Warning 8, NWS Eureka, CA

June 3, 2009Humboldt County, Trinity County, California

NWS Eureka, CA issued this severe thunderstorm warning at Jun 3, 2009, 3:21 PM PDT for Humboldt County, Trinity County, California. It was in force for 24 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: Jun 3, 2009, 3:21 PM PDT (22:21 UTC)
Expired: Jun 3, 2009, 3:45 PM PDT
In force: 24 min
Issued by: NWS Eureka, CA
Area: Storm-based polygon

Counties Humboldt County, CA, Trinity County, CA

The radar

The Eureka (Bunker Hill) radar (KBHX), 66 km from the middle of the area, began a volume at 22:21 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
Jun 3, 3:55 PM PDT	HAIL 1.75	Hyampom, CA	AT THE HYAMPOM GENERAL STORE. SEVERE THUNDERSTORM WITHRAIN. 1/2 HAIL IN THE VALLEY. GOLF SIZE HAIL ON THE MOUNTAIN.

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, 10.4 hours before the alert went out and 211 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: 1 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 873 m above ground
0-6 km bulk shear: 20 kt
0-1 km storm-relative helicity: 26 m²/s²
0-3 km storm-relative helicity: 75 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 
WUUS56 KEKA 032221
SVREKA
CAC023-105-032245-
/O.NEW.KEKA.SV.W.0008.090603T2221Z-090603T2245Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE EUREKA CA
321 PM PDT WED JUN 3 2009

THE NATIONAL WEATHER SERVICE IN EUREKA HAS ISSUED A

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

* UNTIL 345 PM PDT

* AT 320 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 12
  MILES SOUTH OF HYAMPOM...OR 24 MILES WEST OF YOLLA BOLLY DISTRICT
  RS...AND MOVING NORTHWEST AT 20 MPH.

* THE SEVERE THUNDERSTORM WILL BE NEAR...
  HYAMPOM BY 345 PM PDT...

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 4063 12370 4074 12344 4041 12325 4033 12346
TIME...MOT...LOC 2221Z 155DEG 16KT 4046 12341

$$

BC

2 follow-up statements

000 
WWUS56 KEKA 032237
SVSEKA

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE EUREKA CA
337 PM PDT WED JUN 3 2009

CAC023-105-032245-
/O.CON.KEKA.SV.W.0008.000000T0000Z-090603T2245Z/
TRINITY CA-HUMBOLDT CA-
337 PM PDT WED JUN 3 2009

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 345 PM PDT
FOR EAST CENTRAL HUMBOLDT AND WEST CENTRAL TRINITY COUNTIES...

AT 336 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 7 MILES SOUTH OF HYAMPOM...OR 28 MILES NORTHWEST OF YOLLA
BOLLY DISTRICT RS...MOVING NORTHWEST AT 20 MPH.

THE SEVERE THUNDERSTORM WILL BE NEAR...
  HYAMPOM BY 345 PM PDT...

LAT...LON 4047 12335 4046 12338 4043 12350 4062 12369
      4063 12370 4074 12344
TIME...MOT...LOC 2237Z 155DEG 16KT 4052 12345

$$

BC

000 
WWUS56 KEKA 032239
SVSEKA

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE EUREKA CA
339 PM PDT WED JUN 3 2009

CAC023-105-032245-
/O.CON.KEKA.SV.W.0008.000000T0000Z-090603T2245Z/
TRINITY CA-HUMBOLDT CA-
339 PM PDT WED JUN 3 2009

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 345 PM PDT
FOR EAST CENTRAL HUMBOLDT AND WEST CENTRAL TRINITY COUNTIES...

AT 337 PM PDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO
INDICATE A SEVERE THUNDERSTORM CAPABLE OF PRODUCING QUARTER SIZE
HAIL.  THIS STORM WAS LOCATED 7 MILES SOUTH OF HYAMPOM...OR 28 MILES
NORTHWEST OF YOLLA BOLLY DISTRICT RS...MOVING NORTHWEST AT 20 MPH.

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

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 4063 12370 4074 12344 4041 12325 4033 12346
TIME...MOT...LOC 2238Z 155DEG 16KT 4053 12345

$$

BK

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 2, 6:15 PM PDT	Special Weather Statement	EKA	Mendocino	45 min
Jun 2, 6:32 PM PDT	Severe Thunderstorm Warning	EKA	Mendocino	28 min
Jun 2, 7:15 PM PDT	Special Weather Statement	EKA	Siskiyou	45 min
Jun 3, 2:43 PM PDT	Areal Flood Advisory	EKA	Mendocino	3 hr
Jun 3, 2:47 PM PDT	Special Weather Statement	EKA	Trinity	43 min
Jun 3, 3:04 PM PDT	Special Weather Statement	EKA		56 min
Jun 3, 3:28 PM PDT	Severe Thunderstorm Warning	EKA	Mendocino, Trinity	32 min
Jun 3, 3:44 PM PDT	Severe Thunderstorm Warning	EKA	Humboldt, Trinity	46 min
Jun 3, 3:51 PM PDT	Special Weather Statement	EKA	Humboldt	39 min
Jun 3, 4:00 PM PDT	Severe Thunderstorm Warning	EKA	Mendocino	18 min
Jun 3, 4:05 PM PDT	Severe Thunderstorm Warning	EKA	Trinity	25 min
Jun 3, 4:20 PM PDT	Severe Thunderstorm Warning	EKA	Humboldt	25 min
Jun 3, 4:26 PM PDT	Special Weather Statement	EKA	Humboldt	19 min
Jun 3, 4:36 PM PDT	Special Weather Statement	EKA	Mendocino	24 min
Jun 3, 4:42 PM PDT	Special Weather Statement	EKA	Mendocino	33 min
Jun 3, 4:47 PM PDT	Severe Thunderstorm Warning	EKA	Humboldt, Trinity	13 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.