Alert archive / California / Severe Thunderstorm Warnings in 2009

Severe Thunderstorm Warning 7, NWS Eureka, CA

June 2, 2009Mendocino County, California

NWS Eureka, CA issued this severe thunderstorm warning at Jun 2, 2009, 6:32 PM PDT for Mendocino County, California. It was in force for 28 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: Jun 2, 2009, 6:32 PM PDT (01:32 UTC)
Expired: Jun 2, 2009, 7:00 PM PDT
In force: 28 min
Issued by: NWS Eureka, CA
Area: Storm-based polygon

County Mendocino County, CA

The radar

The Eureka (Bunker Hill) radar (KBHX), 112 km from the middle of the area, began a volume at 01:34 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

Oakland, CA (KOAK), launched 00:00Z, 1.5 hours before the alert went out and 255 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: 8 J/kg
Mixed-layer CIN: -294 J/kg
Mixed-layer LCL: 1069 m above ground
0-6 km bulk shear: 38 kt
0-1 km storm-relative helicity: 18 m²/s²
0-3 km storm-relative helicity: 124 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 030132
SVREKA
CAC045-030200-
/O.NEW.KEKA.SV.W.0007.090603T0132Z-090603T0200Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE
632 PM PDT TUE JUN 2 2009

THE NATIONAL WEATHER SERVICE HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  MENDOCINO COUNTY IN NORTHWEST CALIFORNIA...
  THIS INCLUDES THE CITY OF COVELO...

* UNTIL 700 PM PDT

* AT 629 PM PDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING QUARTER SIZE HAIL.  THIS
  STORM WAS LOCATED NEAR COVELO...AND MOVING NORTHWEST AT 10 MPH.

* THE SEVERE THUNDERSTORM WILL BE NEAR...
  RURAL MENDOCINO COUNTY AT 650 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 3976 12323 3991 12345 3998 12329 3998 12323
      3983 12312
TIME...MOT...LOC 0131Z 143DEG 7KT 3982 12320

$$

TH

1 follow-up statement

000 
WWUS56 KEKA 030155
SVSEKA

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE
655 PM PDT TUE JUN 2 2009

CAC045-030204-
/O.EXP.KEKA.SV.W.0007.000000T0000Z-090603T0200Z/
MENDOCINO CA-
655 PM PDT TUE JUN 2 2009

...THE SEVERE THUNDERSTORM WARNING FOR MENDOCINO COUNTY WILL EXPIRE
AT 700 PM PDT...

THE THUNDERSTORM NW OF COVELO HAS WEAKENED AND IS NO LONGER EXPECTED 
TO PRODUCE LARGE HAIL OR DAMAGING WINDS. THUNDERSTORM ACTIVITY WILL 
CONTINUE THROUGH TONIGHT.
 
LAT...LON 3976 12323 3991 12345 3998 12329 3998 12323       3983 
12312
TIME...MOT...LOC 0154Z 133DEG 15KT 3993 12334

$$

TH

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, 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, 3:21 PM PDT	Severe Thunderstorm Warning	EKA	Humboldt, Trinity	24 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.