Alert archive / California / Special Weather Statements in 2017

Special Weather Statement, NWS Eureka, CA

August 8, 2017Trinity County, California

NWS Eureka, CA issued this special weather statement at Aug 8, 2017, 4:12 PM PDT for Trinity County, California. It was in force for 33 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: Aug 8, 2017, 4:12 PM PDT (23:12 UTC)
Expired: Aug 8, 2017, 4:45 PM PDT
In force: 33 min
Issued by: NWS Eureka, CA

County Trinity County, CA

The radar

The Eureka (Bunker Hill) radar (KBHX), 87 km from the middle of the area, began a volume at 23:12 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, 11.2 hours before the alert went out and 223 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: 77 J/kg
Mixed-layer CIN: -482 J/kg
Mixed-layer LCL: 1734 m above ground
0-6 km bulk shear: 2 kt
0-1 km storm-relative helicity: -3 m²/s²
0-3 km storm-relative helicity: 42 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

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What forecasters said that day

The local office's own words before this special weather statement went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Eureka, CA wrote its last area forecast discussion before this special weather statement went out at Aug 8, 4:08 AM PDT, 12 hours 4 minutes earlier.

Area forecast discussion, Aug 8, 4:08 AM PDT, 12 hours 4 minutes before

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Hazardous weather outlook, Aug 8, 3:41 AM PDT, 12 hours 31 minutes before

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In the hours before

Special weather statement, Aug 8, 3:22 PM PDT, 50 minutes before

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Special weather statement, Aug 8, 3:34 PM PDT, 38 minutes before

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Special weather statement, Aug 8, 3:49 PM PDT, 23 minutes before

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Special weather statement, Aug 8, 3:58 PM PDT, 14 minutes before

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Special weather statement, Aug 8, 4:12 PM PDT, 0 minutes before

Special Weather Statement
National Weather Service Eureka CA
412 PM PDT TUE AUG 8 2017

CAZ108-082345-
Southern Trinity-
412 PM PDT TUE AUG 8 2017

...A STRONG THUNDERSTORM WILL AFFECT SOUTHWESTERN TRINITY COUNTY...

At 412 PM PDT, a strong thunderstorm was located near Forest Glen, or
13 miles southwest of Hayfork. the storm is nearly stationary.

Winds in excess of 30 mph and pea size hail are possible with this
storm.

Locations impacted include...
Hayfork, Ruth and Forest Glen.

Frequent cloud to ground lightning is occurring with this storm.
Lightning can strike 10 miles away from a thunderstorm. Seek a safe
shelter inside a building or vehicle.

This storm may intensify, so be certain to monitor local radio
stations and available television stations for additional information
and possible warnings from the National Weather Service.

LAT...LON 4050 12318 4029 12319 4025 12327 4027 12341
      4042 12336 4051 12331
TIME...MOT...LOC 2312Z 043DEG 4KT 4041 12327

JMG/RCL

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 7, 5:04 PM PDT	Special Weather Statement	EKA		11 min
Aug 7, 5:16 PM PDT	Special Weather Statement	EKA	Trinity	29 min
Aug 7, 5:25 PM PDT	Special Weather Statement	EKA	Trinity	35 min
Aug 7, 5:37 PM PDT	Special Weather Statement	EKA	Trinity	23 min
Aug 7, 5:55 PM PDT	Special Weather Statement	EKA	Trinity	35 min
Aug 7, 6:27 PM PDT	Special Weather Statement	EKA		33 min
Aug 7, 8:15 PM PDT	Fire Weather Watch	EKA		7 hr
Aug 8, 3:22 AM PDT	Red Flag Warning	EKA		17 hr
Aug 8, 3:22 PM PDT	Special Weather Statement	EKA	Trinity	23 min
Aug 8, 3:34 PM PDT	Special Weather Statement	EKA		26 min
Aug 8, 3:49 PM PDT	Special Weather Statement	EKA	Trinity	26 min
Aug 8, 3:52 PM PDT	Red Flag Warning	EKA		28 hr
Aug 8, 3:58 PM PDT	Special Weather Statement	EKA		32 min
Aug 8, 4:35 PM PDT	Special Weather Statement	EKA	Glenn	25 min
Aug 8, 4:42 PM PDT	Special Weather Statement	EKA	Trinity	18 min

Nearby

Special Weather Statements in California, 2017 Every special weather statement in 2017

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.