Alert archive / California / Special Weather Statements in 2017

Special Weather Statement, NWS Eureka, CA

August 10, 2017Trinity County, California

NWS Eureka, CA issued this special weather statement at Aug 10, 2017, 5:12 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 10, 2017, 5:12 PM PDT (00:12 UTC)
Expired
Aug 10, 2017, 5:45 PM PDT
In force
33 min
Issued by
NWS Eureka, CA

County Trinity County, CA

The radar

The Eureka (Bunker Hill) radar (KBHX), 94 km from the middle of the area, began a volume at 00:13 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 00:00Z, 0.2 hours before the alert went out and 229 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-pSkew-T log-p diagram, Medford/Jackson, OR at 00:00Z on 2017-08-11Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 241 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Medford/Jackson, OR at 00:00Z on 2017-08-11The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 21 square meters per square second.1939Sfc1 km3 km6 km9 kmRMLM
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
241 J/kg
Mixed-layer CIN
-89 J/kg
Mixed-layer LCL
3346 m above ground
0-6 km bulk shear
17 kt
0-1 km storm-relative helicity
21 m²/s²
0-3 km storm-relative helicity
52 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted.

499 
WWUS86 KEKA 110012
SPSEKA

Special Weather Statement
National Weather Service Eureka CA
512 PM PDT THU AUG 10 2017
 
CAZ108-110045-
Southern Trinity CA-
512 PM PDT THU AUG 10 2017

...SIGNIFICANT WEATHER ADVISORY FOR SOUTH CENTRAL TRINITY COUNTY
UNTIL 545 PM PDT...

At 512 PM PDT, Doppler radar was tracking a strong thunderstorm 7
miles south of Peanut, or 9 miles west of Yolla Bolly District Rs,
moving east at 10 mph.

Nickel size hail and winds in excess of 30 mph will be possible with
this storm.

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

LAT...LON 4021 12332 4052 12332 4052 12303 4029 12309
      4023 12315
TIME...MOT...LOC 0012Z 274DEG 9KT 4036 12315 

$$

GARNER

Nearby

Special Weather Statements in California, 2017Every 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.