Alert archive / California / Special Weather Statements in 2012

Special Weather Statement, NWS Eureka, CA

August 5, 2012Trinity County, California

NWS Eureka, CA issued this special weather statement at Aug 5, 2012, 5:47 PM PDT for Trinity County, California. It was in force for 43 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 5, 2012, 5:47 PM PDT (00:47 UTC)
Expired
Aug 5, 2012, 6:30 PM PDT
In force
43 min
Issued by
NWS Eureka, CA

County Trinity County, CA

The radar

The Eureka (Bunker Hill) radar (KBHX), 104 km from the middle of the area, began a volume at 00:46 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, 0.8 hours before the alert went out and 156 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 2012-08-06Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 265 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 2012-08-06The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -9 square meters per square second.193958Sfc1 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
265 J/kg
Mixed-layer CIN
-182 J/kg
Mixed-layer LCL
2963 m above ground
0-6 km bulk shear
23 kt
0-1 km storm-relative helicity
-9 m²/s²
0-3 km storm-relative helicity
94 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.

182 
WWUS86 KEKA 060047
SPSEKA

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE
547 PM PDT SUN AUG 5 2012

CAZ004-060130-
TRINITY CA-
547 PM PDT SUN AUG 5 2012

THE NATIONAL WEATHER SERVICE IN EUREKA HAS ISSUED A

SIGNIFICANT WEATHER ADVISORY FOR...
  TRINITY COUNTY IN NORTHWEST CALIFORNIA

UNTIL 630 PM PDT

AT 545 PM PDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A 
STRONG AREA OF THUNDERSTORMS OVER NORTHWESTERN TRINITY 
COUNTY...MOVING NORTH AT 15 MPH.

DIME SIZE HAIL IS EXPECTED WITH THIS STORM....ALONG WITH HEAVY RAIN 
AND LOCALIZED FLOODING. OCCASIONAL CLOUD TO GROUND LIGHTNING IS 
POSSIBLE AS WELL.

LOCATIONS IMPACTED INCLUDE...
  RURAL NORTHERN TRINITY COUNTY...
  RURAL NORTHWESTERN TRINITY COUNTY...

LAT...LON 4070 12323 4071 12338 4117 12340 4116 12338
      4117 12335 4115 12330 4108 12324 4109 12314
      4108 12311 4106 12308
TIME...MOT...LOC 0045Z 192DEG 16KT 4096 12326

$$

BFG

The office that day

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

IssuedProductOfficeCountiesLasted
Aug 5, 5:02 PM PDTSpecial Weather StatementEKATrinity43 min
Aug 5, 5:17 PM PDTAreal Flood AdvisoryEKATrinity67 min
Aug 5, 5:22 PM PDTAreal Flood AdvisoryEKATrinity62 min

Nearby

Special Weather Statements in California, 2012Every special weather statement in 2012

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.