Alert archive / California / Special Weather Statements in 2012

Special Weather Statement, NWS Sacramento, CA

August 4, 2012El Dorado County, California

NWS Sacramento, CA issued this special weather statement at Aug 4, 2012, 4:21 PM PDT for El Dorado County, California. It was in force for 54 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 4, 2012, 4:21 PM PDT (23:21 UTC)
Expired
Aug 4, 2012, 5:15 PM PDT
In force
54 min
Issued by
NWS Sacramento, CA

County El Dorado County, CA

The radar

The Reno radar (KRGX), 117 km from the middle of the area, began a volume at 23:24 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

Reno, NV (KREV), launched 12:00Z, 11.4 hours before the alert went out and 190 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, Reno, NV at 12:00Z on 2012-08-04Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 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, Reno, NV at 12:00Z on 2012-08-04The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 35 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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
3561 m above ground
0-6 km bulk shear
13 kt
0-1 km storm-relative helicity
35 m²/s²
0-3 km storm-relative helicity
22 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.

230 
WWUS86 KSTO 042321
SPSSTO

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE SACRAMENTO CA
421 PM PDT SAT AUG 4 2012

CAZ069-050015-
EL DORADO CA-PLACER CA-AMADOR CA-
421 PM PDT SAT AUG 4 2012

THE NATIONAL WEATHER SERVICE IN SACRAMENTO HAS ISSUED A

SIGNIFICANT WEATHER ADVISORY FOR...
  EXTREME NORTHEASTERN AMADOR COUNTY IN CENTRAL CALIFORNIA
  EAST CENTRAL PLACER COUNTY IN CENTRAL CALIFORNIA
  EASTERN EL DORADO COUNTY IN CENTRAL CALIFORNIA

UNTIL 515 PM PDT

AT 418 PM PDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
STRONG THUNDERSTORM NEAR SIERRA AT TAHOE..MOVING NORTHWEST AT 20 MPH.

HAIL UP TO THE SIZE OF PENNIES AND WIND GUSTS UP TO 40 MPH ARE
EXPECTED WITH THIS STORM...ALONG WITH FREQUENT DANGEROUS LIGHTNING.

LOCATIONS IMPACTED INCLUDE...
   TWIN BRIDGES...
   KYBURZ...

LAT...LON 3859 12029 3893 12059 3912 12025 3907 12020
      3904 12021 3903 12019 3886 12015 3882 12004
      3876 11999
TIME...MOT...LOC 2320Z 137DEG 16KT 3881 12009

$$

CS

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.