Alert archive / California / Severe Thunderstorm Warnings in 2002

Severe Thunderstorm Warning 21, NWS Sacramento, CA

July 21, 2002Plumas County, California

NWS Sacramento, CA issued this severe thunderstorm warning at Jul 21, 2002, 3:26 PM PDT for Plumas County, California. It was in force for 49 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
Jul 21, 2002, 3:26 PM PDT (22:26 UTC)
Expired
Jul 21, 2002, 4:15 PM PDT
In force
49 min
Issued by
NWS Sacramento, CA
Area
Counties, with a storm outline in the text

County Plumas County, CA

The nearest sounding before it

Reno, NV (KREV), launched 12:00Z, 10.4 hours before the alert went out and 256 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 2002-07-21Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 469 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, Reno, NV at 12:00Z on 2002-07-21The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 27 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
469 J/kg
Mixed-layer CIN
-196 J/kg
Mixed-layer LCL
2216 m above ground
0-6 km bulk shear
15 kt
0-1 km storm-relative helicity
27 m²/s²
0-3 km storm-relative helicity
79 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 KSTO 212226
SVRSTO
CAC063-212300-

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE SACRAMENTO CA
326 PM PDT SUN JUL 21 2002

THE NATIONAL WEATHER SERVICE HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  WESTERN PLUMAS COUNTY IN CALIFORNIA
 
* VALID UNTIL 415 PM PDT

* AT 312 PM PDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED   
  SEVERAL STRONG STORMS NORTH OF QUINCY...MOVING NORTHWEST AT 5 TO   
  10 MPH TOWARDS CHESTER. THESE STORMS ARE CAPABLE OF PRODUCING 
  LARGE HAIL AND POSSIBLY DAMAGING WINDS.   

* SOME LOCATIONS AFFECTED BY THIS WARNING INCLUDE...
  CHESTER
  

LAT...LON 3988 12113 3999 12077 4044 12106 4044 12149

JHM

The office that day

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

IssuedProductOfficeCountiesLasted
Jul 21, 3:30 PM PDTSevere Thunderstorm WarningSTOPlumas45 min
Jul 21, 4:16 PM PDTSevere Thunderstorm WarningSTOPlumas, Shasta, Tehama44 min

Nearby

Severe Thunderstorm Warnings in California, 2002Every severe thunderstorm warning in 2002

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.