138 
WUUS56 KSTO 212229
SVRSTO
CAC063-091-212315-
/O.NEW.KSTO.SV.W.0037.260921T2229Z-260921T2315Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Sacramento CA
329 PM PDT Mon Sep 21 2026

The National Weather Service in Sacramento has issued a

* Severe Thunderstorm Warning for...
  Southern Plumas County in northern California...
  Western Sierra County in northern California...

* Until 415 PM PDT.

* At 329 PM PDT, a severe thunderstorm was located 7 miles southeast
  of Gibsonville, or 9 miles north of Downieville, moving south at 5
  mph.

  HAZARD...Quarter size hail.

  SOURCE...Radar indicated.

  IMPACT...Damage to vehicles is expected.

* Locations impacted include...
  Downieville, Gibsonville, Little Grass Valley and La Porte.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Seek shelter inside a well-built structure and stay away from
windows. This storm is capable of producing large hail.

&&

LAT...LON 3964 12100 3977 12098 3972 12072 3971 12072
      3969 12070 3968 12068 3954 12066 3957 12101
TIME...MOT...LOC 2228Z 7DEG 4KT 3969 12081

HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.00 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...<50 MPH

$$

Rowe

988 
WWUS56 KSTO 212259
SVSSTO

Severe Weather Statement
National Weather Service Sacramento CA
359 PM PDT Mon Sep 21 2026

CAC063-091-212309-
/O.CAN.KSTO.SV.W.0037.000000T0000Z-260921T2315Z/
Plumas CA-Sierra CA-
359 PM PDT Mon Sep 21 2026

...SEVERE THUNDERSTORM WARNING IS CANCELLED FOR SOUTHERN PLUMAS AND
WESTERN SIERRA COUNTIES...

The storm which prompted the warning has weakened below severe
limits, and no longer poses an immediate threat to life or property.
Therefore, the warning has been cancelled. However, gusty winds and
heavy rain are still possible with this thunderstorm.

&&

LAT...LON 3964 12100 3977 12098 3972 12072 3971 12072
      3969 12070 3968 12068 3954 12066 3957 12101
TIME...MOT...LOC 2229Z 7DEG 4KT 3969 12081

$$

Rowe