Alert archive / California / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 3, NWS Reno, NV

June 23, 2021Lassen County, California

NWS Reno, NV issued this severe thunderstorm warning at Jun 23, 2021, 4:03 PM PDT for Lassen County, California. It was in force for 42 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: Jun 23, 2021, 4:03 PM PDT (23:03 UTC)
Expired: Jun 23, 2021, 4:45 PM PDT
In force: 42 min
Issued by: NWS Reno, NV
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

County Lassen County, CA

The radar

The Beale AFB radar (KBBX), 163 km from the middle of the area, began a volume at 23:03 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 12:00Z, 11.1 hours before the alert went out and 211 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-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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: 1648 m above ground
0-6 km bulk shear: 21 kt
0-1 km storm-relative helicity: 23 m²/s²
0-3 km storm-relative helicity: 12 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

112 
WUUS55 KREV 232303
SVRREV
CAC035-232345-
/O.NEW.KREV.SV.W.0003.210623T2303Z-210623T2345Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Reno NV
403 PM PDT Wed Jun 23 2021

The National Weather Service in Reno has issued a

* Severe Thunderstorm Warning for...
  Northwestern Lassen County in northern California...

* Until 445 PM PDT.

* At 401 PM PDT, a severe thunderstorm was located 12 miles north of
  Crater Lake Campground, or 20 miles northwest of Eagle Lake, moving
  northwest at 15 mph.

  HAZARD...60 mph wind gusts and quarter size hail.

  SOURCE...Radar indicated.

  IMPACT...Hail damage to vehicles is expected. Expect wind damage 
           to roofs, siding, fencing and trees.

* Locations impacted include...
  Pittville and Ca 299 At Shasta-Lassen Co Line. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

For your protection move to an interior room on the lowest floor of a
building.

Remember, lightning can strike out to 15 miles from the parent 
thunderstorm. If you can hear thunder, you are close enough to be 
struck by lightning. Move to safe shelter now!  Do not be caught on 
the water in a thunderstorm.

&&

LAT...LON 4114 12133 4089 12102 4080 12096 4073 12104
      4079 12132
TIME...MOT...LOC 2301Z 134DEG 11KT 4080 12109 

HAIL...1.00IN
WIND...60MPH
 
$$

aky

1 follow-up statement

439 
WWUS55 KREV 232330
SVSREV

Severe Weather Statement
National Weather Service Reno NV
430 PM PDT Wed Jun 23 2021

CAC035-232345-
/O.CON.KREV.SV.W.0003.000000T0000Z-210623T2345Z/
Lassen CA-
430 PM PDT Wed Jun 23 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 445 PM PDT
FOR WESTERN LASSEN COUNTY...

At 429 PM PDT, a severe thunderstorm was located 13 miles northeast
of Old Station, or 19 miles south of Nubieber, moving west at 15 mph.

HAZARD...60 mph wind gusts and quarter size hail.

SOURCE...Radar indicated.

IMPACT...Hail damage to vehicles is expected. Expect wind damage to 
         roofs, siding, fencing and trees.

This severe thunderstorm will remain over mainly rural areas of
western Lassen County.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

For your protection move to an interior room on the lowest floor of a
building.

&&

LAT...LON 4103 12133 4094 12114 4076 12115 4076 12118
      4079 12131
TIME...MOT...LOC 2329Z 107DEG 13KT 4081 12124 

HAIL...1.00IN
WIND...60MPH
 
$$

aky

The office that day

Everything else NWS Reno, NV issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jun 23, 1:02 PM PDT	Excessive Heat Watch	REV	Lassen, Modoc, Plumas, Sierra	62 hr
Jun 23, 4:27 PM PDT	Severe Thunderstorm Warning	REV	Lassen, Plumas	33 min

Nearby

Severe Thunderstorm Warnings in California, 2021 Every severe thunderstorm warning in 2021

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.