Alert archive / California / Severe Thunderstorm Warnings in 2024

Severe Thunderstorm Warning 2, NWS Eureka, CA

August 17, 2024Trinity County, California

NWS Eureka, CA issued this severe thunderstorm warning at Aug 17, 2024, 2:48 PM PDT for Trinity County, California. It was in force for 27 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 17, 2024, 2:48 PM PDT (21:48 UTC)
Expired: Aug 17, 2024, 3:15 PM PDT
In force: 27 min
Issued by: NWS Eureka, CA
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

County Trinity County, CA

The radar

The Eureka (Bunker Hill) radar (KBHX), 114 km from the middle of the area, began a volume at 21:47 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 watch it was issued in

The SPC watch in force over the same counties when this warning went out.

Issued	Product	Office	Lasted
Aug 17, 1:22 PM PDT	Severe Thunderstorm Watch	SPC	8 hr

The nearest sounding before it

Medford/Jackson, OR (KMFR), launched 12:00Z, 9.8 hours before the alert went out and 167 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: 1389 m above ground
0-6 km bulk shear: 40 kt
0-1 km storm-relative helicity: 49 m²/s²
0-3 km storm-relative helicity: 187 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 1.1

Open this sounding in Storm Lab

The text

As transmitted.

269 
WUUS56 KEKA 172148
SVREKA
CAC105-172215-
/O.NEW.KEKA.SV.W.0002.240817T2148Z-240817T2215Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Eureka CA
248 PM PDT Sat Aug 17 2024

The National Weather Service in Eureka California has issued a

* Severe Thunderstorm Warning for...
  Central Trinity County in northwestern California...

* Until 315 PM PDT.

* At 248 PM PDT, severe thunderstorms were located along a line
  extending from Big Bar to near Douglas City, moving northeast at 30
  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, and trees.

* Locations impacted include...
  Weaverville, Hayfork, Big Bar, Junction City, and Helena.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4065 12297 4071 12332 4106 12318 4102 12304
      4101 12304 4101 12301 4091 12271
TIME...MOT...LOC 2148Z 210DEG 25KT 4071 12325 4067 12298 

HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.00 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH

$$

ZVS

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 17, 11:46 AM PDT	Special Weather Statement	EKA	Trinity	29 min
Aug 17, 12:11 PM PDT	Special Weather Statement	EKA	Trinity	34 min
Aug 17, 12:46 PM PDT	Special Weather Statement	EKA	Siskiyou	29 min
Aug 17, 1:03 PM PDT	Severe Thunderstorm Warning	EKA	Trinity	27 min
Aug 17, 1:41 PM PDT	Special Weather Statement	EKA	Trinity	34 min
Aug 17, 2:11 PM PDT	Special Weather Statement	EKA	Siskiyou	34 min
Aug 17, 2:15 PM PDT	Special Weather Statement	EKA		30 min
Aug 17, 2:19 PM PDT	Special Marine Warning	EKA		41 min
Aug 17, 2:22 PM PDT	Special Weather Statement	EKA	Trinity	23 min
Aug 17, 2:42 PM PDT	Special Weather Statement	EKA	Mendocino	33 min
Aug 17, 2:44 PM PDT	Special Weather Statement	EKA	Trinity	31 min
Aug 17, 3:00 PM PDT	Special Weather Statement	EKA	Trinity	30 min
Aug 17, 3:05 PM PDT	Special Weather Statement	EKA	Del Norte	25 min
Aug 17, 3:11 PM PDT	Severe Thunderstorm Warning	EKA	Trinity	34 min
Aug 17, 3:22 PM PDT	Special Weather Statement	EKA	Trinity	23 min
Aug 17, 3:30 PM PDT	Severe Thunderstorm Warning	EKA	Trinity	30 min
Aug 17, 3:35 PM PDT	Special Weather Statement	EKA	Trinity	25 min

Nearby

Severe Thunderstorm Warnings in California, 2024 Every severe thunderstorm warning in 2024

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.