Alert archive / California / Severe Thunderstorm Warnings in 2020

Severe Thunderstorm Warning 2, NWS Eureka, CA

July 22, 2020Trinity County, California

NWS Eureka, CA issued this severe thunderstorm warning at Jul 22, 2020, 4:13 PM PDT for Trinity County, California. It was in force for 32 min. 1 report came from inside the area while it was in force.

The area

The outline as issued, with what was reported inside it.

The facts

Issued: Jul 22, 2020, 4:13 PM PDT (23:13 UTC)
Expired: Jul 22, 2020, 4:45 PM PDT
In force: 32 min
Issued by: NWS Eureka, CA
Area: Storm-based polygon
Hail: 1.25 in
Wind: 60.0 mph

County Trinity County, CA

The radar

The Eureka (Bunker Hill) radar (KBHX), 115 km from the middle of the area, began a volume at 23:12 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.

What was reported inside it

Time	Report	Where	Remark
Jul 22, 4:15 PM PDT	HAIL 1	Douglas City, CA	ESTIMATED QUARTER SIZE HAIL AND THUNDERSTORM WIND GUSTS FROM 30 TO 40 MPH OBSERVED AT THE DOUGLAS CITY STORE.

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The nearest sounding before it

Medford/Jackson, OR (KMFR), launched 12:00Z, 11.2 hours before the alert went out and 192 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: 1485 m above ground
0-6 km bulk shear: 8 kt
0-1 km storm-relative helicity: -5 m²/s²
0-3 km storm-relative helicity: 56 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

343 
WUUS56 KEKA 222313
SVREKA
CAC105-222345-
/O.NEW.KEKA.SV.W.0002.200722T2313Z-200722T2345Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Eureka CA
413 PM PDT Wed Jul 22 2020

The National Weather Service in Eureka California has issued a

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

* Until 445 PM PDT.

* At 413 PM PDT, a severe thunderstorm was located over Douglas City,
  or near Weaverville, and is nearly stationary.

  HAZARD...60 mph wind gusts and half dollar 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, Junction City, Douglas City and Lewiston. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4058 12288 4059 12303 4074 12307 4073 12285
TIME...MOT...LOC 2313Z 258DEG 4KT 4066 12292 

HAIL...1.25IN
WIND...60MPH
 
$$

Garner

2 follow-up statements

879 
WWUS56 KEKA 222328
SVSEKA

Severe Weather Statement
National Weather Service Eureka CA
428 PM PDT Wed Jul 22 2020

CAC105-222345-
/O.CON.KEKA.SV.W.0002.000000T0000Z-200722T2345Z/
Trinity CA-
428 PM PDT Wed Jul 22 2020

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 445 PM PDT
FOR CENTRAL TRINITY COUNTY...

At 428 PM PDT, a severe thunderstorm was located over Douglas City,
or near Weaverville, and is nearly stationary.

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, Junction City, Douglas City and Lewiston. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4058 12288 4059 12303 4074 12307 4073 12285
TIME...MOT...LOC 2328Z 258DEG 4KT 4066 12290 

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

Garner

590 
WWUS56 KEKA 222338
SVSEKA

Severe Weather Statement
National Weather Service Eureka CA
438 PM PDT Wed Jul 22 2020

CAC105-222347-
/O.EXP.KEKA.SV.W.0002.000000T0000Z-200722T2345Z/
Trinity CA-
438 PM PDT Wed Jul 22 2020

...THE SEVERE THUNDERSTORM WARNING FOR CENTRAL TRINITY COUNTY WILL
EXPIRE AT 445 PM PDT...
                
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 will be allowed to expire.

LAT...LON 4058 12288 4059 12303 4074 12307 4073 12285
TIME...MOT...LOC 2337Z 258DEG 4KT 4066 12289 

$$

Garner

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 22, 2:42 PM PDT	Special Weather Statement	EKA	Trinity	33 min
Jul 22, 3:10 PM PDT	Special Weather Statement	EKA	Trinity	35 min
Jul 22, 3:30 PM PDT	Severe Thunderstorm Warning	EKA	Trinity	15 min
Jul 22, 3:48 PM PDT	Special Weather Statement	EKA	Trinity	42 min
Jul 22, 4:11 PM PDT	Special Weather Statement	EKA	Trinity	49 min
Jul 22, 4:44 PM PDT	Special Weather Statement	EKA	Trinity	46 min

Nearby

Severe Thunderstorm Warnings in California, 2020 Every severe thunderstorm warning in 2020

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.