Alert archive / California / Severe Thunderstorm Warnings in 2017
Severe Thunderstorm Warning 6, NWS Eureka, CA
NWS Eureka, CA issued this severe thunderstorm warning at Aug 9, 2017, 3:05 PM PDT for Trinity County, California. It was in force for 25 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 9, 2017, 3:05 PM PDT (22:05 UTC)
- Expired
- Aug 9, 2017, 3:30 PM PDT
- In force
- 25 min
- Issued by
- NWS Eureka, CA
- Area
- Storm-based polygon
- Hail
- 1.25 in
- Wind
- 50.0 mph
County Trinity County, CA
The radar
The Eureka (Bunker Hill) radar (KBHX), 95 km from the middle of the area, began a volume at 22:07 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, 10.1 hours before the alert went out and 168 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.
- Mixed-layer CAPE
- 166 J/kg
- Mixed-layer CIN
- -462 J/kg
- Mixed-layer LCL
- 1690 m above ground
- 0-6 km bulk shear
- 11 kt
- 0-1 km storm-relative helicity
- -4 m²/s²
- 0-3 km storm-relative helicity
- 117 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
688
WUUS56 KEKA 092205
SVREKA
CAC105-092230-
/O.NEW.KEKA.SV.W.0006.170809T2205Z-170809T2230Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Eureka CA
305 PM PDT WED AUG 9 2017
The National Weather Service in Eureka California has issued a
* Severe Thunderstorm Warning for...
West central Trinity County in northwestern California...
* Until 330 PM PDT
* At 304 PM PDT, a severe thunderstorm was located near Denny, or 17
miles east of Willow Creek, moving southwest at 15 mph.
HAZARD...Half dollar size hail.
SOURCE...Radar indicated.
IMPACT...Damage to vehicles is expected.
* Locations impacted include...
Denny.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
&&
LAT...LON 4101 12328 4090 12316 4081 12327 4081 12339
4093 12347
TIME...MOT...LOC 2204Z 061DEG 12KT 4089 12331
HAIL...1.25IN
WIND...<50MPH
$$
GARNER2 follow-up statements
308
WWUS56 KEKA 092218
SVSEKA
Severe Weather Statement
National Weather Service Eureka CA
318 PM PDT WED AUG 9 2017
CAC105-092230-
/O.CON.KEKA.SV.W.0006.000000T0000Z-170809T2230Z/
Trinity CA-
318 PM PDT WED AUG 9 2017
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 330 PM PDT
FOR WEST CENTRAL TRINITY COUNTY...
At 317 PM PDT, a severe thunderstorm was located near Denny, or 14
miles east of Willow Creek, moving southwest at 15 mph.
HAZARD...Half dollar size hail.
SOURCE...Radar indicated.
IMPACT...Damage to vehicles is expected.
Locations impacted include...
Denny.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
&&
LAT...LON 4098 12335 4096 12323 4090 12316 4081 12327
4081 12339 4093 12347
TIME...MOT...LOC 2217Z 061DEG 12KT 4087 12336
HAIL...1.25IN
WIND...<50MPH
$$
GARNER966
WWUS56 KEKA 092224
SVSEKA
Severe Weather Statement
National Weather Service Eureka CA
324 PM PDT WED AUG 9 2017
CAC105-092233-
/O.EXP.KEKA.SV.W.0006.000000T0000Z-170809T2230Z/
Trinity CA-
324 PM PDT WED AUG 9 2017
...THE SEVERE THUNDERSTORM WARNING FOR WEST CENTRAL TRINITY COUNTY
WILL EXPIRE AT 330 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. However small hail
and gusty winds are still possible with this thunderstorm.
To report severe weather, contact your nearest law enforcement
agency. They will relay your report to the National Weather Service
Eureka California.
LAT...LON 4098 12335 4096 12323 4090 12316 4081 12327
4081 12339 4093 12347
TIME...MOT...LOC 2223Z 061DEG 12KT 4086 12338
$$
GARNERThe office that day
Everything else NWS Eureka, CA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 8, 5:26 PM PDT | Special Weather Statement | EKA | Trinity | 34 min |
| Aug 8, 5:52 PM PDT | Special Weather Statement | EKA | Trinity | 23 min |
| Aug 8, 6:51 PM PDT | Special Weather Statement | EKA | 24 min | |
| Aug 8, 7:14 PM PDT | Special Weather Statement | EKA | 31 min | |
| Aug 9, 1:32 PM PDT | Special Weather Statement | EKA | 43 min | |
| Aug 9, 1:50 PM PDT | Severe Thunderstorm Warning | EKA | Mendocino, Trinity | 23 min |
| Aug 9, 2:28 PM PDT | Severe Thunderstorm Warning | EKA | Trinity | 32 min |
| Aug 9, 2:34 PM PDT | Special Weather Statement | EKA | Mendocino | 26 min |
| Aug 9, 2:40 PM PDT | Special Weather Statement | EKA | Trinity | 35 min |
| Aug 9, 2:50 PM PDT | Severe Thunderstorm Warning | EKA | Mendocino | 25 min |
| Aug 9, 2:52 PM PDT | Special Weather Statement | EKA | Trinity | 23 min |
| Aug 9, 3:10 PM PDT | Severe Thunderstorm Warning | EKA | Mendocino | 35 min |
| Aug 9, 3:23 PM PDT | Special Weather Statement | EKA | Trinity | 22 min |
| Aug 9, 3:43 PM PDT | Special Weather Statement | EKA | Mendocino | 32 min |
| Aug 9, 3:47 PM PDT | Special Weather Statement | EKA | Trinity | 28 min |
| Aug 9, 3:50 PM PDT | Special Weather Statement | EKA | Trinity | 25 min |
| Aug 9, 4:09 PM PDT | Special Weather Statement | EKA | Mendocino | 36 min |
| Aug 9, 4:12 PM PDT | Special Weather Statement | EKA | Trinity | 33 min |
| Aug 9, 4:41 PM PDT | Special Weather Statement | EKA | Trinity | 34 min |
Nearby
Severe Thunderstorm Warnings in California, 2017Every severe thunderstorm warning in 2017
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.