Alert archive / California / Severe Thunderstorm Warnings in 2017
Severe Thunderstorm Warning 11, NWS Eureka, CA
NWS Eureka, CA issued this severe thunderstorm warning at Aug 10, 2017, 4:08 PM PDT for Trinity County, California. It was in force for 37 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
- Aug 10, 2017, 4:08 PM PDT (23:08 UTC)
- Expired
- Aug 10, 2017, 4:45 PM PDT
- In force
- 37 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), 80 km from the middle of the area, began a volume at 23:10 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 |
|---|---|---|---|
| Aug 10, 4:20 PM PDT | HAIL 1 | 2 W Burnt Ranch, CA | ESTIMATED THE LARGEST HAIL STONES TO BE THE SIZE OF A QUARTER. STORM LASTED FROM SOMEWHERE BETWEEN 4 AND 430 UNTIL 5 PM. RAIN WAS VERY HEAVY. |
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, 11.1 hours before the alert went out and 178 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
- 130 J/kg
- Mixed-layer CIN
- -439 J/kg
- Mixed-layer LCL
- 1837 m above ground
- 0-6 km bulk shear
- 13 kt
- 0-1 km storm-relative helicity
- -5 m²/s²
- 0-3 km storm-relative helicity
- 32 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
570
WUUS56 KEKA 102308
SVREKA
CAC105-102345-
/O.NEW.KEKA.SV.W.0011.170810T2308Z-170810T2345Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Eureka CA
408 PM PDT THU AUG 10 2017
The National Weather Service in Eureka California has issued a
* Severe Thunderstorm Warning for...
West central Trinity County in northwestern California...
* Until 445 PM PDT
* At 408 PM PDT, a severe thunderstorm was located over Burnt Ranch,
or 11 miles southeast of Willow Creek, 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...
Burnt Ranch.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
&&
LAT...LON 4093 12352 4092 12350 4084 12335 4072 12341
4079 12355
TIME...MOT...LOC 2308Z 030DEG 2KT 4082 12347
HAIL...1.00IN
WIND...60MPH
$$
RPA2 follow-up statements
742
WWUS56 KEKA 102323
SVSEKA
Severe Weather Statement
National Weather Service Eureka CA
423 PM PDT THU AUG 10 2017
CAC105-102345-
/O.CON.KEKA.SV.W.0011.000000T0000Z-170810T2345Z/
Trinity CA-
423 PM PDT THU AUG 10 2017
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 445 PM PDT
FOR NORTHWESTERN TRINITY COUNTY...
At 423 PM PDT, a severe thunderstorm was located over Burnt Ranch, or
11 miles southeast of Willow Creek, and is nearly stationary.
HAZARD...60 mph wind gusts and quarter size hail.
SOURCE...Radar indicated.
IMPACT...Hail damage to vehicles is expected. Expect wind damage to
roofs, siding, and trees.
Locations impacted include...
Burnt Ranch.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
&&
LAT...LON 4090 12351 4089 12349 4084 12337 4074 12342
4079 12355
TIME...MOT...LOC 2323Z 030DEG 2KT 4081 12348
HAIL...1.00IN
WIND...60MPH
$$
RPA480
WWUS56 KEKA 102346
SVSEKA
Severe Weather Statement
National Weather Service Eureka CA
446 PM PDT THU AUG 10 2017
CAC105-102355-
/O.EXP.KEKA.SV.W.0011.000000T0000Z-170810T2345Z/
Trinity CA-
446 PM PDT THU AUG 10 2017
...THE SEVERE THUNDERSTORM WARNING FOR NORTHWESTERN TRINITY COUNTY
HAS EXPIRED...
The severe thunderstorm which prompted the warning has
weakened. Therefore, the warning has been allowed to expire.
LAT...LON 4090 12351 4089 12349 4084 12337 4074 12342
4079 12355
TIME...MOT...LOC 2345Z 030DEG 2KT 4080 12349
$$
RPAThe office that day
Everything else NWS Eureka, CA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 10, 1:17 PM PDT | Special Weather Statement | EKA | Trinity | 28 min |
| Aug 10, 1:57 PM PDT | Special Weather Statement | EKA | Trinity | 33 min |
| Aug 10, 2:09 PM PDT | Special Weather Statement | EKA | Trinity | 36 min |
| Aug 10, 2:26 PM PDT | Small Craft Advisory | EKA | 8 days | |
| Aug 10, 2:28 PM PDT | Special Weather Statement | EKA | Trinity | 32 min |
| Aug 10, 2:43 PM PDT | Special Weather Statement | EKA | Trinity | 32 min |
| Aug 10, 3:06 PM PDT | Special Weather Statement | EKA | Trinity | 39 min |
| Aug 10, 3:28 PM PDT | Severe Thunderstorm Warning | EKA | Trinity | 32 min |
| Aug 10, 3:30 PM PDT | Severe Thunderstorm Warning | EKA | Trinity | 30 min |
| Aug 10, 3:53 PM PDT | Special Weather Statement | EKA | Trinity | 37 min |
| Aug 10, 4:03 PM PDT | Special Weather Statement | EKA | Mendocino | 42 min |
| Aug 10, 4:05 PM PDT | Severe Thunderstorm Warning | EKA | Trinity | 25 min |
| Aug 10, 4:30 PM PDT | Severe Thunderstorm Warning | EKA | Trinity | 30 min |
| Aug 10, 4:45 PM PDT | Areal Flood Advisory | EKA | Trinity | 105 min |
| Aug 10, 4:48 PM PDT | Special Weather Statement | EKA | Humboldt | 27 min |
| Aug 10, 4:52 PM PDT | Special Weather Statement | EKA | Trinity | 23 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.