Alert archive / California / Severe Thunderstorm Warnings in 2017
Severe Thunderstorm Warning 14, NWS Eureka, CA
NWS Eureka, CA issued this severe thunderstorm warning at Sep 6, 2017, 5:40 PM PDT for Trinity County, California. It was in force for 20 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
- Sep 6, 2017, 5:40 PM PDT (00:40 UTC)
- Expired
- Sep 6, 2017, 6:00 PM PDT
- In force
- 20 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), 84 km from the middle of the area, began a volume at 00:41 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 00:00Z, 0.7 hours before the alert went out and 222 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
- 146 J/kg
- Mixed-layer CIN
- -317 J/kg
- Mixed-layer LCL
- 1964 m above ground
- 0-6 km bulk shear
- 28 kt
- 0-1 km storm-relative helicity
- -6 m²/s²
- 0-3 km storm-relative helicity
- 62 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.2
The text
As transmitted.
900
WUUS56 KEKA 070040
SVREKA
CAC105-070115-
/O.NEW.KEKA.SV.W.0014.170907T0040Z-170907T0115Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Eureka CA
540 PM PDT WED SEP 6 2017
The National Weather Service in Eureka California has issued a
* Severe Thunderstorm Warning for...
West central Trinity County in northwestern California...
* Until 615 PM PDT
* At 539 PM PDT, a severe thunderstorm was located over Forest Glen,
or 14 miles southwest of Hayfork, moving north at 20 mph.
HAZARD...Up to 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...
Forest Glen.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
Large hail and damaging winds and continuous cloud to ground
lightning is occurring with this storm. Move indoors immediately.
Lightning is one of nature's leading killers. Remember, if you can
hear thunder, you are close enough to be struck by lightning.
&&
LAT...LON 4035 12323 4033 12331 4046 12348 4055 12328
TIME...MOT...LOC 0039Z 159DEG 19KT 4040 12330
HAIL...1.00IN
WIND...60MPH
$$
KR2 follow-up statements
303 WWUS56 KEKA 070052 SVSEKA Severe Weather Statement National Weather Service Eureka CA 552 PM PDT WED SEP 6 2017 CAC105-070115- /O.CON.KEKA.SV.W.0014.000000T0000Z-170907T0115Z/ Trinity CA- 552 PM PDT WED SEP 6 2017 ...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 615 PM PDT FOR WEST CENTRAL TRINITY COUNTY... At 551 PM PDT, a severe thunderstorm was located near Forest Glen, or 12 miles southwest of Hayfork, moving north at 20 mph. HAZARD...Up to 60 mph wind gusts and up to penny size hail. SOURCE...Radar indicated. IMPACT...Expect damage to roofs, siding, and trees. This severe thunderstorm will remain over mainly rural areas of west central Trinity County. PRECAUTIONARY/PREPAREDNESS ACTIONS... For your protection move to an interior room on the lowest floor of a building. Continuous cloud to ground lightning is occurring with this storm. Move indoors immediately. Lightning is one of nature's leading killers. Remember, if you can hear thunder, you are close enough to be struck by lightning. && LAT...LON 4043 12329 4040 12336 4048 12344 4053 12332 TIME...MOT...LOC 0051Z 159DEG 19KT 4046 12333 HAIL...0.75IN WIND...60MPH $$ KR
080
WWUS56 KEKA 070100
SVSEKA
Severe Weather Statement
National Weather Service Eureka CA
600 PM PDT WED SEP 6 2017
CAC105-070109-
/O.CAN.KEKA.SV.W.0014.000000T0000Z-170907T0115Z/
Trinity CA-
600 PM PDT WED SEP 6 2017
...THE SEVERE THUNDERSTORM WARNING FOR WEST CENTRAL TRINITY COUNTY IS
CANCELLED...
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 has been cancelled.
LAT...LON 4043 12329 4040 12336 4048 12344 4053 12332
TIME...MOT...LOC 0057Z 159DEG 19KT 4050 12335
$$
KRThe office that day
Everything else NWS Eureka, CA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Sep 6, 5:58 PM PDT | Severe Thunderstorm Warning | EKA | Trinity | 12 min |
| Sep 6, 6:13 PM PDT | Special Weather Statement | EKA | Trinity | 17 min |
| Sep 7, 3:15 AM PDT | Small Craft Advisory | EKA | 10 days | |
| Sep 7, 4:24 AM PDT | Special Weather Statement | EKA | 51 min | |
| Sep 7, 4:27 AM PDT | Special Weather Statement | EKA | Trinity | 33 min |
| Sep 7, 5:34 AM PDT | Special Weather Statement | EKA | Del Norte | 26 min |
| Sep 7, 5:59 AM PDT | Special Weather Statement | EKA | Del Norte | 46 min |
| Sep 7, 6:49 AM PDT | Special Weather Statement | EKA | Del Norte | 26 min |
| Sep 7, 7:22 AM PDT | Special Weather Statement | EKA | Del Norte | 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.