Alert archive / California / Severe Thunderstorm Warnings in 2017
Severe Thunderstorm Warning 3, NWS Eureka, CA
NWS Eureka, CA issued this severe thunderstorm warning at Aug 9, 2017, 1:50 PM PDT for Mendocino County, Trinity County, California. It was in force for 23 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, 1:50 PM PDT (20:50 UTC)
- Expired
- Aug 9, 2017, 2:13 PM PDT
- In force
- 23 min
- Issued by
- NWS Eureka, CA
- Area
- Storm-based polygon
- Hail
- 1.0 in
- Wind
- 60.0 mph
Counties Mendocino County, CA, Trinity County, CA
The radar
The Eureka (Bunker Hill) radar (KBHX), 122 km from the middle of the area, began a volume at 20:50 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
Oakland, CA (KOAK), launched 12:00Z, 8.8 hours before the alert went out and 263 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
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 797 m above ground
- 0-6 km bulk shear
- 5 kt
- 0-1 km storm-relative helicity
- 3 m²/s²
- 0-3 km storm-relative helicity
- 17 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
856
WUUS56 KEKA 092050
SVREKA
CAC045-105-092130-
/O.NEW.KEKA.SV.W.0003.170809T2050Z-170809T2130Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Eureka CA
150 PM PDT WED AUG 9 2017
The National Weather Service in Eureka California has issued a
* Severe Thunderstorm Warning for...
Northern Mendocino County in northwestern California...
South central Trinity County in northwestern California...
* Until 230 PM PDT
* At 150 PM, a severe thunderstorm was located 15 miles southwest of
Saddle Camp, or 20 miles northeast of Covelo, moving southwest at
5 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.
* This severe thunderstorm will remain over mainly rural areas of
northern Mendocino and south central Trinity Counties.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Prepare immediately for large hail and damaging winds. People outside
should move immediately to shelter inside a strong building. Stay
away from windows.
To report severe weather, contact your nearest law enforcement
agency. They will send your report to the National Weather Service
office in Eureka California.
Torrential rainfall is occurring with this storm, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.
&&
LAT...LON 3984 12303 4000 12332 4015 12310 4009 12297
4008 12297 4005 12295 4003 12295 4002 12296
4001 12295 4000 12295 3999 12294
TIME...MOT...LOC 2050Z 034DEG 6KT 4006 12306
HAIL...1.00IN
WIND...60MPH
$$
SEC1 follow-up statement
992
WWUS56 KEKA 092113
SVSEKA
Severe Weather Statement
National Weather Service Eureka CA
213 PM PDT WED AUG 9 2017
CAC045-105-092122-
/O.CAN.KEKA.SV.W.0003.000000T0000Z-170809T2130Z/
Mendocino CA-Trinity CA-
213 PM PDT WED AUG 9 2017
...THE SEVERE THUNDERSTORM WARNING FOR NORTHERN MENDOCINO AND SOUTH
CENTRAL TRINITY COUNTIES IS CANCELLED...
The storm which prompted the warning has weakened below severe
limits, and no longer poses an immediate threat to life or property.
Therefore the warning has been cancelled.
To report severe weather, contact your nearest law enforcement
agency. They will relay your report to the National Weather Service
Eureka California.
LAT...LON 3984 12303 4000 12332 4015 12310 4009 12297
4008 12297 4005 12295 4003 12295 4002 12296
4001 12295 4000 12295 3999 12294
TIME...MOT...LOC 2111Z 034DEG 6KT 4003 12309
$$
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, 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, 3:05 PM PDT | Severe Thunderstorm Warning | EKA | Trinity | 25 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.