Alert archive / California / Special Weather Statements in 2017
Special Weather Statement, NWS Eureka, CA
NWS Eureka, CA issued this special weather statement at Aug 6, 2017, 4:16 PM PDT for Trinity County, California. It was in force for 14 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 6, 2017, 4:16 PM PDT (23:16 UTC)
- Expired
- Aug 6, 2017, 4:30 PM PDT
- In force
- 14 min
- Issued by
- NWS Eureka, CA
County Trinity County, CA
The radar
The Medford radar (KMAX), 121 km from the middle of the area, began a volume at 23:17 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, 11.3 hours before the alert went out and 152 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
- 2593 m above ground
- 0-6 km bulk shear
- 4 kt
- 0-1 km storm-relative helicity
- 10 m²/s²
- 0-3 km storm-relative helicity
- 54 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
810
WWUS86 KEKA 062316
SPSEKA
Special Weather Statement
National Weather Service Eureka CA
416 PM PDT SUN AUG 6 2017
CAZ107-062330-
Northern Trinity CA-
416 PM PDT SUN AUG 6 2017
...SIGNIFICANT WEATHER ADVISORY FOR NORTH CENTRAL TRINITY COUNTY
UNTIL 430 PM PDT...
At 415 PM PDT, Doppler radar was tracking a strong thunderstorm 13
miles north of Helena, or 16 miles north of Weaverville, moving north
at 5 mph.
Dime size hail and winds in excess of 30 mph will be possible with
this storm.
This storm will remain over mainly rural areas of north central
Trinity County.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Frequent cloud to ground lightning is occurring with this storm.
Lightning can strike 10 miles away from a thunderstorm. Seek a safe
shelter inside a building or vehicle.
&&
LAT...LON 4088 12290 4086 12314 4105 12323 4107 12310
4105 12306 4100 12304 4101 12298 4101 12296
4099 12294 4099 12292 4103 12290 4107 12292
4107 12295 4108 12296 4109 12288
TIME...MOT...LOC 2315Z 172DEG 5KT 4095 12304
$$
MKKThe office that day
Everything else NWS Eureka, CA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 6, 2:18 PM PDT | Special Weather Statement | EKA | Trinity | 12 min |
| Aug 6, 2:33 PM PDT | Special Weather Statement | EKA | Trinity | 12 min |
| Aug 6, 2:48 PM PDT | Special Weather Statement | EKA | 12 min | |
| Aug 6, 2:54 PM PDT | Special Weather Statement | EKA | Trinity | 21 min |
| Aug 6, 2:58 PM PDT | Special Weather Statement | EKA | Trinity | 17 min |
| Aug 6, 3:08 PM PDT | Special Weather Statement | EKA | Trinity | 22 min |
| Aug 6, 3:16 PM PDT | Special Weather Statement | EKA | Glenn | 14 min |
| Aug 6, 3:32 PM PDT | Special Weather Statement | EKA | Trinity | 13 min |
| Aug 6, 3:37 PM PDT | Special Weather Statement | EKA | 8 min | |
| Aug 6, 3:49 PM PDT | Special Weather Statement | EKA | Trinity | 11 min |
| Aug 6, 4:04 PM PDT | Special Weather Statement | EKA | Siskiyou | 26 min |
| Aug 6, 4:39 PM PDT | Special Weather Statement | EKA | Siskiyou | 21 min |
| Aug 6, 4:53 PM PDT | Special Weather Statement | EKA | Trinity | 22 min |
| Aug 6, 4:57 PM PDT | Special Weather Statement | EKA | Siskiyou | 33 min |
Nearby
Special Weather Statements in California, 2017Every special weather statement 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.