Alert archive / California / Severe Thunderstorm Warnings in 2012
Severe Thunderstorm Warning 5, NWS Eureka, CA
NWS Eureka, CA issued this severe thunderstorm warning at Aug 5, 2012, 4:31 PM PDT for Trinity County, California. It was in force for 29 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 5, 2012, 4:31 PM PDT (23:31 UTC)
- Expired
- Aug 5, 2012, 5:00 PM PDT
- In force
- 29 min
- Issued by
- NWS Eureka, CA
- Area
- Storm-based polygon
County Trinity County, CA
The radar
The Eureka (Bunker Hill) radar (KBHX), 82 km from the middle of the area, began a volume at 23:33 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, 11.5 hours before the alert went out and 184 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
- 3 J/kg
- Mixed-layer CIN
- -793 J/kg
- Mixed-layer LCL
- 2407 m above ground
- 0-6 km bulk shear
- 19 kt
- 0-1 km storm-relative helicity
- -51 m²/s²
- 0-3 km storm-relative helicity
- 96 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.1
The text
As transmitted, in the capitals the NWS used until 2016.
358 WUUS56 KEKA 052331 SVREKA CAC105-060000- /O.NEW.KEKA.SV.W.0005.120805T2331Z-120806T0000Z/ BULLETIN - EAS ACTIVATION REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE 431 PM PDT SUN AUG 5 2012 THE NATIONAL WEATHER SERVICE HAS ISSUED A * SEVERE THUNDERSTORM WARNING FOR... TRINITY COUNTY IN NORTHWEST CALIFORNIA... * UNTIL 500 PM PDT * AT 429 PM PDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM CAPABLE OF PRODUCING QUARTER SIZE HAIL...AND DAMAGING WINDS IN EXCESS OF 60 MPH. THIS STORM WAS LOCATED 7 MILES SOUTH OF DEL LOMA...OR 22 MILES WEST OF WEAVERVILLE...AND MOVING NORTH AT 10 MPH. * THE SEVERE THUNDERSTORM WILL OTHERWISE REMAIN OVER MAINLY RURAL AREAS OF THE INDICATED COUNTY. LAT...LON 4083 12347 4087 12331 4067 12330 4065 12337 TIME...MOT...LOC 2331Z 163DEG 9KT 4069 12336 $$ BFG
2 follow-up statements
338 WWUS56 KEKA 052346 SVSEKA SEVERE WEATHER STATEMENT NATIONAL WEATHER SERVICE 446 PM PDT SUN AUG 5 2012 CAC105-060000- /O.CON.KEKA.SV.W.0005.000000T0000Z-120806T0000Z/ TRINITY CA- 446 PM PDT SUN AUG 5 2012 ...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 500 PM PDT FOR TRINITY COUNTY... AT 442 PM PDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO INDICATE A SEVERE THUNDERSTORM CAPABLE OF PRODUCING QUARTER SIZE HAIL...AND DAMAGING WINDS IN EXCESS OF 60 MPH. THIS STORM WAS LOCATED OVER TRINITY COUNTY...OR 21 MILES SOUTHEAST OF WILLOW CREEK...MOVING NORTH AT 10 MPH. THE SEVERE THUNDERSTORM WILL OTHERWISE REMAIN OVER MAINLY RURAL AREAS OF THE INDICATED COUNTY. LAT...LON 4071 12334 4070 12338 4083 12345 4086 12335 TIME...MOT...LOC 2346Z 163DEG 9KT 4073 12337 $$ BFG
912 WWUS56 KEKA 060000 SVSEKA SEVERE WEATHER STATEMENT NATIONAL WEATHER SERVICE 500 PM PDT SUN AUG 5 2012 CAC105-060010- /O.EXP.KEKA.SV.W.0005.000000T0000Z-120806T0000Z/ TRINITY CA- 500 PM PDT SUN AUG 5 2012 ...THE SEVERE THUNDERSTORM WARNING FOR TRINITY COUNTY HAS EXPIRED... LAT...LON 4071 12334 4070 12338 4083 12345 4086 12335 TIME...MOT...LOC 0000Z 163DEG 9KT 4076 12338 $$ BFG
The office that day
Everything else NWS Eureka, CA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 5, 3:22 PM PDT | Special Weather Statement | EKA | Trinity | 38 min |
| Aug 5, 3:26 PM PDT | Severe Thunderstorm Warning | EKA | Humboldt, Trinity | 34 min |
| Aug 5, 3:58 PM PDT | Severe Thunderstorm Warning | EKA | Trinity | 16 min |
| Aug 5, 4:18 PM PDT | Severe Thunderstorm Warning | EKA | Trinity | 27 min |
Nearby
Severe Thunderstorm Warnings in California, 2012Every severe thunderstorm warning in 2012
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.