Alert archive / California / Severe Thunderstorm Warnings in 2013
Severe Thunderstorm Warning 9, NWS Eureka, CA
NWS Eureka, CA issued this severe thunderstorm warning at Aug 21, 2013, 2:22 PM PDT for Humboldt County, Trinity County, California. It was in force for 38 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 21, 2013, 2:22 PM PDT (21:22 UTC)
- Expired
- Aug 21, 2013, 3:00 PM PDT
- In force
- 38 min
- Issued by
- NWS Eureka, CA
- Area
- Storm-based polygon
Counties Humboldt County, CA, Trinity County, CA
The radar
The Eureka (Bunker Hill) radar (KBHX), 55 km from the middle of the area, began a volume at 21:25 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, 9.4 hours before the alert went out and 202 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
- 2413 m above ground
- 0-6 km bulk shear
- 6 kt
- 0-1 km storm-relative helicity
- 6 m²/s²
- 0-3 km storm-relative helicity
- 32 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
268 WUUS56 KEKA 212122 SVREKA CAC023-105-212200- /O.NEW.KEKA.SV.W.0009.130821T2122Z-130821T2200Z/ BULLETIN - EAS ACTIVATION REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE EUREKA CA 222 PM PDT WED AUG 21 2013 THE NATIONAL WEATHER SERVICE HAS ISSUED A * SEVERE THUNDERSTORM WARNING FOR... HUMBOLDT COUNTY IN NORTHWEST CALIFORNIA... TRINITY COUNTY IN NORTHWEST CALIFORNIA... * UNTIL 300 PM PDT * AT 214 PM PDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM CAPABLE OF PRODUCING QUARTER SIZE HAIL. THIS STORM WAS LOCATED OVER HUMBOLDT COUNTY...OR 26 MILES SOUTH OF WILLOW CREEK...AND MOVING NORTHWEST AT 20 MPH. * THE SEVERE THUNDERSTORM WILL OTHERWISE REMAIN OVER MAINLY RURAL AREAS OF THE INDICATED COUNTY. PRECAUTIONARY/PREPAREDNESS ACTIONS... THIS IS A DANGEROUS STORM. IF YOU ARE IN ITS PATH...PREPARE IMMEDIATELY FOR DAMAGING WINDS...DESTRUCTIVE HAIL...AND DEADLY CLOUD TO GROUND LIGHTNING. PEOPLE OUTSIDE SHOULD MOVE TO A SHELTER... PREFERABLY INSIDE A STRONG BUILDING BUT AWAY FROM WINDOWS. && LAT...LON 4075 12388 4086 12362 4056 12342 4047 12362 TIME...MOT...LOC 2122Z 149DEG 19KT 4060 12359 $$ MS
2 follow-up statements
677 WWUS56 KEKA 212137 SVSEKA SEVERE WEATHER STATEMENT NATIONAL WEATHER SERVICE EUREKA CA 237 PM PDT WED AUG 21 2013 CAC023-105-212200- /O.CON.KEKA.SV.W.0009.000000T0000Z-130821T2200Z/ HUMBOLDT CA-TRINITY CA- 237 PM PDT WED AUG 21 2013 ...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 300 PM PDT FOR TRINITY AND HUMBOLDT COUNTIES... AT 225 PM PDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO INDICATE A SEVERE THUNDERSTORM CAPABLE OF PRODUCING QUARTER SIZE HAIL. THIS STORM WAS LOCATED OVER HUMBOLDT COUNTY...OR 23 MILES SOUTH OF WILLOW CREEK...MOVING NORTHWEST AT 20 MPH. THE SEVERE THUNDERSTORM WILL OTHERWISE REMAIN OVER MAINLY RURAL AREAS OF THE INDICATED COUNTY. PRECAUTIONARY/PREPAREDNESS ACTIONS... THIS IS A DANGEROUS STORM. IF YOU ARE IN ITS PATH...PREPARE IMMEDIATELY FOR DAMAGING WINDS...DESTRUCTIVE HAIL...AND DEADLY CLOUD TO GROUND LIGHTNING. PEOPLE OUTSIDE SHOULD MOVE TO A SHELTER... PREFERABLY INSIDE A STRONG BUILDING BUT AWAY FROM WINDOWS. && LAT...LON 4054 12346 4049 12360 4075 12388 4086 12362 TIME...MOT...LOC 2137Z 149DEG 19KT 4067 12364 $$ MS
391 WWUS56 KEKA 212201 SVSEKA SEVERE WEATHER STATEMENT NATIONAL WEATHER SERVICE EUREKA CA 301 PM PDT WED AUG 21 2013 CAC023-105-212211- /O.EXP.KEKA.SV.W.0009.000000T0000Z-130821T2200Z/ HUMBOLDT CA-TRINITY CA- 301 PM PDT WED AUG 21 2013 ...THE SEVERE THUNDERSTORM WARNING FOR TRINITY AND HUMBOLDT COUNTIES HAS EXPIRED... LAT...LON 4054 12346 4049 12360 4075 12388 4086 12362 TIME...MOT...LOC 2137Z 149DEG 19KT 4067 12364 $$ MS
The office that day
Everything else NWS Eureka, CA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 21, 3:09 AM PDT | Small Craft Advisory | EKA | 12 hr | |
| Aug 21, 1:18 PM PDT | Special Weather Statement | EKA | Trinity | 42 min |
| Aug 21, 1:59 PM PDT | Special Weather Statement | EKA | Humboldt | 46 min |
| Aug 21, 2:40 PM PDT | Special Weather Statement | EKA | Trinity | 50 min |
| Aug 21, 2:56 PM PDT | Severe Thunderstorm Warning | EKA | Trinity | 49 min |
| Aug 21, 4:18 PM PDT | Special Weather Statement | EKA | Del Norte | 42 min |
| Aug 21, 4:33 PM PDT | Special Weather Statement | EKA | Trinity | 27 min |
Nearby
Severe Thunderstorm Warnings in California, 2013Every severe thunderstorm warning in 2013
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.