Alert archive / California / Severe Thunderstorm Warnings in 2009
Severe Thunderstorm Warning 19, NWS Eureka, CA
NWS Eureka, CA issued this severe thunderstorm warning at Aug 5, 2009, 6:11 PM PDT for Humboldt County, Trinity County, California. It was in force for 19 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, 2009, 6:11 PM PDT (01:11 UTC)
- Expired
- Aug 5, 2009, 6:30 PM PDT
- In force
- 19 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), 68 km from the middle of the area, began a volume at 01:14 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, 1.2 hours before the alert went out and 191 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
- 277 J/kg
- Mixed-layer CIN
- -42 J/kg
- Mixed-layer LCL
- 3395 m above ground
- 0-6 km bulk shear
- 48 kt
- 0-1 km storm-relative helicity
- 13 m²/s²
- 0-3 km storm-relative helicity
- 148 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.3
The text
As transmitted, in the capitals the NWS used until 2016.
000 WUUS56 KEKA 060111 SVREKA CAC023-105-060130- /O.NEW.KEKA.SV.W.0019.090806T0111Z-090806T0130Z/ BULLETIN - EAS ACTIVATION REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE 611 PM PDT WED AUG 5 2009 THE NATIONAL WEATHER SERVICE HAS ISSUED A * SEVERE THUNDERSTORM WARNING FOR... HUMBOLDT COUNTY IN NORTHWEST CALIFORNIA... TRINITY COUNTY IN NORTHWEST CALIFORNIA... * UNTIL 630 PM PDT * AT 610 PM PDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM CAPABLE OF PRODUCING PENNY SIZE HAIL. THIS STORM WAS LOCATED 7 MILES NORTH OF HYAMPOM...OR 19 MILES SOUTHEAST OF WILLOW CREEK...AND MOVING NORTHWEST AT 15 MPH. * OTHER LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO BURNT RANCH 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 4074 12375 4092 12354 4073 12328 4060 12343 TIME...MOT...LOC 0111Z 131DEG 11KT 4071 12343 $$ MS
1 follow-up statement
000 WWUS56 KEKA 060120 SVSEKA SEVERE WEATHER STATEMENT NATIONAL WEATHER SERVICE 620 PM PDT WED AUG 5 2009 CAC023-105-060130- /O.CON.KEKA.SV.W.0019.000000T0000Z-090806T0130Z/ TRINITY CA-HUMBOLDT CA- 620 PM PDT WED AUG 5 2009 ...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 630 PM PDT FOR HUMBOLDT AND TRINITY COUNTIES... AT 620 PM PDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO INDICATE A SEVERE THUNDERSTORM CAPABLE OF PRODUCING PENNY SIZE HAIL. THIS STORM WAS LOCATED 6 MILES SOUTH OF BURNT RANCH...OR 17 MILES SOUTHEAST OF WILLOW CREEK...MOVING NORTHWEST AT 15 MPH. THE SEVERE THUNDERSTORM WILL OTHERWISE REMAIN OVER MAINLY RURAL AREAS OF THE INDICATED COUNTIES. PRECAUTIONARY/PREPAREDNESS ACTIONS... THIS IS A DANGEROUS STORM. IF YOU ARE IN ITS PATH...PREPARE IMMEDIATELY FOR DAMAGING WINDS...DESTRUCTIVE HAIL...AND DEADLY CLOUD TO GROUND LIGHTNING. PEOPLE OUTSIDE SHOULD MOVE TO A SHELTER... PREFERABLY INSIDE A STRONG BUILDING BUT AWAY FROM WINDOWS. && LAT...LON 4073 12332 4063 12344 4074 12375 4092 12354 TIME...MOT...LOC 0120Z 131DEG 11KT 4073 12346 $$ MS
The office that day
Everything else NWS Eureka, CA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 5, 5:00 PM PDT | Special Weather Statement | EKA | Trinity | 30 min |
| Aug 5, 5:10 PM PDT | Special Weather Statement | EKA | Humboldt | 35 min |
| Aug 5, 5:30 PM PDT | Special Weather Statement | EKA | Trinity | 30 min |
| Aug 5, 5:41 PM PDT | Severe Thunderstorm Warning | EKA | Trinity | 34 min |
| Aug 5, 6:29 PM PDT | Severe Thunderstorm Warning | EKA | Humboldt, Trinity | 16 min |
Nearby
Severe Thunderstorm Warnings in California, 2009Every severe thunderstorm warning in 2009
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.