Alert archive / California / Severe Thunderstorm Warnings in 2012
Severe Thunderstorm Warning 2, NWS Los Angeles, CA
NWS Los Angeles, CA issued this severe thunderstorm warning at Sep 9, 2012, 4:46 PM PDT for Los Angeles County, California. It was in force for 39 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
- Sep 9, 2012, 4:46 PM PDT (23:46 UTC)
- Expired
- Sep 9, 2012, 5:25 PM PDT
- In force
- 39 min
- Issued by
- NWS Los Angeles, CA
- Area
- Storm-based polygon
County Los Angeles County, CA
The radar
The Santa Ana Mts radar (KSOX), 64 km from the middle of the area, began a volume at 23:45 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
San Diego, CA (KNKX), launched 12:00Z, 11.8 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
- 145 J/kg
- Mixed-layer CIN
- -540 J/kg
- Mixed-layer LCL
- 1281 m above ground
- 0-6 km bulk shear
- 13 kt
- 0-1 km storm-relative helicity
- 61 m²/s²
- 0-3 km storm-relative helicity
- 77 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
976 WUUS56 KLOX 092346 SVRLOX CAC037-100045- /O.NEW.KLOX.SV.W.0002.120909T2346Z-120910T0045Z/ BULLETIN - EAS ACTIVATION REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE OXNARD CA 446 PM PDT SUN SEP 9 2012 THE NATIONAL WEATHER SERVICE IN OXNARD HAS ISSUED A * SEVERE THUNDERSTORM WARNING FOR... EAST CENTRAL LOS ANGELES COUNTY IN SOUTHWEST CALIFORNIA... * UNTIL 545 PM PDT * AT 439 PM PDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM CAPABLE OF PRODUCING NICKEL SIZE HAIL...AND DAMAGING WINDS IN EXCESS OF 60 MPH. THIS STORM WAS LOCATED 7 MILES NORTH OF FALLING SPRINGS...OR 21 MILES NORTHEAST OF SIERRA MADRE... AND MOVING SOUTHWEST AT 5 MPH. * THE SEVERE THUNDERSTORM WILL CROSS OVER THE ANGELES CREST HIGHWAY IN THE LOS ANGELES COUNTY MOUNTAINS WITHIN THE NEXT 10 MINUTES. 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 3423 11795 3443 11807 3452 11779 3436 11769 TIME...MOT...LOC 2343Z 064DEG 6KT 3440 11784 $$ HALL
1 follow-up statement
537 WWUS56 KLOX 100025 SVSLOX SEVERE WEATHER STATEMENT NATIONAL WEATHER SERVICE OXNARD CA 525 PM PDT SUN SEP 9 2012 CAC037-100035- /O.CAN.KLOX.SV.W.0002.000000T0000Z-120910T0045Z/ LOS ANGELES CA- 525 PM PDT SUN SEP 9 2012 ...THE SEVERE THUNDERSTORM WARNING FOR EAST CENTRAL LOS ANGELES COUNTY IS CANCELLED... LAT...LON 3423 11795 3443 11807 3452 11779 3436 11769 TIME...MOT...LOC 0025Z 064DEG 6KT 3437 11792 $$ HALL
The office that day
Everything else NWS Los Angeles, CA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Sep 9, 3:32 AM PDT | Flash Flood Watch | LOX | 17 hr |
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.