Alert archive / California / Tornado Warnings in 2012
Tornado Warning 1, NWS San Diego, CA
NWS San Diego, CA issued this tornado warning at Aug 12, 2012, 4:33 PM PDT for Riverside County, California. It was in force for 27 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 12, 2012, 4:33 PM PDT (23:33 UTC)
- Expired
- Aug 12, 2012, 5:00 PM PDT
- In force
- 27 min
- Issued by
- NWS San Diego, CA
- Area
- Storm-based polygon
County Riverside County, CA
The radar
The Santa Ana Mts radar (KSOX), 31 km from the middle of the area, began a volume at 23:36 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, 11.6 hours before the alert went out and 104 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
- 552 J/kg
- Mixed-layer CIN
- -580 J/kg
- Mixed-layer LCL
- 1680 m above ground
- 0-6 km bulk shear
- 17 kt
- 0-1 km storm-relative helicity
- -9 m²/s²
- 0-3 km storm-relative helicity
- 48 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
979
WFUS56 KSGX 122333
TORSGX
CAC065-130000-
/O.NEW.KSGX.TO.W.0001.120812T2333Z-120813T0000Z/
BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE SAN DIEGO CA
433 PM PDT SUN AUG 12 2012
THE NATIONAL WEATHER SERVICE IN SAN DIEGO HAS ISSUED A
* TORNADO WARNING FOR...
WEST CENTRAL RIVERSIDE COUNTY IN SOUTHERN CALIFORNIA...
* UNTIL 500 PM PDT
* AT 424 PM PDT...TRAINED WEATHER SPOTTERS REPORTED A NEARLY
STATIONARY TORNADO ALONG ROUTE 74...JUST WEST OF INTERSTATE 15.
* THE TORNADO WILL OTHERWISE REMAIN OVER MAINLY RURAL AREAS OF THE
INDICATED COUNTY.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
IF IN MOBILE HOMES OR VEHICLES...EVACUATE THEM AND GET INSIDE A
STURDY SHELTER. IF NO SHELTER IS AVAILABLE...LIE FLAT IN THE NEAREST
DITCH OR OTHER LOW SPOT AND COVER YOUR HEAD WITH YOUR HANDS.
THE SAFEST PLACE TO BE DURING A TORNADO IS IN A BASEMENT. GET UNDER A
WORKBENCH OR OTHER PIECE OF STURDY FURNITURE. IF NO BASEMENT IS
AVAILABLE...SEEK SHELTER ON THE LOWEST FLOOR OF THE BUILDING IN AN
INTERIOR HALLWAY OR ROOM SUCH AS A CLOSET. USE BLANKETS OR PILLOWS TO
COVER YOUR BODY AND ALWAYS STAY AWAY FROM WINDOWS.
IF IN MOBILE HOMES OR VEHICLES...EVACUATE THEM AND GET INSIDE A
SUBSTANTIAL SHELTER. IF NO SHELTER IS AVAILABLE...LIE FLAT IN THE
NEAREST DITCH OR OTHER LOW SPOT AND COVER YOUR HEAD WITH YOUR HANDS.
&&
LAT...LON 3373 11744 3381 11728 3380 11724 3373 11719
3365 11731 3363 11737
TIME...MOT...LOC 2332Z 113DEG 4KT 3377 11727
$$
JJT/JT1 follow-up statement
731
WWUS56 KSGX 122359
SVSSGX
SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE SAN DIEGO CA
459 PM PDT SUN AUG 12 2012
CAC065-130008-
/O.EXP.KSGX.TO.W.0001.000000T0000Z-120813T0000Z/
RIVERSIDE CA-
459 PM PDT SUN AUG 12 2012
...THE TORNADO WARNING FOR WEST CENTRAL RIVERSIDE COUNTY WILL EXPIRE
AT 500 PM PDT...
THUNDERSTORMS IN THE WARNED AREA...WHICH PRODUCED A TORNADO...HAVE
DISSIPATED. THEREFORE...THE TORNADO WARNING FOR WEST CENTRAL
RIVERSIDE COUNTY WILL BE ALLOWED TO EXPIRE AT 500 PM PDT.
LAT...LON 3373 11744 3381 11728 3380 11724 3373 11719
3365 11731 3363 11737
TIME...MOT...LOC 2358Z 113DEG 4KT 3378 11730
$$
JJT/JTThe office that day
Everything else NWS San Diego, CA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 12, 3:02 AM PDT | Excessive Heat Warning | SGX | Riverside, San Diego | 64 hr |
| Aug 12, 9:18 AM PDT | Flash Flood Watch | SGX | Riverside, San Bernardino, San Diego | 12 hr |
| Aug 12, 12:52 PM PDT | Areal Flood Advisory | SGX | Riverside, San Bernardino | 85 min |
| Aug 12, 1:21 PM PDT | Areal Flood Advisory | SGX | San Diego | 77 min |
| Aug 12, 1:56 PM PDT | Areal Flood Advisory | SGX | Riverside, San Bernardino | 3 hr |
| Aug 12, 2:13 PM PDT | Areal Flood Advisory | SGX | San Diego | 77 min |
| Aug 12, 2:25 PM PDT | Areal Flood Advisory | SGX | Riverside, San Bernardino | 3 hr |
| Aug 12, 2:55 PM PDT | Flash Flood Warning | SGX | San Diego | 2 hr |
| Aug 12, 3:03 PM PDT | Areal Flood Advisory | SGX | Riverside, San Bernardino | 3 hr |
| Aug 12, 3:48 PM PDT | Severe Thunderstorm Warning | SGX | Riverside | 27 min |
| Aug 12, 4:15 PM PDT | Severe Thunderstorm Warning | SGX | Riverside | 45 min |
Nearby
Tornado Warnings in California, 2012Every tornado warning in 2012Tornadoes 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.