Alert archive / California / Tornado Warnings in 2023

Tornado Warning 2, NWS San Diego, CA

August 20, 2023San Diego County, California

NWS San Diego, CA issued this tornado warning at Aug 20, 2023, 3:37 PM PDT for San Diego County, California. It was in force for 23 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 20, 2023, 3:37 PM PDT (22:37 UTC)
Expired: Aug 20, 2023, 4:00 PM PDT
In force: 23 min
Issued by: NWS San Diego, CA
Area: Storm-based polygon
Tornado: Radar indicated
Hail: 0.75 in

County San Diego County, CA

The radar

The San Diego radar (KNKX), 35 km from the middle of the area, began a volume at 22:41 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, 10.6 hours before the alert went out and 48 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.

Skew-T log-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.

Mixed-layer CAPE: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 1111 m above ground
0-6 km bulk shear: 43 kt
0-1 km storm-relative helicity: 188 m²/s²
0-3 km storm-relative helicity: 325 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

954 
WFUS56 KSGX 202237
TORSGX
CAC073-202300-
/O.NEW.KSGX.TO.W.0002.230820T2237Z-230820T2300Z/

BULLETIN - EAS ACTIVATION REQUESTED
Tornado Warning
National Weather Service San Diego CA
337 PM PDT Sun Aug 20 2023

The National Weather Service in San Diego has issued a

* Tornado Warning for...
  South central San Diego County in southwestern California...

* Until 400 PM PDT.
    
* At 337 PM PDT, a severe thunderstorm capable of producing a tornado
  was located near Alpine, moving north at 20 mph.

  HAZARD...Tornado.

  SOURCE...Radar indicated rotation.

  IMPACT...Flying debris will be dangerous to those caught without 
           shelter. Mobile homes will be damaged or destroyed. 
           Damage to roofs, windows, and vehicles will occur.  Tree 
           damage is likely.

* Locations impacted include...
  Alpine, Cuyamaca Rancho State Park, Descanso, Skye Valley, Captain
  Grande Indian Reservation, Viejas Indian Reservation, Japatul
  Valley, Boulder Creek, Barrett Lake, Guatay, and Jamul.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

TAKE COVER NOW! Move to a basement or an interior room on the lowest
floor of a sturdy building. Avoid windows. If you are outdoors, in a
mobile home, or in a vehicle, move to the closest substantial shelter
and protect yourself from flying debris.

&&

LAT...LON 3271 11666 3274 11680 3295 11677 3293 11654
TIME...MOT...LOC 2237Z 196DEG 17KT 3281 11671 

TORNADO...RADAR INDICATED
MAX HAIL SIZE...<.75 IN

$$

EA

2 follow-up statements

570 
WWUS56 KSGX 202243
SVSSGX

Severe Weather Statement
National Weather Service San Diego CA
343 PM PDT Sun Aug 20 2023

CAC073-202300-
/O.CON.KSGX.TO.W.0002.000000T0000Z-230820T2300Z/
San Diego CA-
343 PM PDT Sun Aug 20 2023

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 400 PM PDT FOR CENTRAL
SAN DIEGO COUNTY...
    
At 343 PM PDT, a severe thunderstorm capable of producing a tornado
was located near Alpine, moving north at 20 mph.

HAZARD...Tornado.

SOURCE...Radar indicated rotation.

IMPACT...Flying debris will be dangerous to those caught without 
         shelter. Mobile homes will be damaged or destroyed. Damage 
         to roofs, windows, and vehicles will occur.  Tree damage is 
         likely.

Locations impacted include...
Alpine, Cuyamaca Rancho State Park, Descanso, Captain Grande Indian
Reservation, Viejas Indian Reservation, Japatul Valley, and Boulder
Creek.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

TAKE COVER NOW! Move to a basement or an interior room on the lowest
floor of a sturdy building. Avoid windows. If you are outdoors, in a
mobile home, or in a vehicle, move to the closest substantial shelter
and protect yourself from flying debris.

&&

LAT...LON 3278 11666 3280 11676 3295 11677 3293 11654
TIME...MOT...LOC 2243Z 196DEG 17KT 3284 11670 

TORNADO...RADAR INDICATED
MAX HAIL SIZE...<.75 IN

$$

EA

866 
WWUS56 KSGX 202254
SVSSGX

Severe Weather Statement
National Weather Service San Diego CA
354 PM PDT Sun Aug 20 2023

CAC073-202304-
/O.EXP.KSGX.TO.W.0002.000000T0000Z-230820T2300Z/
San Diego CA-
354 PM PDT Sun Aug 20 2023

...THE TORNADO WARNING FOR CENTRAL SAN DIEGO COUNTY WILL EXPIRE AT
400 PM PDT...
                
The storm which prompted the warning has weakened below severe
limits, and no longer appears capable of producing a tornado.
Therefore, the warning will be allowed to expire.

LAT...LON 3278 11666 3280 11676 3295 11677 3293 11654
TIME...MOT...LOC 2254Z 196DEG 17KT 3288 11669 

$$

EA

The office that day

Everything else NWS San Diego, CA issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Aug 20, 8:00 AM PDT	Areal Flood Advisory	SGX	San Bernardino	12 hr
Aug 20, 8:16 AM PDT	Areal Flood Advisory	SGX	Orange, Riverside, San Bernardino	2 hr
Aug 20, 8:53 AM PDT	Areal Flood Advisory	SGX	San Bernardino	2 hr
Aug 20, 11:04 AM PDT	Areal Flood Advisory	SGX	San Bernardino	9 hr
Aug 20, 11:17 AM PDT	Areal Flood Advisory	SGX	San Diego	6 hr
Aug 20, 11:25 AM PDT	Flash Flood Warning Considerable damage threat	SGX	San Diego	3 hr
Aug 20, 12:48 PM PDT	Flash Flood Warning Considerable damage threat	SGX	San Diego	3 hr
Aug 20, 1:04 PM PDT	Flash Flood Warning Considerable damage threat	SGX	San Diego	3 hr
Aug 20, 1:07 PM PDT	Severe Thunderstorm Warning	SGX	Riverside, San Diego	38 min
Aug 20, 1:20 PM PDT	Areal Flood Advisory	SGX	Riverside	4 hr
Aug 20, 1:40 PM PDT	Flash Flood Warning Considerable damage threat	SGX	Riverside	10 hr
Aug 20, 1:51 PM PDT	Flash Flood Warning Considerable damage threat	SGX	Riverside	10 hr
Aug 20, 2:21 PM PDT	Areal Flood Advisory	SGX	Riverside, San Bernardino	4 hr
Aug 20, 2:58 PM PDT	Flash Flood Warning Considerable damage threat	SGX	Riverside, San Bernardino	5 hr
Aug 20, 3:11 PM PDT	Areal Flood Advisory	SGX	Orange, San Diego	2 hr
Aug 20, 3:46 PM PDT	Flash Flood Warning Considerable damage threat	SGX	San Diego	74 min
Aug 20, 4:05 PM PDT	Areal Flood Advisory	SGX	Orange, Riverside, San Bernardino	2 hr

Nearby

Tornado Warnings in California, 2023 Every tornado warning in 2023 Tornadoes in 2023

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.