Alert archive / California / Severe Thunderstorm Warnings in 2021
Severe Thunderstorm Warning 15, NWS San Diego, CA
NWS San Diego, CA issued this severe thunderstorm warning at Sep 24, 2021, 3:20 PM PDT for San Diego County, California. It was in force for 55 min. 2 reports came from inside the area while it was in force.
The area
The outline as issued, with what was reported inside it.
The facts
- Issued
- Sep 24, 2021, 3:20 PM PDT (22:20 UTC)
- Expired
- Sep 24, 2021, 4:15 PM PDT
- In force
- 55 min
- Issued by
- NWS San Diego, CA
- Area
- Storm-based polygon
- Hail
- 0.75 in
- Wind
- 60.0 mph
County San Diego County, CA
The radar
The San Diego radar (KNKX), 23 km from the middle of the area, began a volume at 22:22 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.
What was reported inside it
| Time | Report | Where | Remark |
|---|---|---|---|
| Sep 24, 3:30 PM PDT | TSTM WND DMG | 1 Se La Mesa, CA | NBC AND CBS REPORTED LARGE 70 FOOT PINE TREE THAT WAS DOWNED ON A HOME AND DAMAGED A GARAGE AS WELL AS DOWNED A POWER LINE. SMALLER TREE DOWN IN THE SAME AREA. 4500 PANORAMA DRIVE. |
| Sep 24, 3:50 PM PDT | HAIL 0.25 | 3 Nne San Diego, CA | 2 MPING REPORTS OF PEA SIZED HAIL. |
Local storm reports filed while the alert was in force, from inside its polygon or its counties.
The nearest sounding before it
San Diego, CA (KNKX), launched 12:00Z, 10.3 hours before the alert went out and 10 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
- 1990 m above ground
- 0-6 km bulk shear
- 4 kt
- 0-1 km storm-relative helicity
- -36 m²/s²
- 0-3 km storm-relative helicity
- 15 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
735
WUUS56 KSGX 242220
SVRSGX
CAC073-242315-
/O.NEW.KSGX.SV.W.0015.210924T2220Z-210924T2315Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service San Diego CA
320 PM PDT Fri Sep 24 2021
The National Weather Service in San Diego has issued a
* Severe Thunderstorm Warning for...
Southwestern San Diego County in southwestern California...
* Until 415 PM PDT.
* At 319 PM PDT, a severe thunderstorm was located over Lakeside, or
near El Cajon, moving west at about 15 mph.
HAZARD...60 mph wind gusts.
SOURCE...Radar indicated.
IMPACT...Expect damage to roofs, siding, and trees.
* Locations impacted include...
Chula Vista, Oceanside, Carlsbad, El Cajon, Vista, Encinitas,
National City, La Mesa, Poway and Imperial Beach.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
&&
LAT...LON 3261 11714 3260 11710 3266 11713 3269 11714
3262 11713 3264 11714 3269 11720 3271 11720
3268 11716 3269 11715 3273 11721 3297 11726
3316 11735 3319 11696 3257 11682 3256 11713
TIME...MOT...LOC 2219Z 239DEG 49KT 3287 11688
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...<.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH
$$
Small2 follow-up statements
386
WWUS56 KSGX 242245
SVSSGX
Severe Weather Statement
National Weather Service San Diego CA
345 PM PDT Fri Sep 24 2021
CAC073-242315-
/O.CON.KSGX.SV.W.0015.000000T0000Z-210924T2315Z/
San Diego CA-
345 PM PDT Fri Sep 24 2021
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 415 PM PDT
FOR SOUTHWESTERN SAN DIEGO COUNTY...
At 339 PM PDT, a severe thunderstorm was located near downtown San
Diego, moving west at about 15 mph. So far heavy rainfall and
localized flooding has been reported.
HAZARD...60 mph wind gusts.
SOURCE...Radar indicated.
IMPACT...Expect damage to roofs, siding, and trees.
Locations impacted include...
Chula Vista, Oceanside, Carlsbad, El Cajon, Vista, Encinitas,
National City, La Mesa, Poway and Imperial Beach.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
&&
LAT...LON 3261 11714 3260 11710 3266 11713 3269 11714
3262 11713 3264 11714 3269 11720 3271 11720
3268 11716 3269 11715 3273 11721 3297 11726
3316 11735 3319 11696 3257 11682 3256 11713
TIME...MOT...LOC 2239Z 239DEG 49KT 3301 11659
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...<.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH
$$
Small419
WWUS56 KSGX 242312
SVSSGX
Severe Weather Statement
National Weather Service San Diego CA
412 PM PDT Fri Sep 24 2021
CAC073-242320-
/O.EXP.KSGX.SV.W.0015.000000T0000Z-210924T2315Z/
San Diego CA-
412 PM PDT Fri Sep 24 2021
...THE SEVERE THUNDERSTORM WARNING FOR SOUTHWESTERN SAN DIEGO COUNTY
WILL EXPIRE AT 415 PM PDT...
The severe thunderstorm which prompted the warning has weakened
and moved out of the warned area. Therefore, the warning will be
allowed to expire.
LAT...LON 3261 11714 3260 11710 3266 11713 3269 11714
3262 11713 3264 11714 3269 11720 3271 11720
3268 11716 3269 11715 3273 11721 3297 11726
3316 11735 3319 11696 3257 11682 3256 11713
TIME...MOT...LOC 2310Z 239DEG 49KT 3316 11630
$$
SmallThe office that day
Everything else NWS San Diego, CA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Sep 24, 8:56 AM PDT | Flash Flood Watch | SGX | Riverside, San Diego | 10 hr |
| Sep 24, 11:08 AM PDT | Beach Hazards Statement | SGX | Orange, San Diego | 8 hr |
| Sep 24, 12:13 PM PDT | Severe Thunderstorm Warning | SGX | San Diego | 31 min |
| Sep 24, 12:21 PM PDT | Flash Flood Warning | SGX | San Diego | 56 min |
| Sep 24, 1:24 PM PDT | Severe Thunderstorm Warning | SGX | San Diego | 51 min |
| Sep 24, 1:28 PM PDT | Flash Flood Warning | SGX | San Diego | 2 hr |
| Sep 24, 2:09 PM PDT | Flash Flood Warning | SGX | San Diego | 3 hr |
| Sep 24, 2:41 PM PDT | Severe Thunderstorm Warning | SGX | San Diego | 64 min |
| Sep 24, 2:59 PM PDT | Special Weather Statement | SGX | San Diego | 61 min |
| Sep 24, 3:14 PM PDT | Special Marine Warning | SGX | 91 min | |
| Sep 24, 3:47 PM PDT | Special Weather Statement | SGX | Orange | 58 min |
| Sep 24, 3:56 PM PDT | Special Marine Warning | SGX | 94 min | |
| Sep 24, 4:40 PM PDT | Special Marine Warning | SGX | 65 min |
Nearby
Severe Thunderstorm Warnings in California, 2021Every severe thunderstorm warning in 2021
Sources
The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.