Alert archive / California / Severe Thunderstorm Warnings in 2021
Severe Thunderstorm Warning 5, NWS San Diego, CA
NWS San Diego, CA issued this severe thunderstorm warning at Aug 31, 2021, 4:13 PM PDT for San Diego County, California. It was in force for 62 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 31, 2021, 4:13 PM PDT (23:13 UTC)
- Expired
- Aug 31, 2021, 5:15 PM PDT
- In force
- 62 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), 74 km from the middle of the area, began a volume at 23:15 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, 11.2 hours before the alert went out and 93 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
- 980 m above ground
- 0-6 km bulk shear
- 5 kt
- 0-1 km storm-relative helicity
- -12 m²/s²
- 0-3 km storm-relative helicity
- -16 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
534 WUUS56 KSGX 312313 SVRSGX CAC073-010015- /O.NEW.KSGX.SV.W.0005.210831T2313Z-210901T0015Z/ BULLETIN - IMMEDIATE BROADCAST REQUESTED Severe Thunderstorm Warning National Weather Service San Diego CA 413 PM PDT Tue Aug 31 2021 The National Weather Service in San Diego has issued a * Severe Thunderstorm Warning for... East central San Diego County in southwestern California... * Until 515 PM PDT. * At 413 PM PDT, a severe thunderstorm was located near Hwy 78 Between S2 And Borrego Springs Rd, moving northwest at 5 mph. HAZARD...60 mph wind gusts. SOURCE...Radar indicated. IMPACT...Expect damage to roofs, siding, and trees. * Locations impacted include... Borrego Springs, Hwy 78 Between Borrego Springs Rd And Ocotillo Wells, Hwy S22 Between Ranchita And Borrego Springs and Fish Creek Wash. PRECAUTIONARY/PREPAREDNESS ACTIONS... For your protection move to an interior room on the lowest floor of a building. Torrential rainfall is occurring with this storm, and may lead to flash flooding. Do not drive your vehicle through flooded roadways. && LAT...LON 3305 11620 3300 11632 3324 11649 3331 11623 TIME...MOT...LOC 2313Z 153DEG 6KT 3310 11628 HAIL THREAT...RADAR INDICATED MAX HAIL SIZE...<.75 IN WIND THREAT...RADAR INDICATED MAX WIND GUST...60 MPH $$ Gregoria
3 follow-up statements
218 WWUS56 KSGX 312328 SVSSGX Severe Weather Statement National Weather Service San Diego CA 428 PM PDT Tue Aug 31 2021 CAC073-010015- /O.CON.KSGX.SV.W.0005.000000T0000Z-210901T0015Z/ San Diego CA- 428 PM PDT Tue Aug 31 2021 ...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 515 PM PDT FOR EAST CENTRAL SAN DIEGO COUNTY... At 428 PM PDT, a severe thunderstorm was located 7 miles southeast of Borrego Springs, moving northwest at 5 mph. HAZARD...60 mph wind gusts. SOURCE...Radar indicated. IMPACT...Expect damage to roofs, siding, and trees. Locations impacted include... Borrego Springs, Hwy 78 Between S2 And Borrego Springs Rd, Hwy 78 Between Borrego Springs Rd And Ocotillo Wells, Hwy S22 Between Ranchita And Borrego Springs and Fish Creek Wash. PRECAUTIONARY/PREPAREDNESS ACTIONS... For your protection move to an interior room on the lowest floor of a building. Torrential rainfall is occurring with this storm, and may lead to flash flooding. Do not drive your vehicle through flooded roadways. && LAT...LON 3305 11620 3300 11632 3324 11649 3331 11623 TIME...MOT...LOC 2328Z 153DEG 6KT 3312 11629 HAIL THREAT...RADAR INDICATED MAX HAIL SIZE...<.75 IN WIND THREAT...RADAR INDICATED MAX WIND GUST...60 MPH $$ Gregoria
525 WWUS56 KSGX 312351 SVSSGX Severe Weather Statement National Weather Service San Diego CA 451 PM PDT Tue Aug 31 2021 CAC073-010015- /O.CON.KSGX.SV.W.0005.000000T0000Z-210901T0015Z/ San Diego CA- 451 PM PDT Tue Aug 31 2021 ...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 515 PM PDT FOR EAST CENTRAL SAN DIEGO COUNTY... At 448 PM PDT, a severe thunderstorm was located 11 miles southeast of Borrego Springs. This thunderstorms was nearly stationary and is no longer a risk for Borrego Springs. HAZARD...60 mph wind gusts. SOURCE...Radar indicated. IMPACT...Expect damage to roofs, siding, and trees. Locations impacted include... Hwy 78 Between Borrego Springs Rd And Ocotillo Wells, Borrego Springs and Fish Creek Wash. PRECAUTIONARY/PREPAREDNESS ACTIONS... For your protection move to an interior room on the lowest floor of a building. Torrential rainfall is occurring with this storm, and may lead to flash flooding. Do not drive your vehicle through flooded roadways. && LAT...LON 3305 11620 3300 11632 3313 11641 3320 11622 TIME...MOT...LOC 2348Z 271DEG 1KT 3308 11621 HAIL THREAT...RADAR INDICATED MAX HAIL SIZE...<.75 IN WIND THREAT...RADAR INDICATED MAX WIND GUST...60 MPH $$ Gregoria
113 WWUS56 KSGX 312353 CCA SVSSGX Severe Weather Statement National Weather Service San Diego CA 453 PM PDT Tue Aug 31 2021 CAC073-010015- /O.COR.KSGX.SV.W.0005.000000T0000Z-210901T0015Z/ San Diego CA- 453 PM PDT Tue Aug 31 2021 ...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 515 PM PDT FOR EAST CENTRAL SAN DIEGO COUNTY... At 452 PM PDT, a severe thunderstorm was located 11 miles southeast of Borrego Springs. This thunderstorms was nearly stationary and is no longer a risk for Borrego Springs proper. HAZARD...60 mph wind gusts. SOURCE...Radar indicated. IMPACT...Expect damage to roofs, siding, and trees. Locations impacted include... Hwy 78 Between Borrego Springs Rd And Ocotillo Wells and Fish Creek Wash. PRECAUTIONARY/PREPAREDNESS ACTIONS... For your protection move to an interior room on the lowest floor of a building. Torrential rainfall is occurring with this storm, and may lead to flash flooding. Do not drive your vehicle through flooded roadways. && LAT...LON 3305 11620 3300 11632 3313 11641 3320 11622 TIME...MOT...LOC 2348Z 271DEG 1KT 3308 11621 HAIL THREAT...RADAR INDICATED MAX HAIL SIZE...<.75 IN WIND THREAT...RADAR INDICATED MAX WIND GUST...60 MPH $$ Gregoria
The office that day
Everything else NWS San Diego, CA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 30, 7:58 PM PDT | Special Weather Statement | SGX | Riverside | 47 min |
| Aug 30, 8:18 PM PDT | Flash Flood Warning | SGX | Riverside | 37 min |
| Aug 31, 3:30 PM PDT | Special Weather Statement | SGX | San Diego | 45 min |
| Aug 31, 4:55 PM PDT | Special Weather Statement | 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.