Alert archive / California / Severe Thunderstorm Warnings in 2021
Severe Thunderstorm Warning 11, NWS San Diego, CA
NWS San Diego, CA issued this severe thunderstorm warning at Sep 9, 2021, 4:35 PM PDT for Riverside County, San Bernardino County, California. It was in force for 55 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, 2021, 4:35 PM PDT (23:35 UTC)
- Expired
- Sep 9, 2021, 5:30 PM PDT
- In force
- 55 min
- Issued by
- NWS San Diego, CA
- Area
- Storm-based polygon
- Hail
- 0.88 in
- Wind
- 60.0 mph
The radar
The Santa Ana Mts radar (KSOX), 59 km from the middle of the area, began a volume at 23:35 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 130 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
- 15 J/kg
- Mixed-layer CIN
- -787 J/kg
- Mixed-layer LCL
- 1710 m above ground
- 0-6 km bulk shear
- 28 kt
- 0-1 km storm-relative helicity
- 44 m²/s²
- 0-3 km storm-relative helicity
- 112 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.1
The text
As transmitted.
960 WUUS56 KSGX 092335 SVRSGX CAC065-071-100030- /O.NEW.KSGX.SV.W.0011.210909T2335Z-210910T0030Z/ BULLETIN - IMMEDIATE BROADCAST REQUESTED Severe Thunderstorm Warning National Weather Service San Diego CA 435 PM PDT Thu Sep 9 2021 The National Weather Service in San Diego has issued a * Severe Thunderstorm Warning for... San Bernardino County in southern California... Riverside County in southern California... * Until 530 PM PDT. * At 434 PM PDT, a severe thunderstorm was located near Beaumont, or 7 miles south of Yucaipa, moving northwest at 20 mph. HAZARD...60 mph wind gusts and nickel size hail. SOURCE...Radar indicated. IMPACT...Expect damage to roofs, siding, and trees. * Locations impacted include... Moreno Valley, Redlands, Yucaipa, Highland, Colton, Beaumont, Banning, Loma Linda, Mentone and Calimesa. PRECAUTIONARY/PREPAREDNESS ACTIONS... For your protection move to an interior room on the lowest floor of a building. && LAT...LON 3391 11688 3384 11695 3399 11726 3414 11712 TIME...MOT...LOC 2334Z 126DEG 17KT 3393 11702 HAIL THREAT...RADAR INDICATED MAX HAIL SIZE...0.88 IN WIND THREAT...RADAR INDICATED MAX WIND GUST...60 MPH $$ Moreland
2 follow-up statements
011 WWUS56 KSGX 100000 SVSSGX Severe Weather Statement National Weather Service San Diego CA 500 PM PDT Thu Sep 9 2021 CAC065-071-100030- /O.CON.KSGX.SV.W.0011.000000T0000Z-210910T0030Z/ San Bernardino CA-Riverside CA- 500 PM PDT Thu Sep 9 2021 ...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 530 PM PDT FOR SAN BERNARDINO AND RIVERSIDE COUNTIES... At 459 PM PDT, a severe thunderstorm was located over Redlands, moving northwest at 20 mph. HAZARD...60 mph wind gusts and nickel size hail. SOURCE...Radar indicated. IMPACT...Expect damage to roofs, siding, and trees. Locations impacted include... Moreno Valley, Redlands, Yucaipa, Highland, Colton, western Beaumont, Loma Linda, Mentone, Calimesa and Cherry Valley. PRECAUTIONARY/PREPAREDNESS ACTIONS... For your protection move to an interior room on the lowest floor of a building. && LAT...LON 3399 11697 3389 11706 3399 11726 3414 11712 TIME...MOT...LOC 2359Z 126DEG 17KT 3401 11715 HAIL THREAT...RADAR INDICATED MAX HAIL SIZE...0.88 IN WIND THREAT...RADAR INDICATED MAX WIND GUST...60 MPH $$ Moreland
435
WWUS56 KSGX 100030
SVSSGX
Severe Weather Statement
National Weather Service San Diego CA
530 PM PDT Thu Sep 9 2021
CAC065-071-100040-
/O.EXP.KSGX.SV.W.0011.000000T0000Z-210910T0030Z/
San Bernardino CA-Riverside CA-
530 PM PDT Thu Sep 9 2021
...THE SEVERE THUNDERSTORM WARNING FOR SAN BERNARDINO AND RIVERSIDE
COUNTIES HAS EXPIRED...
The storm which prompted the warning has weakened below severe
limits, and has exited the warned area. Therefore, the warning has
been allowed to expire.
LAT...LON 3399 11697 3389 11706 3399 11726 3414 11712
TIME...MOT...LOC 0030Z 126DEG 17KT 3408 11726
$$
MorelandThe office that day
Everything else NWS San Diego, CA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Sep 9, 12:40 PM PDT | Special Weather Statement | SGX | 50 min | |
| Sep 9, 1:05 PM PDT | Severe Thunderstorm Warning | SGX | San Bernardino | 40 min |
| Sep 9, 1:19 PM PDT | Severe Thunderstorm Warning | SGX | San Bernardino | 22 min |
| Sep 9, 2:12 PM PDT | Areal Flood Advisory | SGX | San Diego | 3 hr |
| Sep 9, 2:34 PM PDT | Flash Flood Warning | SGX | San Bernardino | 3 hr |
| Sep 9, 2:54 PM PDT | Severe Thunderstorm Warning | SGX | San Bernardino | 66 min |
| Sep 9, 3:10 PM PDT | Severe Thunderstorm Warning | SGX | Riverside, San Bernardino | 50 min |
| Sep 9, 3:25 PM PDT | Special Weather Statement | SGX | 50 min | |
| Sep 9, 3:29 PM PDT | Flash Flood Warning | SGX | Riverside, San Bernardino | 2 hr |
| Sep 9, 3:46 PM PDT | Areal Flood Advisory | SGX | Riverside | 3 hr |
| Sep 9, 4:33 PM PDT | Flash Flood Warning | SGX | Riverside | 88 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.