Alert archive / California / Severe Thunderstorm Warnings in 2021
Severe Thunderstorm Warning 41, NWS Phoenix, AZ
NWS Phoenix, AZ issued this severe thunderstorm warning at Jul 30, 2021, 6:11 PM PDT for Riverside County, California. It was in force for 79 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
- Jul 30, 2021, 6:11 PM PDT (01:11 UTC)
- Expired
- Jul 30, 2021, 7:30 PM PDT
- In force
- 79 min
- Issued by
- NWS Phoenix, AZ
- Area
- Storm-based polygon
- Hail
- 1.0 in
- Wind
- 60.0 mph
County Riverside County, CA
The radar
The San Diego radar (KNKX), 156 km from the middle of the area, began a volume at 01:13 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 00:00Z, 1.2 hours before the alert went out and 175 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
- 2564 m above ground
- 0-6 km bulk shear
- 10 kt
- 0-1 km storm-relative helicity
- -18 m²/s²
- 0-3 km storm-relative helicity
- 33 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
868
WUUS55 KPSR 310111
SVRPSR
CAC065-310230-
/O.NEW.KPSR.SV.W.0041.210731T0111Z-210731T0230Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Phoenix AZ
611 PM PDT Fri Jul 30 2021
The National Weather Service in Phoenix has issued a
* Severe Thunderstorm Warning for...
Riverside County in southern California...
* Until 730 PM PDT.
* At 611 PM PDT, a severe thunderstorm was located near Chiriaco
Summit, moving southeast at 15 mph.
HAZARD...60 mph wind gusts and quarter size hail.
SOURCE...Radar indicated.
IMPACT...Hail damage to vehicles is expected. Expect wind damage
to roofs, siding, and trees.
* Locations impacted include...
Desert Center and Chiriaco Summit.
* This includes the following highways...
CA Interstate 10 between mile markers 81 and 112.
CA Route 177 between mile markers 1 and 5.
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 3362 11583 3384 11575 3375 11524 3343 11542
TIME...MOT...LOC 0111Z 293DEG 13KT 3367 11565
HAIL...1.00IN
WIND...60MPH
$$
Hirsch2 follow-up statements
401
WWUS55 KPSR 310134
SVSPSR
Severe Weather Statement
National Weather Service Phoenix AZ
634 PM PDT Fri Jul 30 2021
CAC065-310230-
/O.CON.KPSR.SV.W.0041.000000T0000Z-210731T0230Z/
Riverside CA-
634 PM PDT Fri Jul 30 2021
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 730 PM PDT
FOR RIVERSIDE COUNTY...
At 634 PM PDT, a severe thunderstorm was located 8 miles east of
Chiriaco Summit, moving southeast at 15 mph.
HAZARD...60 mph wind gusts and quarter size hail.
SOURCE...Radar indicated.
IMPACT...Hail damage to vehicles is expected. Expect wind damage to
roofs, siding, and trees.
Locations impacted include...
Desert Center and Chiriaco Summit.
This includes the following highways...
CA Interstate 10 between mile markers 81 and 112.
CA Route 177 between mile markers 1 and 5.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
Torrential rainfall is occurring with this storm, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.
&&
LAT...LON 3362 11583 3384 11575 3375 11524 3343 11542
TIME...MOT...LOC 0134Z 293DEG 13KT 3364 11557
HAIL...1.00IN
WIND...60MPH
$$
Hirsch173
WWUS55 KPSR 310226
SVSPSR
Severe Weather Statement
National Weather Service Phoenix AZ
726 PM PDT Fri Jul 30 2021
CAC065-310235-
/O.EXP.KPSR.SV.W.0041.000000T0000Z-210731T0230Z/
Riverside CA-
726 PM PDT Fri Jul 30 2021
...THE SEVERE THUNDERSTORM WARNING FOR RIVERSIDE COUNTY WILL EXPIRE
AT 730 PM PDT...
The storm which prompted the warning has weakened below severe
limits, and has exited the warned area. Therefore, the warning will
be allowed to expire.
LAT...LON 3362 11583 3384 11575 3375 11524 3343 11542
TIME...MOT...LOC 0225Z 293DEG 13KT 3357 11537
$$
HirschThe office that day
Everything else NWS Phoenix, AZ issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 30, 5:04 PM PDT | Dust Storm Advisory | PSR | Imperial | 41 min |
| Jul 30, 5:18 PM PDT | Special Weather Statement | PSR | Imperial | 72 min |
| Jul 30, 5:20 PM PDT | Special Weather Statement | PSR | Riverside | 70 min |
| Jul 30, 5:24 PM PDT | Flash Flood Warning | PSR | Riverside | 4 hr |
| Jul 30, 5:29 PM PDT | Severe Thunderstorm Warning | PSR | Imperial | 46 min |
| Jul 30, 5:33 PM PDT | Flash Flood Warning | PSR | Imperial | 4 hr |
| Jul 30, 5:39 PM PDT | Areal Flood Advisory | PSR | Imperial | 3 hr |
| Jul 30, 5:52 PM PDT | Flash Flood Warning | PSR | Riverside | 4 hr |
| Jul 30, 5:59 PM PDT | Dust Storm Warning | PSR | Imperial | 45 min |
| Jul 30, 6:06 PM PDT | Flash Flood Warning | PSR | Imperial | 4 hr |
| Jul 30, 6:31 PM PDT | Special Weather Statement | PSR | Imperial | 74 min |
| Jul 30, 6:49 PM PDT | Flash Flood Warning | PSR | Imperial, Riverside | 4 hr |
| Jul 31, 2:32 PM PDT | Special Weather Statement | PSR | Riverside | 28 min |
| Jul 31, 3:47 PM PDT | Special Weather Statement | PSR | Riverside | 28 min |
| Jul 31, 4:48 PM PDT | Flash Flood Warning | PSR | Riverside | 3 hr |
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.