Alert archive / California / Severe Thunderstorm Warnings in 2021
Severe Thunderstorm Warning 110, NWS Phoenix, AZ
NWS Phoenix, AZ issued this severe thunderstorm warning at Sep 24, 2021, 7:33 AM PDT for Imperial County, California. It was in force for 42 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 24, 2021, 7:33 AM PDT (14:33 UTC)
- Expired
- Sep 24, 2021, 8:15 AM PDT
- In force
- 42 min
- Issued by
- NWS Phoenix, AZ
- Area
- Storm-based polygon
- Hail
- 0.75 in
- Wind
- 60.0 mph
County Imperial County, CA
The radar
The Yuma radar (KYUX), 69 km from the middle of the area, began a volume at 14:35 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, 2.6 hours before the alert went out and 179 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.
888
WUUS55 KPSR 241433
SVRPSR
CAC025-241515-
/O.NEW.KPSR.SV.W.0110.210924T1433Z-210924T1515Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Phoenix AZ
733 AM PDT Fri Sep 24 2021
The National Weather Service in Phoenix has issued a
* Severe Thunderstorm Warning for...
South central Imperial County in southeastern California...
* Until 815 AM PDT.
* At 732 AM PDT, a severe thunderstorm was located near Holtville, or
15 miles east of Imperial, and is nearly stationary.
HAZARD...60 mph wind gusts and penny size hail.
SOURCE...Radar indicated.
IMPACT...Expect damage to roofs, siding, and trees.
* Locations impacted include...
Holtville, Gordon's Well, Bonds Corner, Alamorio and Heber.
This includes the following highways...
CA Interstate 8 between mile markers 41 and 74.
CA Route 78 between mile markers 15 and 35.
CA Route 111 between mile markers 5 and 22.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
Large hail and damaging winds and continuous cloud to ground
lightning is occurring with this storm. Move indoors immediately.
Lightning is one of nature's leading killers. Remember, if you can
hear thunder, you are close enough to be struck by lightning.
Torrential rainfall is occurring with this storm, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.
&&
LAT...LON 3273 11551 3299 11551 3301 11528 3289 11488
3270 11494 3267 11540
TIME...MOT...LOC 1432Z 309DEG 4KT 3284 11529
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...0.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH
$$
INS2 follow-up statements
204
WWUS55 KPSR 241447
SVSPSR
Severe Weather Statement
National Weather Service Phoenix AZ
747 AM PDT Fri Sep 24 2021
CAC025-241515-
/O.CON.KPSR.SV.W.0110.000000T0000Z-210924T1515Z/
Imperial CA-
747 AM PDT Fri Sep 24 2021
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 815 AM PDT
FOR SOUTH CENTRAL IMPERIAL COUNTY...
At 747 AM PDT, a severe thunderstorm was located near Holtville, or
14 miles northeast of Calexico, moving south at 10 mph.
HAZARD...60 mph wind gusts and quarter size hail.
SOURCE...Radar indicated.
IMPACT...Hail damage to vehicles is expected. Expect wind damage to
roofs, siding, and trees.
Locations impacted include...
Holtville, Gordon's Well, Bonds Corner, Alamorio and Heber.
This includes the following highways...
CA Interstate 8 between mile markers 41 and 74.
CA Route 78 between mile markers 15 and 35.
CA Route 111 between mile markers 5 and 22.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
Continuous cloud to ground lightning is occurring with this storm.
Move indoors immediately. Lightning is one of nature's leading
killers. Remember, if you can hear thunder, you are close enough to
be struck by lightning.
Torrential rainfall is occurring with this storm, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.
&&
LAT...LON 3273 11551 3299 11551 3301 11528 3289 11488
3270 11494 3267 11540
TIME...MOT...LOC 1447Z 005DEG 8KT 3280 11531
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.00 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH
$$
INS738
WWUS55 KPSR 241515
SVSPSR
Severe Weather Statement
National Weather Service Phoenix AZ
815 AM PDT Fri Sep 24 2021
CAC025-241525-
/O.EXP.KPSR.SV.W.0110.000000T0000Z-210924T1515Z/
Imperial CA-
815 AM PDT Fri Sep 24 2021
...THE SEVERE THUNDERSTORM WARNING FOR SOUTH CENTRAL IMPERIAL COUNTY
HAS EXPIRED...
The storm which prompted the warning has weakened below severe
limits, and no longer poses an immediate threat to life or property.
Therefore, the warning has been allowed to expire. However gusty
winds and heavy rain are still possible with this thunderstorm.
To report severe weather, contact your nearest law enforcement
agency. They will relay your report to the National Weather Service
in Phoenix.
LAT...LON 3273 11551 3299 11551 3301 11528 3289 11488
3270 11494 3267 11540
TIME...MOT...LOC 1515Z 309DEG 4KT 3278 11528
$$
INSThe office that day
Everything else NWS Phoenix, AZ issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Sep 24, 7:10 AM PDT | Special Weather Statement | PSR | Imperial | 50 min |
| Sep 24, 7:28 AM PDT | Areal Flood Advisory | PSR | Imperial | 46 min |
| Sep 24, 8:00 AM PDT | Special Weather Statement | PSR | Imperial | 45 min |
| Sep 24, 8:14 AM PDT | Flash Flood Warning | PSR | Imperial | 4 hr |
| Sep 24, 8:18 AM PDT | Special Weather Statement | PSR | Imperial | 42 min |
| Sep 24, 9:03 AM PDT | Flash Flood Watch | PSR | Imperial, Riverside, San Bernardino | 10 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.