Alert archive / California / Special Weather Statements in 2021
Special Weather Statement, NWS Phoenix, AZ
NWS Phoenix, AZ issued this special weather statement at Sep 9, 2021, 1:21 PM PDT for Riverside County, California. It was in force for 24 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, 1:21 PM PDT (20:21 UTC)
- Expired
- Sep 9, 2021, 1:45 PM PDT
- In force
- 24 min
- Issued by
- NWS Phoenix, AZ
- Hail
- 0.00 in
- Wind
- 50
County Riverside County, CA
The radar
The Yuma radar (KYUX), 161 km from the middle of the area, began a volume at 20:24 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
Yuma Prvg Ground, AZ (K1Y7), launched 12:00Z, 8.4 hours before the alert went out and 174 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
- 658 J/kg
- Mixed-layer CIN
- -411 J/kg
- Mixed-layer LCL
- 2238 m above ground
- 0-6 km bulk shear
- 28 kt
- 0-1 km storm-relative helicity
- 100 m²/s²
- 0-3 km storm-relative helicity
- 132 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.2
The text
As transmitted.
953
WWUS85 KPSR 092021
SPSPSR
Special Weather Statement
National Weather Service Phoenix AZ
121 PM PDT Thu Sep 9 2021
CAZ560-561-564-568-092045-
Chuckwalla Mountains CA-Chiriaco Summit CA-Joshua Tree NP West CA-
Joshua Tree NP East CA-
121 PM PDT Thu Sep 9 2021
...A strong thunderstorm will impact portions of Riverside County
through 145 PM PDT...
At 121 PM PDT, Doppler radar was tracking a strong thunderstorm near
Chiriaco Summit, moving northwest at 20 mph.
HAZARD...Wind gusts up to 50 mph.
SOURCE...Radar indicated.
IMPACT...Gusty winds could knock down tree limbs and blow around
unsecured objects.
Locations impacted include...
Chiriaco Summit and Cottonwood Visitor Center.
This includes CA Interstate 10 between mile markers 85 and 100.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
If outdoors, consider seeking shelter inside a building.
Frequent cloud to ground lightning is occurring with this storm.
Lightning can strike 10 miles away from a thunderstorm. Seek a safe
shelter inside a building or vehicle.
&&
LAT...LON 3371 11547 3369 11548 3369 11545 3368 11544
3359 11562 3373 11587 3387 11572 3387 11558
TIME...MOT...LOC 2021Z 137DEG 16KT 3371 11561
MAX HAIL SIZE...0.00 IN
MAX WIND GUST...50 MPH
$$
INSThe office that day
Everything else NWS Phoenix, AZ issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Sep 9, 1:29 PM PDT | Severe Thunderstorm Warning | PSR | Riverside | 46 min |
| Sep 9, 1:58 PM PDT | Special Weather Statement | PSR | Riverside | 32 min |
| Sep 9, 2:00 PM PDT | Severe Thunderstorm Warning | PSR | Riverside | 45 min |
| Sep 9, 2:31 PM PDT | Special Weather Statement | PSR | Riverside | 29 min |
| Sep 9, 3:42 PM PDT | Special Weather Statement | PSR | Riverside | 33 min |
| Sep 9, 4:15 PM PDT | Special Weather Statement | PSR | Riverside | 45 min |
Nearby
Special Weather Statements in California, 2021Every special weather statement 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.