Alert archive / California / Special Weather Statements in 2021

Special Weather Statement, NWS Phoenix, AZ

August 10, 2021Imperial County, California

NWS Phoenix, AZ issued this special weather statement at Aug 10, 2021, 11:16 PM PDT for Imperial County, California. It was in force for 74 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 10, 2021, 11:16 PM PDT (06:16 UTC)
Expired: Aug 11, 2021, 12:30 AM PDT
In force: 74 min
Issued by: NWS Phoenix, AZ
Hail: 0.00 in
Wind: 50

County Imperial County, CA

The radar

The San Diego radar (KNKX), 120 km from the middle of the area, began a volume at 06:19 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, 6.3 hours before the alert went out and 139 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.

Skew-T log-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.

Mixed-layer CAPE: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 3091 m above ground
0-6 km bulk shear: 16 kt
0-1 km storm-relative helicity: 21 m²/s²
0-3 km storm-relative helicity: 54 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

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What forecasters said that day

The local office's own words before this special weather statement went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Phoenix, AZ wrote its last area forecast discussion before this special weather statement went out at Aug 10, 10:05 PM PDT, 1 hour 11 minutes earlier.

Area forecast discussion, Aug 10, 10:05 PM PDT, 1 hour 11 minutes before

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In the hours before

Special weather statement, Aug 10, 9:23 PM PDT, 1 hour 53 minutes before

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Local storm report, Aug 10, 9:24 PM PDT, 1 hour 52 minutes before

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Local storm report, Aug 10, 9:30 PM PDT, 1 hour 46 minutes before

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Local storm report, Aug 10, 10:09 PM PDT, 1 hour 7 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE PHOENIX AZ
1009 PM MST TUE AUG 10 2021

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0305 PM     FLASH FLOOD      2 N QUARTZSITE          33.70N 114.22W
08/10/2021                   LA PAZ             AZ   LAW ENFORCEMENT

            STATE ROUTE 95 AT MILEPOST 111 NORTH OF
            QUARTZSITE WAS CLOSED DUE TO FLOODING. TIME
            BASED ON REPORT TO LA PAZ COUNTY SHERIFFS
            DISPATCH.

&&

AJ

Local storm report, Aug 10, 10:48 PM PDT, 28 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE PHOENIX AZ
1048 PM MST TUE AUG 10 2021

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

1040 PM     TSTM WND GST     1 WSW IMPERIAL          32.83N 115.57W
08/10/2021  M45 MPH          IMPERIAL           CA   ASOS

            IMPERIAL AIRPORT ASOS REPORTED A PEAK GUST
            OF 45 MPH AT 1040PM WITH A VISIBILITY OF 1.5
            MILES. AT 1033PM THE VISIBILITY WAS 1.25
            MILES.

&&

AJ

Special weather statement, Aug 10, 11:16 PM PDT, 0 minutes before

Special Weather Statement
National Weather Service Phoenix AZ
1116 PM PDT Tue Aug 10 2021

CAZ562>568-570-110730-
Chuckwalla Mountains CA-Imperial County West CA-
Imperial County Southeast CA-Salton Sea CA-
Imperial County Southwest CA-Chuckwalla Valley CA-Imperial Valley CA-
Chiriaco Summit CA-
1116 PM PDT Tue Aug 10 2021

...A strong thunderstorm will impact portions of Imperial and
Riverside Counties through 1230 AM PDT...

At 1115 PM PDT, Doppler radar was tracking a strong thunderstorm 18
miles southwest of Mt. Signal, or 23 miles southwest of Calexico,
moving south at 30 mph. Strong winds in the wake of this
thunderstorm persist across portions of Imperial County.

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...
El Centro, Calexico, Brawley, Imperial, Chiriaco Summit, Plaster
City, Salton City, Desert Center, Ocotillo, Holtville, Westmorland,
North Shore, Salton Sea Beach, Desert Shores, Bombay Beach, Mt.
Signal, Mountain Spring, El Centro Naval Airfield, Ocotillo Wells and
Calipatria.

This includes the following highways...
CA Interstate 10 between mile markers 74 and 118.
CA Interstate 8 between mile markers 1 and 63.
CA Route 78 between mile markers 1 and 36.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If outdoors, consider seeking shelter inside a building.

&&

LAT...LON 3342 11608 3343 11603 3350 11608 3352 11605
      3352 11595 3372 11594 3373 11518 3269 11513
      3262 11611
TIME...MOT...LOC 0615Z 014DEG 26KT 3244 11578

MAX HAIL SIZE...0.00 IN
MAX WIND GUST...50 MPH

Hirsch

The office that day

Everything else NWS Phoenix, AZ issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Aug 10, 5:23 PM PDT	Areal Flood Advisory	PSR	Maricopa	3 hr
Aug 10, 5:35 PM PDT	Special Weather Statement	PSR		40 min
Aug 10, 5:51 PM PDT	Areal Flood Advisory	PSR	La Paz	3 hr
Aug 10, 5:55 PM PDT	Special Weather Statement	PSR	La Paz	50 min
Aug 10, 6:30 PM PDT	Severe Thunderstorm Warning	PSR	La Paz, Yuma	45 min
Aug 10, 6:36 PM PDT	Flash Flood Warning Considerable damage threat	PSR	La Paz, Maricopa	4 hr
Aug 10, 7:15 PM PDT	Dust Storm Warning	PSR	La Paz, Yuma	60 min
Aug 10, 7:26 PM PDT	Severe Thunderstorm Warning	PSR	La Paz, Maricopa, Yuma	49 min
Aug 10, 7:33 PM PDT	Flash Flood Warning Considerable damage threat	PSR	La Paz, Yuma	4 hr
Aug 10, 7:43 PM PDT	Dust Storm Advisory	PSR	Maricopa, Pinal, Yuma	62 min
Aug 10, 8:18 PM PDT	Severe Thunderstorm Warning	PSR	La Paz, Yuma	57 min
Aug 10, 8:38 PM PDT	Dust Storm Warning	PSR	La Paz, Yuma	52 min
Aug 10, 9:08 PM PDT	Flash Flood Warning Considerable damage threat	PSR	La Paz, Yuma	6 hr
Aug 10, 9:12 PM PDT	Flash Flood Warning Considerable damage threat	PSR	Maricopa, Yuma	6 hr
Aug 10, 9:23 PM PDT	Special Weather Statement	PSR	Yuma	97 min
Aug 10, 9:42 PM PDT	Dust Storm Warning	PSR	Yuma	93 min
Aug 10, 10:35 PM PDT	Flash Flood Warning Considerable damage threat	PSR	La Paz, Maricopa, Yuma	6 hr
Aug 11, 12:01 AM PDT	Flash Flood Warning Considerable damage threat	PSR	La Paz, Yuma	5 hr
Aug 11, 2:00 AM PDT	Areal Flood Advisory	PSR	Gila	3 hr
Aug 11, 3:29 AM PDT	Areal Flood Advisory	PSR	Maricopa	3 hr
Aug 11, 4:33 AM PDT	Areal Flood Advisory	PSR	Maricopa, Pinal	3 hr
Aug 11, 6:06 AM PDT	Areal Flood Advisory	PSR	Maricopa	3 hr
Aug 11, 6:11 AM PDT	Areal Flood Advisory	PSR	Maricopa, Pinal	3 hr
Aug 11, 6:15 AM PDT	Areal Flood Advisory	PSR	Gila, Maricopa	3 hr
Aug 11, 7:30 AM PDT	Flash Flood Warning Considerable damage threat	PSR	Gila, Maricopa	6 hr
Aug 11, 7:46 AM PDT	Areal Flood Advisory	PSR	Maricopa, Pinal	3 hr
Aug 11, 8:12 AM PDT	Flash Flood Warning Considerable damage threat	PSR	Maricopa, Pinal	6 hr
Aug 11, 9:13 AM PDT	Areal Flood Advisory	PSR	Maricopa	3 hr
Aug 11, 1:01 PM PDT	Special Weather Statement	PSR	Yuma	59 min
Aug 11, 1:29 PM PDT	Areal Flood Warning	PSR	Maricopa	6 hr
Aug 11, 1:43 PM PDT	Areal Flood Warning	PSR	Gila	4 hr
Aug 11, 1:49 PM PDT	Areal Flood Advisory	PSR	Yuma	3 hr
Aug 11, 2:01 PM PDT	Dust Storm Advisory	PSR	Yuma	59 min
Aug 11, 2:17 PM PDT	Severe Thunderstorm Warning	PSR	Yuma	43 min
Aug 11, 3:02 PM PDT	Flash Flood Warning Considerable damage threat	PSR	Yuma	4 hr
Aug 11, 3:11 PM PDT	Special Weather Statement	PSR		64 min
Aug 11, 3:29 PM PDT	Special Weather Statement	PSR	Maricopa	46 min
Aug 11, 3:34 PM PDT	Special Weather Statement	PSR		56 min
Aug 11, 3:44 PM PDT	Areal Flood Advisory	PSR	Maricopa	3 hr
Aug 11, 3:47 PM PDT	Areal Flood Advisory	PSR	Maricopa	14 min
Aug 11, 3:50 PM PDT	Areal Flood Advisory	PSR	Maricopa	3 hr
Aug 11, 4:01 PM PDT	Flash Flood Warning Considerable damage threat	PSR	Maricopa	3 hr
Aug 11, 4:33 PM PDT	Areal Flood Advisory	PSR	Maricopa	3 hr
Aug 11, 4:44 PM PDT	Dust Storm Advisory	PSR	Maricopa, Pinal	61 min
Aug 11, 4:56 PM PDT	Flash Flood Warning Considerable damage threat	PSR	Maricopa	3 hr
Aug 10, 9:54 PM PDT	Flash Flood Warning Considerable damage threat	PSR	Riverside	86 min

Nearby

Special Weather Statements in California, 2021 Every 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.