Alert archive / Arizona / Special Weather Statements in 2021

Special Weather Statement, NWS Phoenix, AZ

July 30, 2021Maricopa County, Arizona

NWS Phoenix, AZ issued this special weather statement at Jul 30, 2021, 11:54 PM MST for Maricopa County, Arizona. It was in force for 51 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, 11:54 PM MST (06:54 UTC)
Expired: Jul 31, 2021, 12:45 AM MST
In force: 51 min
Issued by: NWS Phoenix, AZ

County Maricopa County, AZ

The radar

The Phoenix radar (KIWA), 53 km from the middle of the area, began a volume at 06:56 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

Phoenix, AZ (KPSR), launched 00:00Z, 6.9 hours before the alert went out and 22 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: 50 J/kg
Mixed-layer CIN: -40 J/kg
Mixed-layer LCL: 3059 m above ground
0-6 km bulk shear: 5 kt
0-1 km storm-relative helicity: 1 m²/s²
0-3 km storm-relative helicity: 43 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 Jul 30, 11:51 PM MST, 3 minutes earlier.

Area forecast discussion, Jul 30, 11:51 PM MST, 3 minutes before

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In the hours before

Local storm report, Jul 30, 10:34 PM MST, 1 hour 20 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE PHOENIX AZ
1034 PM MST FRI JUL 30 2021

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

0849 PM     TSTM WND DMG     12 W TONOPAH            33.53N 113.13W
07/30/2021                   MARICOPA           AZ   LAW ENFORCEMENT

            ***DELAYED REPORT*** FOUR TRACTOR TRAILERS
            BLOWN OVER ON I-10 WEST OF TONOPAH.

&&

INS

Special weather statement, Jul 30, 10:37 PM MST, 1 hour 17 minutes before

Special Weather Statement
National Weather Service Phoenix AZ
1037 PM MST Fri Jul 30 2021

AZZ541>544-546-548-549-310600-
Fountain Hills/East Mesa AZ-Scottsdale/Paradise Valley AZ-
Cave Creek/New River AZ-East Valley AZ-Central Phoenix AZ-
Deer Valley AZ-North Phoenix/Glendale AZ-
1037 PM MST Fri Jul 30 2021

...SIGNIFICANT WEATHER ADVISORY FOR MARICOPA COUNTY UNTIL 1100 PM
MST...

At 1036 PM MST, Doppler radar was tracking a strong thunderstorm over
Salt River Indian Community, or near Paradise Valley, moving
northwest at 25 mph.

Wind gusts up to 50 mph will be possible with this storm.

Locations impacted include...
Phoenix, Mesa, Chandler, Scottsdale, Gilbert, Tempe, Paradise Valley,
Tempe Marketplace, Papago Park, Piestewa Peak Park, Falcon Field
Airport, Salt River Indian Community, Arizona State Fairgrounds,
Freestone Park, Downtown Scottsdale, Fiesta Mall, Scottsdale Airport,
Camelback Mountain, Sky Harbor Airport and Mesa Riverview Mall.

This includes the following highways...
AZ Interstate 10 between mile markers 143 and 155.
AZ Interstate 17 near mile marker 195, and between mile markers 201
and 204.
AZ Route 51 between mile markers 1 and 10.

LAT...LON 3349 11170 3329 11179 3348 11215 3368 11191
TIME...MOT...LOC 0536Z 129DEG 21KT 3348 11187

Rogers

Special weather statement, Jul 30, 10:45 PM MST, 1 hour 9 minutes before

Special Weather Statement
National Weather Service Phoenix AZ
1045 PM MST Fri Jul 30 2021

AZZ553-554-559-310630-
Sonoran Desert Natl Monument AZ-Northwest Pinal County AZ-
West Pinal County AZ-
1045 PM MST Fri Jul 30 2021

...SIGNIFICANT WEATHER ADVISORY FOR MARICOPA AND PINAL COUNTIES UNTIL
1130 PM MST...

At 1045 PM MST, Doppler radar was tracking a strong thunderstorm 10
miles west of Casa Grande, moving northwest at 20 mph.

Wind gusts of 50 to 55 mph will be possible with this storm.

Locations impacted include...
Maricopa, Stanfield and Ak-Chin Village.

This includes the following highways...
AZ Interstate 8 between mile markers 146 and 167.
AZ Route 238 between mile markers 38 and 44.
AZ Route 347 between mile markers 161 and 175.

LAT...LON 3299 11227 3312 11210 3295 11181 3277 11188
      3276 11205 3273 11205 3272 11207 3272 11214
      3268 11215 3268 11220
TIME...MOT...LOC 0545Z 126DEG 15KT 3293 11192

Rogers

Local storm report, Jul 30, 11:08 PM MST, 46 minutes before

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Local storm report, Jul 30, 11:51 PM MST, 3 minutes before

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Special weather statement, Jul 30, 11:54 PM MST, 0 minutes before

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The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 30, 5:04 PM MST	Dust Storm Advisory	PSR	Yuma	41 min
Jul 30, 5:29 PM MST	Severe Thunderstorm Warning	PSR	Yuma	46 min
Jul 30, 5:39 PM MST	Areal Flood Advisory	PSR	Yuma	3 hr
Jul 30, 5:44 PM MST	Flash Flood Warning Considerable damage threat	PSR	Yuma	4 hr
Jul 30, 5:59 PM MST	Dust Storm Warning	PSR	Yuma	45 min
Jul 30, 6:06 PM MST	Flash Flood Warning Considerable damage threat	PSR	Yuma	4 hr
Jul 30, 6:51 PM MST	Severe Thunderstorm Warning	PSR	Yuma	38 min
Jul 30, 7:06 PM MST	Special Weather Statement	PSR	Pinal	24 min
Jul 30, 7:25 PM MST	Flash Flood Warning Considerable damage threat	PSR	Yuma	3 hr
Jul 30, 7:32 PM MST	Areal Flood Advisory	PSR	Yuma	3 hr
Jul 30, 7:51 PM MST	Special Weather Statement	PSR	Yuma	69 min
Jul 30, 8:02 PM MST	Areal Flood Advisory	PSR	Maricopa	3 hr
Jul 30, 8:29 PM MST	Dust Storm Advisory	PSR	Maricopa, Pinal	72 min
Jul 30, 8:44 PM MST	Severe Thunderstorm Warning	PSR	La Paz, Maricopa	61 min
Jul 30, 9:17 PM MST	Flash Flood Warning Considerable damage threat	PSR	Maricopa	2 hr
Jul 30, 9:40 PM MST	Special Weather Statement	PSR	Maricopa	65 min
Jul 30, 10:24 PM MST	Dust Storm Advisory	PSR	Maricopa, Pinal	43 min
Jul 30, 10:37 PM MST	Special Weather Statement	PSR	Maricopa	23 min
Jul 30, 10:45 PM MST	Special Weather Statement	PSR		45 min
Jul 31, 12:37 AM MST	Areal Flood Advisory	PSR	Maricopa	3 hr
Jul 31, 1:34 AM MST	Areal Flood Advisory	PSR	Maricopa	4 hr
Jul 31, 1:58 AM MST	Areal Flood Advisory	PSR	Maricopa, Pinal	4 hr
Jul 31, 3:39 AM MST	Areal Flood Advisory	PSR	La Paz	4 hr
Jul 31, 2:23 PM MST	Special Weather Statement	PSR	La Paz	37 min
Jul 31, 3:03 PM MST	Special Weather Statement	PSR	Gila	27 min
Jul 31, 3:18 PM MST	Special Weather Statement	PSR	La Paz	27 min
Jul 31, 3:31 PM MST	Flash Flood Warning Considerable damage threat	PSR	Gila	4 hr
Jul 31, 3:44 PM MST	Special Weather Statement	PSR	La Paz	31 min
Jul 31, 3:55 PM MST	Areal Flood Advisory	PSR	La Paz	3 hr
Jul 30, 5:18 PM MST	Special Weather Statement	PSR	Imperial	72 min
Jul 30, 5:20 PM MST	Special Weather Statement	PSR	Riverside	70 min
Jul 30, 5:24 PM MST	Flash Flood Warning Considerable damage threat	PSR	Riverside	4 hr
Jul 30, 5:33 PM MST	Flash Flood Warning Considerable damage threat	PSR	Imperial	4 hr
Jul 30, 5:52 PM MST	Flash Flood Warning Considerable damage threat	PSR	Riverside	4 hr
Jul 30, 6:11 PM MST	Severe Thunderstorm Warning	PSR	Riverside	79 min
Jul 30, 6:31 PM MST	Special Weather Statement	PSR	Imperial	74 min
Jul 30, 6:49 PM MST	Flash Flood Warning Considerable damage threat	PSR	Imperial, Riverside	4 hr
Jul 31, 2:32 PM MST	Special Weather Statement	PSR	Riverside	28 min
Jul 31, 3:47 PM MST	Special Weather Statement	PSR	Riverside	28 min
Jul 31, 4:48 PM MST	Flash Flood Warning Considerable damage threat	PSR	Riverside	3 hr

Nearby

Special Weather Statements in Arizona, 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.