Alert archive / Arizona / Flash Flood Warnings in 2022

Flash Flood Warning 29, NWS Phoenix, AZ

July 25, 2022Maricopa County, Arizona

NWS Phoenix, AZ issued this flash flood warning at Jul 25, 2022, 11:42 PM MST for Maricopa County, Arizona. It was in force for 4 hr. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued: Jul 25, 2022, 11:42 PM MST (06:42 UTC)
Expired: Jul 26, 2022, 3:45 AM MST
In force: 4 hr
Issued by: NWS Phoenix, AZ
Area: Storm-based polygon
Damage threat: Considerable
Flood severity: None

County Maricopa County, AZ

The radar

The Phoenix radar (KIWA), 77 km from the middle of the area, began a volume at 06:43 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, 6.7 hours before the alert went out and 49 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: 877 J/kg
Mixed-layer CIN: -13 J/kg
Mixed-layer LCL: 1921 m above ground
0-6 km bulk shear: 15 kt
0-1 km storm-relative helicity: -5 m²/s²
0-3 km storm-relative helicity: 16 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

What forecasters said that day

The local office's own words before this flash flood warning 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 flash flood warning went out at Jul 25, 10:22 PM MST, 1 hour 20 minutes earlier.

Area forecast discussion, Jul 25, 10:22 PM MST, 1 hour 20 minutes before

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In the hours before

Special weather statement, Jul 25, 5:56 PM MST, 5 hours 46 minutes before

Special Weather Statement
National Weather Service Phoenix AZ
556 PM PDT Mon Jul 25 2022

CAZ570-260130-
Chuckwalla Valley CA-
556 PM PDT Mon Jul 25 2022

...A strong thunderstorm will impact portions of Riverside County
through 630 PM PDT...

At 555 PM PDT, Doppler radar was tracking a strong thunderstorm 17
miles east of Desert Center. This storm was nearly stationary.

HAZARD...Winds in excess of 40 mph and pea size hail.

SOURCE...Radar indicated.

IMPACT...Gusty winds could knock down tree limbs and blow around
         unsecured objects. Minor damage to outdoor objects is
         possible. Winds may also generate blowing dust which could
         briefly reduce visibilities.

This storm will remain over mainly rural areas of Riverside County.

This includes CA Interstate 10 between mile markers 118 and 130.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If outdoors, consider seeking shelter inside a building.

Torrential rainfall is also occurring with this storm and may lead to
localized flooding. Do not drive your vehicle through flooded
roadways.

&&

LAT...LON 3355 11498 3358 11520 3374 11519 3372 11496
TIME...MOT...LOC 0055Z 172DEG 1KT 3364 11511

MAX HAIL SIZE...0.25 IN
MAX WIND GUST...40 MPH

SDB

Special weather statement, Jul 25, 6:57 PM MST, 4 hours 45 minutes before

Special Weather Statement
National Weather Service Phoenix AZ
657 PM PDT Mon Jul 25 2022

CAZ562-260230-
Imperial County Southwest CA-
657 PM PDT Mon Jul 25 2022

...A strong thunderstorm will impact portions of southwestern
Imperial County through 730 PM PDT...

At 656 PM PDT, Doppler radar was tracking a strong thunderstorm over
Mountain Spring, or near I-8 Between Boulevard And Imperial County
Line. This storm was nearly stationary.

HAZARD...Winds in excess of 40 mph and pea size hail.

SOURCE...Radar indicated.

IMPACT...Gusty winds could knock down tree limbs and blow around
         unsecured objects. Minor damage to outdoor objects is
         possible.

Locations impacted include...
Ocotillo.

This includes CA Interstate 8 near mile marker 1, and between mile
markers 3 and 10.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If outdoors, consider seeking shelter inside a building.

Torrential rainfall is also occurring with this storm and may lead to
localized flooding. Do not drive your vehicle through flooded
roadways.

&&

LAT...LON 3281 11602 3263 11600 3262 11602 3262 11610
      3279 11611 3279 11610
TIME...MOT...LOC 0156Z 165DEG 3KT 3266 11614

MAX HAIL SIZE...0.25 IN
MAX WIND GUST...40 MPH

SDB

Special weather statement, Jul 25, 7:13 PM MST, 4 hours 29 minutes before

Special Weather Statement
National Weather Service Phoenix AZ
713 PM PDT Mon Jul 25 2022

CAZ564-570-260300-
Chuckwalla Mountains CA-Chuckwalla Valley CA-
713 PM PDT Mon Jul 25 2022

...A strong thunderstorm will impact portions of Riverside County
through 800 PM PDT...

At 713 PM PDT, Doppler radar was tracking a strong thunderstorm 20
miles southeast of Desert Center. This storm was nearly stationary.

HAZARD...Winds in excess of 40 mph and pea size hail.

SOURCE...Radar indicated.

IMPACT...Gusty winds could knock down tree limbs and blow around
         unsecured objects. Minor damage to outdoor objects is
         possible.

This storm will remain over mainly rural areas of Riverside County.

This includes CA Interstate 10 between mile markers 117 and 131.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If outdoors, consider seeking shelter inside a building.

Torrential rainfall is also occurring with this storm and may lead to
localized flooding. Do not drive your vehicle through flooded
roadways.

&&

LAT...LON 3349 11497 3346 11518 3367 11529 3367 11497
TIME...MOT...LOC 0213Z 169DEG 1KT 3355 11510

MAX HAIL SIZE...0.25 IN
MAX WIND GUST...40 MPH

SDB

Special weather statement, Jul 25, 7:52 PM MST, 3 hours 50 minutes before

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Special weather statement, Jul 25, 8:35 PM MST, 3 hours 7 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 25, 5:34 PM MST	Special Weather Statement	PSR		41 min
Jul 25, 5:48 PM MST	Areal Flood Advisory	PSR	Maricopa	3 hr
Jul 25, 5:56 PM MST	Special Weather Statement	PSR		34 min
Jul 25, 6:27 PM MST	Areal Flood Advisory	PSR	La Paz	3 hr
Jul 25, 6:57 PM MST	Special Weather Statement	PSR		33 min
Jul 25, 7:10 PM MST	Areal Flood Advisory	PSR	La Paz	13 min
Jul 25, 7:13 PM MST	Special Weather Statement	PSR		47 min
Jul 25, 7:23 PM MST	Flash Flood Warning Considerable damage threat	PSR	La Paz	3 hr
Jul 25, 7:41 PM MST	Areal Flood Advisory	PSR	La Paz	3 hr
Jul 25, 7:52 PM MST	Special Weather Statement	PSR		38 min
Jul 25, 8:00 PM MST	Dust Storm Advisory	PSR	Pinal	60 min
Jul 25, 8:20 PM MST	Areal Flood Advisory	PSR	Maricopa	3 hr
Jul 25, 8:35 PM MST	Special Weather Statement	PSR		25 min
Jul 25, 8:51 PM MST	Areal Flood Advisory	PSR	La Paz	3 hr
Jul 25, 9:44 PM MST	Areal Flood Advisory	PSR	Maricopa	3 hr
Jul 25, 10:20 PM MST	Areal Flood Advisory	PSR	Maricopa	3 hr
Jul 25, 11:01 PM MST	Areal Flood Advisory	PSR	Maricopa	3 hr
Jul 25, 11:30 PM MST	Areal Flood Advisory	PSR	Maricopa	4 hr
Jul 25, 11:46 PM MST	Areal Flood Advisory	PSR	Maricopa	4 hr
Jul 26, 12:17 AM MST	Areal Flood Advisory	PSR	Maricopa	3 hr
Jul 26, 12:28 AM MST	Areal Flood Advisory	PSR	Maricopa	3 hr
Jul 26, 12:50 AM MST	Flash Flood Warning Considerable damage threat	PSR	Maricopa	5 hr
Jul 26, 2:08 AM MST	Flash Flood Warning	PSR	Maricopa	4 hr
Jul 26, 6:17 AM MST	Areal Flood Advisory	PSR	Maricopa	3 hr
Jul 26, 12:41 PM MST	Dust Storm Advisory	PSR	Pinal	49 min
Jul 26, 3:26 PM MST	Flash Flood Warning Considerable damage threat	PSR	La Paz	3 hr
Jul 25, 5:40 PM MST	Areal Flood Advisory	PSR	Riverside, San Bernardino	3 hr
Jul 25, 6:32 PM MST	Areal Flood Advisory	PSR	Riverside	3 hr
Jul 25, 7:32 PM MST	Areal Flood Advisory	PSR	Imperial	3 hr

Nearby

Flash Flood Warnings in Arizona, 2022 Every flash flood warning in 2022

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.