Alert archive / Arizona / Flash Flood Warnings in 2022

Flash Flood Warning 42, NWS Phoenix, AZ

July 28, 2022Maricopa County, Arizona

NWS Phoenix, AZ issued this flash flood warning at Jul 28, 2022, 1:20 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 28, 2022, 1:20 PM MST (20:20 UTC)
Expired: Jul 28, 2022, 5:30 PM 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 20:20 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 12:00Z, 8.3 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: 698 J/kg
Mixed-layer CIN: -71 J/kg
Mixed-layer LCL: 1641 m above ground
0-6 km bulk shear: 3 kt
0-1 km storm-relative helicity: 10 m²/s²
0-3 km storm-relative helicity: 53 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 28, 1:05 PM MST, 15 minutes earlier.

Area forecast discussion, Jul 28, 1:05 PM MST, 15 minutes before

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In the hours before

Special weather statement, Jul 28, 12:17 PM MST, 1 hour 3 minutes before

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Local storm report, Jul 28, 12:29 PM MST, 51 minutes before

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Local storm report, Jul 28, 12:35 PM MST, 45 minutes before

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Special weather statement, Jul 28, 12:54 PM MST, 26 minutes before

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Local storm report, Jul 28, 12:58 PM MST, 22 minutes before

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Special weather statement, Jul 28, 1:12 PM MST, 8 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 27, 5:01 PM MST	Flash Flood Warning Considerable damage threat	PSR	Gila	4 hr
Jul 27, 7:06 PM MST	Areal Flood Advisory	PSR	Maricopa	3 hr
Jul 28, 4:54 AM MST	Areal Flood Advisory	PSR	Maricopa	3 hr
Jul 28, 6:31 AM MST	Areal Flood Advisory	PSR	Maricopa	119 min
Jul 28, 10:05 AM MST	Areal Flood Advisory	PSR	Maricopa	3 hr
Jul 28, 11:00 AM MST	Flash Flood Warning Considerable damage threat	PSR	Gila, Maricopa, Pinal	4 hr
Jul 28, 11:35 AM MST	Flash Flood Warning Considerable damage threat	PSR	Maricopa, Pinal	6 hr
Jul 28, 11:51 AM MST	Flash Flood Warning Considerable damage threat	PSR	Gila	4 hr
Jul 28, 12:17 PM MST	Special Weather Statement	PSR		28 min
Jul 28, 12:54 PM MST	Special Weather Statement	PSR		51 min
Jul 28, 1:12 PM MST	Special Weather Statement	PSR		33 min
Jul 28, 2:38 PM MST	Areal Flood Advisory	PSR	Gila, Maricopa	4 hr
Jul 28, 3:59 PM MST	Areal Flood Advisory	PSR	La Paz	3 hr
Jul 28, 4:03 PM MST	Special Weather Statement	PSR		42 min
Jul 28, 4:25 PM MST	Special Weather Statement	PSR	La Paz	35 min

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.