Alert archive / Arizona / Areal Flood Advisories in 2021

Areal Flood Advisory 49, NWS Phoenix, AZ

July 24, 2021Maricopa County, Pinal County, Arizona

NWS Phoenix, AZ issued this areal flood advisory at Jul 24, 2021, 9:22 AM MST for Maricopa County, Pinal County, Arizona. It was in force for 3 hr.

The area

The counties it named.

The facts

Issued: Jul 24, 2021, 9:22 AM MST (16:22 UTC)
Expired: Jul 24, 2021, 12:30 PM MST
In force: 3 hr
Issued by: NWS Phoenix, AZ
Area: Storm-based polygon

Counties Maricopa County, AZ, Pinal County, AZ

The radar

The Phoenix radar (KIWA), 29 km from the middle of the area, began a volume at 16:23 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

Tuscon, AZ (KTUS), launched 12:00Z, 4.4 hours before the alert went out and 143 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: 279 J/kg
Mixed-layer CIN: -48 J/kg
Mixed-layer LCL: 1094 m above ground
0-6 km bulk shear: 17 kt
0-1 km storm-relative helicity: 50 m²/s²
0-3 km storm-relative helicity: 138 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.3

Open this sounding in Storm Lab

What forecasters said that day

The local office's own words before this areal flood advisory 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 areal flood advisory went out at Jul 24, 4:15 AM MST, 5 hours 7 minutes earlier.

Area forecast discussion, Jul 24, 4:15 AM MST, 5 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 23, 6:18 PM MST	Areal Flood Warning	PSR	Maricopa	6 hr
Jul 23, 10:19 PM MST	River Flood Advisory	PSR	Maricopa	7 hr
Jul 24, 7:47 AM MST	Areal Flood Advisory	PSR	Maricopa, Pinal	3 hr
Jul 24, 10:44 AM MST	Areal Flood Advisory	PSR	Maricopa, Pinal	2 hr
Jul 24, 11:59 AM MST	Flash Flood Warning Considerable damage threat	PSR	Gila	4 hr

Nearby

Areal Flood Advisories in Arizona, 2021 Every areal flood advisory 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.