Alert archive / Arizona / Flash Flood Warnings in 2023

Flash Flood Warning 6, NWS Phoenix, AZ

July 28, 2023Maricopa County, Pinal County, Arizona

NWS Phoenix, AZ issued this flash flood warning at Jul 28, 2023, 10:20 PM MST for Maricopa County, Pinal 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, 2023, 10:20 PM MST (05:20 UTC)
Expired
Jul 29, 2023, 2:30 AM MST
In force
4 hr
Issued by
NWS Phoenix, AZ
Area
Storm-based polygon
Damage threat
Considerable
Flood severity
None

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 05:22 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 00:00Z, 5.3 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-pSkew-T log-p diagram, Tuscon, AZ at 00:00Z on 2023-07-29Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1103 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Tuscon, AZ at 00:00Z on 2023-07-29The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -46 square meters per square second.1939Sfc1 km3 km6 km9 kmRMLM
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
1103 J/kg
Mixed-layer CIN
-47 J/kg
Mixed-layer LCL
3328 m above ground
0-6 km bulk shear
22 kt
0-1 km storm-relative helicity
-46 m²/s²
0-3 km storm-relative helicity
50 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.9

Open this sounding in Storm Lab

The office that day

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

IssuedProductOfficeCountiesLasted
Jul 28, 7:40 PM MSTSpecial Weather StatementPSR35 min
Jul 28, 7:44 PM MSTSevere Thunderstorm WarningPSRGila31 min
Jul 28, 8:03 PM MSTSpecial Weather StatementPSRGila27 min
Jul 28, 8:27 PM MSTDust Storm AdvisoryPSRMaricopa, Pinal63 min
Jul 28, 9:03 PM MSTSpecial Weather StatementPSR42 min
Jul 28, 9:46 PM MSTSpecial Weather StatementPSRPinal44 min
Jul 29, 3:57 PM MSTSpecial Weather StatementPSRGila33 min
Jul 29, 4:29 PM MSTSpecial Weather StatementPSRGila31 min

Nearby

Flash Flood Warnings in Arizona, 2023Every flash flood warning in 2023

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.