Alert archive / Arizona / Flash Flood Warnings in 2022

Flash Flood Warning 212, NWS Phoenix, AZ

August 20, 2022Pinal County, Arizona

NWS Phoenix, AZ issued this flash flood warning at Aug 20, 2022, 11:37 AM MST for Pinal County, Arizona. It was in force for 3 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
Aug 20, 2022, 11:37 AM MST (18:37 UTC)
Expired
Aug 20, 2022, 3:05 PM MST
In force
3 hr
Issued by
NWS Phoenix, AZ
Area
Storm-based polygon
Damage threat
Considerable
Flood severity
None

County Pinal County, AZ

The radar

The Phoenix radar (KIWA), 52 km from the middle of the area, began a volume at 18:40 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, 6.6 hours before the alert went out and 92 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 12:00Z on 2022-08-20Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 639 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 12:00Z on 2022-08-20The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 34 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
639 J/kg
Mixed-layer CIN
-2 J/kg
Mixed-layer LCL
630 m above ground
0-6 km bulk shear
10 kt
0-1 km storm-relative helicity
34 m²/s²
0-3 km storm-relative helicity
29 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 Aug 20, 11:27 AM MST, 10 minutes earlier.

Area forecast discussion, Aug 20, 11:27 AM MST, 10 minutes before
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In the hours before

Special weather statement, Aug 20, 10:39 AM MST, 58 minutes before
Special Weather Statement
National Weather Service Phoenix AZ
1039 AM MST Sat Aug 20 2022

AZZ553-201830-
Northwest Pinal County AZ-
1039 AM MST Sat Aug 20 2022

...A strong thunderstorm will impact portions of Pinal County through
1130 AM MST...

At 1039 AM MST, Doppler radar was tracking a strong thunderstorm near
Blackwater, or 8 miles northwest of Coolidge. This storm was nearly
stationary.

HAZARD...Winds in excess of 40 mph.

SOURCE...Radar indicated.

IMPACT...Gusty winds could knock down tree limbs and blow around
         unsecured objects.

Locations impacted include...
Casa Grande, Coolidge and Blackwater.

This includes the following highways...
AZ Interstate 10 between mile markers 184 and 188.
AZ Route 87 between mile markers 132 and 149.

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.

Frequent cloud to ground lightning is occurring with this storm.
Lightning can strike 10 miles away from a thunderstorm. Seek a safe
shelter inside a building or vehicle.

&&

LAT...LON 3313 11169 3313 11152 3296 11152 3296 11181
TIME...MOT...LOC 1739Z 006DEG 1KT 3307 11164

MAX HAIL SIZE...0.00 IN
MAX WIND GUST...40 MPH

Feldkircher
Special weather statement, Aug 20, 11:05 AM MST, 32 minutes before
Special Weather Statement
National Weather Service Phoenix AZ
1105 AM MST Sat Aug 20 2022

AZZ552-555-558-201845-
Apache Junction/Gold Canyon AZ-Superior AZ-
Pinal/Superstition Mountains AZ-
1105 AM MST Sat Aug 20 2022

...A strong thunderstorm will impact portions of Pinal County through
1145 AM MST...

At 1105 AM MST, Doppler radar was tracking a strong thunderstorm over
Kings Ranch, or over Gold Canyon. This storm was nearly stationary.

HAZARD...Winds in excess of 40 mph.

SOURCE...Radar indicated.

IMPACT...Gusty winds could knock down tree limbs and blow around
         unsecured objects.

Locations impacted include...
Apache Junction, Gold Canyon, Kings Ranch and Gold Camp.

This includes US Highway 60 between mile markers 198 and 210.

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.

Frequent cloud to ground lightning is occurring with this storm.
Lightning can strike 10 miles away from a thunderstorm. Seek a safe
shelter inside a building or vehicle.

&&

LAT...LON 3344 11148 3340 11134 3327 11135 3333 11158
TIME...MOT...LOC 1805Z 028DEG 2KT 3339 11143

MAX HAIL SIZE...0.00 IN
MAX WIND GUST...40 MPH

Feldkircher
Special weather statement, Aug 20, 11:12 AM MST, 25 minutes before
Special Weather Statement
National Weather Service Phoenix AZ
1112 AM MST Sat Aug 20 2022

AZZ553-201900-
Northwest Pinal County AZ-
1112 AM MST Sat Aug 20 2022

...A strong thunderstorm will impact portions of Pinal County through
NOON MST...

At 1112 AM MST, Doppler radar was tracking a strong thunderstorm near
Olberg, or 11 miles south of Sun Lakes. This storm was nearly
stationary.

HAZARD...Winds in excess of 40 mph.

SOURCE...Radar indicated.

IMPACT...Gusty winds could knock down tree limbs and blow around
         unsecured objects.

Locations impacted include...
Casa Grande, Maricopa, Olberg, Ak-Chin Village and Sacaton.

This includes the following highways...
AZ Interstate 10 between mile markers 176 and 179.
AZ Route 347 between mile markers 168 and 176.

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.

Frequent cloud to ground lightning is occurring with this storm.
Lightning can strike 10 miles away from a thunderstorm. Seek a safe
shelter inside a building or vehicle.

&&

LAT...LON 3315 11200 3312 11180 3296 11181 3298 11210
TIME...MOT...LOC 1812Z 348DEG 1KT 3306 11190

MAX HAIL SIZE...0.00 IN
MAX WIND GUST...40 MPH

Feldkircher

The office that day

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

IssuedProductOfficeCountiesLasted
Aug 19, 5:03 PM MSTFlash Flood Warning Considerable damage threatPSRMaricopa2 hr
Aug 19, 5:13 PM MSTFlash Flood Warning Considerable damage threatPSRMaricopa3 hr
Aug 19, 5:13 PM MSTSevere Thunderstorm WarningPSRMaricopa36 min
Aug 19, 5:38 PM MSTSpecial Weather StatementPSR52 min
Aug 19, 5:40 PM MSTFlash Flood Warning Considerable damage threatPSRMaricopa6 hr
Aug 19, 6:04 PM MSTFlash Flood Warning Considerable damage threatPSRMaricopa5 hr
Aug 19, 6:18 PM MSTFlash Flood Warning Considerable damage threatPSRMaricopa4 hr
Aug 19, 6:25 PM MSTSpecial Weather StatementPSR50 min
Aug 19, 6:32 PM MSTFlash Flood Warning Considerable damage threatPSRGila6 hr
Aug 19, 6:58 PM MSTSevere Thunderstorm WarningPSRYuma25 min
Aug 19, 7:00 PM MSTSpecial Weather StatementPSRMaricopa45 min
Aug 19, 7:04 PM MSTAreal Flood AdvisoryPSRMaricopa3 hr
Aug 19, 7:08 PM MSTSpecial Weather StatementPSRLa Paz52 min
Aug 19, 7:10 PM MSTAreal Flood AdvisoryPSRLa Paz, Maricopa13 min
Aug 19, 7:12 PM MSTAreal Flood AdvisoryPSRMaricopa4 hr
Aug 19, 7:23 PM MSTFlash Flood Warning Considerable damage threatPSRLa Paz, Maricopa3 hr
Aug 19, 7:25 PM MSTAreal Flood AdvisoryPSRMaricopa5 hr
Aug 19, 7:25 PM MSTSevere Thunderstorm WarningPSRLa Paz20 min
Aug 19, 7:35 PM MSTSpecial Weather StatementPSR40 min
Aug 19, 7:52 PM MSTFlash Flood Warning Considerable damage threatPSRMaricopa4 hr
Aug 19, 7:56 PM MSTDust Storm AdvisoryPSRLa Paz, Yuma64 min
Aug 19, 8:18 PM MSTFlash Flood Warning Considerable damage threatPSRLa Paz4 hr
Aug 19, 8:31 PM MSTAreal Flood AdvisoryPSRLa Paz, Maricopa11 min
Aug 19, 8:42 PM MSTFlash Flood Warning Considerable damage threatPSRLa Paz, Maricopa8 hr
Aug 19, 8:44 PM MSTAreal Flood AdvisoryPSRLa Paz, Maricopa3 hr
Aug 19, 8:48 PM MSTAreal Flood AdvisoryPSRLa Paz3 hr
Aug 19, 8:59 PM MSTFlash Flood Warning Considerable damage threatPSRLa Paz, Maricopa6 hr
Aug 19, 9:18 PM MSTAreal Flood AdvisoryPSRLa Paz, Maricopa, Yuma3 hr
Aug 19, 10:07 PM MSTAreal Flood AdvisoryPSRYuma4 hr
Aug 19, 10:08 PM MSTAreal Flood AdvisoryPSRMaricopa, Yuma20 min
Aug 19, 10:11 PM MSTDust Storm AdvisoryPSRLa Paz, Yuma64 min
Aug 19, 10:19 PM MSTSevere Thunderstorm WarningPSRYuma41 min
Aug 19, 10:28 PM MSTFlash Flood Warning Considerable damage threatPSRMaricopa, Yuma6 hr
Aug 19, 10:44 PM MSTAreal Flood AdvisoryPSRYuma3 hr
Aug 19, 10:54 PM MSTFlash Flood Warning Considerable damage threatPSRYuma4 hr
Aug 19, 11:48 PM MSTAreal Flood AdvisoryPSRYuma3 hr
Aug 20, 12:01 AM MSTAreal Flood AdvisoryPSRMaricopa4 hr
Aug 20, 12:34 AM MSTFlash Flood Warning Considerable damage threatPSRLa Paz, Maricopa, Yuma4 hr
Aug 20, 12:45 AM MSTAreal Flood WarningPSRLa Paz11 hr
Aug 20, 2:05 AM MSTAreal Flood AdvisoryPSRMaricopa3 hr
Aug 20, 3:06 AM MSTAreal Flood WarningPSRLa Paz, Maricopa9 hr
Aug 20, 6:43 AM MSTAreal Flood WarningPSRGila6 hr
Aug 20, 10:39 AM MSTSpecial Weather StatementPSRPinal51 min
Aug 20, 11:05 AM MSTSpecial Weather StatementPSRPinal40 min
Aug 20, 11:12 AM MSTSpecial Weather StatementPSR48 min
Aug 20, 11:56 AM MSTFlash Flood Warning Considerable damage threatPSRPinal3 hr
Aug 20, 12:04 PM MSTFlash Flood Warning Considerable damage threatPSRGila3 hr
Aug 20, 12:44 PM MSTSpecial Weather StatementPSRMaricopa46 min
Aug 20, 1:01 PM MSTFlash Flood Warning Considerable damage threatPSRMaricopa, Pinal3 hr
Aug 20, 1:18 PM MSTSpecial Weather StatementPSRMaricopa42 min
Aug 20, 1:33 PM MSTSpecial Weather StatementPSRPinal42 min
Aug 20, 2:19 PM MSTFlash Flood Warning Considerable damage threatPSRPinal4 hr
Aug 20, 2:22 PM MSTSpecial Weather StatementPSR38 min
Aug 20, 2:30 PM MSTFlash Flood Warning Considerable damage threatPSRMaricopa4 hr
Aug 20, 3:04 PM MSTFlash Flood Warning Considerable damage threatPSRMaricopa3 hr
Aug 20, 4:17 PM MSTFlash Flood Warning Considerable damage threatPSRGila3 hr
Aug 20, 1:16 PM MSTSpecial Weather StatementPSRRiverside44 min
Aug 20, 1:40 PM MSTFlash Flood Warning Considerable damage threatPSRRiverside2 hr
Aug 20, 3:33 PM MSTSpecial Weather StatementPSRRiverside42 min
Aug 20, 3:44 PM MSTSevere Thunderstorm WarningPSRRiverside, San Bernardino29 min
Aug 20, 4:08 PM MSTFlash Flood Warning Considerable damage threatPSRRiverside, San Bernardino115 min

Nearby

Flash Flood Warnings in Arizona, 2022Every 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.