Alert archive / Arizona / Areal Flood Warnings in 2021
Areal Flood Warning 12, NWS Phoenix, AZ
NWS Phoenix, AZ issued this areal flood warning at Aug 10, 2021, 3:05 PM MST for Maricopa County, Pinal County, Arizona. It was in force for 7 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 10, 2021, 3:05 PM MST (22:05 UTC)
- Expired
- Aug 10, 2021, 10:03 PM MST
- In force
- 7 hr
- Issued by
- NWS Phoenix, AZ
- Area
- Storm-based polygon
- 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 22:08 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, 10.1 hours before the alert went out and 34 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.
- Mixed-layer CAPE
- 110 J/kg
- Mixed-layer CIN
- -193 J/kg
- Mixed-layer LCL
- 1490 m above ground
- 0-6 km bulk shear
- 9 kt
- 0-1 km storm-relative helicity
- 11 m²/s²
- 0-3 km storm-relative helicity
- 93 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
What forecasters said that day
The local office's own words before this areal 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 areal flood warning went out at Aug 10, 11:01 AM MST, 4 hours 4 minutes earlier.
Area forecast discussion, Aug 10, 11:01 AM MST, 4 hours 4 minutes before
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</html>In the hours before
Local storm report, Aug 10, 10:24 AM MST, 4 hours 41 minutes before
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</html>Local storm report, Aug 10, 1:08 PM MST, 1 hour 57 minutes before
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</html>Local storm report, Aug 10, 2:09 PM MST, 56 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE PHOENIX AZ
209 PM MST TUE AUG 10 2021
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0905 AM HEAVY RAIN 3 SE CHANDLER 33.26N 111.82W
08/10/2021 M2.72 INCH MARICOPA AZ MESONET
2.72 INCHES FELL BETWEEN 7:00 AND 9:05 AM.
2.13 INCHES IN 1 HOUR (BETWEEN 7:17 AND 8:17
AM) AT CHANDLER AIRPORT FCDMC AZ ALERT GAGE.
&&
MPLocal storm report, Aug 10, 2:25 PM MST, 40 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE PHOENIX AZ
225 PM MST TUE AUG 10 2021
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0805 AM HEAVY RAIN 3 WSW HIGLEY 33.29N 111.77W
08/10/2021 M0.95 INCH MARICOPA AZ TRAINED SPOTTER
A TRAINED SPOTTER IN GILBERT MEASURED 0.95
INCHES OF RAIN BETWEEN 735 AM AND 805 AM
NEAR LINDSAY ROAD AND PECOS RD. THE STORM
TOTAL BETWEEN 720AM AND 905 AM WAS 1.34
INCHES.
&&
AJThe office that day
Everything else NWS Phoenix, AZ issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 9, 5:24 PM MST | Areal Flood Advisory | PSR | La Paz | 3 hr |
| Aug 9, 5:44 PM MST | Special Weather Statement | PSR | La Paz | 46 min |
| Aug 9, 6:22 PM MST | Special Weather Statement | PSR | 38 min | |
| Aug 9, 10:11 PM MST | Special Weather Statement | PSR | Gila | 34 min |
| Aug 9, 10:40 PM MST | Flash Flood Warning | PSR | Gila | 4 hr |
| Aug 9, 11:51 PM MST | Flash Flood Warning | PSR | Maricopa | 8 hr |
| Aug 10, 1:40 AM MST | Special Weather Statement | PSR | Maricopa | 50 min |
| Aug 10, 1:54 AM MST | Special Weather Statement | PSR | Maricopa | 51 min |
| Aug 10, 2:15 AM MST | Special Weather Statement | PSR | Maricopa | 45 min |
| Aug 10, 2:23 AM MST | Areal Flood Advisory | PSR | Maricopa, Pinal | 2 hr |
| Aug 10, 4:27 AM MST | Special Weather Statement | PSR | La Paz | 48 min |
| Aug 10, 5:07 AM MST | Special Weather Statement | PSR | La Paz | 53 min |
| Aug 10, 5:09 AM MST | Areal Flood Advisory | PSR | La Paz | 2 hr |
| Aug 10, 5:52 AM MST | Areal Flood Advisory | PSR | Maricopa, Pinal | 5 hr |
| Aug 10, 6:21 AM MST | Special Weather Statement | PSR | La Paz | 39 min |
| Aug 10, 7:39 AM MST | Areal Flood Advisory | PSR | Maricopa, Pinal | 3 hr |
| Aug 10, 8:00 AM MST | Flash Flood Warning | PSR | Maricopa | 3 hr |
| Aug 10, 8:06 AM MST | Flash Flood Warning | PSR | Maricopa | 4 hr |
| Aug 10, 8:30 AM MST | Flash Flood Warning | PSR | Maricopa, Pinal | 7 hr |
| Aug 10, 9:54 AM MST | Areal Flood Advisory | PSR | La Paz | 3 hr |
| Aug 10, 4:43 PM MST | Special Weather Statement | PSR | 62 min | |
| Aug 10, 4:44 PM MST | Special Weather Statement | PSR | 61 min | |
| Aug 10, 4:56 PM MST | Severe Thunderstorm Warning | PSR | Maricopa | 49 min |
| Aug 9, 5:06 PM MST | Areal Flood Advisory | PSR | Riverside | 3 hr |
| Aug 9, 6:09 PM MST | Areal Flood Advisory | PSR | Riverside, San Bernardino | 115 min |
| Aug 10, 3:11 PM MST | Areal Flood Advisory | PSR | Riverside, San Bernardino | 3 hr |
Nearby
Areal Flood Warnings in Arizona, 2021Every areal flood warning 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.