Alert archive / Arizona / Areal Flood Warnings in 2021
Areal Flood Warning 21, NWS Phoenix, AZ
NWS Phoenix, AZ issued this areal flood warning at Aug 18, 2021, 7:20 PM MST for Maricopa County, Arizona. It was in force for 6 hr. No storm report in the archive falls inside the area while it was in force.
The area
The outline as issued.
The facts
- Issued
- Aug 18, 2021, 7:20 PM MST (02:20 UTC)
- Expired
- Aug 19, 2021, 1:30 AM MST
- In force
- 6 hr
- Issued by
- NWS Phoenix, AZ
- Area
- Storm-based polygon
- Flood severity
- None
County Maricopa County, AZ
The radar
The Phoenix radar (KIWA), 58 km from the middle of the area, began a volume at 02:24 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 00:00Z, 2.3 hours before the alert went out and 58 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
- 510 J/kg
- Mixed-layer CIN
- -174 J/kg
- Mixed-layer LCL
- 1692 m above ground
- 0-6 km bulk shear
- 24 kt
- 0-1 km storm-relative helicity
- 157 m²/s²
- 0-3 km storm-relative helicity
- 230 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 1.7
The text
As transmitted.
394
WGUS45 KPSR 190220
FLWPSR
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Flood Warning
National Weather Service Phoenix AZ
720 PM MST Wed Aug 18 2021
AZC013-190530-
/O.NEW.KPSR.FA.W.0021.210819T0220Z-210819T0530Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Maricopa AZ-
720 PM MST Wed Aug 18 2021
The National Weather Service in Phoenix has issued a
* Flood Warning for...
Maricopa County in south central Arizona...
* Until 1030 PM MST.
* At 720 PM MST, Doppler radar indicated heavy rain due to
thunderstorms. Flooding is already occurring in the warned area.
* Some locations that will experience flooding include...
Ballantine Trailhead, Round Valley, Sugarloaf Mountain, Sunflower,
Sycamore Creek and Fort McDowell.
Flooding is occurring along the Sycamore Creek.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.
&&
LAT...LON 3398 11145 3391 11147 3385 11144 3375 11150
3369 11153 3363 11160 3360 11169 3365 11168
3370 11156 3384 11150 3400 11149
$$
CK2 follow-up statements
189
WGUS45 KPSR 190511
FLWPSR
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Flood Warning
National Weather Service Phoenix AZ
1011 PM MST Wed Aug 18 2021
AZC013-190830-
/O.EXT.KPSR.FA.W.0021.000000T0000Z-210819T0830Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Maricopa AZ-
1011 PM MST Wed Aug 18 2021
The National Weather Service in Phoenix has extended the
* Flood Warning for...
Maricopa County in south central Arizona...
* Until 130 AM MST.
* At 1011 PM MST, Doppler radar and automated rain gauges indicated
heavy rain due to thunderstorms. Flooding is already occurring in
the warned area.
* Some locations that will experience flooding include...
Ballantine Trailhead, Round Valley, Sugarloaf Mountain, Sunflower,
Sycamore Creek and Fort McDowell.
Flooding is occurring along the Sycamore Creek.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.
&&
LAT...LON 3398 11145 3391 11147 3385 11144 3375 11150
3369 11153 3363 11160 3360 11169 3365 11168
3370 11156 3384 11150 3400 11149
$$
CK065
WGUS85 KPSR 190827 RRB
FLSPSR
Flood Statement
National Weather Service Phoenix AZ
127 AM MST Thu Aug 19 2021
AZC013-190837-
/O.EXP.KPSR.FA.W.0021.000000T0000Z-210819T0830Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Maricopa AZ-
127 AM MST Thu Aug 19 2021
...FLOOD WARNING WILL EXPIRE AT 130 AM MST EARLY THIS MORNING FOR
MARICOPA COUNTY...
Flood waters have receded. The heavy rain has ended. Flooding is no
longer expected to pose a threat. Please continue to heed remaining
road closures.
LAT...LON 3398 11145 3391 11147 3385 11144 3375 11150
3369 11153 3363 11160 3360 11169 3365 11168
3370 11156 3384 11150 3400 11149
$$
SDBThe office that day
Everything else NWS Phoenix, AZ issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 18, 5:13 PM MST | Flash Flood Warning | PSR | Gila | 4 hr |
| Aug 18, 5:20 PM MST | Special Weather Statement | PSR | Gila | 40 min |
| Aug 18, 5:25 PM MST | Severe Thunderstorm Warning | PSR | Maricopa, Pinal | 50 min |
| Aug 18, 5:34 PM MST | Special Weather Statement | PSR | 41 min | |
| Aug 18, 5:39 PM MST | Flash Flood Warning | PSR | Gila | 4 hr |
| Aug 18, 5:40 PM MST | Special Weather Statement | PSR | Maricopa | 50 min |
| Aug 18, 5:43 PM MST | Severe Thunderstorm Warning | PSR | Maricopa | 32 min |
| Aug 18, 5:52 PM MST | Special Weather Statement | PSR | 38 min | |
| Aug 18, 6:09 PM MST | Flash Flood Warning | PSR | Maricopa, Pinal | 3 hr |
| Aug 18, 6:14 PM MST | Flash Flood Warning | PSR | Maricopa | 3 hr |
| Aug 18, 6:20 PM MST | Flash Flood Warning | PSR | Gila | 4 hr |
| Aug 18, 6:36 PM MST | Special Weather Statement | PSR | 39 min | |
| Aug 18, 7:33 PM MST | Areal Flood Warning | PSR | Maricopa | 6 hr |
| Aug 18, 7:33 PM MST | Areal Flood Warning | PSR | Maricopa | 6 hr |
| Aug 18, 8:57 PM MST | Areal Flood Warning | PSR | Maricopa | 14 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.