Alert archive / Arizona / Severe Thunderstorm Warnings in 2021
Severe Thunderstorm Warning 73, NWS Phoenix, AZ
NWS Phoenix, AZ issued this severe thunderstorm warning at Aug 14, 2021, 6:22 PM MST for Maricopa County, Arizona. It was in force for 38 min. 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 14, 2021, 6:22 PM MST (01:22 UTC)
- Expired
- Aug 14, 2021, 7:00 PM MST
- In force
- 38 min
- Issued by
- NWS Phoenix, AZ
- Area
- Storm-based polygon
- Hail
- 0.88 in
- Wind
- 60.0 mph
County Maricopa County, AZ
The radar
The Phoenix radar (KIWA), 60 km from the middle of the area, began a volume at 01:23 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
Phoenix, AZ (KPSR), launched 00:00Z, 1.4 hours before the alert went out and 49 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
- 1092 J/kg
- Mixed-layer CIN
- -58 J/kg
- Mixed-layer LCL
- 1640 m above ground
- 0-6 km bulk shear
- 12 kt
- 0-1 km storm-relative helicity
- 17 m²/s²
- 0-3 km storm-relative helicity
- 106 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
060
WUUS55 KPSR 150122
SVRPSR
AZC013-150200-
/O.NEW.KPSR.SV.W.0073.210815T0122Z-210815T0200Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Phoenix AZ
622 PM MST Sat Aug 14 2021
The National Weather Service in Phoenix has issued a
* Severe Thunderstorm Warning for...
Maricopa County in south central Arizona...
* Until 700 PM MST.
* At 622 PM MST, severe thunderstorms were located along a line
extending from near Horseshoe Reservoir to near Desert Mountain to
Rio Verde, moving southwest at 25 mph.
HAZARD...60 mph wind gusts and nickel size hail.
SOURCE...Radar indicated.
IMPACT...Expect damage to roofs, siding, and trees.
* Locations impacted include...
Phoenix, Scottsdale, Fountain Hills, New River, Cave Creek,
Carefree, McDowell Mountain Park, Desert Mountain, Scottsdale
Airport, Desert Ridge Marketplace, Camp Creek, Rio Verde, Horseshoe
Reservoir, Seven Springs and Fort McDowell.
This includes the following highways...
AZ Route 51 near mile marker 15.
AZ Route 101 between mile markers 29 and 40.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
Torrential rainfall is occurring with these storms, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.
&&
LAT...LON 3399 11157 3383 11162 3370 11158 3354 11182
3370 11208 3403 11199
TIME...MOT...LOC 0122Z 062DEG 23KT 3399 11168 3381 11176 3370 11169
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...0.88 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH
$$
DH1 follow-up statement
132
WWUS55 KPSR 150154
SVSPSR
Severe Weather Statement
National Weather Service Phoenix AZ
654 PM MST Sat Aug 14 2021
AZC013-150204-
/O.EXP.KPSR.SV.W.0073.000000T0000Z-210815T0200Z/
Maricopa AZ-
654 PM MST Sat Aug 14 2021
...THE SEVERE THUNDERSTORM WARNING FOR MARICOPA COUNTY WILL EXPIRE AT
700 PM MST...
The storms which prompted the warning have weakened below severe
limits, and no longer pose an immediate threat to life or property.
Therefore, the warning will be allowed to expire.
LAT...LON 3399 11157 3383 11162 3370 11158 3354 11182
3370 11208 3403 11199
TIME...MOT...LOC 0154Z 062DEG 23KT 3390 11189 3372 11197 3361 11190
$$
DHThe office that day
Everything else NWS Phoenix, AZ issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 14, 5:26 PM MST | Special Weather Statement | PSR | 49 min | |
| Aug 14, 5:46 PM MST | Special Weather Statement | PSR | 44 min | |
| Aug 14, 5:51 PM MST | Severe Thunderstorm Warning | PSR | Gila, Maricopa | 24 min |
| Aug 14, 6:17 PM MST | Special Weather Statement | PSR | 43 min | |
| Aug 14, 6:33 PM MST | Special Weather Statement | PSR | 42 min | |
| Aug 14, 6:36 PM MST | Special Weather Statement | PSR | 39 min | |
| Aug 14, 6:45 PM MST | Special Weather Statement | PSR | Maricopa | 45 min |
| Aug 14, 6:53 PM MST | Special Weather Statement | PSR | 52 min | |
| Aug 14, 7:17 PM MST | Special Weather Statement | PSR | 43 min | |
| Aug 14, 7:19 PM MST | Special Weather Statement | PSR | 41 min | |
| Aug 14, 11:13 PM MST | Special Weather Statement | PSR | La Paz | 47 min |
| Aug 14, 11:17 PM MST | Special Weather Statement | PSR | La Paz | 43 min |
| Aug 14, 11:26 PM MST | Special Weather Statement | PSR | 64 min | |
| Aug 15, 12:55 AM MST | Special Weather Statement | PSR | 65 min | |
| Aug 15, 4:42 AM MST | Areal Flood Advisory | PSR | Maricopa, Yuma | 6 hr |
Nearby
Severe Thunderstorm Warnings in Arizona, 2021Every severe thunderstorm 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.