Alert archive / Arizona / Severe Thunderstorm Warnings in 2021
Severe Thunderstorm Warning 79, NWS Phoenix, AZ
NWS Phoenix, AZ issued this severe thunderstorm warning at Aug 15, 2021, 11:37 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 15, 2021, 11:37 PM MST (06:37 UTC)
- Expired
- Aug 16, 2021, 12:15 AM 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), 45 km from the middle of the area, began a volume at 06:38 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, 6.6 hours before the alert went out and 15 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
- 1548 J/kg
- Mixed-layer CIN
- -94 J/kg
- Mixed-layer LCL
- 2123 m above ground
- 0-6 km bulk shear
- 25 kt
- 0-1 km storm-relative helicity
- -22 m²/s²
- 0-3 km storm-relative helicity
- 56 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.3
The text
As transmitted.
290
WUUS55 KPSR 160637
SVRPSR
AZC013-160715-
/O.NEW.KPSR.SV.W.0079.210816T0637Z-210816T0715Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Phoenix AZ
1137 PM MST Sun Aug 15 2021
The National Weather Service in Phoenix has issued a
* Severe Thunderstorm Warning for...
Maricopa County in south central Arizona...
* Until 1215 AM MST.
* At 1137 PM MST, a severe thunderstorm was located over Piestewa
Peak Park, or over Paradise Valley, moving southwest at 10 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, Glendale, Scottsdale, Tempe, Paradise Valley, Papago Park,
Piestewa Peak Park, North Mountain Park, Arizona State Fairgrounds,
Downtown Phoenix, Downtown Scottsdale, Metro Center Mall, Camelback
Mountain, Sky Harbor Airport and Downtown Glendale.
This includes the following highways...
AZ Interstate 10 between mile markers 139 and 155.
AZ Interstate 17 between mile markers 195 and 211.
AZ Route 51 between mile markers 1 and 14.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
Large hail and damaging winds and continuous cloud to ground
lightning is occurring with this storm. Move indoors immediately.
Lightning is one of nature's leading killers. Remember, if you can
hear thunder, you are close enough to be struck by lightning.
Torrential rainfall is occurring with this storm, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.
&&
LAT...LON 3366 11200 3357 11184 3335 11199 3349 11223
3360 11215
TIME...MOT...LOC 0637Z 036DEG 11KT 3352 11200
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...0.88 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH
$$
SDB1 follow-up statement
025
WWUS55 KPSR 160706
SVSPSR
Severe Weather Statement
National Weather Service Phoenix AZ
1206 AM MST Mon Aug 16 2021
AZC013-160716-
/O.EXP.KPSR.SV.W.0079.000000T0000Z-210816T0715Z/
Maricopa AZ-
1206 AM MST Mon Aug 16 2021
...THE SEVERE THUNDERSTORM WARNING FOR MARICOPA COUNTY WILL EXPIRE AT
1215 AM MST...
The storm which prompted the warning has weakened below severe
limits, and has exited the warned area. Therefore, the warning will
be allowed to expire. However gusty winds are still possible with
this thunderstorm.
LAT...LON 3366 11200 3357 11184 3335 11199 3349 11223
3360 11215
TIME...MOT...LOC 0706Z 036DEG 11KT 3346 11205
$$
SDBThe office that day
Everything else NWS Phoenix, AZ issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 15, 7:49 PM MST | Special Weather Statement | PSR | Gila | 56 min |
| Aug 15, 8:26 PM MST | Severe Thunderstorm Warning | PSR | Gila | 49 min |
| Aug 15, 9:14 PM MST | Severe Thunderstorm Warning | PSR | Gila, Maricopa, Pinal | 46 min |
| Aug 15, 9:18 PM MST | Special Weather Statement | PSR | Gila | 42 min |
| Aug 15, 9:58 PM MST | Severe Thunderstorm Warning | PSR | Gila, Maricopa, Pinal | 47 min |
| Aug 15, 10:14 PM MST | Flash Flood Warning | PSR | Gila | 4 hr |
| Aug 15, 10:31 PM MST | Severe Thunderstorm Warning | PSR | Maricopa, Pinal | 44 min |
| Aug 15, 10:45 PM MST | Special Weather Statement | PSR | Pinal | 45 min |
| Aug 15, 10:50 PM MST | Flash Flood Warning | PSR | Gila, Maricopa, Pinal | 6 hr |
| Aug 15, 10:55 PM MST | Dust Storm Advisory | PSR | Maricopa, Pinal | 65 min |
| Aug 15, 10:58 PM MST | Areal Flood Advisory | PSR | Maricopa, Pinal | 3 hr |
| Aug 15, 11:14 PM MST | Severe Thunderstorm Warning | PSR | Maricopa | 46 min |
| Aug 15, 11:31 PM MST | Special Weather Statement | PSR | Maricopa | 44 min |
| Aug 15, 11:44 PM MST | Severe Thunderstorm Warning | PSR | Maricopa | 32 min |
| Aug 15, 11:45 PM MST | Areal Flood Advisory | PSR | Maricopa | 3 hr |
| Aug 16, 12:18 AM MST | Special Weather Statement | PSR | 42 min | |
| Aug 16, 12:49 AM MST | Severe Thunderstorm Warning | PSR | La Paz, Maricopa | 56 min |
| Aug 16, 1:33 AM MST | Flash Flood Warning | PSR | La Paz, Maricopa | 6 hr |
| Aug 16, 1:47 AM MST | Special Weather Statement | PSR | La Paz | 58 min |
| Aug 16, 1:54 AM MST | Severe Thunderstorm Warning | PSR | La Paz | 66 min |
| Aug 16, 2:22 AM MST | Special Weather Statement | PSR | La Paz | 68 min |
| Aug 16, 2:53 AM MST | Flash Flood Warning | PSR | La Paz | 5 hr |
| Aug 16, 3:08 AM MST | Dust Storm Advisory | PSR | La Paz, Yuma | 2 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.