Alert archive / Arizona / Severe Thunderstorm Warnings in 2021
Severe Thunderstorm Warning 78, NWS Phoenix, AZ
NWS Phoenix, AZ issued this severe thunderstorm warning at Aug 15, 2021, 11:14 PM MST for Maricopa County, Arizona. It was in force for 46 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, 11:14 PM MST (06:14 UTC)
- Expired
- Aug 16, 2021, 12:00 AM MST
- In force
- 46 min
- Issued by
- NWS Phoenix, AZ
- Area
- Storm-based polygon
- Hail
- 0.75 in
- Wind
- 60.0 mph
County Maricopa County, AZ
The radar
The Phoenix radar (KIWA), 22 km from the middle of the area, began a volume at 06:14 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, 6.2 hours before the alert went out and 14 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.
124
WUUS55 KPSR 160614
SVRPSR
AZC013-160700-
/O.NEW.KPSR.SV.W.0078.210816T0614Z-210816T0700Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Phoenix AZ
1114 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 midnight MST.
* At 1114 PM MST, a severe thunderstorm was located over Mesa, moving
southwest at 5 mph.
HAZARD...60 mph wind gusts and penny size hail.
SOURCE...Radar indicated.
IMPACT...Expect damage to roofs, siding, and trees.
* Locations impacted include...
Phoenix, Mesa, Chandler, Scottsdale, Gilbert, Tempe, Fountain
Hills, Paradise Valley, East Mesa, Sun Lakes, Tempe Marketplace,
Papago Park, Granite Reef Dam, Falcon Field Airport and Salt River
Indian Community.
This includes the following highways...
AZ Interstate 10 between mile markers 153 and 166.
US Highway 60 between mile markers 173 and 190.
AZ Route 87 between mile markers 161 and 189.
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 3362 11185 3354 11159 3334 11167 3320 11177
3326 11204 3348 11198
TIME...MOT...LOC 0614Z 043DEG 6KT 3344 11177
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...0.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH
$$
SDB2 follow-up statements
555
WWUS55 KPSR 160630
SVSPSR
Severe Weather Statement
National Weather Service Phoenix AZ
1130 PM MST Sun Aug 15 2021
AZC013-160700-
/O.CON.KPSR.SV.W.0078.000000T0000Z-210816T0700Z/
Maricopa AZ-
1130 PM MST Sun Aug 15 2021
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL MIDNIGHT MST
FOR MARICOPA COUNTY...
At 1129 PM MST, a severe thunderstorm was located over Chandler,
moving southwest at 15 mph.
HAZARD...60 mph wind gusts and penny size hail.
SOURCE...Radar indicated.
IMPACT...Expect damage to roofs, siding, and trees.
Locations impacted include...
Phoenix, Mesa, Chandler, Scottsdale, Gilbert, Tempe, Paradise Valley,
Sun Lakes, Mesa Riverview Mall, Tempe Marketplace, Papago Park,
Arizona Mills Mall, Gilbert City Hall, Salt River Indian Community
and Downtown Mesa.
This includes the following highways...
AZ Interstate 10 between mile markers 153 and 166.
US Highway 60 between mile markers 173 and 184.
AZ Route 87 between mile markers 161 and 183.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
Continuous cloud to ground lightning is occurring with this storm.
Move indoors immediately. Lightning is one of nature's leading
killers. Remember, if you can hear thunder, you are close enough to
be struck by lightning.
Torrential rainfall is occurring with this storm, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.
&&
LAT...LON 3357 11189 3349 11173 3334 11176 3321 11182
3326 11204 3348 11198
TIME...MOT...LOC 0629Z 034DEG 12KT 3327 11188
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...0.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH
$$
SDB125
WWUS55 KPSR 160653
SVSPSR
Severe Weather Statement
National Weather Service Phoenix AZ
1153 PM MST Sun Aug 15 2021
AZC013-160703-
/O.EXP.KPSR.SV.W.0078.000000T0000Z-210816T0700Z/
Maricopa AZ-
1153 PM MST Sun Aug 15 2021
...THE SEVERE THUNDERSTORM WARNING FOR MARICOPA COUNTY WILL EXPIRE AT
MIDNIGHT 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 3357 11189 3349 11173 3334 11176 3321 11182
3326 11204 3348 11198
TIME...MOT...LOC 0653Z 043DEG 6KT 3324 11191
$$
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, 11:31 PM MST | Special Weather Statement | PSR | Maricopa | 44 min |
| Aug 15, 11:37 PM MST | Severe Thunderstorm Warning | PSR | Maricopa | 38 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.