Alert archive / Arizona / Severe Thunderstorm Warnings in 2021
Severe Thunderstorm Warning 24, NWS Phoenix, AZ
NWS Phoenix, AZ issued this severe thunderstorm warning at Jul 12, 2021, 9:40 PM MST for Maricopa County, Arizona. It was in force for 35 min. 1 report came from inside the area while it was in force.
The area
The outline as issued, with what was reported inside it.
The facts
- Issued
- Jul 12, 2021, 9:40 PM MST (04:40 UTC)
- Expired
- Jul 12, 2021, 10:15 PM MST
- In force
- 35 min
- Issued by
- NWS Phoenix, AZ
- Area
- Storm-based polygon
- Hail
- 1.0 in
- Wind
- 60.0 mph
County Maricopa County, AZ
The radar
The Phoenix radar (KIWA), 63 km from the middle of the area, began a volume at 04:40 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.
What was reported inside it
| Time | Report | Where | Remark |
|---|---|---|---|
| Jul 12, 9:50 PM MST | TSTM WND DMG | 9 Ese Carefree, AZ | MATURE PALO VERDE TREE BROKEN AT TRUNK. ANOTHER LARGE TREE DOWN OR PARTIALLY DOWN. |
Local storm reports filed while the alert was in force, from inside its polygon or its counties.
The nearest sounding before it
Phoenix, AZ (KPSR), launched 00:00Z, 4.7 hours before the alert went out and 51 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
- 523 J/kg
- Mixed-layer CIN
- -351 J/kg
- Mixed-layer LCL
- 2953 m above ground
- 0-6 km bulk shear
- 23 kt
- 0-1 km storm-relative helicity
- 10 m²/s²
- 0-3 km storm-relative helicity
- 38 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
312
WUUS55 KPSR 130440
SVRPSR
AZC013-130515-
/O.NEW.KPSR.SV.W.0024.210713T0440Z-210713T0515Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Phoenix AZ
940 PM MST Mon Jul 12 2021
The National Weather Service in Phoenix has issued a
* Severe Thunderstorm Warning for...
Maricopa County in south central Arizona...
* Until 1015 PM MST.
* At 940 PM MST, a severe thunderstorm was located near Desert
Mountain, or 12 miles northeast of Scottsdale, moving southwest at
10 mph.
HAZARD...60 mph wind gusts and quarter size hail.
SOURCE...Radar indicated.
IMPACT...Hail damage to vehicles is expected. Expect wind damage
to roofs, siding, and trees.
* Locations impacted include...
Scottsdale, Fountain Hills, Cave Creek, Carefree, McDowell Mountain
Park, Desert Mountain, Camp Creek, Rio Verde and Fort McDowell.
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 3400 11169 3390 11151 3356 11172 3379 11207
TIME...MOT...LOC 0440Z 038DEG 9KT 3384 11177
HAIL...1.00IN
WIND...60MPH
$$
SDB1 follow-up statement
939
WWUS55 KPSR 130453
SVSPSR
wind
WWUS55 KPSR 000000
SVSPSR
Severe Weather Statement
National Weather Service Phoenix AZ
953 PM MST Mon Jul 12 2021
AZC013-130515-
/O.CON.KPSR.SV.W.0024.000000T0000Z-210713T0515Z/
Maricopa AZ-
953 PM MST Mon Jul 12 2021
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 1015 PM MST
FOR MARICOPA COUNTY...
At 952 PM MST, a severe thunderstorm was located near Desert
Mountain, or near Scottsdale, moving southwest at 25 mph.
HAZARD...Ping pong ball size hail and 60 mph wind gusts.
SOURCE...Radar indicated.
IMPACT...People and animals outdoors will be injured. Expect hail
damage to roofs, siding, windows, and vehicles. Expect wind
damage to roofs, siding, and trees.
Locations impacted include...
Scottsdale, Fountain Hills, Cave Creek, Carefree, McDowell Mountain
Park, Desert Mountain, Camp Creek, Rio Verde and Fort McDowell.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
Continuous cloud to ground lightning is occurring with this storm.
Move indoors immediately. Lightning is one of nature's leading
killers. Remember, if you can hear thunder, you are close enough to
be struck by lightning.
Torrential rainfall is occurring with this storm, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.
&&
LAT...LON 3396 11176 3382 11156 3356 11172 3379 11207
TIME...MOT...LOC 0452Z 041DEG 20KT 3377 11182
HAIL...1.50IN
WIND...60MPH
$$
SDBThe office that day
Everything else NWS Phoenix, AZ issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 12, 7:37 PM MST | Special Weather Statement | PSR | Gila | 38 min |
| Jul 12, 8:17 PM MST | Severe Thunderstorm Warning | PSR | Gila, Pinal | 43 min |
| Jul 12, 8:29 PM MST | Flash Flood Warning | PSR | Gila | 3 hr |
| Jul 12, 9:18 PM MST | Special Weather Statement | PSR | 42 min | |
| Jul 12, 10:05 PM MST | Severe Thunderstorm Warning | PSR | Maricopa | 25 min |
| Jul 12, 10:14 PM MST | Flash Flood Warning | PSR | Gila, Maricopa | 2 hr |
| Jul 12, 10:28 PM MST | Special Weather Statement | PSR | Maricopa | 32 min |
| Jul 12, 11:35 PM MST | Special Weather Statement | PSR | 40 min |
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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.