Alert archive / Arizona / Severe Thunderstorm Warnings in 2021
Severe Thunderstorm Warning 21, NWS Phoenix, AZ
NWS Phoenix, AZ issued this severe thunderstorm warning at Jul 10, 2021, 8:16 PM MST for Maricopa County, Pinal County, Arizona. It was in force for 44 min. 2 reports 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 10, 2021, 8:16 PM MST (03:16 UTC)
- Expired
- Jul 10, 2021, 9:00 PM MST
- In force
- 44 min
- Issued by
- NWS Phoenix, AZ
- Area
- Storm-based polygon
- Hail
- 0.75 in
- Wind
- 60.0 mph
Counties Maricopa County, AZ, Pinal County, AZ
The radar
The Phoenix radar (KIWA), 50 km from the middle of the area, began a volume at 03:15 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 10, 8:35 PM MST | TSTM WND GST 60 | 9 Se Maricopa, AZ | REPORTED AT AK-CHIN RGNL AIRPORT. |
| Jul 10, 8:40 PM MST | TSTM WND DMG | Maricopa, AZ | ***DELAYED REPORT*** TOP HALF OF A 20 FT VERTICAL ANTENNA MAST TOPPLED OVER. |
Local storm reports filed while the alert was in force, from inside its polygon or its counties.
The watch it was issued in
The SPC watch in force over the same counties when this warning went out.
| Issued | Product | Office | Lasted |
|---|---|---|---|
| Jul 10, 4:52 PM MST | Severe Thunderstorm Watch | SPC | 7 hr |
The nearest sounding before it
Phoenix, AZ (KPSR), launched 00:00Z, 3.3 hours before the alert went out and 52 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
- 965 J/kg
- Mixed-layer CIN
- -311 J/kg
- Mixed-layer LCL
- 3378 m above ground
- 0-6 km bulk shear
- 32 kt
- 0-1 km storm-relative helicity
- 2 m²/s²
- 0-3 km storm-relative helicity
- 116 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- -0.0
The text
As transmitted.
425
WUUS55 KPSR 110316
SVRPSR
AZC013-021-110400-
/O.NEW.KPSR.SV.W.0021.210711T0316Z-210711T0400Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Phoenix AZ
816 PM MST Sat Jul 10 2021
The National Weather Service in Phoenix has issued a
* Severe Thunderstorm Warning for...
Maricopa County in south central Arizona...
Pinal County in southeastern Arizona...
* Until 900 PM MST.
* At 816 PM MST, severe thunderstorms were located along a line
extending from Falcon Field Airport to Queen Creek to Blackwater,
moving west at 20 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, Glendale, Scottsdale, Gilbert, Tempe,
Avondale, Goodyear, Buckeye, Casa Grande, Apache Junction, Paradise
Valley, Coolidge and Tolleson.
* This includes the following highways...
AZ Interstate 10 between mile markers 121 and 199.
AZ Interstate 17 between mile markers 195 and 209.
AZ Interstate 8 between mile markers 135 and 178.
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 these storms. 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 these storms, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.
&&
LAT...LON 3296 11250 3343 11256 3360 11223 3353 11161
3327 11147 3295 11147 3276 11176 3280 11178
3276 11205 3273 11205 3272 11214 3268 11215
3268 11220 3264 11224
TIME...MOT...LOC 0316Z 078DEG 19KT 3344 11170 3323 11165 3301 11156
HAIL...0.75IN
WIND...60MPH
$$
SDB1 follow-up statement
865
WWUS55 KPSR 110341
SVSPSR
Severe Weather Statement
National Weather Service Phoenix AZ
841 PM MST Sat Jul 10 2021
AZC013-021-110400-
/O.CON.KPSR.SV.W.0021.000000T0000Z-210711T0400Z/
Maricopa AZ-Pinal AZ-
841 PM MST Sat Jul 10 2021
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 900 PM MST
FOR MARICOPA AND PINAL COUNTIES...
At 840 PM MST, the leading edge of very strong outflow winds from
thunderstorms was located along a line extending from 7 miles west
of South Mountain Park to 11 miles southeast of Estrella Mountain
Park to near Estrella Sailport to 11 miles east of Freeman, moving
west at 40 mph.
HAZARD...70 mph wind gusts and penny size hail.
SOURCE...Radar indicated.
IMPACT...Expect considerable tree damage. Damage is likely to mobile
homes, roofs, and outbuildings.
Locations impacted include...
Phoenix, Mesa, Chandler, Glendale, Scottsdale, Gilbert, Tempe,
Avondale, Goodyear, Buckeye, Casa Grande, Apache Junction, Paradise
Valley, Coolidge and Tolleson.
This includes the following highways...
AZ Interstate 10 between mile markers 121 and 199.
AZ Interstate 17 between mile markers 195 and 209.
AZ Interstate 8 between mile markers 135 and 178.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
Continuous cloud to ground lightning is occurring with these storms.
Move indoors immediately. Lightning is one of nature's leading
killers. Remember, if you can hear thunder, you are close enough to
be struck by lightning.
Torrential rainfall is occurring with these storms, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.
&&
LAT...LON 3296 11250 3343 11256 3360 11223 3353 11161
3327 11147 3295 11147 3276 11176 3280 11178
3276 11205 3273 11205 3272 11214 3268 11215
3268 11220 3264 11224
TIME...MOT...LOC 0340Z 075DEG 35KT 3332 11220 3320 11223 3306 11220
3288 11211
HAIL...0.75IN
WIND...70MPH
$$
SDBThe office that day
Everything else NWS Phoenix, AZ issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 10, 5:37 PM MST | Special Weather Statement | PSR | Gila | 38 min |
| Jul 10, 5:45 PM MST | Severe Thunderstorm Warning | PSR | Gila | 45 min |
| Jul 10, 6:06 PM MST | Special Weather Statement | PSR | Gila | 39 min |
| Jul 10, 6:24 PM MST | Severe Thunderstorm Warning | PSR | Gila, Maricopa, Pinal | 36 min |
| Jul 10, 6:42 PM MST | Severe Thunderstorm Warning | PSR | Maricopa | 33 min |
| Jul 10, 7:00 PM MST | Severe Thunderstorm Warning | PSR | Gila, Maricopa, Pinal | 45 min |
| Jul 10, 7:10 PM MST | Flash Flood Warning | PSR | Gila | 4 hr |
| Jul 10, 7:12 PM MST | Severe Thunderstorm Warning | PSR | Maricopa | 33 min |
| Jul 10, 7:27 PM MST | Dust Storm Warning | PSR | Maricopa | 63 min |
| Jul 10, 7:31 PM MST | Dust Storm Warning | PSR | Maricopa, Pinal | 59 min |
| Jul 10, 7:45 PM MST | Severe Thunderstorm Warning | PSR | Maricopa, Pinal | 30 min |
| Jul 10, 8:29 PM MST | Dust Storm Warning | PSR | Maricopa, Pinal | 91 min |
| Jul 10, 8:42 PM MST | Areal Flood Advisory | PSR | Maricopa, Pinal | 3 hr |
| Jul 10, 9:00 PM MST | Severe Thunderstorm Warning | PSR | Maricopa, Pinal | 45 min |
| Jul 10, 9:48 PM MST | Special Weather Statement | PSR | 57 min | |
| Jul 10, 9:54 PM MST | Special Weather Statement | PSR | Pinal | 36 min |
| Jul 10, 10:25 PM MST | Special Weather Statement | PSR | 35 min | |
| Jul 10, 10:31 PM MST | Dust Storm Advisory | PSR | Maricopa, Yuma | 89 min |
| Jul 10, 10:43 PM MST | Dust Storm Warning | PSR | Maricopa, Yuma | 62 min |
| Jul 10, 11:19 PM MST | Dust Storm Warning | PSR | Yuma | 56 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.