Severe Thunderstorm Watch 369

Issued

Jul 10, 2021, 4:52 PM MST (23:52 UTC)

Expired

Jul 10, 2021, 11:36 PM MST

In force

7 hr

Issued by

the Storm Prediction Center

Largest hail expected

1 in

Strongest gust expected

60 kt

Counties Gila County, AZ, Maricopa County, AZ, Pima County, AZ, Pinal County, AZ

The Phoenix radar (KIWA), 40 km from the middle of the area, began a volume at 23:53 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.

Two or more tornadoes

5%

One or more EF2 to EF5 tornadoes

2%

Ten or more severe wind reports

50%

One or more gusts of 65 knots or more

20%

Ten or more severe hail reports

20%

One or more hailstones of 2 inches or more

20%

Six or more combined severe hail and wind reports

70%

• Mesoscale Discussion 1244 Severe potential...watch possibleJul 10, 2:48 PM MST
• Mesoscale Discussion 1250 Severe thunderstorm watch 369Jul 10, 6:55 PM MST

316 
WWUS20 KWNS 102349
SEL9  
SPC WW 102349
AZZ000-110700-

URGENT - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Watch Number 369
NWS Storm Prediction Center Norman OK
550 PM MDT Sat Jul 10 2021

The NWS Storm Prediction Center has issued a

* Severe Thunderstorm Watch for portions of 
  South central Arizona

* Effective this Saturday afternoon and Sunday morning from 550
  PM until 100 AM MDT.

* Primary threats include...
  Scattered damaging wind gusts to 70 mph possible
  Isolated large hail events to 1 inch in diameter possible

SUMMARY...Thunderstorms forming over the mountains of southeast
Arizona and along the Mogollon Rim are expected to increase in
coverage and intensity the next few hours, and the storms could
evolve into a larger storm cluster and spread west-southwestward
into the lower deserts later this evening into early tonight.  The
primary severe threats will be damaging outflow winds of 60-70 mph
and isolated large hail near 1 inch diameter.

The severe thunderstorm watch area is approximately along and 85
statute miles east and west of a line from 40 miles northeast of
Phoenix AZ to 70 miles west southwest of Tucson AZ. For a complete
depiction of the watch see the associated watch outline update
(WOUS64 KWNS WOU9).

PRECAUTIONARY/PREPAREDNESS ACTIONS...

REMEMBER...A Severe Thunderstorm Watch means conditions are
favorable for severe thunderstorms in and close to the watch area.
Persons in these areas should be on the lookout for threatening
weather conditions and listen for later statements and possible
warnings. Severe thunderstorms can and occasionally do produce
tornadoes.

&&

OTHER WATCH INFORMATION...CONTINUE...WW 365...WW 366...WW
367...WW 368...

AVIATION...A few severe thunderstorms with hail surface and aloft to
1 inch. Extreme turbulence and surface wind gusts to 60 knots. A few
cumulonimbi with maximum tops to 550. Mean storm motion vector
07025.

...Thompson

Severe Thunderstorm Watches in Arizona, 2021Every severe thunderstorm watch in 2021

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.