Severe Thunderstorm Watch 442

Issued

Aug 16, 2021, 3:54 PM MST (22:54 UTC)

Expired

Aug 17, 2021, 2:00 AM MST

In force

10 hr

Issued by

the Storm Prediction Center

Largest hail expected

1 in

Strongest gust expected

60 kt

Counties Cochise County, AZ, Gila County, AZ, Graham County, AZ, Maricopa County, AZ, Pima County, AZ, Pinal County, AZ, Santa Cruz County, AZ, Yavapai County, AZ

The Phoenix radar (KIWA), 2 km from the middle of the area, began a volume at 22:56 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

30%

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

10%

Six or more combined severe hail and wind reports

50%

• Mesoscale Discussion 1537 Severe potential...watch possibleAug 16, 3:01 PM MST
• Mesoscale Discussion 1539 Severe thunderstorm watch 442Aug 16, 6:21 PM MST
• Mesoscale Discussion 1540 Severe thunderstorm watch 442Aug 16, 9:23 PM MST
• Mesoscale Discussion 1541 Severe thunderstorm watch 442Aug 16, 11:39 PM MST

674 
WWUS20 KWNS 162250
SEL2  
SPC WW 162250
AZZ000-170700-

URGENT - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Watch Number 442
NWS Storm Prediction Center Norman OK
450 PM MDT Mon Aug 16 2021

The NWS Storm Prediction Center has issued a

* Severe Thunderstorm Watch for portions of 
  Central and south central Arizona

* Effective this Monday afternoon and Tuesday morning from 450 PM
  until 100 AM MDT.

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

SUMMARY...Thunderstorm clusters are expected to form and move
southward from the Mogollon Rim into the lower deserts of southern
Arizona through late evening and early tonight.  The strongest
storms will be capable of producing damaging outflow winds of 60-70
mph, as well as isolated large hail near 1 inch diameter.

The severe thunderstorm watch area is approximately along and 70
statute miles north and south of a line from 50 miles north
northwest of Gila Bend AZ to 40 miles south of Safford AZ. For a
complete depiction of the watch see the associated watch outline
update (WOUS64 KWNS WOU2).

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 441...

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
36015.

...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.