Severe Thunderstorm Watch 365

Issued

Jul 10, 2021, 2:01 PM CDT (19:01 UTC)

Expired

Jul 10, 2021, 10:00 PM CDT

In force

8 hr

Issued by

the Storm Prediction Center

Largest hail expected

2 in

Strongest gust expected

60 kt

The St Louis radar (KLSX), 103 km from the middle of the area, began a volume at 19:02 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

20%

One or more EF2 to EF5 tornadoes

5%

Ten or more severe wind reports

60%

One or more gusts of 65 knots or more

20%

Ten or more severe hail reports

40%

One or more hailstones of 2 inches or more

30%

Six or more combined severe hail and wind reports

90%

• Mesoscale Discussion 1238 Severe potential...watch likelyJul 10, 1:25 PM CDT
• Mesoscale Discussion 1246 Severe thunderstorm watch 365Jul 10, 5:33 PM CDT

639 
WWUS20 KWNS 101858
SEL5  
SPC WW 101858
ILZ000-MOZ000-110300-

URGENT - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Watch Number 365
NWS Storm Prediction Center Norman OK
200 PM CDT Sat Jul 10 2021

The NWS Storm Prediction Center has issued a

* Severe Thunderstorm Watch for portions of 
  Southern Illinois
  East-central and southeast Missouri

* Effective this Saturday afternoon and evening from 200 PM until
  1000 PM CDT.

* Primary threats include...
  Scattered damaging wind gusts to 70 mph likely
  Scattered large hail and isolated very large hail events to 2
    inches in diameter possible
  A tornado or two possible

SUMMARY...Severe thunderstorms are expected to develop and move east
this afternoon and evening with a risk for damaging winds and
isolated large hail.  A tornado or two is also possible.

The severe thunderstorm watch area is approximately along and 70
statute miles north and south of a line from 40 miles west southwest
of Farmington MO to 50 miles east of Mount Vernon IL. For a complete
depiction of the watch see the associated watch outline update
(WOUS64 KWNS WOU5).

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.

&&

AVIATION...A few severe thunderstorms with hail surface and aloft to
2 inches. Extreme turbulence and surface wind gusts to 60 knots. A
few cumulonimbi with maximum tops to 500. Mean storm motion vector
26035.

...Bunting

Severe Thunderstorm Watches in Illinois, 2021Severe Thunderstorm Watches in Missouri, 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.