Severe Thunderstorm Watch 287

Issued

Jun 19, 2021, 2:43 PM CDT (19:43 UTC)

Expired

Jun 19, 2021, 10:00 PM CDT

In force

7 hr

Issued by

the Storm Prediction Center

Largest hail expected

2 in

Strongest gust expected

60 kt

The St Louis radar (KLSX), 64 km from the middle of the area, began a volume at 19:44 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

60%

One or more hailstones of 2 inches or more

30%

Six or more combined severe hail and wind reports

95%

• Mesoscale Discussion 1009 Severe potential...watch unlikelyJun 19, 11:15 AM CDT
• Mesoscale Discussion 1013 Severe potential...watch possibleJun 19, 2:12 PM CDT
• Mesoscale Discussion 1019 Severe thunderstorm watch 287Jun 19, 5:11 PM CDT
• Mesoscale Discussion 1025 Severe thunderstorm watch 287Jun 19, 9:49 PM CDT

591 
WWUS20 KWNS 191936
SEL7  
SPC WW 191936
ILZ000-MOZ000-200300-

URGENT - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Watch Number 287
NWS Storm Prediction Center Norman OK
240 PM CDT Sat Jun 19 2021

The NWS Storm Prediction Center has issued a

* Severe Thunderstorm Watch for portions of 
  West Central Illinois
  Eastern Missouri

* Effective this Saturday afternoon and evening from 240 PM until
  1000 PM CDT.

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

SUMMARY...Clusters of intense thunderstorms are expected to develop
this afternoon and sag southward across the watch area.  Very moist
and unstable conditions, along with favorable winds aloft, will
promote the risk of a few severe storms capable of damaging winds
and large hail.

The severe thunderstorm watch area is approximately along and 45
statute miles north and south of a line from 45 miles north of
Columbia MO to 40 miles east of Scott Afb IL. For a complete
depiction of the watch see the associated watch outline update
(WOUS64 KWNS WOU7).

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 285...

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
30025.

...Hart

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.