Severe Thunderstorm Watch 283

Issued

Jun 18, 2021, 10:08 PM CDT (03:08 UTC)

Expired

Jun 19, 2021, 6:00 AM CDT

In force

8 hr

Issued by

the Storm Prediction Center

Largest hail expected

2.5 in

Strongest gust expected

60 kt

The Des Moines radar (KDMX), 95 km from the middle of the area, began a volume at 03:10 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

2%

Ten or more severe wind reports

50%

One or more gusts of 65 knots or more

10%

Ten or more severe hail reports

70%

One or more hailstones of 2 inches or more

40%

Six or more combined severe hail and wind reports

95%

• Mesoscale Discussion 1002 Severe potential...watch likelyJun 18, 8:53 PM CDT
• Mesoscale Discussion 1003 Severe potential...watch likelyJun 18, 9:27 PM CDT
• Mesoscale Discussion 1007 Severe thunderstorm watch 282...283Jun 19, 2:10 AM CDT

332 
WWUS20 KWNS 190306
SEL3  
SPC WW 190306
IAZ000-ILZ000-MOZ000-NEZ000-191000-

URGENT - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Watch Number 283
NWS Storm Prediction Center Norman OK
1005 PM CDT Fri Jun 18 2021

The NWS Storm Prediction Center has issued a

* Severe Thunderstorm Watch for portions of 
  Southern and Eastern Iowa
  Western Illinois
  Northern Missouri
  Southeast Nebraska

* Effective this Friday night and Saturday morning from 1005 PM
  until 500 AM CDT.

* Primary threats include...
  Scattered large hail likely with isolated very large hail events
    to 2.5 inches in diameter possible
  Scattered damaging wind gusts to 70 mph possible
  A tornado or two possible

SUMMARY...Multiple corridors of strong to severe storm development
are expected late this evening including across southern Iowa as
well as southeast Nebraska into northern Missouri. The strongest
storms will be capable of large hail. Damaging winds will also be a
possibility, particularly if a well-organized linear cluster evolves
through the early overnight hours as storms spread
east-southeastward across the region.

The severe thunderstorm watch area is approximately along and 65
statute miles north and south of a line from 25 miles west of
Shenandoah IA to 30 miles east southeast of Burlington IA. For a
complete depiction of the watch see the associated watch outline
update (WOUS64 KWNS WOU3).

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 280...WW 281...WW 282...

AVIATION...A few severe thunderstorms with hail surface and aloft to
2.5 inches. Extreme turbulence and surface wind gusts to 60 knots. A
few cumulonimbi with maximum tops to 600. Mean storm motion vector
29025.

...Guyer

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