Severe Thunderstorm Watch 521

Issued

Aug 19, 2022, 3:04 PM CDT (20:04 UTC)

Expired

Aug 19, 2022, 8:00 PM CDT

In force

5 hr

Issued by

the Storm Prediction Center

Largest hail expected

2 in

Strongest gust expected

55 kt

The Des Moines radar (KDMX), 75 km from the middle of the area, began a volume at 20:06 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

10%

One or more EF2 to EF5 tornadoes

5%

Ten or more severe wind reports

20%

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

60%

• Mesoscale Discussion 1698 Severe potential...watch possibleAug 19, 2:31 PM CDT

833 
WWUS20 KWNS 192001
SEL1  
SPC WW 192001
IAZ000-MOZ000-200100-

URGENT - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Watch Number 521
NWS Storm Prediction Center Norman OK
305 PM CDT Fri Aug 19 2022

The NWS Storm Prediction Center has issued a

* Severe Thunderstorm Watch for portions of 
  Central, southern, and eastern Iowa
  Northern Missouri

* Effective this Friday afternoon and evening from 305 PM until
  800 PM CDT.

* Primary threats include...
  Scattered large hail and isolated very large hail events to 2
    inches in diameter possible
  Isolated damaging wind gusts to 65 mph possible

SUMMARY...Several discrete cells will pose a threat for mainly hail
up to golf ball size. These may consolidate into small clusters with
a threat for isolated damaging winds as well.

The severe thunderstorm watch area is approximately along and 60
statute miles east and west of a line from 45 miles south southwest
of Lamoni IA to 20 miles east northeast of Waterloo IA. For a
complete depiction of the watch see the associated watch outline
update (WOUS64 KWNS WOU1).

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 55 knots. A
few cumulonimbi with maximum tops to 500. Mean storm motion vector
29025.

...Grams

Severe Thunderstorm Watches in Iowa, 2022Severe Thunderstorm Watches in Missouri, 2022Every severe thunderstorm watch in 2022

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.