Tornado Watch 563

Issued

Dec 15, 2021, 1:23 PM CST (19:23 UTC)

Expired

Dec 15, 2021, 8:00 PM CST

In force

7 hr

Issued by

the Storm Prediction Center

Largest hail expected

1 in

Strongest gust expected

80 kt

The Omaha radar (KOAX), 28 km from the middle of the area, began a volume at 19:22 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

70%

One or more EF2 to EF5 tornadoes

40%

Ten or more severe wind reports

90%

One or more gusts of 65 knots or more

70%

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

95%

• Mesoscale Discussion 2027 Severe potential...tornado watch likelyDec 15, 12:28 PM CST
• Mesoscale Discussion 2028 Severe potential...watch possibleDec 15, 2:29 PM CST
• Mesoscale Discussion 2029 Tornado watch 563Dec 15, 2:30 PM CST
• Mesoscale Discussion 2030 Tornado watch 563Dec 15, 3:55 PM CST
• Mesoscale Discussion 2032 Severe potential...watch likely 563Dec 15, 4:51 PM CST
• Mesoscale Discussion 2033 Severe thunderstorm watch 564Dec 15, 5:01 PM CST
• Mesoscale Discussion 2034 Tornado watch 563Dec 15, 5:16 PM CST
• Mesoscale Discussion 2036 Tornado watch 565Dec 15, 7:11 PM CST
• Mesoscale Discussion 2037 Severe thunderstorm watch 566Dec 15, 7:14 PM CST

089 
WWUS20 KWNS 151921
SEL3  
SPC WW 151921
IAZ000-KSZ000-MNZ000-MOZ000-NEZ000-SDZ000-160200-

URGENT - IMMEDIATE BROADCAST REQUESTED
Tornado Watch Number 563
NWS Storm Prediction Center Norman OK
120 PM CST Wed Dec 15 2021

The NWS Storm Prediction Center has issued a

* Tornado Watch for portions of 
  Western and central Iowa
  Northeastern Kansas
  South central Minnesota
  Northwestern Missouri
  Easterm Nebraska
  Extreme southeastern South Dakota

* Effective this Wednesday afternoon and evening from 120 PM
  until 800 PM CST.

* Primary threats include...
  A few tornadoes likely with a couple intense tornadoes possible
  Widespread damaging winds and isolated significant gusts to 90
    mph likely
  Isolated large hail events to 1 inch in diameter possible

SUMMARY...A developing squall line will move rapidly northeastward
from northern Kansas and Nebraska across Iowa and adjacent areas of
Minnesota and Missouri through this evening.  Widespread damaging
winds are expected, with peak gusts near 90 mph possible.  A mix of
embedded supercells and smaller-scale circulations in the line will
also pose a threat for tornadoes, with a strong tornado or two
possible.

The tornado watch area is approximately along and 110 statute miles
north and south of a line from 15 miles southwest of Hastings NE to
50 miles south southeast of Mason City IA. For a complete depiction
of the watch see the associated watch outline update (WOUS64 KWNS
WOU3).

PRECAUTIONARY/PREPAREDNESS ACTIONS...

REMEMBER...A Tornado Watch means conditions are favorable for
tornadoes and 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.

&&

AVIATION...Tornadoes and a few severe thunderstorms with hail
surface and aloft to 1 inch. Extreme turbulence and surface wind
gusts to 80 knots. A few cumulonimbi with maximum tops to 450. Mean
storm motion vector 23060.

...Thompson

Tornado Watches in Iowa, 2021Tornado Watches in Nebraska, 2021Tornado Watches in Kansas, 2021Every tornado 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.