Severe Thunderstorm Watch 514

Issued

Oct 9, 2021, 2:56 PM CDT (19:56 UTC)

Expired

Oct 9, 2021, 10:00 PM CDT

In force

7 hr

Issued by

the Storm Prediction Center

Largest hail expected

1.5 in

Strongest gust expected

65 kt

The Aberdeen radar (KABR), 90 km from the middle of the area, began a volume at 19:59 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

70%

One or more gusts of 65 knots or more

30%

Ten or more severe hail reports

40%

One or more hailstones of 2 inches or more

20%

Six or more combined severe hail and wind reports

90%

• Mesoscale Discussion 1812 Severe potential...watch likelyOct 9, 12:04 PM CDT
• Mesoscale Discussion 1814 Severe thunderstorm watch 514Oct 9, 3:40 PM CDT
• Mesoscale Discussion 1816 Severe thunderstorm watch 514Oct 9, 6:00 PM CDT
• Mesoscale Discussion 1817 Severe thunderstorm watch 514...515Oct 9, 8:27 PM CDT

478 
WWUS20 KWNS 091954
SEL4  
SPC WW 091954
MNZ000-NDZ000-SDZ000-100300-

URGENT - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Watch Number 514
NWS Storm Prediction Center Norman OK
255 PM CDT Sat Oct 9 2021

The NWS Storm Prediction Center has issued a

* Severe Thunderstorm Watch for portions of 
  Western Minnesota
  Southeast North Dakota
  Eastern South Dakota

* Effective this Saturday afternoon and evening from 255 PM until
  1000 PM CDT.

* Primary threats include...
  Scattered damaging winds likely with isolated significant gusts
    to 75 mph possible
  Scattered large hail events to 1.5 inches in diameter possible
  A tornado or two possible

SUMMARY...Thunderstorms over central South Dakota are expected to
intensify this afternoon and spread rapidly northeastward across the
watch area.  Damaging winds are the main threat, but hail and an
isolated tornado or two are also possible.

The severe thunderstorm watch area is approximately along and 60
statute miles east and west of a line from 35 miles west southwest
of Mitchell SD to 80 miles northeast of Aberdeen SD. For a complete
depiction of the watch see the associated watch outline update
(WOUS64 KWNS WOU4).

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
1.5 inches. Extreme turbulence and surface wind gusts to 65 knots. A
few cumulonimbi with maximum tops to 450. Mean storm motion vector
24035.

...Hart

Severe Thunderstorm Watches in South Dakota, 2021Severe Thunderstorm Watches in Minnesota, 2021Severe Thunderstorm Watches in North Dakota, 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.