Tornado Watch 197

Issued

May 23, 2021, 1:50 PM MDT (19:50 UTC)

Expired

May 23, 2021, 9:00 PM MDT

In force

7 hr

Issued by

the Storm Prediction Center

Largest hail expected

2 in

Strongest gust expected

65 kt

The Rapid City radar (KUDX), 116 km from the middle of the area, began a volume at 19:50 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

50%

One or more EF2 to EF5 tornadoes

20%

Ten or more severe wind reports

50%

One or more gusts of 65 knots or more

40%

Ten or more severe hail reports

50%

One or more hailstones of 2 inches or more

40%

Six or more combined severe hail and wind reports

90%

• Mesoscale Discussion 708 Severe potential...watch likelyMay 23, 10:53 AM MDT
• Mesoscale Discussion 710 Severe potential...watch likelyMay 23, 12:58 PM MDT
• Mesoscale Discussion 711 Tornado watch 196May 23, 1:57 PM MDT
• Mesoscale Discussion 715 Tornado watch 197May 23, 5:25 PM MDT
• Mesoscale Discussion 717 Tornado watch 196May 23, 6:53 PM MDT
• Mesoscale Discussion 718 Tornado watch 197May 23, 7:22 PM MDT

033 
WWUS20 KWNS 231947
SEL7  
SPC WW 231947
NDZ000-SDZ000-WYZ000-240300-

URGENT - IMMEDIATE BROADCAST REQUESTED
Tornado Watch Number 197
NWS Storm Prediction Center Norman OK
150 PM MDT Sun May 23 2021

The NWS Storm Prediction Center has issued a

* Tornado Watch for portions of 
  Southwest North Dakota
  Western South Dakota
  Northeast Wyoming

* Effective this Sunday afternoon and evening from 150 PM until
  900 PM MDT.

* Primary threats include...
  A few tornadoes possible
  Scattered damaging winds and isolated significant gusts to 75
    mph possible
  Scattered large hail and isolated very large hail events to 2
    inches in diameter possible

SUMMARY...Severe thunderstorms are expected to quickly develop and
race northeastward as a warm front otherwise continues to spread
northward across South Dakota and eventually reaches southern North
Dakota. Supercells capable of large hail and a couple of tornadoes
are initially expected, although storms may merge into clusters by
late afternoon/early evening with a continued damaging wind and some
tornado risk.

The tornado watch area is approximately along and 80 statute miles
east and west of a line from 30 miles north northeast of Lemmon SD
to 70 miles south of Rapid City SD. For a complete depiction of the
watch see the associated watch outline update (WOUS64 KWNS WOU7).

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.

&&

OTHER WATCH INFORMATION...CONTINUE...WW 196...

AVIATION...Tornadoes and a few severe thunderstorms with hail
surface and aloft to 2 inches. Extreme turbulence and surface wind
gusts to 65 knots. A few cumulonimbi with maximum tops to 500. Mean
storm motion vector 20040.

...Guyer

Tornado Watches in South Dakota, 2021Tornado Watches in North Dakota, 2021Tornado Watches in Wyoming, 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.