Severe Thunderstorm Watch 388

Issued

Jul 23, 2021, 6:02 PM MDT (00:02 UTC)

Expired

Jul 24, 2021, 1:00 AM MDT

In force

7 hr

Issued by

the Storm Prediction Center

Largest hail expected

2 in

Strongest gust expected

65 kt

The Bismarck radar (KBIS), 99 km from the middle of the area, began a volume at 00:02 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

5%

One or more EF2 to EF5 tornadoes

2%

Ten or more severe wind reports

50%

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

30%

Six or more combined severe hail and wind reports

80%

• Mesoscale Discussion 1334 Severe potential...watch possibleJul 23, 4:04 PM MDT
• Mesoscale Discussion 1336 Severe potential...watch unlikelyJul 23, 8:07 PM MDT
• Mesoscale Discussion 1337 Severe thunderstorm watch 388Jul 23, 9:33 PM MDT

301 
WWUS20 KWNS 240000
SEL8  
SPC WW 240000
NDZ000-SDZ000-240700-

URGENT - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Watch Number 388
NWS Storm Prediction Center Norman OK
700 PM CDT Fri Jul 23 2021

The NWS Storm Prediction Center has issued a

* Severe Thunderstorm Watch for portions of 
  Southern North Dakota
  Northern South Dakota

* Effective this Friday night and Saturday morning from 700 PM
  until 200 AM CDT.

* Primary threats include...
  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...Upscale organization of initially isolated strong-severe
thunderstorms is possible over western parts of the watch area, on
either side of the ND/SD line.  Activity initially poses a mixed
large-hail and damaging-wind threat, which would transition more to
wind in the event of a forward-propagating MCS/cold-pool evolution
into a moisture-rich air mass farther east, as forecast by some
near-term model guidance.

The severe thunderstorm watch area is approximately along and 65
statute miles north and south of a line from 30 miles west southwest
of Lemmon SD to 60 miles north northeast of Watertown SD. For a
complete depiction of the watch see the associated watch outline
update (WOUS64 KWNS WOU8).

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 387...

AVIATION...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 550. Mean storm motion vector
28035.

...Edwards

Severe Thunderstorm Watches in South Dakota, 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.