WW 420 SEVERE TSTM MN ND SD WI 072045Z - 080600Z
URGENT - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Watch Number 420
NWS Storm Prediction Center Norman OK
345 PM CDT Fri Aug 7 2020
The NWS Storm Prediction Center has issued a
* Severe Thunderstorm Watch for portions of
southeastern North Dakota
northeastern South Dakota
* Effective this Friday afternoon and Saturday morning from 345
PM until 100 AM CDT.
* Primary threats include...
Scattered damaging wind gusts to 70 mph likely
Scattered large hail and isolated very large hail events to 2
inches in diameter possible
A tornado or two possible
SUMMARY...Severe thunderstorms, including a couple of supercells,
are expected to form across parts of the Red River Valley into west
central Minnesota late this afternoon, before consolidating into an
organizing cluster by early evening. This cluster of storms is
expected to then track east-southeastward across the remainder of
central Minnesota into northwestern Wisconsin by late evening.
Initial storms may pose a risk for severe hail, with some potential
for an isolated tornado or two, before strong wind gusts become the
primary severe hazard later this evening.
The severe thunderstorm watch area is approximately along and 65
statute miles north and south of a line from 45 miles southwest of
Detroit Lakes MN to 70 miles east northeast of Saint Cloud MN. For a
complete depiction of the watch see the associated watch outline
update (WOUS64 KWNS WOU0).
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
AVIATION...A few severe thunderstorms with hail surface and aloft to
2 inches. Extreme turbulence and surface wind gusts to 60 knots. A
few cumulonimbi with maximum tops to 550. Mean storm motion vector