WWUS20 KWNS 172312
SPC WW 172312
URGENT – IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Watch Number 593
NWS Storm Prediction Center Norman OK
615 PM CDT Sat Aug 17 2019
The NWS Storm Prediction Center has issued a
* Severe Thunderstorm Watch for portions of
Eastern South Dakota
* Effective this Saturday night and Sunday morning from 615 PM
until 100 AM CDT.
* Primary threats include…
Scattered damaging winds likely with isolated significant gusts
to 75 mph possible
Scattered large hail and isolated very large hail events to 2
inches in diameter possible
A tornado or two possible
SUMMARY…Ongoing storms across south-central/northeast South Dakota
early this evening will continue eastward, with the possibility of
additional/more isolated supercell development ahead of an evolving
cluster of storms. Some tornado risk may exist for a time,
particularly through mid-evening across southeast South Dakota.
However, the overall most common risks should be large hail and
damaging winds, which should become more of a concern later this
evening as storm mergers occur and a more organized cluster/line
The severe thunderstorm watch area is approximately along and 130
statute miles north and south of a line from 30 miles north
northeast of Worthington MN to 45 miles west southwest of Huron SD.
For a complete depiction of the watch see the associated watch
outline update (WOUS64 KWNS WOU3).
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