URGENT – IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Watch Number 637
NWS Storm Prediction Center Norman OK
240 PM MDT Sat Aug 12 2023
The NWS Storm Prediction Center has issued a
* Severe Thunderstorm Watch for portions of
Western South Dakota
* Effective this Saturday afternoon and evening from 240 PM until
900 PM MDT.
* Primary threats include…
Scattered damaging wind gusts to 70 mph possible
Scattered large hail events to 1.5 inches in diameter possible
SUMMARY…Initially isolated thunderstorms near the Black Hills will
gradually increase in coverage this evening as the storms develop
eastward east of the Black Hills. Large hail will be possible with
supercells through this evening. The risk for severe gusts will
probably increase once storm coverage increases.
The severe thunderstorm watch area is approximately along and 55
statute miles east and west of a line from 45 miles north northeast
of Rapid City SD to 80 miles south southwest of Philip SD. For a
complete depiction of the watch see the associated watch outline
update (WOUS64 KWNS WOU7).
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
OTHER WATCH INFORMATION…CONTINUE…WW 633…WW 634…WW
AVIATION…A few severe thunderstorms with hail surface and aloft to
1.5 inches. Extreme turbulence and surface wind gusts to 60 knots. A
few cumulonimbi with maximum tops to 500. Mean storm motion vector