URGENT - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Watch Number 460
NWS Storm Prediction Center Norman OK
1135 AM CDT Mon Aug 21 2017
The NWS Storm Prediction Center has issued a
* Severe Thunderstorm Watch for portions of
Northwest Iowa
Southwest Minnesota
Northeast Nebraska
Southeast South Dakota
* Effective this Monday morning and evening from 1135 AM until
700 PM 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...Cluster of severe storms over south-central South Dakota
should continue east-southeast with additional storm development
possible to its south and east. A swath of large hail and damaging
winds is expected this afternoon.
The severe thunderstorm watch area is approximately along and 75
statute miles north and south of a line from 45 miles south of
Chamberlain SD to 30 miles north of Storm Lake IA. For a complete
depiction of the watch see the associated watch outline update
(WOUS64 KWNS WOU0).
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 459...
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
29030.
...Grams
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