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URGENT - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Watch Number 219
NWS Storm Prediction Center Norman OK
1150 PM CDT Mon May 15 2017
The NWS Storm Prediction Center has issued a
* Severe Thunderstorm Watch for portions of
Far northeast Nebraska
Southeast South Dakota
* Effective this Monday night and Tuesday morning from 1150 PM
until 500 AM CDT.
* Primary threats include...
Isolated very large hail events to 2 inches in diameter possible
Isolated damaging wind gusts to 70 mph possible
SUMMARY...Strong to locally severe thunderstorms will continue to
develop northeastward across the region through the overnight hours.
Steep lapse rates and moderate elevated instability will support the
possibility of severe hail and perhaps locally damaging winds. These
storms have a history of producing severe-caliber wind gusts across
The severe thunderstorm watch area is approximately along and 45
statute miles north and south of a line from 25 miles west of
Yankton SD to 25 miles north northeast of Spencer IA. For a complete
depiction of the watch see the associated watch outline update
(WOUS64 KWNS WOU9).
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 214...WW 215...WW
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