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SEL0
URGENT - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Watch Number 440
NWS Storm Prediction Center Norman OK
325 PM MDT Sat Aug 14 2021
The NWS Storm Prediction Center has issued a
* Severe Thunderstorm Watch for portions of
northeastern Colorado
northwestern Kansas
western Nebraska including the Panhandle
southwestern South Dakota
* Effective this Saturday afternoon and evening from 325 PM until
1100 PM MDT.
* Primary threats include...
Scattered large hail and isolated very large hail events to 2.5
inches in diameter possible
Scattered damaging wind gusts to 70 mph possible
SUMMARY...Thunderstorms are currently increasing in coverage near
the Black Hills of southwestern South Dakota, and should continue to
expand/spread south-southeastward with time over the next several
hours. Very large hail will likely remain the primary severe risk
initially, with damaging winds an increasing likelihood with time,
as storms grow upscale linearly into the evening.
The severe thunderstorm watch area is approximately along and 65
statute miles east and west of a line from 35 miles northeast of
Rapid City SD to 60 miles south of Imperial NE. 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.
&&
AVIATION...A few severe thunderstorms with hail surface and aloft to
2.5 inches. Extreme turbulence and surface wind gusts to 60 knots. A
few cumulonimbi with maximum tops to 500. Mean storm motion vector
33025.
...Goss
