SPC Severe Thunderstorm Watch 171



WW 171 SEVERE TSTM CO NE WY 171855Z – 180200Z

WW 0171 Image

URGENT - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Watch Number 171
NWS Storm Prediction Center Norman OK
1255 PM MDT Fri May 17 2019

The NWS Storm Prediction Center has issued a

* Severe Thunderstorm Watch for portions of 
  Northeast Colorado
  Southern Nebraska Panhandle
  Southeast Wyoming

* Effective this Friday afternoon and evening from 1255 PM until
  800 PM MDT.

* Primary threats include...
  Scattered large hail and isolated very large hail events to 2.5
    inches in diameter likely
  Scattered damaging wind gusts to 70 mph possible
  A tornado or two possible

SUMMARY...Thunderstorms are expected to intensify over northeast
Colorado and southeast Wyoming this afternoon, tracking across the
watch area.  The strongest cells will likely pose a risk of large
hail and perhaps damaging wind gusts.  A tornado cannot be ruled
out.

The severe thunderstorm watch area is approximately along and 75
statute miles north and south of a line from 10 miles west southwest
of Cheyenne WY to 20 miles east of Sidney NE. For a complete
depiction of the watch see the associated watch outline update
(WOUS64 KWNS WOU1).

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
22035.

...Hart

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