SPC Severe Thunderstorm Watch 646



WW 646 SEVERE TSTM CO KS NE WY 112030Z – 120400Z

WW 0646 Image

URGENT - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Watch Number 646
NWS Storm Prediction Center Norman OK
230 PM MDT Wed Sep 11 2019

The NWS Storm Prediction Center has issued a

* Severe Thunderstorm Watch for portions of 
  Northeast Colorado
  Northwest Kansas
  Western and Central Nebraska
  Southeast Wyoming

* Effective this Wednesday afternoon and evening from 230 PM
  until 1000 PM MDT.

* Primary threats include...
  Widespread large hail and isolated very large hail events to 3
    inches in diameter likely
  Scattered damaging wind gusts to 70 mph likely
  A tornado or two possible

SUMMARY...Thunderstorms are expected to rapidly develop this
afternoon and overspread much of the watch area this afternoon and
early evening.  Supercells capable of large, damaging hail are the
main concern.  However, an isolated tornado or two cannot be ruled
out.

The severe thunderstorm watch area is approximately along and 95
statute miles north and south of a line from 25 miles east of North
Platte NE to 30 miles north of Cheyenne WY. For a complete depiction
of the watch see the associated watch outline update (WOUS64 KWNS
WOU6).

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 645...

AVIATION...A few severe thunderstorms with hail surface and aloft to
3 inches. Extreme turbulence and surface wind gusts to 60 knots. A
few cumulonimbi with maximum tops to 500. Mean storm motion vector
27030.

...Hart

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