SPC Severe Thunderstorm Watch 170



WW 170 SEVERE TSTM IA IL IN NE 170055Z – 170800Z

WW 0170 Image

URGENT - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Watch Number 170
NWS Storm Prediction Center Norman OK
755 PM CDT Thu May 16 2019

The NWS Storm Prediction Center has issued a

* Severe Thunderstorm Watch for portions of 
  Iowa
  Northern Illinois
  Northwest Indiana
  Eastern Nebraska

* Effective this Thursday night and Friday morning from 755 PM
  until 300 AM CDT.

* Primary threats include...
  Scattered large hail likely with isolated very large hail events
    to 2 inches in diameter possible
  Isolated damaging wind gusts to 70 mph possible

SUMMARY...Widely scattered thunderstorms will continue to increase
across the region this evening. A very unstable environment,
accentuated by very steep mid-level lapse rates, will support storms
capable of large hail as the primary hazard. Storms could eventually
organize with some potential for damaging winds as well.

The severe thunderstorm watch area is approximately along and 45
statute miles north and south of a line from 15 miles south
southwest of Sioux City IA to 75 miles east southeast of Marseilles
IL. 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 inches. Extreme turbulence and surface wind gusts to 60 knots. A
few cumulonimbi with maximum tops to 550. Mean storm motion vector
28020.

...Guyer

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