SPC Severe Thunderstorm Watch 420

WW 420 SEVERE TSTM IA MN 191735Z - 192300Z

URGENT - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Watch Number 420
NWS Storm Prediction Center Norman OK
1235 PM CDT Wed Jul 19 2017

The NWS Storm Prediction Center has issued a

* Severe Thunderstorm Watch for portions of 
  Northern Iowa
  Southern Minnesota

* Effective this Wednesday afternoon and evening from 1235 PM
  until 600 PM CDT.

* Primary threats include...
  Widespread damaging winds likely with isolated significant gusts
    to 80 mph possible
  Scattered large hail and isolated very large hail events to 2
    inches in diameter possible
  A tornado or two possible

SUMMARY...A small but intense bow echo will move rapidly
east-southeastward across the watch area this afternoon.  Damaging
winds along the leading edge of the bow are the primary risk, along
with hail and perhaps a tornado or two.

The severe thunderstorm watch area is approximately along and 45
statute miles north and south of a line from 55 miles west northwest
of Worthington MN to 25 miles northeast of Mason City IA. 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.

&&

OTHER WATCH INFORMATION...CONTINUE...WW 419...

AVIATION...A few severe thunderstorms with hail surface and aloft to
2 inches. Extreme turbulence and surface wind gusts to 70 knots. A
few cumulonimbi with maximum tops to 500. Mean storm motion vector
29040.

...Hart

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