SPC Severe Thunderstorm Watch 644

WW 644 SEVERE TSTM IA MN 110545Z – 111100Z

WW 0644 Image

Severe Thunderstorm Watch Number 644
NWS Storm Prediction Center Norman OK
1245 AM CDT Wed Sep 11 2019

The NWS Storm Prediction Center has issued a

* Severe Thunderstorm Watch for portions of 
  Northern Iowa
  Southern Minnesota

* Effective this Wednesday morning from 1245 AM until 600 AM CDT.

* Primary threats include...
  Scattered damaging winds and isolated significant gusts to 75
    mph possible
  Isolated large hail events to 1 inch in diameter possible
  A tornado or two possible

SUMMARY...A complex of thunderstorms, having produced measured
severe winds and a brief tornado in the Sioux Falls area, is
expected to maintain some severe threat for a few more hours as it
moves astride a sharply defined front located very near the
Minnesota/Iowa border.  Damaging gusts will be the main concern,
though a tornado cannot be ruled out, and isolated hail also is
possible with cells ahead of the main complex.

The severe thunderstorm watch area is approximately along and 40
statute miles north and south of a line from 25 miles west southwest
of Fairmont MN to 45 miles northeast of Mason City IA. For a
complete depiction of the watch see the associated watch outline
update (WOUS64 KWNS WOU4).


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



AVIATION...A few severe thunderstorms with hail surface and aloft to
1 inch. Extreme turbulence and surface wind gusts to 65 knots. A few
cumulonimbi with maximum tops to 500. Mean storm motion vector


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