Severe Local Storm Watch and Watch Cancellation Msg
Issued by NWS

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WWUS20 KWNS 182149
SPC WW 182149

Severe Thunderstorm Watch Number 456
NWS Storm Prediction Center Norman OK
450 PM CDT Fri Aug 18 2017

The NWS Storm Prediction Center has issued a

* Severe Thunderstorm Watch for portions of
  Northern and central Iowa
  Southern Minnesota

* Effective this Friday afternoon and Saturday morning from 450
  PM until 100 AM CDT.

* Primary threats include...
  Isolated damaging wind gusts to 70 mph possible
  Isolated large hail events to 1.5 inches in diameter possible

SUMMARY...A growing complex of strong to severe thunderstorms is
expected to move generally southeastward across the watch area
through this evening, offering occasional damaging gusts and
isolated severe hail.  Severe-storm potential becomes more uncertain
into central/southern Iowa later tonight; for now, the watch extends
to just south of the I-80 corridor.

The severe thunderstorm watch area is approximately along and 60
statute miles east and west of a line from 60 miles north northeast
of Worthington MN to 85 miles south southeast of Fort Dodge IA. For
a complete depiction of the watch see the associated watch outline
update (WOUS64 KWNS WOU6).


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
1.5 inches. Extreme turbulence and surface wind gusts to 60 knots. A
few cumulonimbi with maximum tops to 450. Mean storm motion vector

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