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Minnesota, Le Sueur

Severe Thunderstorm Watch

Statement as of 1:05 AM CDT on August 21, 2014

Expires 8:00 AM EDT on August 21, 2014


The NWS Storm Prediction Center has issued a

* Severe Thunderstorm Watch for portions of
southern Minnesota

* effective this Thursday morning from 105 am until 700 am CDT.

* Primary threats include...
isolated large hail events to 1.5 inches in diameter possible

The Severe Thunderstorm Watch area is approximately along and 60
statute miles north and south of a line from 60 miles southwest
of Alexandria Minnesota to 35 miles north northeast of Mankato
Minnesota. 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.


Discussion... thunderstorm development was underway across wrn MN
late tonight ahead of a shortwave trough and associated surface low
and warm front situated across the nrn plains. Lift occurring across
the warm front should continue to aid updraft development on the
edge of stronger capping inversion. Modest instability and
increasing shear should contribute to hail production from some of
the stronger cells. Downward momentum Transfer may also result in
gusty/stronger winds given relatively weak boundary layer
inhibition. Expect this convection to spread east across parts of
srn MN over the next several hours sustained by the shortwave trough
and enhanced mass transport on the nose of 40kt low level jet.

Aviation... a few severe thunderstorms with hail surface and aloft
to 1.5 inches. Extreme turbulence and surface wind gusts to 50
knots. A few cumulonimbi with maximum tops to 550. Mean storm
motion vector 27025.


... Carbin

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