Regional Weather Summary
Issued by NWS Des Moines, IA

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AWUS83 KDMX 190926

Weather Summary for Iowa
National Weather Service Des Moines IA
426 AM CDT Wed Jul 19 2017

Isolated to scattered thunderstorms festered over the state overnight.
Earlier in the night the main area to see storms was along and near
the highway 30 corridor and toward morning, storms developed over
southwest Iowa. Overnight temperatures as of 4 AM were largely in the
70`s with dewpoints not lagging much behind, making for very humid
conditions. The wind as light and variable with plenty of mid and high
level cloud cover from the storms overnight.

The overall pattern and thus the weather story has not changed. We
will continue to see oppressive heat and humidity across southern into
central Iowa and locations south where excessive heat warnings and
heat advisories are in effect. Across northern Iowa and locations
north, the heat and humidity will not be quite as bad however a
frontal boundary waffling across the area will bring chances for
thunderstorms. A few storms could be severe tonight with large hail
and damaging wind possible. In addition, very heavy rainfall is
possible with the storms.

Saturday night into early next week we will finally see a pattern
shift as a large upper ridge of high pressure builds to the west with
a low over the Great Lakes. This will put the Upper Midwest in a
northwest flow and drive the frontal boundary south and east of the
region bringing cooler temperatures back to the area. Highs through
Saturday will be in the mid to upper 90`s with upper 80`s north. Heat
indices south through Saturday will be in the 105 to 110 range. Sunday
into next week, temperatures will be in the upper 70`s north to the
mid 80`s south.


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