Hazardous Weather Outlook
Issued by NWS Quad Cities, IA IL

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FLUS43 KDVN 190922

Hazardous Weather Outlook
National Weather Service Quad Cities IA IL
422 AM CDT Wed Jul 19 2017

Henry IA-Des Moines-Van Buren-Lee-Jo Daviess-Stephenson-Carroll-
Whiteside-Rock Island-Henry IL-Bureau-Putnam-Mercer-Henderson-
422 AM CDT Wed Jul 19 2017

This Hazardous Weather Outlook is for portions of north central
Illinois...northwest Illinois...west central Illinois...east
central Iowa...northeast Iowa...southeast Iowa and northeast


Hot and humid conditions are expected today with afternoon heat
index readings as high as 100 to 102. Heat advisories and heat
warnings are in effect for portions of the outlook area beginning
this afternoon.

A complex of thunderstorms may move into eastern Iowa and
northwest Illinois late tonight. These storms may be severe, with
the potential for widespread damaging winds. Heavy rainfall will
also be possible. The storm prediction center has a slight risk
north of a line from Cedar Rapids through the Quad Cities to
Walnut Illinois. There is an enhanced risk for severe weather along
and north of the highway 20 corridor of eastern Iowa.


Thursday through Saturday...several rounds of thunderstorm complexes
will push across portions of the outlook area, mainly along and
north of Interstate 80. There is the potential for these storms to
be severe with damaging winds and large hail. Torrential rainfall is
likely with several inches of rain possible in a short time. This
could lead to localized flash flooding. However, confidence is low
on the timing and exact location of the thunderstorm complexes.

Hot and humid conditions can be expected through Saturday. The
hotter temperatures should generally occur near and south of
Interstate 80. Temperatures are expected to push well into the 90s
with dewpoints well into the 70s to around 80. This will soar heat
index values to 100 to 106 almost every afternoon through Saturday.
But cloud cover and storm outflow may bring temporary cool downs to
the ambient temperatures, especially north of Interstate 80.

An Excessive Heat Warning is in effect through Saturday for areas
generally near and south of a line from Sigourney Iowa, to Wapello
and Aledo Illinois. A Heat Advisory is in effect through Saturday
generally for the counties along the Interstate 80 corridor.


Storm spotter activation may be needed tonight in east central
Iowa and northwest Illinois.



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