Hazardous Weather Outlook
Issued by NWS Quad Cities, IA IL

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FLUS43 KDVN 180923

Hazardous Weather Outlook
National Weather Service Quad Cities IA IL
423 AM CDT Tue Jul 18 2017

Henry IA-Des Moines-Van Buren-Lee-Jo Daviess-Stephenson-Carroll-
Whiteside-Rock Island-Henry IL-Bureau-Putnam-Mercer-Henderson-
423 AM CDT Tue Jul 18 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


Isolated thunderstorms are possible this afternoon over eastern
Iowa. Thunderstorms are more likely this evening and overnight,
mainly north of Interstate 80 across eastern Iowa and northwest
Illinois. There is a low potential for severe storms, with
damaging winds and heavy rainfall the primary threats.

Heat and humidity will be on the increase with afternoon heat
index readings as high as the mid 90s to near 100.


Wednesday through Saturday...several rounds of thunderstorm
complexes will push across portions of the outlook area, mainly
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 for much of this work week
and into the upcoming weekend. 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 107 almost
every afternoon from Wednesday through Sunday.

An Excessive Heat Watch is in effect for Wednesday through
Saturday for areas generally near and south of a line from Belle
Plaine, Iowa to Sherrard, Illinois. Heat Advisories and Excessive
Heat Warnings may eventually be needed to replace the watch.


Spotter activation is not anticipated for today, but may be needed
this evening north of interstate 80.



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