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Excessive Heat Warning

National Weather Service Quad Cities IA IL
830 PM CDT Thu Jul 20 2017

...Extended Period of Dangerous Heat and Humidity Continues...

.A hot and humid air mass will remain over much of the area
through Saturday. The heat combined with the humidity will
continue to push peak heat index values over 100 degrees. At
night, heat indices will remain at or above 75 providing little
relief. The cumulative effects of consecutive days with heat
indices over 100 will increase the risk for heat related
illnesses for those spending time outside or without access to
air conditioning.

Jefferson-Henry IA-Des Moines-Van Buren-Lee-Rock Island-Henry IL-
Including the cities of Marengo, Iowa City, Tipton, Muscatine,
Davenport, Bettendorf, Sigourney, Washington, Wapello, Fairfield,
Mount Pleasant, Burlington, Keosauqua, Fort Madison, Moline,
Rock Island, Geneseo, Aledo, Oquawka, Monmouth, Carthage, Macomb,
Memphis, and Kahoka
830 PM CDT Thu Jul 20 2017


* Heat Index Values...up to 110 due to temperatures in the mid
  90s...and dewpoints in the mid to upper 70s.

* Timing...This evening through Saturday evening.

* Impacts...Increased risk for heat exhaustion or heat stroke
  for people spending time outside or living without air
  conditioning. Children and the elderly are most susceptible.
  Also, parked vehicles will become dangerously hot within


An Excessive Heat Warning means that a prolonged period of
dangerously hot temperatures and high humidity will occur.  This
combination will lead to a dangerous situation in which heat
illnesses are likely.  Drink plenty of fluids, stay in an air-
conditioned room, stay out of the sun, and check on relatives and
neighbors, especially the elderly.

Take extra precautions if you work or spend time outside.  When
possible, reschedule strenuous activities to early morning or
evening.  Know the signs and symptoms of heat exhaustion and heat
stroke.  Wear light weight and loose fitting clothing when
possible and drink plenty of water.

To reduce risk during outdoor work the occupational safety and
health administration recommends scheduling frequent rest breaks
in shaded or air conditioned environments.  Anyone overcome by
heat should be moved to a cool and shaded location.  Heat stroke
is an emergency, call 9 1 1.



Hazardous Weather Outlook

Hazardous Weather Outlook
National Weather Service Quad Cities IA IL
338 PM CDT Thu Jul 20 2017

Henry IA-Des Moines-Van Buren-Lee-Jo Daviess-Stephenson-Carroll-
Whiteside-Rock Island-Henry IL-Bureau-Putnam-Mercer-Henderson-
338 PM CDT Thu Jul 20 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


Thunderstorms with strong winds, small hail and torrential rainfall
will impact portions of eastern Iowa and northwest Illinois early
this morning. Heavy rain falling on areas already saturated from
recent storms may lead to localized flash flooding.

Later this afternoon and tonight, scattered thunderstorms may redevelop
across eastern Iowa and northwest Illinois. These storms will have the
potential to produce damaging wind, large hail and torrential rainfall.

Area rivers are expected to experience flooding. Please see the latest
Flood Statements and Flood Warnings for details.


Friday 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 Highway 30. Temperatures
are expected to push well into the 90s with dewpoints well into the
70s to around 80. This will push heat index values to 105 to 110 every
afternoon through Saturday. But cloud cover and storm outflow may bring
temporary cool downs to the ambient temperatures, especially north
of Highway 30.

Heat advisories and excessive heat warnings are in place for northeast
Missouri, much of eastern Iowa and west central Illinois through Saturday.
Please see the latest National Weather Service statements for details.

River flooding impacts could be high, especially on the Rock River
if the river basin does receive widespread 2 plus inches of rain. This
could result in flooding on the Mississippi River later next week.



U.S. Dept. of Commerce
NOAA National Weather Service
1325 East West Highway
Silver Spring, MD 20910
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