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Hazardous Weather Outlook

Hazardous Weather Outlook
National Weather Service Quad Cities IA IL
1135 AM CDT Fri Jul 21 2017

IAZ040>042-051>054-063>068-076>078-087>089-098-099-ILZ001-002-007-
009-015>018-024>026-034-035-MOZ009-010-221645-
Buchanan-Delaware-Dubuque-Benton-Linn-Jones-Jackson-Iowa-Johnson-
Cedar-Clinton-Muscatine-Scott-Keokuk-Washington-Louisa-Jefferson-
Henry IA-Des Moines-Van Buren-Lee-Jo Daviess-Stephenson-Carroll-
Whiteside-Rock Island-Henry IL-Bureau-Putnam-Mercer-Henderson-
Warren-Hancock-McDonough-Scotland-Clark-
1135 AM CDT Fri Jul 21 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
Missouri.

.DAY ONE...THIS AFTERNOON AND TONIGHT

Thunderstorms are expected to redevelop this afternoon and spread
east and south through the afternoon and evening. The environment
is conducive for severe weather with damaging winds, tornadoes,
flash flooding and large hail as the main threats. A few supercell
thunderstorms are possible before a bow echo develops this
evening. Some of these storms could be fast moving. Later tonight,
storms are expected to be slow moving and could cause flash
flooding.

The Rock and Pecatonica rivers are experiencing flooding. Please
see the latest Flood Statements and Flood Warnings for details.

Hot and humid weather will continue today, with afternoon heat
indices up to 110 degrees south of Highway 30. Excessive heat
warnings and heat advisories are in effect for most of the outlook
area.

.DAYS TWO THROUGH SEVEN...SATURDAY THROUGH THURSDAY

Additional rounds of thunderstorms are possible Saturday and
Sunday. Severe weather is possible, but confidence on timing and
favored locations remains low. If severe storms do occur, the main
threats would be damaging winds and flash flooding.

Hot and muggy conditions will continue Saturday, with afternoon
heat indices up to 110 degrees south of Highway 30.

.SPOTTER INFORMATION STATEMENT...

Spotter activation is likely this afternoon through the early
morning hours.

$$



Excessive Heat Warning

URGENT - WEATHER MESSAGE
National Weather Service Quad Cities IA IL
1056 AM CDT Fri Jul 21 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. There will be interrupted periods to the
excessive heat by thunderstorms and clouds.

IAZ063>065-067-068-076>078-087>089-098-099-ILZ015-016-024>026-034-
035-MOZ009-010-220000-
/O.CON.KDVN.EH.W.0001.000000T0000Z-170723T0100Z/
Iowa-Johnson-Cedar-Muscatine-Scott-Keokuk-Washington-Louisa-
Jefferson-Henry IA-Des Moines-Van Buren-Lee-Rock Island-Henry IL-
Mercer-Henderson-Warren-Hancock-McDonough-Scotland-Clark-
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
1056 AM CDT Fri Jul 21 2017

...EXCESSIVE HEAT WARNING REMAINS IN EFFECT UNTIL 8 PM CDT
SATURDAY...

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

* Timing...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
  minutes.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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.

&&

$$



U.S. Dept. of Commerce
NOAA National Weather Service
1325 East West Highway
Silver Spring, MD 20910
E-mail: w-nws.webmaster@noaa.gov
Page last modified: May 16, 2007
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