Hazard Report Provided By forecast.weather.gov

Hazardous Weather Outlook
National Weather Service Quad Cities IA IL
309 PM CDT Sat Jul 18 2026

IAZ040>042-051>054-063>068-076>078-087>089-098-099-ILZ001-002-007-
009-015>018-024>026-034-035-MOZ009-010-192015-
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-
309 PM CDT Sat Jul 18 2026

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

A heat advisory is in effect for most areas south of Interstate
80 in Iowa, and from near the Quad Cities metro area southward in
Illinois, where heat indices of 100 to 105 are possible.

Isolated to scattered thunderstorms are expected through late this
evening, mainly south of Interstate 80. There is a marginal,
level 1 out of 5, risk of severe storms. The primary threats will
be locally damaging winds, lightning, and heavy downpours. A
level 2, slight risk is forecast in portions of central Illinois,
including portions of Bureau and Putnam counties.

.DAYS TWO THROUGH SEVEN...SUNDAY THROUGH FRIDAY

Hot and humid conditions will return again on Monday and a heat
advisory may be needed for portions of the outlook area.

Thunderstorms will be possible on Monday, with the main severe
risk later Monday afternoon into Monday night. There is an
Enhanced Risk (level 3 of 5) for severe storms northwest of the
Quad Cities and a Slight Risk (level 2 of 5) to the east and
south.

.SPOTTER INFORMATION STATEMENT...

Spotter activation may be needed through this evening.

$$

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ILZ001-002-007-009-015>018-024>026-034-035-191800-
Jo Daviess-Stephenson-Carroll-Whiteside-Rock Island-Henry IL-Bureau-
Putnam-Mercer-Henderson-Warren-Hancock-McDonough-
Including the cities of Galena, Freeport, Mount Carroll, Sterling,
Moline, Rock Island, Geneseo, Princeton, Hennepin, Aledo, Oquawka,
Monmouth, Carthage, and Macomb
1247 PM CDT Sat Jul 18 2026

...AIR QUALITY ALERT IN EFFECT FROM MIDNIGHT TONIGHT TO MIDNIGHT CDT
SUNDAY NIGHT...

The Illinois Environmental Protection Agency has issued an Areawide
Air Pollution Action Day for Sunday July 19th for portions of
Illinois.

An Areawide Air Pollution Action Day is declared when weather conditions
are such that widespread ozone and or particulate levels are forecast
to be at OR ABOVE the Unhealthy for Sensitive Groups (USG) category in
all or nearly all Illinois AQI forecast sectors.

Areas both inside and outside of the Action Day coverage area may
experience smoke/PM2.5 to a varying degree and duration both later
today and Sunday. Those with air quality concerns or anyone in
Illinois with outdoor plans is encouraged to check current NowCast
readings or sign up for EnviroFlash alerts on AirNow.gov. Before
going outside, checking the NowCast AQI will help identify periods of
both poor and cleaner air quality regardless of the level of the
daily forecasted AQI.

AQI Category Guidance

Unhealthy for Sensitive Groups (USG) - Members of sensitive groups
may experience health effects. The general public is less likely to
be affected.

Sensitive groups: Make outdoor activities shorter and less intense.
Its OK to be active outdoors, but take more breaks. Watch for
symptoms such as coughing or shortness of breath. People with asthma:
Follow your asthma action plan and keep quick relief medicine handy.
People with heart disease: Symptoms such as palpitations, shortness
of breath, or unusual fatigue may indicate a serious problem. If you
have any of these, contact your health care provider.

Unhealthy - Sensitive groups: Avoid long or intense outdoor
activities. Consider rescheduling or moving activities indoors.

Everyone else: Reduce long or intense activities. Take more breaks
during outdoor activities.

Air quality forecasts and current air quality can be found at
www.airnow.gov

Media Contact... Illinois EPA

$$

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Hazard Report Provided By forecast.weather.gov