Hazard Report Provided By forecast.weather.gov

SEVERE THUNDERSTORM WATCH OUTLINE UPDATE FOR WS 550
NWS STORM PREDICTION CENTER NORMAN OK
840 PM CDT SUN AUG 9 2026

SEVERE THUNDERSTORM WATCH 550 IS IN EFFECT UNTIL 400 AM CDT
FOR THE FOLLOWING LOCATIONS

ILC007-011-015-031-037-043-053-063-073-075-085-089-091-093-095-
097-099-103-105-111-113-123-131-141-143-155-161-175-177-179-195-
197-201-203-100900-
/O.NEW.KWNS.SV.A.0550.260810T0140Z-260810T0900Z/

IL
.    ILLINOIS COUNTIES INCLUDED ARE

BOONE                BUREAU              CARROLL
COOK                 DE KALB             DUPAGE
FORD                 GRUNDY              HENRY
IROQUOIS             JO DAVIESS          KANE
KANKAKEE             KENDALL             KNOX
LAKE                 LA SALLE            LEE
LIVINGSTON           MARSHALL            MCHENRY
MCLEAN               MERCER              OGLE
PEORIA               PUTNAM              ROCK ISLAND
STARK                STEPHENSON          TAZEWELL
WHITESIDE            WILL                WINNEBAGO
WOODFORD
$$

Flood Watch
National Weather Service Chicago IL
902 PM CDT Sun Aug 9 2026

ILZ005-006-011>013-020-021-023-103>108-INZ001-002-010-011-101200-
/O.CON.KLOT.FA.A.0011.000000T0000Z-260810T1200Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
McHenry-Lake IL-De Kalb-Kane-DuPage-Kendall-Grundy-Kankakee-
Northern Cook-Central Cook-Southern Cook-Northern Will-Southern
Will-Eastern Will-Lake IN-Porter-Newton-Jasper-
Including the cities of Wheaton, Mundelein, Des Plaines, Northbrook,
Hammond, Chicago, Elgin, DeKalb, Lombard, Crystal Lake, Oak Forest,
Orland Park, Roselawn, Carol Stream, Waukegan, Park Forest, McHenry,
Evanston, Oswego, Bourbonnais, Aurora, Kankakee, Crete, Yorkville,
Plainfield, Joliet, Kentland, Morocco, Portage, Cicero, Buffalo
Grove, Bradley, Schaumburg, DeMotte, Oak Lawn, Chesterton,
Bolingbrook, Palatine, Sycamore, Merrillville, Channahon, Mokena,
Minooka, Beecher, Plano, Gurnee, Calumet City, Lemont, Manhattan,
Coal City, Valparaiso, Rensselaer, La Grange, Gary, Peotone,
Woodstock, Downers Grove, Morris, Naperville, Wilmington, Algonquin,
and Oak Park
902 PM CDT Sun Aug 9 2026

...FLOOD WATCH REMAINS IN EFFECT UNTIL 7 AM CDT MONDAY...

* WHAT...Flash flooding caused by excessive rainfall continues to be
  possible.

* WHERE...Portions of Illinois, including the following areas,
  Central Cook, De Kalb, DuPage, Eastern Will, Grundy, Kane,
  Kankakee, Kendall, Lake IL, McHenry, Northern Cook, Northern Will,
  Southern Cook and Southern Will and northwest Indiana, including
  the following areas, Jasper, Lake IN, Newton and Porter.

* WHEN...Until 7 AM CDT Monday.

* IMPACTS...Creeks and streams may rise out of their banks. Flooding
  may occur in poor drainage and urban areas. Roads and streets may
  be flooded.

* ADDITIONAL DETAILS...
  - Showers and thunderstorms are developing along a stalled surface
    front. Atmospheric conditions are favorable for heavy rainfall
    with localized rainfall rates exceeding 2 inches per hour late
    this evening through the overnight. Slow storm motion and the
    potential for multiple rounds of rainfall will increase the
    threat for flooding in some areas. Portions of northeastern
    Illinois received 1 to 3 inches of rainfall earlier today which
    also increases the threat for additional flooding.
  - http://www.weather.gov/safety/flood

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Flood Watch for flash flooding means rapid-onset flooding is
possible, but not yet certain, based upon the latest forecasts. Flash
flooding is a dangerous situation. Persons with interests along area
rivers, creeks, and other waterways should monitor the latest
forecasts and be prepared to take action should flooding develop.

&&

$$

WSL

Hazardous Weather Outlook
National Weather Service Chicago/Romeoville IL
315 PM CDT Sun Aug 9 2026

ILZ003>006-008-010>013-019>021-023-032-033-039-103>108-INZ001-002-
010-011-019-102015-
Winnebago-Boone-McHenry-Lake IL-Ogle-Lee-De Kalb-Kane-DuPage-
La Salle-Kendall-Grundy-Kankakee-Livingston-Iroquois-Ford-
Northern Cook-Central Cook-Southern Cook-Northern Will-
Southern Will-Eastern Will-Lake IN-Porter-Newton-Jasper-Benton-
315 PM CDT Sun Aug 9 2026 /415 PM EDT Sun Aug 9 2026/

This Hazardous Weather Outlook is for portions of north central
Illinois...northeast Illinois and northwest Indiana.

.DAY ONE...This afternoon and Tonight.

Weather hazards expected...

  Elevated Thunderstorm Risk...with an associated:
     Level 2 of 5 Damaging Wind Risk...up to 60 mph.
     Level 2 of 5 Large Hail Risk...up to quarter size.
  Elevated Flooding Risk.

DISCUSSION...

Showers and thunderstorms will be most prevalent across the near
south suburbs of Chicago and into northwest Indiana. A few of
these storms may produce instances of penny to quarter size hail,
wind gusts to 60 mph, and very heavy rain especially along and
north of Interstate 80 close to the lake shore.

Additional thunderstorms may develop later this evening, with the
potential to produce additional localized severe weather as well
as locally heavy rainfall which could lead to instances of flash
flooding.

.DAYS TWO THROUGH SEVEN...Monday through Saturday.

Monday...
  Elevated Flooding Risk.
  Significant Thunderstorm Risk...with an associated:
     Level 2 of 5 Severe Thunderstorm Risk.
  Limited Excessive Heat Risk.
Tuesday...
  Elevated Flooding Risk.
  Limited Thunderstorm Risk...with an associated:
     Level 2 of 5 Severe Thunderstorm Risk.
  Limited Excessive Heat Risk.
Wednesday...
  Limited Flooding Risk.
  Limited Thunderstorm Risk.
Thursday...
  Elevated Flooding Risk.
  Limited Thunderstorm Risk.
Friday and Saturday...
  Limited Thunderstorm Risk.

DISCUSSION...

Additional rounds of showers and thunderstorms are likely across
the region Monday through at least Wednesday, with a continued
threat of flash flooding and severe weather at times, especially
Monday into Tuesday.

.SPOTTER INFORMATION STATEMENT...

  Spotters may be needed this afternoon.

GENERAL STORM MOTION OF THE DAY:

  Moving toward the east southeast at 40 to 45 mph.

$$

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