566 
WGUS83 KLOT 200516
FLSLOT

Flood Advisory
National Weather Service Chicago IL
1216 AM CDT Sun Sep 20 2026

ILC037-099-103-200815-
/O.NEW.KLOT.FA.Y.0121.260920T0516Z-260920T0815Z/
/00000.N.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
De Kalb IL-La Salle IL-Lee IL-
1216 AM CDT Sun Sep 20 2026

...FLOOD ADVISORY IN EFFECT UNTIL 315 AM CDT EARLY THIS MORNING...

* WHAT...Flooding caused by excessive rainfall is expected.

* WHERE...Southern De Kalb County in north central Illinois...
  Northern La Salle County in north central Illinois...
  Lee County in north central Illinois...

* WHEN...Until 315 AM CDT.

* IMPACTS...Creeks and streams may rise out of their banks. Roads and
  streets may be flooded.

* ADDITIONAL DETAILS...
  - At 1213 AM CDT, Doppler radar indicated heavy rain due to
    training thunderstorms. Minor flooding is ongoing or expected to
    begin shortly in the advisory area. Up to 2 inches of rain have
    fallen.
  - Additional rainfall amounts in excess of 1 to 3 inches are
    possible over the area overnight which may result in additional
    flooding.
  - Some locations that will experience flooding include...
    Sandwich, Mendota, Amboy, Sheridan, Shabbona, Lake Holiday,
    Hinckley, Somonauk, Earlville, Waterman, Serena, Leland, Paw Paw,
    Sublette, Woodhaven Lakes, Millington, Lee, Compton, Troy Grove,
    Nelson, West Brooklyn, Harmon, Triumph, Prairie Center and Lee
    Center.
  - http://www.weather.gov/safety/flood

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Flood Advisory means minor flooding along waterways and other poor
drainage areas is imminent or may already be occurring. Persons in
the advisory area should use caution and avoid flood waters.

Be especially cautious at night when it is harder to recognize the
dangers of flooding.

&&

LAT...LON 4180 8963 4179 8860 4145 8860 4145 8917
      4158 8917 4158 8939 4159 8963


$$

Petr

816 
WGUS83 KLOT 200712
FLSLOT

Flood Advisory
National Weather Service Chicago IL
212 AM CDT Sun Sep 20 2026

ILC037-099-103-200722-
/O.CAN.KLOT.FA.Y.0121.000000T0000Z-260920T0815Z/
/00000.N.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
De Kalb IL-La Salle IL-Lee IL-
212 AM CDT Sun Sep 20 2026

...FLOOD ADVISORY HAS BEEN REPLACED WITH A FLASH FLOOD WARNING...

The Flood Advisory is replaced by a Flash Flood Warning for a portion
of north central Illinois, including the following areas, De Kalb, La
Salle and Lee.

The threat for widespread flooding has increased over the area.
Therefore the Flood Advisory has been replaced by a Flood Warning.
Please refer to that bulletin for more information.

&&

LAT...LON 4180 8963 4179 8860 4145 8860 4145 8917
      4158 8917 4158 8939 4159 8963


$$

Petr