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Hazardous Weather Outlook

Hazardous Weather Outlook
National Weather Service Chicago/Romeoville IL
408 PM CDT Fri Oct 22 2021

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-
408 PM CDT Fri Oct 22 2021 /508 PM EDT Fri Oct 22 2021/

This Hazardous Weather Outlook is for portions of North Central
Illinois...Northeast Illinois and Northwest Indiana.

.DAY ONE...Tonight.

Weather hazards expected...

  Elevated Frost Risk.


Areas of frost to widespread frost development is anticipated
late tonight near and northwest of the I-55 corridor outside of
Chicago. Near freezing temperatures are forecast near and west of
the Fox River Valley. Elsewhere, patchy frost is possible away
from the lakefront.

.DAYS TWO THROUGH SEVEN...Saturday through Thursday.

Saturday Morning...
  Elevated Frost Risk.
  Limited Thunderstorm Risk.
  Limited Flooding Risk.
  Limited Non Thunderstorm Wind Risk, especially near Illinois shore.
  Elevated Lakeshore Flood Risk at night, especially Illinois shore.
  Limited Non Thunderstorm Wind Risk, especially near the lake.
  Elevated Lakeshore Flood Risk, especially Illinois shore.


Widespread, soaking rain and blustery winds are becoming
increasingly likely Sunday and Monday. Rises in river and stream
levels will occur, and flooding may occur on roadways near leaf-
clogged sewer drains. Additionally, flooding of parks and trails
immediately along the Lake Michigan shore may occur, particularly
in Illinois. Finally, a few strong thunderstorms may be possible
south of US-24 Sunday evening.


  Spotter activation will not be necessary through tonight.


Hydrologic Outlook

Hydrologic Outlook

Hydrologic Outlook
National Weather Service Chicago IL
353 PM CDT Fri Oct 22 2021 /453 PM EDT Fri Oct 22 2021/

...Heavy Rainfall Potential Sunday into Monday...

A wet weather pattern is expected to begin across much of the area
early Sunday with waves of steady and occasionally heavy rainfall.
Despite previous dry weather conditions across portions of northern
Illinois, minor flooding is possible in areas that receive the
heaviest rainfall. Confidence in the exact location of the
highest totals and the extent of any flood threat remains low at
this time.

Current forecasts indicate 1.5 to 3 inches of rainfall across the
area through Monday morning, with the heaviest expected near and
south of I-80. Although drought conditions will reduce the threat
of flooding especially in far northern Illinois, the extended
period of wet weather may still result in minor flooding in
isolated areas.

This outlook means that there is the potential for elevated river
levels and flooding impacts, but the timing, extent, and severity
remain uncertain. Persons with interests along area rivers should
closely monitor the latest forecasts.



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