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Hazardous Weather Outlook

Hazardous Weather Outlook
National Weather Service Chicago/Romeoville IL
424 AM CDT Mon Sep 20 2021

ILZ003>006-008-010>013-019>021-023-032-033-039-103>108-INZ001-002-
010-011-019-210930-
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-
424 AM CDT Mon Sep 20 2021 /524 AM EDT Mon Sep 20 2021/

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

.DAY ONE...Today and Tonight.

Weather hazards expected...

  Elevated Thunderstorm Risk...with an associated:
     Limited damaging wind risk...up to 60 mph.
  Limited Flooding Risk.
  Limited Non Thunderstorm Wind Risk.

DISCUSSION...

Isolated thunderstorms are possible this morning into the
early to mid afternoon hours. No severe weather is expected
with these storms, though any storms that do occur could produce
torrential downpours.

A line of showers and scattered thunderstorms are expected to
move into north central Illinois, near the I-39 corridor, late
this evening. This line is expected to move across the remainder
of northern Illinois and into northwest Indiana overnight, likely
gradually weakening as it movs east. There is a low risk for strong
to possibly locally damaging winds with the most intense storms
tonight, particularly out toward and west of the I-39 corridor.

.DAYS TWO THROUGH SEVEN...Tuesday through Sunday.

Tuesday...
  Limited Flooding Risk.
  Limited Thunderstorm Risk.
  High Swim Risk.
Wednesday and Thursday...
  High Swim Risk.
Friday...
  Elevated Fire Weather Risk.

DISCUSSION:

Showers and some thunderstorms are expected to linger Tuesday
morning across far eastern Illinois and northwest Indiana. Some of
these storms could produce very heavy downpours.

A long duration of gusty onshore winds behind the front through
Thursday will cause a life threatening combination of large waves
and strong currents on southern Lake Michigan.

.SPOTTER INFORMATION STATEMENT...

  Spotters activation is not anticipated.

GENERAL STORM MOTION OF THE DAY:

  Moving toward the north northeast at 20 to 25 mph during the day,
  then toward the east at 25 to 30 mph tonight.

$$



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