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2 products issued by NWS for: Deerfield IL
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Hazardous Weather Outlook

Hazardous Weather Outlook
National Weather Service Chicago/Romeoville IL
1257 PM CDT Thu Jun 24 2021

ILZ003>006-008-010>013-019>021-023-032-033-039-103>108-INZ001-002-
010-011-019-251800-
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-
1257 PM CDT Thu Jun 24 2021 /157 PM EDT Thu Jun 24 2021/

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...

  Significant Thunderstorm Risk...with an associated:
     Limited hail risk...up to penny size.
     Limited damaging wind risk...up to 60 mph.
  Limited Flooding Risk.

DISCUSSION...

Scattered thunderstorms are expected this afternoon across the
area, followed by more widespread thunderstorms after dark. A few
storms could approach severe limits. Heavy rainfall is likely with
storms. Totals of two to four inches are possible in some places by
Friday morning. This heavy rain may thus result in some localized
flooding.

.DAYS TWO THROUGH SEVEN...Friday through Wednesday.

Friday...
  Limited Severe Thunderstorm Risk.
  Significant Flooding Risk.
Saturday...
  Limited Severe Thunderstorm Risk.
  Elevated Flooding Risk.
  Limited Non Thunderstorm Wind Risk.
Sunday through Wednesday...
  Limited Thunderstorm Risk.

DISCUSSION:

Additional rounds of thunderstorms will affect the region Friday
into the weekend. A flooding risk may increase into Friday due to
cumulative rainfall, with some locations forecast to receive over
five inches of rain.

A period or two within that may support isolated strong to severe
thunderstorms as well.

.SPOTTER INFORMATION STATEMENT...

 Spotter activation is not anticipated today.

GENERAL STORM MOTION OF THE DAY:

  Moving toward the east northeast at 15 to 25 mph.

$$



Hydrologic Outlook

Hydrologic Outlook
ILC007-031-037-043-053-063-075-089-091-093-097-099-103-105-111-
141-197-201-INC007-073-089-111-127-242100-

Hydrologic Outlook
National Weather Service Chicago IL
359 AM CDT Thu Jun 24 2021 /459 AM EDT Thu Jun 24 2021/

...Periods of Heavy Rainfall Tonight through the Weekend with
Possible Flooding...

Multiple rounds of thunderstorms with heavy rainfall are expected
over the region through the weekend, primarily tonight through
Saturday. Despite dry weather and drought conditions across
portions of northern Illinois, river flooding and flash flooding
will be possible. Uncertainty is still high regarding the placement
of the highest rainfall totals and the extent of the flood threat.

Some locations are likely to experience over three inches of rain,
and may see more than five inches through Sunday. Drought
conditions will reduce the threat of flooding, however rainfall
rates in heavy thunderstorms can lead to flash flooding in dry soil
conditions, as well as in heavily urbanized or poor drainage
locations. If multiple waves of heavy rainfall were to occur in the
same locations, dry soil moisture conditions could be overcome and
river flooding may materialize. Confidence in the exact location of
the heaviest rainfall remains low at this time, and rainfall
amounts by next week may vary significantly across short distances.

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.

$$



U.S. Dept. of Commerce
NOAA National Weather Service
1325 East West Highway
Silver Spring, MD 20910
E-mail: w-nws.webmaster@noaa.gov
Page last modified: May 16, 2007
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