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3 products issued by NWS for: Ottawa IL
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Hazardous Weather Outlook

Hazardous Weather Outlook
National Weather Service Chicago/Romeoville IL
357 PM CST Wed Jan 23 2019

ILZ003>006-008-010>014-019>023-032-033-039-INZ001-002-010-011-019-
242200-
Winnebago-Boone-McHenry-Lake IL-Ogle-Lee-DeKalb-Kane-DuPage-Cook-
La Salle-Kendall-Grundy-Will-Kankakee-Livingston-Iroquois-Ford-
Lake IN-Porter-Newton-Jasper-Benton-
357 PM CST Wed Jan 23 2019 /457 PM EST Wed Jan 23 2019/

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

.DAY ONE...Tonight.

Weather hazards expected...

  Limited Excessive cold Risk.

DISCUSSION...

Wind chill values could be as cold as 5 to 10 below zero in
portions of northern Illinois late tonight.

.DAYS TWO THROUGH SEVEN...Thursday through Tuesday.

Thursday...
  Significant Excessive Cold Risk at night.
Friday...
  Significant Excessive Cold Risk in the morning.
  Limited Snow Risk in the afternoon and evening.
Saturday...
  Limited Excessive Cold Risk.
Sunday through Monday...
  Limited Excessive Cold Risk.
  Elevated Snow Risk Sunday night through Monday.
Tuesday...
  Significant Excessive Cold Risk at night.

In addition, with the extended duration of very cold temperatures
expected, there is an increasing risk for ice jams on area rivers.

DISCUSSION:

A strong Arctic front passage on Thursday will result in wind
chills of 20 to 35 below zero late Thursday night through Friday
morning. Areas of blowing snow are possible in portions of
northern Illinois Thursday afternoon and evening.

Light snow accumulations are possible Friday afternoon and evening
along with continued very cold temperatures.

Potentially significant snow accumulations are possible Sunday
night through Monday. This will be followed by another shot of
bitterly cold temperatures and potentially dangerously cold wind
chills mid next week.

.SPOTTER INFORMATION STATEMENT...

  Spotter activation will not be necessary through tonight.

$$



Wind Chill Watch

URGENT - WINTER WEATHER MESSAGE
National Weather Service Chicago IL
300 PM CST Wed Jan 23 2019

...Dangerously Cold Wind Chills Possible Thursday night into
Friday Morning...

ILZ003>006-008-010>012-019-020-240500-
/O.CON.KLOT.WC.A.0001.190125T0000Z-190125T1800Z/
Winnebago-Boone-McHenry-Lake IL-Ogle-Lee-DeKalb-Kane-La Salle-
Kendall-
Including the cities of Rockford, Belvidere, Woodstock, Waukegan,
Oregon, Dixon, DeKalb, Aurora, Elgin, Ottawa, and Oswego
300 PM CST Wed Jan 23 2019

...WIND CHILL WATCH REMAINS IN EFFECT FROM THURSDAY EVENING
THROUGH FRIDAY MORNING...

* WHAT...Dangerously cold wind chills possible. Wind chills as
  low as 30 below zero possible.

* WHERE...Portions of north central and northeast Illinois.

* WHEN...From Thursday evening through Friday morning.

* ADDITIONAL DETAILS...The cold wind chills could cause
  frostbite on exposed skin in as little as 30 minutes.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Wind Chill Watch means there is the potential for a combination
of very cold air and the wind to create dangerously low wind
chill values. Monitor the latest forecasts and warnings for
updates on this situation.

&&

$$



Hydrologic Outlook

Hydrologic Outlook
ILC007-031-037-043-063-089-091-093-097-099-103-105-111-141-197-
201-INC073-089-111-127-241600-

Hydrologic Outlook
National Weather Service Chicago IL
1053 AM CST Wed Jan 23 2019

...Risk for river ice and ice jams increasing next several days...

Favorable conditions for river ice formation and possible ice jams
developing for the following rivers and their tributaries...

Rock, Fox, DuPage, Des Plaines, Iroquois, and Kankakee in
northern Illinois, and Iroquois, and Kankakee in northwest
Indiana.

...through at least early next week.

Due to recent cold weather and additional very cold temperatures
expected over the next several days, conditions are favorable for
river ice formation. River ice has caused at least one ice jam
in northern Illinois over the last few days. Rapid development of
river ice may lead to additional ice jams, causing rises on area
rivers with little warning.

This outlook means that elevated river conditions and potential
impacts are possible, but not yet certain. Those with interests
along area rivers should closely monitor future river forecasts.

$$

WSL



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