Wind Advisory 13, NWS Chicago, IL

Boone County, IL, Cook County, IL, DeKalb County, IL, DuPage County, IL, Ford County, IL, Grundy County, IL, Iroquois County, IL, Kane County, IL, Kankakee County, IL, Kendall County, IL, Lake County, IL, LaSalle County, IL, Lee County, IL, Livingston County, IL, McHenry County, IL, Ogle County, IL, Will County, IL, Winnebago County, IL, Benton County, IN, Jasper County, IN, Lake County, IN, Newton County, IN, Porter County, IN

842 
WWUS73 KLOT 280323
NPWLOT

URGENT - WEATHER MESSAGE
National Weather Service Chicago IL
923 PM CST Sat Dec 27 2025

ILZ003>006-008-010>013-019>021-023-032-033-039-103>108-INZ001-002-
010-011-019-281330-
/O.CON.KLOT.WI.Y.0013.251229T0000Z-251230T0000Z/
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-
Including the cities of Oak Forest, Fairbury, Mendota,
Northbrook, Kankakee, Oak Park, Ottawa, Rochelle, Kentland,
Belvidere, Marseilles, McHenry, Beecher, Bourbonnais, Oak Lawn,
Oxford, Bolingbrook, Schaumburg, Carol Stream, Morocco, Buffalo
Grove, Peotone, Aurora, Yorkville, Wilmington, Palatine, Gurnee,
Paxton, Waukegan, Crete, Minooka, Park Forest, Woodstock, Downers
Grove, Calumet City, Crystal Lake, Plainfield, DeMotte, Gary,
Watseka, La Salle, Wheaton, Dwight, Hammond, Streator, Oswego,
Plano, Naperville, Coal City, Orland Park, Manhattan, Rockford,
Algonquin, Sycamore, Gibson City, Evanston, Chesterton, Bradley,
Morris, DeKalb, Mundelein, Oregon, Fowler, Valparaiso, Byron,
Lombard, Merrillville, La Grange, Roselawn, Joliet, Chicago,
Gilman, Portage, Lemont, Dixon, Cicero, Des Plaines, Elgin,
Pontiac, Channahon, Rensselaer, and Mokena
923 PM CST Sat Dec 27 2025 /1023 PM EST Sat Dec 27 2025/

...WIND ADVISORY REMAINS IN EFFECT FROM 6 PM CST /7 PM EST/ SUNDAY 
TO 6 PM CST /7 PM EST/ MONDAY...

* WHAT...West winds 25 to 35 mph with gusts up to 50 mph expected. A 
  few gusts to 55 mph possible.

* WHERE...Portions of central, east central, north central, and 
  northeast Illinois and northwest Indiana.

* WHEN...From 6 PM CST /7 PM EST/ Sunday to 6 PM CST /7 PM EST/ 
  Monday.

* IMPACTS...Gusty winds will blow around unsecured objects. Tree 
  limbs could be blown down and a few power outages may result. 
  Winds this strong can make driving difficult, especially for high 
  profile vehicles on north to south roads through open and exposed 
  areas.

* ADDITIONAL DETAILS...Wind-whipped snow showers Sunday night 
  through Monday morning may result in locally hazardous travel 
  conditions.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Use extra caution when driving, especially in a high profile vehicle.

Secure outdoor objects, including holiday decorations.

&&

$$

RC

707 
WWUS73 KLOT 280844
NPWLOT

URGENT - WEATHER MESSAGE
National Weather Service Chicago IL
244 AM CST Sun Dec 28 2025

ILZ003>006-008-010>013-019>021-023-032-033-039-103>108-INZ001-010-
011-019-281845-
/O.EXT.KLOT.WI.Y.0013.251229T0000Z-251229T2100Z/
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-Newton-Jasper-Benton-
Including the cities of Fowler, Aurora, La Salle, Merrillville,
Byron, Naperville, Yorkville, Streator, Oxford, Rensselaer,
Hammond, Sycamore, Watseka, Carol Stream, DeMotte, Cicero,
Fairbury, Gilman, Schaumburg, Mendota, Joliet, Belvidere, Gibson
City, Wheaton, Calumet City, Pontiac, Rockford, DeKalb, Oak Park,
Peotone, Wilmington, Crystal Lake, Morris, Morocco, Kentland,
Woodstock, Bourbonnais, Chicago, Park Forest, La Grange,
Mundelein, Algonquin, Kankakee, Bolingbrook, Channahon, Crete,
Downers Grove, Dixon, Oak Lawn, McHenry, Dwight, Des Plaines,
Coal City, Plainfield, Oswego, Waukegan, Plano, Roselawn, Lemont,
Rochelle, Paxton, Orland Park, Beecher, Evanston, Gary,
Marseilles, Mokena, Bradley, Palatine, Buffalo Grove, Manhattan,
Oak Forest, Oregon, Lombard, Elgin, Gurnee, Ottawa, Minooka, and
Northbrook
244 AM CST Sun Dec 28 2025 /344 AM EST Sun Dec 28 2025/

...WIND ADVISORY NOW IN EFFECT FROM 6 PM CST THIS EVENING TO 3 PM 
CST MONDAY...

* WHAT...West winds 25 to 35 mph with gusts of 45 to 55 mph expected.

* WHERE...Portions of central, east central, north central, and 
  northeast Illinois and northwest Indiana.

* WHEN...From 6 PM CST this evening to 3 PM CST Monday.

* IMPACTS...Gusty winds will blow around unsecured objects. Tree 
  limbs could be blown down and a few power outages may result.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Winds this strong can make driving difficult, especially for high 
profile vehicles. Use extra caution.

Secure outdoor objects.

&&

$$

INZ002-281845-
/O.EXT.KLOT.WI.Y.0013.251229T0000Z-251229T2100Z/
Porter-
Including the cities of Portage, Chesterton, and Valparaiso
244 AM CST Sun Dec 28 2025

...WIND ADVISORY NOW IN EFFECT FROM 6 PM THIS EVENING TO 3 PM CST 
MONDAY...

* WHAT...West winds 25 to 35 mph with gusts of 45 to 55 mph 
  expected, except 30 to 45 mph with gusts of 50 to 65 mph expected 
  near Lake Michigan.

* WHERE...Porter County.

* WHEN...From 6 PM this evening to 3 PM CST Monday.

* IMPACTS...Gusty winds will blow around unsecured objects. Tree 
  limbs could be blown down and a few power outages may result. Near 
  Lake Michigan winds could down large branches, result in power 
  outages, and make driving of high profile vehicles dangerous on 
  move north south oriented roads.

* ADDITIONAL DETAILS...This wind advisory will likely be upgraded to 
  a high wind warning today due to the expectation of damaging winds 
  occurring near Lake Michigan tonight into Monday morning 
  especially.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Winds this strong can make driving difficult, especially for high 
profile vehicles. Use extra caution.

&&

$$

- Izzi

847 
WWUS73 KLOT 280909
NPWLOT

URGENT - WEATHER MESSAGE
National Weather Service Chicago IL
309 AM CST Sun Dec 28 2025

ILZ003>006-008-010>013-020-103>106-281915-
/O.NEW.KLOT.FG.Y.0019.251228T0909Z-251228T1200Z/
/O.CON.KLOT.WI.Y.0013.251229T0000Z-251229T2100Z/
Winnebago-Boone-McHenry-Lake IL-Ogle-Lee-De Kalb-Kane-DuPage-
Kendall-Northern Cook-Central Cook-Southern Cook-Northern Will-
Including the cities of Northbrook, McHenry, Sycamore, Oregon,
Woodstock, Chicago, Palatine, La Grange, Bolingbrook, Byron,
Mundelein, Wheaton, Lemont, Lombard, Dixon, Orland Park,
Naperville, Schaumburg, Carol Stream, Buffalo Grove, DeKalb,
Rockford, Oak Forest, Yorkville, Belvidere, Park Forest, Mokena,
Oswego, Algonquin, Aurora, Cicero, Joliet, Des Plaines, Elgin,
Crystal Lake, Waukegan, Evanston, Gurnee, Calumet City, Oak Park,
Plano, Downers Grove, Plainfield, Rochelle, and Oak Lawn
309 AM CST Sun Dec 28 2025

...DENSE FOG ADVISORY IN EFFECT UNTIL 6 AM CST EARLY THIS MORNING...
...WIND ADVISORY REMAINS IN EFFECT FROM 6 PM THIS EVENING TO 3 PM 
CST MONDAY...

* WHAT...Areas of dense fog will reduce visibilities down to a 
  quarter mile or less. West winds 25 to 35 mph with gusts of 45 to 
  55 mph expected.

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

* WHEN...For the Dense Fog Advisory, until 6 AM CST early this 
  morning. For the Wind Advisory, from 6 PM this evening to 3 PM CST 
  Monday.

* IMPACTS...Low visibility could make driving conditions hazardous. 
  Gusty winds will blow around unsecured objects. Tree limbs could 
  be blown down and a few power outages may result.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Use low beam headlights and slow down allowing additional room 
between vehicles.

Winds this strong can make driving difficult, especially for high 
profile vehicles. Use extra caution.

Secure outdoor objects.

If driving, slow down, use your headlights, and leave plenty of 
distance ahead of you.

&&

$$

ILZ019-021-023-032-033-039-107-108-INZ001-010-011-019-281915-
/O.CON.KLOT.WI.Y.0013.251229T0000Z-251229T2100Z/
La Salle-Grundy-Kankakee-Livingston-Iroquois-Ford-Southern Will-
Eastern Will-Lake IN-Newton-Jasper-Benton-
Including the cities of Bradley, Mendota, Morris, Marseilles,
Bourbonnais, Coal City, Pontiac, Kentland, Gibson City, DeMotte,
Minooka, Wilmington, Merrillville, Paxton, Streator, Channahon,
Watseka, Gilman, Gary, Fowler, Beecher, Rensselaer, Kankakee,
Manhattan, Ottawa, Oxford, Dwight, Hammond, Peotone, La Salle,
Fairbury, Crete, Morocco, and Roselawn
309 AM CST Sun Dec 28 2025 /409 AM EST Sun Dec 28 2025/

...WIND ADVISORY REMAINS IN EFFECT FROM 6 PM CST /7 PM EST/ THIS 
EVENING TO 3 PM CST /4 PM EST/ MONDAY...

* WHAT...West winds 25 to 35 mph with gusts up to 50 mph expected.

* WHERE...In Illinois, Livingston, Ford, Iroquois, La Salle, Eastern 
  Will, Grundy, Kankakee, and Southern Will Counties. In Indiana, 
  Benton, Jasper, Lake IN, and Newton Counties.

* WHEN...From 6 PM CST /7 PM EST/ this evening to 3 PM CST /4 PM 
  EST/ Monday.

* IMPACTS...Gusty winds will blow around unsecured objects. Tree 
  limbs could be blown down and a few power outages may result. 
  Winds this strong can make driving difficult, especially for high 
  profile vehicles on north to south roads through open and exposed 
  areas.

* ADDITIONAL DETAILS...Wind-whipped snow showers Sunday night 
  through Monday morning may result in locally hazardous travel 
  conditions.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Use extra caution when driving, especially in a high profile vehicle.

Secure outdoor objects, including holiday decorations.

&&

$$

INZ002-281915-
/O.CON.KLOT.WI.Y.0013.251229T0000Z-251229T2100Z/
Porter-
Including the cities of Valparaiso, Chesterton, and Portage
309 AM CST Sun Dec 28 2025

...WIND ADVISORY REMAINS IN EFFECT FROM 6 PM THIS EVENING TO 3 PM 
CST MONDAY...

* WHAT...West winds 25 to 35 mph with gusts of 45 to 55 mph 
  expected, except 30 to 45 mph with gusts of 50 to 65 mph expected 
  near Lake Michigan.

* WHERE...Porter County.

* WHEN...From 6 PM this evening to 3 PM CST Monday.

* IMPACTS...Gusty winds will blow around unsecured objects. Tree 
  limbs could be blown down and a few power outages may result. Near 
  Lake Michigan winds could down large branches, result in power 
  outages, and make driving of high profile vehicles dangerous on 
  move north south oriented roads.

* ADDITIONAL DETAILS...This wind advisory will likely be upgraded to 
  a high wind warning today due to the expectation of damaging winds 
  occurring near Lake Michigan tonight into Monday morning 
  especially.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Winds this strong can make driving difficult, especially for high 
profile vehicles. Use extra caution.

&&

$$

DK/Izzi

553 
WWUS73 KLOT 281154
NPWLOT

URGENT - WEATHER MESSAGE
National Weather Service Chicago IL
554 AM CST Sun Dec 28 2025

ILZ104>106-282200-
/O.EXP.KLOT.FG.Y.0019.000000T0000Z-251228T1200Z/
/O.CON.KLOT.WI.Y.0013.251229T0000Z-251229T2100Z/
Central Cook-Southern Cook-Northern Will-
Including the cities of Oak Forest, Chicago, Orland Park, Joliet,
Park Forest, Calumet City, Mokena, Oak Park, La Grange,
Bolingbrook, Plainfield, Cicero, Lemont, and Oak Lawn
554 AM CST Sun Dec 28 2025

...WIND ADVISORY REMAINS IN EFFECT FROM 6 PM THIS EVENING TO 3 PM 
CST MONDAY...
...DENSE FOG ADVISORY WILL EXPIRE AT 6 AM CST EARLY THIS MORNING...

* WHAT...West winds 25 to 35 mph with gusts up to 50 mph expected.

* WHERE...Central Cook, Northern Will, and Southern Cook Counties.

* WHEN...From 6 PM this evening to 3 PM CST Monday.

* IMPACTS...Gusty winds will blow around unsecured objects. Tree 
  limbs could be blown down and a few power outages may result.

* ADDITIONAL DETAILS...Wind-whipped snow showers Sunday night 
  through Monday morning may result in locally hazardous travel 
  conditions.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Winds this strong can make driving difficult, especially for high 
profile vehicles. Use extra caution.

Secure outdoor objects.

&&

$$

ILZ003>006-008-010>013-020-103-282200-
/O.EXT.KLOT.FG.Y.0019.000000T0000Z-251228T1500Z/
/O.CON.KLOT.WI.Y.0013.251229T0000Z-251229T2100Z/
Winnebago-Boone-McHenry-Lake IL-Ogle-Lee-De Kalb-Kane-DuPage-
Kendall-Northern Cook-
Including the cities of Northbrook, McHenry, Sycamore, Oregon,
Woodstock, Palatine, Byron, Mundelein, Wheaton, Lombard, Dixon,
Naperville, Schaumburg, Carol Stream, Buffalo Grove, DeKalb,
Rockford, Yorkville, Belvidere, Oswego, Algonquin, Aurora, Des
Plaines, Elgin, Crystal Lake, Waukegan, Evanston, Gurnee, Plano,
Downers Grove, and Rochelle
554 AM CST Sun Dec 28 2025

...DENSE FOG ADVISORY NOW IN EFFECT UNTIL 9 AM CST THIS MORNING...
...WIND ADVISORY REMAINS IN EFFECT FROM 6 PM THIS EVENING TO 3 PM 
CST MONDAY...

* WHAT...For the Dense Fog Advisory, visibility one quarter mile or 
  less in dense fog. For the Wind Advisory, west winds 25 to 35 mph 
  with gusts up to 50 mph expected.

* WHERE...Boone, De Kalb, Lee, Ogle, Winnebago, DuPage, Kane, 
  Kendall, Lake IL, McHenry, and Northern Cook Counties.

* WHEN...For the Dense Fog Advisory, until 9 AM CST this morning. 
  For the Wind Advisory, from 6 PM this evening to 3 PM CST Monday.

* IMPACTS...Gusty winds will blow around unsecured objects. Tree 
  limbs could be blown down and a few power outages may result. Low 
  visibility could make driving conditions hazardous.

* ADDITIONAL DETAILS...Wind-whipped snow showers Sunday night 
  through Monday morning may result in locally hazardous travel 
  conditions.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Winds this strong can make driving difficult, especially for high 
profile vehicles. Use extra caution.

Secure outdoor objects.

If driving, slow down, use your headlights, and leave plenty of 
distance ahead of you.

&&

$$

ILZ019-021-023-032-033-039-107-108-INZ001-010-011-019-282200-
/O.CON.KLOT.WI.Y.0013.251229T0000Z-251229T2100Z/
La Salle-Grundy-Kankakee-Livingston-Iroquois-Ford-Southern Will-
Eastern Will-Lake IN-Newton-Jasper-Benton-
Including the cities of Bradley, Mendota, Morris, Marseilles,
Bourbonnais, Coal City, Pontiac, Kentland, Gibson City, DeMotte,
Minooka, Wilmington, Merrillville, Paxton, Streator, Channahon,
Watseka, Gilman, Gary, Fowler, Beecher, Rensselaer, Kankakee,
Manhattan, Ottawa, Oxford, Dwight, Hammond, Peotone, La Salle,
Fairbury, Crete, Morocco, and Roselawn
554 AM CST Sun Dec 28 2025 /654 AM EST Sun Dec 28 2025/

...WIND ADVISORY REMAINS IN EFFECT FROM 6 PM CST /7 PM EST/ THIS 
EVENING TO 3 PM CST /4 PM EST/ MONDAY...

* WHAT...West winds 25 to 35 mph with gusts up to 50 mph expected.

* WHERE...In Illinois, Livingston, Ford, Iroquois, La Salle, Eastern 
  Will, Grundy, Kankakee, and Southern Will Counties. In Indiana, 
  Benton, Jasper, Lake IN, and Newton Counties.

* WHEN...From 6 PM CST /7 PM EST/ this evening to 3 PM CST /4 PM 
  EST/ Monday.

* IMPACTS...Gusty winds will blow around unsecured objects. Tree 
  limbs could be blown down and a few power outages may result. 
  Winds this strong can make driving difficult, especially for high 
  profile vehicles on north to south roads through open and exposed 
  areas.

* ADDITIONAL DETAILS...Wind-whipped snow showers Sunday night 
  through Monday morning may result in locally hazardous travel 
  conditions.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Use extra caution when driving, especially in a high profile vehicle.

Secure outdoor objects, including holiday decorations.

&&

$$

INZ002-282200-
/O.CON.KLOT.WI.Y.0013.251229T0000Z-251229T2100Z/
Porter-
Including the cities of Valparaiso, Chesterton, and Portage
554 AM CST Sun Dec 28 2025

...WIND ADVISORY REMAINS IN EFFECT FROM 6 PM THIS EVENING TO 3 PM 
CST MONDAY...

* WHAT...West winds 25 to 35 mph with gusts of 45 to 55 mph 
  expected, except 30 to 45 mph with gusts of 50 to 65 mph expected 
  near Lake Michigan.

* WHERE...Porter County.

* WHEN...From 6 PM this evening to 3 PM CST Monday.

* IMPACTS...Gusty winds will blow around unsecured objects. Tree 
  limbs could be blown down and a few power outages may result. Near 
  Lake Michigan winds could down large branches, result in power 
  outages, and make driving of high profile vehicles dangerous on 
  move north south oriented roads.

* ADDITIONAL DETAILS...This wind advisory will likely be upgraded to 
  a high wind warning today due to the expectation of damaging winds 
  occurring near Lake Michigan tonight into Monday morning 
  especially.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Winds this strong can make driving difficult, especially for high 
profile vehicles. Use extra caution.

&&

$$

DK/Izzi

592 
WWUS73 KLOT 281455
NPWLOT

URGENT - WEATHER MESSAGE
National Weather Service Chicago IL
855 AM CST Sun Dec 28 2025

ILZ003>006-008-010>013-020-103-290100-
/O.EXP.KLOT.FG.Y.0019.000000T0000Z-251228T1500Z/
/O.CON.KLOT.WI.Y.0013.251229T0000Z-251229T2100Z/
Winnebago-Boone-McHenry-Lake IL-Ogle-Lee-De Kalb-Kane-DuPage-
Kendall-Northern Cook-
Including the cities of Oregon, Wheaton, Rochelle, Elgin,
Rockford, Gurnee, Woodstock, Des Plaines, Plano, Mundelein,
Northbrook, Lombard, Schaumburg, Belvidere, Naperville, McHenry,
Dixon, Carol Stream, Sycamore, Byron, Oswego, Waukegan, DeKalb,
Aurora, Yorkville, Palatine, Evanston, Buffalo Grove, Crystal
Lake, Downers Grove, and Algonquin
855 AM CST Sun Dec 28 2025

...WIND ADVISORY REMAINS IN EFFECT FROM 6 PM THIS EVENING TO 3 PM 
CST MONDAY...
...DENSE FOG ADVISORY WILL EXPIRE AT 9 AM CST THIS MORNING...

* WHAT...West winds 25 to 35 mph with gusts up to 50 mph expected.

* WHERE...Boone, De Kalb, Lee, Ogle, Winnebago, DuPage, Kane, 
  Kendall, Lake IL, McHenry, and Northern Cook Counties.

* WHEN...From 6 PM this evening to 3 PM CST Monday.

* IMPACTS...Gusty winds will blow around unsecured objects. Tree 
  limbs could be blown down and a few power outages may result.

* ADDITIONAL DETAILS...Wind-whipped snow showers Sunday night 
  through Monday morning may result in locally hazardous travel 
  conditions.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Winds this strong can make driving difficult, especially for high 
profile vehicles. Use extra caution.

Secure outdoor objects, including holiday decorations.

&&

$$

ILZ019-021-023-032-033-039-104>108-INZ001-010-011-019-290100-
/O.CON.KLOT.WI.Y.0013.251229T0000Z-251229T2100Z/
La Salle-Grundy-Kankakee-Livingston-Iroquois-Ford-Central Cook-
Southern Cook-Northern Will-Southern Will-Eastern Will-Lake IN-
Newton-Jasper-Benton-
Including the cities of La Salle, Chicago, Coal City,
Bolingbrook, Watseka, Morris, Beecher, Kankakee, Joliet, Oak
Forest, Fowler, Morocco, Lemont, Ottawa, Oak Park, Calumet City,
Bourbonnais, Manhattan, Rensselaer, Cicero, Crete, Wilmington,
Oak Lawn, Paxton, Park Forest, Gibson City, Channahon, Mokena,
Merrillville, Kentland, Hammond, Minooka, Gary, Marseilles,
Orland Park, Fairbury, Bradley, Gilman, Streator, La Grange,
Oxford, Mendota, Pontiac, Plainfield, Roselawn, Dwight, DeMotte,
and Peotone
855 AM CST Sun Dec 28 2025 /955 AM EST Sun Dec 28 2025/

...WIND ADVISORY REMAINS IN EFFECT FROM 6 PM CST /7 PM EST/ THIS 
EVENING TO 3 PM CST /4 PM EST/ MONDAY...

* WHAT...West winds 25 to 35 mph with gusts up to 50 mph expected.

* WHERE...Portions of central, east central, north central, and 
  northeast Illinois and northwest Indiana.

* WHEN...From 6 PM CST /7 PM EST/ this evening to 3 PM CST /4 PM 
  EST/ Monday.

* IMPACTS...Gusty winds will blow around unsecured objects. Tree 
  limbs could be blown down and a few power outages may result.

* ADDITIONAL DETAILS...Wind-whipped snow showers Sunday night 
  through Monday morning may result in locally hazardous travel 
  conditions.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Winds this strong can make driving difficult, especially for high 
profile vehicles. Use extra caution.

Secure outdoor objects, including holiday decorations.

&&

$$

INZ002-290100-
/O.CON.KLOT.WI.Y.0013.251229T0000Z-251229T2100Z/
Porter-
Including the cities of Valparaiso, Chesterton, and Portage
855 AM CST Sun Dec 28 2025

...WIND ADVISORY REMAINS IN EFFECT FROM 6 PM THIS EVENING TO 3 PM 
CST MONDAY...

* WHAT...West winds 25 to 35 mph with gusts of 45 to 55 mph 
  expected, except 30 to 45 mph with gusts of 50 to 65 mph expected 
  near Lake Michigan.

* WHERE...Porter County.

* WHEN...From 6 PM this evening to 3 PM CST Monday.

* IMPACTS...Gusty winds will blow around unsecured objects. Tree 
  limbs could be blown down and a few power outages may result. Near 
  Lake Michigan winds could down large branches, result in power 
  outages, and make driving of high profile vehicles dangerous on 
  move north south oriented roads.

* ADDITIONAL DETAILS...This wind advisory will likely be upgraded to 
  a high wind warning today due to the expectation of damaging winds 
  occurring near Lake Michigan tonight into Monday morning 
  especially.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Winds this strong can make driving difficult, especially for high 
profile vehicles. Use extra caution.

Secure outdoor objects, including holiday decorations.

&&

$$

Doom

213 
WWUS73 KLOT 282101
NPWLOT

URGENT - WEATHER MESSAGE
National Weather Service Chicago IL
301 PM CST Sun Dec 28 2025

ILZ003>006-008-010>013-019>021-023-032-033-039-103>108-INZ001-010-
011-019-290715-
/O.CON.KLOT.WI.Y.0013.251229T0000Z-251229T2100Z/
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-Newton-Jasper-Benton-
Including the cities of Bolingbrook, Rockford, Joliet, Oak
Forest, Belvidere, Fowler, McHenry, Lemont, Oak Lawn, Paxton,
Park Forest, Merrillville, DeKalb, Aurora, Yorkville, Bradley,
Buffalo Grove, Mendota, Plainfield, Beecher, Peotone, La Salle,
Coal City, Rochelle, Gurnee, Kankakee, Plano, Mundelein,
Naperville, Morocco, Manhattan, Bourbonnais, Dixon, Carol Stream,
Rensselaer, Byron, Crete, Channahon, Gary, Marseilles, Palatine,
Orland Park, La Grange, Pontiac, DeMotte, Chicago, Oregon, Elgin,
Watseka, Woodstock, Des Plaines, Northbrook, Lombard, Ottawa, Oak
Park, Calumet City, Mokena, Kentland, Oxford, Roselawn, Dwight,
Algonquin, Wheaton, Morris, Schaumburg, Cicero, Sycamore, Oswego,
Wilmington, Gibson City, Waukegan, Hammond, Minooka, Evanston,
Fairbury, Crystal Lake, Gilman, Streator, and Downers Grove
301 PM CST Sun Dec 28 2025 /401 PM EST Sun Dec 28 2025/

...WIND ADVISORY REMAINS IN EFFECT FROM 6 PM CST /7 PM EST/ THIS 
EVENING TO 3 PM CST /4 PM EST/ MONDAY...

* WHAT...West winds 25 to 35 mph with gusts of 45 to 55 mph expected.

* WHERE...Portions of central, east central, north central, and 
  northeast Illinois and northwest Indiana.

* WHEN...From 6 PM CST /7 PM EST/ this evening to 3 PM CST /4 PM 
  EST/ Monday.

* IMPACTS...Gusty winds will blow around unsecured objects. Tree 
  limbs could be blown down and a few power outages may result.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Winds this strong can make driving difficult, especially for high 
profile vehicles. Use extra caution.

Secure outdoor objects, including holiday decorations.

&&

$$

INZ002-290715-
/O.CON.KLOT.WI.Y.0013.251229T0000Z-251229T2100Z/
Porter-
Including the cities of Valparaiso, Chesterton, and Portage
301 PM CST Sun Dec 28 2025

...WIND ADVISORY REMAINS IN EFFECT FROM 6 PM THIS EVENING TO 3 PM 
CST MONDAY...

* WHAT...West winds 25 to 35 mph with gusts of 45 to 55 mph 
  expected, except 30 to 45 mph with gusts of 50 to 65 mph expected 
  near Lake Michigan.

* WHERE...Porter County.

* WHEN...From 6 PM this evening to 3 PM CST Monday.

* IMPACTS...Gusty winds will blow around unsecured objects. Tree 
  limbs could be blown down and a few power outages may result. Near 
  Lake Michigan winds could down large branches, result in power 
  outages, and make driving of high profile vehicles dangerous on 
  move north south oriented roads.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Winds this strong can make driving difficult, especially for high 
profile vehicles. Use extra caution.

Secure outdoor objects, including holiday decorations.

&&

$$

Doom

434 
WWUS73 KLOT 290321
NPWLOT

URGENT - WEATHER MESSAGE
National Weather Service Chicago IL
921 PM CST Sun Dec 28 2025

ILZ003>006-008-010>013-019>021-023-032-033-039-103>108-INZ001-010-
011-019-291330-
/O.CON.KLOT.WI.Y.0013.000000T0000Z-251229T2100Z/
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-Newton-Jasper-Benton-
Including the cities of Gilman, Des Plaines, Dwight, Pontiac,
Oxford, Rochelle, Bourbonnais, Oak Forest, Lombard, Yorkville,
DeKalb, Mendota, Palatine, Calumet City, McHenry, Wilmington,
Rockford, Orland Park, Crystal Lake, Minooka, Bradley, Mundelein,
Gurnee, Morocco, Algonquin, Oak Lawn, Kankakee, Sycamore, Lemont,
Rensselaer, Joliet, Streator, Plainfield, Peotone, Schaumburg,
Belvidere, Wheaton, Crete, Park Forest, La Grange, Woodstock,
Gibson City, Downers Grove, Naperville, Northbrook, Plano, Carol
Stream, Manhattan, Coal City, Oregon, Fairbury, Elgin, Waukegan,
Channahon, Paxton, Oak Park, Gary, Roselawn, La Salle, Hammond,
Dixon, Beecher, Merrillville, Aurora, Oswego, Bolingbrook,
Marseilles, Fowler, Buffalo Grove, Morris, Kentland, Ottawa,
Evanston, Byron, Mokena, Watseka, Cicero, Chicago, and DeMotte
921 PM CST Sun Dec 28 2025 /1021 PM EST Sun Dec 28 2025/

...WIND ADVISORY REMAINS IN EFFECT UNTIL 3 PM CST /4 PM EST/ 
MONDAY...

* WHAT...West winds 25 to 35 mph with gusts of 45 to 55 mph expected.

* WHERE...Portions of central, east central, north central, and 
  northeast Illinois and northwest Indiana.

* WHEN...Until 3 PM CST /4 PM EST/ Monday.

* IMPACTS...Gusty winds will blow around unsecured objects. Tree 
  limbs could be blown down and a few power outages may result.

* ADDITIONAL DETAILS...Periods of wind-whipped snow showers tonight 
  through Monday morning may result in locally hazardous travel
  conditions due to snow coating some roads and areas of blowing 
  snow from the strong winds.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Winds this strong can make driving difficult, especially for high 
profile vehicles. Use extra caution.

Secure outdoor objects, including holiday decorations.

&&

$$

INZ002-291330-
/O.CON.KLOT.WI.Y.0013.000000T0000Z-251229T2100Z/
Porter-
Including the cities of Valparaiso, Portage, and Chesterton
921 PM CST Sun Dec 28 2025

...WIND ADVISORY REMAINS IN EFFECT UNTIL 3 PM CST MONDAY...

* WHAT...West winds 25 to 35 mph with gusts of 45 to 55 mph 
  expected, except 30 to 40 mph with gusts of 50 to 60 mph expected 
  near Lake Michigan.

* WHERE...Porter County.

* WHEN...Until 3 PM CST Monday.

* IMPACTS...Gusty winds will blow around unsecured objects. Tree 
  limbs could be blown down and a few power outages may result. Near 
  Lake Michigan winds could down large branches, result in power 
  outages, and make driving of high profile vehicles dangerous on 
  move north south oriented roads.

* ADDITIONAL DETAILS...Wind-whipped snow tonight into Monday morning 
  and lake effect snow on Monday may result in locally hazardous 
  travel conditions due to snow coating some roads and areas of 
  blowing snow from the strong winds.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Winds this strong can make driving difficult, especially for high 
profile vehicles. Use extra caution.

Secure outdoor objects, including holiday decorations.

&&

$$

RC

714 
WWUS73 KLOT 290835
NPWLOT

URGENT - WEATHER MESSAGE
National Weather Service Chicago IL
235 AM CST Mon Dec 29 2025

ILZ003>006-008-010>013-019>021-023-032-033-039-103>108-INZ001-010-
011-019-291800-
/O.EXT.KLOT.WI.Y.0013.000000T0000Z-251229T1800Z/
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-Newton-Jasper-Benton-
Including the cities of Orland Park, Streator, Belvidere, Mokena,
Calumet City, McHenry, Byron, Manhattan, Elgin, Pontiac,
Evanston, Rochelle, Gibson City, Gary, Oak Forest, Morris,
Hammond, Wilmington, Woodstock, Kankakee, Schaumburg, Des
Plaines, Palatine, DeMotte, Carol Stream, Oak Lawn, Paxton,
DeKalb, Fowler, Gurnee, Bolingbrook, Bradley, Joliet, Lombard,
Marseilles, Rockford, Watseka, Kentland, Peotone, Waukegan,
Dwight, Plano, Bourbonnais, Northbrook, Oregon, Minooka, Chicago,
Mundelein, La Grange, Naperville, Rensselaer, Wheaton, Lemont,
Gilman, Ottawa, Mendota, Oswego, Park Forest, Dixon, Beecher,
Downers Grove, Cicero, Yorkville, Morocco, Roselawn, Coal City,
Buffalo Grove, Oak Park, Sycamore, Plainfield, Merrillville,
Channahon, Algonquin, Crystal Lake, Crete, Aurora, La Salle,
Oxford, and Fairbury
235 AM CST Mon Dec 29 2025 /335 AM EST Mon Dec 29 2025/

...WIND ADVISORY NOW IN EFFECT UNTIL NOON CST TODAY...

* WHAT...West winds 25 to 35 mph with gusts of 45 to 55 mph early 
  this morning, easing to occasional gusts to around 45 mph by mid 
  morning.

* WHERE...Northern and central Illinois and extreme northwest Indiana

* WHEN...Until noon CST today.

* IMPACTS...Gusty winds will blow around unsecured objects. Tree 
  limbs could be blown down and a few power outages may result.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Winds this strong can make driving difficult, especially for high 
profile vehicles. Use extra caution.

Secure outdoor objects.

&&

$$

INZ002-291845-
/O.CON.KLOT.WI.Y.0013.000000T0000Z-251229T2100Z/
Porter-
Including the cities of Valparaiso, Chesterton, and Portage
235 AM CST Mon Dec 29 2025

...WIND ADVISORY REMAINS IN EFFECT UNTIL 3 PM CST THIS AFTERNOON...

* WHAT...West winds 25 to 40 mph with gusts of 45 to 55 mph this 
  morning. A few gusts to around 60 mph expected near Lake Michigan. 
  Winds will begin to ease later this morning, though occasional 
  gusts to 45 mph are expected to continue near Lake Michigan into 
  the early afternoon.

* WHERE...Porter County.

* WHEN...Until 3 PM CST this afternoon.

* IMPACTS...Gusty winds will blow around unsecured objects. Tree 
  limbs could be blown down and a few power outages may result.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Winds this strong can make driving difficult, especially for high 
profile vehicles. Use extra caution.

Secure outdoor objects.

&&

$$

- Izzi

466 
WWUS73 KLOT 291603
NPWLOT

URGENT - WEATHER MESSAGE
National Weather Service Chicago IL
1003 AM CST Mon Dec 29 2025

ILZ003>006-008-010>013-019>021-023-032-033-039-103>108-INZ001-010-
011-019-291715-
/O.CAN.KLOT.WI.Y.0013.000000T0000Z-251229T1800Z/
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-Newton-Jasper-Benton-
Including the cities of Park Forest, Calumet City, Merrillville,
Peotone, Des Plaines, Paxton, Cicero, La Salle, Dwight, La
Grange, Elgin, Lemont, Wheaton, McHenry, Mendota, Rockford, Oak
Lawn, Bourbonnais, Watseka, Waukegan, Gibson City, Bradley,
Byron, Palatine, Orland Park, Mundelein, Rensselaer, Rochelle,
Plainfield, DeMotte, Gurnee, Oak Park, Morocco, DeKalb, Streator,
Minooka, Oxford, Buffalo Grove, Aurora, Fairbury, Roselawn,
Downers Grove, Pontiac, Manhattan, Coal City, Kentland,
Bolingbrook, Sycamore, Crystal Lake, Beecher, Morris, Schaumburg,
Gary, Chicago, Ottawa, Evanston, Algonquin, Mokena, Lombard,
Kankakee, Gilman, Dixon, Northbrook, Carol Stream, Crete, Joliet,
Hammond, Oregon, Oak Forest, Channahon, Oswego, Yorkville, Plano,
Naperville, Fowler, Belvidere, Woodstock, Marseilles, and
Wilmington
1003 AM CST Mon Dec 29 2025 /1103 AM EST Mon Dec 29 2025/

...WIND ADVISORY IS CANCELLED...

Winds have diminished below advisory criteria. Gusts to 40 mph late 
this morning will slowly diminish this afternoon.

$$

INZ002-292100-
/O.CON.KLOT.WI.Y.0013.000000T0000Z-251229T2100Z/
Porter-
Including the cities of Valparaiso, Chesterton, and Portage
1003 AM CST Mon Dec 29 2025

...WIND ADVISORY REMAINS IN EFFECT UNTIL 3 PM CST THIS AFTERNOON...

* WHAT...Northwest winds 20 to 30 mph with gusts up to 50 mph.

* WHERE...Porter County.

* WHEN...Until 3 PM CST this afternoon.

* IMPACTS...Gusty winds will blow around unsecured objects. Tree 
  limbs could be blown down and a few power outages may result.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Winds this strong can make driving difficult, especially for high 
profile vehicles. Use extra caution.

Secure outdoor objects.

&&

$$

823 
WWUS73 KLOT 292054
NPWLOT

URGENT - WEATHER MESSAGE
National Weather Service Chicago IL
254 PM CST Mon Dec 29 2025

INZ002-292200-
/O.EXP.KLOT.WI.Y.0013.000000T0000Z-251229T2100Z/
Porter-
Including the cities of Valparaiso, Chesterton, and Portage
254 PM CST Mon Dec 29 2025

...WIND ADVISORY WILL EXPIRE AT 3 PM CST THIS AFTERNOON...

Winds have diminished below advisory levels.

$$

Area Forecast Discussion
National Weather Service Chicago/Romeoville, IL
1207 PM CST Sat Dec 27 2025

.KEY MESSAGES...

- Showers and some thunderstorms likely areawide Sunday into
  early Sunday evening.

- Thunderstorms may pose a locally damaging wind threat Sunday
  afternoon/early evening, mainly southeast of I-55.

- Very strong winds will usher in drastically colder air Sunday
  night into Monday, with some snow showers possible.

&&

.DISCUSSION...
Issued at 332 AM CST Sat Dec 27 2025

Ceilings and visibilities have been very slow to come down so
far this morning, leading to some growing doubts about the
extent of the dense fog threat this morning. Ceilings have
fallen below 500ft far western and southwestern CWA and these
areas stand the best chances at seeing gradually stratus build
down to dense fog this morning. Interestingly, visibilities have
trended upward over the past couple of hours near the
Mississippi River and with light easterly low level flow
developing on the backside of the departing sfc ridge. I am
having some doubts about the dense fog threat into our area this
morning. Opted to maintain areas of dense fog in the grids after
11z or 12z, mainly near/west of the I-39 corridor as well as
near and south of highway 24.

GOES imagery early this morning depicts a massive stratus deck
blanketing the western Great Lakes and much of the Midwest.
Given the sharp inversion that this stratus is trapped beneath,
it seems likely that today will remain overcast. Given the
expected cloud cover have lowered high temps a couple more
degrees with low to mid 40s probably the best we'll be able to
do today. Wouldn't even be surprising to see some interior
portions of northern IL struggle to even reach 40F.

Tonight, a strong upper trough will emerge out onto the northern
and central High Plains. In response, surface cyclogenesis will
take place over Kansas with warm frontogenesis taking place
east from this developing cyclone across northern Missouri into
downstate IL and IN. As height falls spread well east of the
upper trough, it should encourage the development of a 40kt
925mb southerly low level jet across the Mississippi River
Valley. Strengthening isentropic ascent north of the developing
warm front and near the terminus of the low level jet should
result in blossoming area showers overnight tonight across our
CWA.

Strong low level theta-e advection and isentropic ascent is
likely to continue into Sunday morning north of the slowly
northward advancing warm front. Ascent will further be enhanced
by the increasingly diffluent/divergent flow in advance of the
approaching 140kt+ upper level jet. The strong and deep ascent,
couple with ample slant-wise and perhaps some weak upright
instability could allow for some embedded thunderstorms Sunday
morning. This strong forcing and convection will have
essentially record high PWATs leading to the threat of some
locally heavy rainfall Sunday morning into the early afternoon.
Particularly with any training heavier rainfall, which is a bit
of a concern given the low level baroclinic zone becoming
oriented parallel to the strengthening mid-upper level flow in
advance of the mid-upper level trough. Antecedent fairly low
stream flow and still largely unfrozen soils should help
mitigate the flooding risk, but infiltration rates tend to be
lower this time of year and with the potential for 0.75-1.50"
rainfall totals in 3 hours or less, hard to rule out some
nuisance type flooding of low lying and flood prone areas.

This morning rain and convection will probably slow the
northward advance of the warm front and associated unseasonably
warm and humid air mass. Eventually, the strong dynamics
associated with the deepening cyclone should drag the front
northward into at least our southern most CWA. Sfc dewpoints
south of the warm front near or just over 60F should at the very
least weaken the stability of the boundary layer if not result
in a weakly convectively unstable boundary layer conditions.
Wind profiles will only grow increasingly impressive with time
Sunday afternoon and evening as the cyclone enters a period of
rapid intensification. A strongly forced band of low topped
convection is likely to develop along the quickly advancing cold
front Sunday afternoon and evening. Given the strong forcing and
very impressive wind fields, it wouldn't take much, even weak
convection's downdrafts could potentially transport some of the
stronger flow just off the deck to the sfc and result in strong
to locally damaging wind gusts.

Weak low and mid level lapse rates will likely limit
destabilization, leaving the question of whether 60F dewpoints
in and of themselves will be sufficient for some weak boundary
layer destabilization. Just a few hundred J/kg of SB CAPE would
be sufficient for a more meaningful severe weather threat given
the strong forcing and wind fields. The difference between 300
J/kg of SBCAPE and no SBCAPE is really in the noise level of
model guidance at this distance and very difficult to predict.
Unfortunately, that very small difference in instability could
mean the difference between a gusty line of heavier showers and
a more intense squall line with locally damaging winds and
perhaps even a QLCS tornado threat given the extremely strong
low level shear. Interestingly, this time of year it is FAR
easier to get lightning with elevated convection in WAA regimes
than it is along cold fronts. So our highest chances of
lightning look to be earlier in the day Sunday, with a much
lower lightning threat with cold frontal convection, even if we
end up with a few hundred J/kg of SB CAPE. In the end, if a
locally damaging wind threat does materialize with the squall
line it is unlikely to be accompanied by lightning.

The 00z GFS and ECMWF both depict explosive deepening of the
surface cyclone Sunday afternoon and night, with both deepening
the surface low between 23-28mb in just 18 hours. This magnitude
of deepening is rare for this part country and in response, this
projected bomb cyclone will likely result in a large and very
powerful wind field Sunday night into Monday. Very strong cold
air advection will keep boundary layer well mixed overnight
Sunday and Monday, this should aid in transporting some powerful
gusts to the surface. Based on current model output, it is
possible that we could see winds flirting with high wind warning
criteria (sustained winds 40+ mph or gusts 58+ mph) for a short
time period late Sunday night/early Monday morning. It isn't
uncommon for guidance to trend a bit weaker with high winds as
the event nears, so I bumped up winds and gusts solidly into
advisory criteria, but didn't go as high as Bufkit momentum
transfer would suggest (at least not yet).

GFS and ECMWF both still suggest sufficient moisture wrapping
around the occluding cyclone could result in some wind driven
snow showers late Sunday night into Monday morning. Perhaps
enough to cover the ground, but confidence isn't terribly high
in just how much QPF will be flung this far around the cyclone
into our CWA, so didn't make any changes to the modest (30-60%)
POPs late Sunday night into Monday morning.

Temperatures behind this storm will only be slightly below
average, but the strong winds and dramatic contrast from the
unseasonably mild air preceding it, which will make the cold
all that much more biting. Winds will ease Monday night and
begin to back southwesterly Tuesday in advance of low pressure
progged to pass well to our north as it wraps around the
massive departing cyclone tracking north across Quebec. That
will be just one of what looks to be several vort lobes pivoting
around the huge, slow moving, closed mid-upper level low that
becomes established near Hudson Bay.

GFS and ECMWF both suggest a more potent/westward extending
shortwave could pivot around the upper low and dislodge a more
formidable shot of cold air New Year's Eve night into New
Year's Day. Still some variability in ensemble guidance with the
details on just how far west the coldest air gets and also
whether it will be accompanied by any snow. For now, made no
changes to NBM output, but this will be a time period we'll need
to watch in coming days, particularly once we get past the
Sunday-Monday bomb cyclone.

- Izzi

&&

.AVIATION /18Z TAFS THROUGH 00Z MONDAY/...
Issued at 1207 PM CST Sat Dec 27 2025

Key messages:

- Lowering CIGs and VSBYs to LIFR in -DZ and FG tonight into
  Sunday AM (VLIFR possible, especially at RFD/DPA)

- SHRA expected Sunday with embedded TS and gusty winds possible

- Strong NW wind shift expected late Sunday afternoon

An active period of weather is in store tonight through Sunday
as a strong weather system impacts the region. Low IFR stratus
continues across the area this afternoon (LIFR at RFD) which is
expected to remain in place through early evening then
gradually lower through tonight to LIFR and potentially VLIFR.
VSBYs will also be on the downward trend as drizzle begins to
develop mid to late evening. Confidence on just how low both
CIGs and VSBYs get remains on the lower side, but felt
confident enough to introduce low-end LIFR with this update,
especially at RFD and DPA. If trends continue, a mention of
VLIFR CIGs and/or VSBYs may be warranted, potentially for all
sites.

Shower coverage will increase early Sunday morning and continue
through the day. It is possible there are some localized
improvements in CIGs and/or VSBYs during this time but overall
expect LIFR to low-end IFR conditions to prevail through the
day. The potential for embedded TSRA has also increased and
have accordingly introduced a PROB30 for TSRA at ORD/MDW from
17-21Z when the potential is a bit higher, but a few lightning
strikes can't be ruled out earlier in the morning along the
warm front, especially near and south of I-80. Any storms or
convective showers will have the potential to mix down gusty
winds up to 25-30+ kt though the best potential for this
currently favors areas south of I-80.

Winds will remain steady out of the southeast through early this
evening then turn light and variable overnight into the morning
on Sunday. A strong cold front will move across the area late
Sunday afternoon in the wake of the system turning winds
northwest with gusts in excess of 35-40 kt likely to develop
just beyond the current 30-hr TAF period paired with rapidly
falling temperatures and the potential for snow showers.

Petr

&&

.LOT WATCHES/WARNINGS/ADVISORIES...
IL...None.
IN...None.
LM...Storm Watch from Sunday evening through Monday morning for
     Winthrop Harbor IL to Gary IN.

     Storm Watch from Sunday evening through Monday afternoon for
     Gary to Burns Harbor IN-Burns Harbor to Michigan City IN.

&&

Visit us at weather.gov/chicago

Hazardous Weather Outlook
National Weather Service Chicago/Romeoville IL
1104 AM CST Sat Dec 27 2025

ILZ003>006-008-010>013-019>021-023-032-033-039-103>108-INZ001-002-
010-011-019-281715-
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-
1104 AM CST Sat Dec 27 2025 /1204 PM EST Sat Dec 27 2025/

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...

  Limited Fog Risk.

DISCUSSION...

Areas of fog are expected tonight, with dense fog possible,
particularly near and north of I-80.

.DAYS TWO THROUGH SEVEN...Sunday through Friday.

Sunday and Early Sunday Evening...
  Limited Flooding Risk.
  Limited Thunderstorm Risk...with an associated:
     Level 1 of 5 Severe Thunderstorm Risk.
Sunday Night and Monday...
  Elevated Non Thunderstorm Wind Risk.
Thursday and Friday...
  Limited Excessive Cold Risk.

DISCUSSION...

There is a chance of thunderstorms and locally heavy rainfall on
Sunday. Late in the day Sunday into early Sunday evening, there
is a slight chance that some of the heavier showers and possible
thunderstorms could produce damaging winds up to around 60 mph
southeast of I-55 including northwest Indiana.

Strong westerly winds may gust up over 45 mph Sunday night into
Monday morning.

.SPOTTER INFORMATION STATEMENT...

  Spotter activation will not be necessary through tonight.

LMZ740>745-281715-
Winthrop Harbor to Wilmette Harbor IL-
Wilmette Harbor to Northerly Island IL-
Northerly Island to Calumet Harbor IL-
Calumet Harbor IL to Gary IN-Gary to Burns Harbor IN-
Burns Harbor to Michigan City IN-
1104 AM CST Sat Dec 27 2025

This Hazardous Weather Outlook is for portions of the Illinois
nearshore waters of Lake Michigan and the Indiana nearshore
waters of Lake Michigan.

.DAY ONE...This Afternoon and Tonight.

Weather hazards expected...

  Hazardous conditions for small craft.

.DAYS TWO THROUGH SEVEN...Sunday through Friday.

Sunday...
  Limited Thunderstorm Risk.
Sunday night and Monday...
  Storm force winds and hazardous waves.
Tuesday through Thursday...
  Hazardous conditions for small craft are likely.

Doom

Visit us at www.weather.gov/chicago