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Dense Fog Advisory 0018
Issued by the St. Louis Forecast Office

Action Issued Starts Expiration
New 2025-12-24 12:49:49 2025-12-24 21:00:00 2025-12-25 10:00:00
Time and Area Extended 2025-12-24 19:34:29 2025-12-24 19:33:00 2025-12-25 10:00:00
Time Extended 2025-12-24 19:34:29 2025-12-24 19:33:00 2025-12-25 10:00:00
Continued 2025-12-25 00:06:06 2025-12-25 10:00:00
Area Extended 2025-12-25 00:06:06 2025-12-25 10:00:00
Time Extended 2025-12-25 08:30:42 2025-12-25 12:00:00
Expired 2025-12-25 11:51:17 2025-12-25 12:00:00
Time Extended 2025-12-25 11:51:17 2025-12-26 09:00:00


Action: New
Issued At: 2025-12-24 12:49:49

601 
WWUS73 KLSX 241849
NPWLSX

URGENT - WEATHER MESSAGE
National Weather Service St Louis MO
1249 PM CST Wed Dec 24 2025

ILZ058>060-095>099-MOZ018-019-026-027-034>036-041-042-050>052-251000-
/O.NEW.KLSX.FG.Y.0018.251225T0300Z-251225T1600Z/
Greene IL-Macoupin IL-Montgomery IL-Adams IL-Brown IL-Pike IL-
Calhoun IL-Jersey IL-Knox MO-Lewis MO-Shelby MO-Marion MO-Monroe
MO-Ralls MO-Pike MO-Boone MO-Audrain MO-Callaway MO-Montgomery MO-
Lincoln MO-
Including the cities of Quincy, Bowling Green, Fulton, Columbia,
Mount Sterling, Pittsfield, Mexico, Hannibal, and Litchfield
1249 PM CST Wed Dec 24 2025

...DENSE FOG ADVISORY IN EFFECT FROM 9 PM THIS EVENING TO 10 AM CST
THURSDAY...

* WHAT...Visibility one quarter mile or less in dense fog.

* WHERE...Portions of south central, southwest, and west central
  Illinois and central, east central, and northeast Missouri.

* WHEN...From 9 PM this evening to 10 AM CST Thursday.

* IMPACTS...Low visibility could make driving conditions hazardous.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

$$

Kimble


Action: Time and Area Extended
Issued At: 2025-12-24 19:34:29

459 
WWUS73 KLSX 250133
NPWLSX

URGENT - WEATHER MESSAGE
National Weather Service St Louis MO
733 PM CST Wed Dec 24 2025

ILZ064-065-100-251600-
/O.EXB.KLSX.FG.Y.0018.251225T0133Z-251225T1600Z/
Bond IL-Fayette IL-Madison IL-
Including the cities of Vandalia, Alton, and Edwardsville
733 PM CST Wed Dec 24 2025

...DENSE FOG ADVISORY IN EFFECT UNTIL 10 AM CST THURSDAY...

* WHAT...Visibility one quarter to one half mile in dense fog.

* WHERE...Bond IL, Fayette IL, and Madison IL Counties.

* WHEN...Until 10 AM CST Thursday.

* IMPACTS...Low visibility could make driving conditions hazardous.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

$$

ILZ058>060-095>099-MOZ018-019-026-027-034>036-041-042-050>052-251600-
/O.EXT.KLSX.FG.Y.0018.251225T0133Z-251225T1600Z/
Greene IL-Macoupin IL-Montgomery IL-Adams IL-Brown IL-Pike IL-
Calhoun IL-Jersey IL-Knox MO-Lewis MO-Shelby MO-Marion MO-Monroe
MO-Ralls MO-Pike MO-Boone MO-Audrain MO-Callaway MO-Montgomery MO-
Lincoln MO-
Including the cities of Litchfield, Hannibal, Mount Sterling,
Columbia, Mexico, Pittsfield, Fulton, Bowling Green, and Quincy
733 PM CST Wed Dec 24 2025

...DENSE FOG ADVISORY NOW IN EFFECT UNTIL 10 AM CST THURSDAY...

* WHAT...Visibility one quarter mile or less in dense fog.

* WHERE...Portions of south central, southwest, and west central
  Illinois and central, east central, and northeast Missouri.

* WHEN...Until 10 AM CST Thursday.

* IMPACTS...Low visibility could make driving conditions hazardous.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

$$

Jaja


Action: Time Extended
Issued At: 2025-12-24 19:34:29

459 
WWUS73 KLSX 250133
NPWLSX

URGENT - WEATHER MESSAGE
National Weather Service St Louis MO
733 PM CST Wed Dec 24 2025

ILZ064-065-100-251600-
/O.EXB.KLSX.FG.Y.0018.251225T0133Z-251225T1600Z/
Bond IL-Fayette IL-Madison IL-
Including the cities of Vandalia, Alton, and Edwardsville
733 PM CST Wed Dec 24 2025

...DENSE FOG ADVISORY IN EFFECT UNTIL 10 AM CST THURSDAY...

* WHAT...Visibility one quarter to one half mile in dense fog.

* WHERE...Bond IL, Fayette IL, and Madison IL Counties.

* WHEN...Until 10 AM CST Thursday.

* IMPACTS...Low visibility could make driving conditions hazardous.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

$$

ILZ058>060-095>099-MOZ018-019-026-027-034>036-041-042-050>052-251600-
/O.EXT.KLSX.FG.Y.0018.251225T0133Z-251225T1600Z/
Greene IL-Macoupin IL-Montgomery IL-Adams IL-Brown IL-Pike IL-
Calhoun IL-Jersey IL-Knox MO-Lewis MO-Shelby MO-Marion MO-Monroe
MO-Ralls MO-Pike MO-Boone MO-Audrain MO-Callaway MO-Montgomery MO-
Lincoln MO-
Including the cities of Litchfield, Hannibal, Mount Sterling,
Columbia, Mexico, Pittsfield, Fulton, Bowling Green, and Quincy
733 PM CST Wed Dec 24 2025

...DENSE FOG ADVISORY NOW IN EFFECT UNTIL 10 AM CST THURSDAY...

* WHAT...Visibility one quarter mile or less in dense fog.

* WHERE...Portions of south central, southwest, and west central
  Illinois and central, east central, and northeast Missouri.

* WHEN...Until 10 AM CST Thursday.

* IMPACTS...Low visibility could make driving conditions hazardous.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

$$

Jaja


Action: Continued
Issued At: 2025-12-25 00:06:06

082 
WWUS73 KLSX 250605
NPWLSX

URGENT - WEATHER MESSAGE
National Weather Service St Louis MO
1205 AM CST Thu Dec 25 2025

MOZ060-061-251600-
/O.EXA.KLSX.FG.Y.0018.000000T0000Z-251225T1600Z/
Warren MO-Saint Charles MO-
Including the cities of Saint Charles
1205 AM CST Thu Dec 25 2025

...DENSE FOG ADVISORY IN EFFECT UNTIL 10 AM CST THIS MORNING...

* WHAT...Visibility one quarter mile or less in dense fog.

* WHERE...Saint Charles MO and Warren MO Counties.

* WHEN...Until 10 AM CST this morning.

* IMPACTS...Low visibility could make driving conditions hazardous.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

$$

ILZ058>060-064-065-095>100-MOZ018-019-026-027-034>036-041-042-
050>052-251600-
/O.CON.KLSX.FG.Y.0018.000000T0000Z-251225T1600Z/
Greene IL-Macoupin IL-Montgomery IL-Bond IL-Fayette IL-Adams IL-
Brown IL-Pike IL-Calhoun IL-Jersey IL-Madison IL-Knox MO-Lewis MO-
Shelby MO-Marion MO-Monroe MO-Ralls MO-Pike MO-Boone MO-Audrain
MO-Callaway MO-Montgomery MO-Lincoln MO-
Including the cities of Alton, Fulton, Vandalia, Quincy, Hannibal,
Mount Sterling, Mexico, Edwardsville, Pittsfield, Litchfield,
Columbia, and Bowling Green
1205 AM CST Thu Dec 25 2025

...DENSE FOG ADVISORY REMAINS IN EFFECT UNTIL 10 AM CST THIS
MORNING...

* WHAT...Visibility one quarter mile or less in dense fog.

* WHERE...Portions of south central, southwest, and west central
  Illinois and central, east central, and northeast Missouri.

* WHEN...Until 10 AM CST this morning.

* IMPACTS...Low visibility could make driving conditions hazardous.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

$$

Maples


Action: Area Extended
Issued At: 2025-12-25 00:06:06

082 
WWUS73 KLSX 250605
NPWLSX

URGENT - WEATHER MESSAGE
National Weather Service St Louis MO
1205 AM CST Thu Dec 25 2025

MOZ060-061-251600-
/O.EXA.KLSX.FG.Y.0018.000000T0000Z-251225T1600Z/
Warren MO-Saint Charles MO-
Including the cities of Saint Charles
1205 AM CST Thu Dec 25 2025

...DENSE FOG ADVISORY IN EFFECT UNTIL 10 AM CST THIS MORNING...

* WHAT...Visibility one quarter mile or less in dense fog.

* WHERE...Saint Charles MO and Warren MO Counties.

* WHEN...Until 10 AM CST this morning.

* IMPACTS...Low visibility could make driving conditions hazardous.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

$$

ILZ058>060-064-065-095>100-MOZ018-019-026-027-034>036-041-042-
050>052-251600-
/O.CON.KLSX.FG.Y.0018.000000T0000Z-251225T1600Z/
Greene IL-Macoupin IL-Montgomery IL-Bond IL-Fayette IL-Adams IL-
Brown IL-Pike IL-Calhoun IL-Jersey IL-Madison IL-Knox MO-Lewis MO-
Shelby MO-Marion MO-Monroe MO-Ralls MO-Pike MO-Boone MO-Audrain
MO-Callaway MO-Montgomery MO-Lincoln MO-
Including the cities of Alton, Fulton, Vandalia, Quincy, Hannibal,
Mount Sterling, Mexico, Edwardsville, Pittsfield, Litchfield,
Columbia, and Bowling Green
1205 AM CST Thu Dec 25 2025

...DENSE FOG ADVISORY REMAINS IN EFFECT UNTIL 10 AM CST THIS
MORNING...

* WHAT...Visibility one quarter mile or less in dense fog.

* WHERE...Portions of south central, southwest, and west central
  Illinois and central, east central, and northeast Missouri.

* WHEN...Until 10 AM CST this morning.

* IMPACTS...Low visibility could make driving conditions hazardous.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

$$

Maples


Action: Time Extended
Issued At: 2025-12-25 08:30:42

048 
WWUS73 KLSX 251430
NPWLSX

URGENT - WEATHER MESSAGE
National Weather Service St Louis MO
830 AM CST Thu Dec 25 2025

ILZ058>060-064-065-095>100-MOZ018-019-026-027-034>036-041-042-
050>052-060-061-251800-
/O.EXT.KLSX.FG.Y.0018.000000T0000Z-251225T1800Z/
Greene IL-Macoupin IL-Montgomery IL-Bond IL-Fayette IL-Adams IL-
Brown IL-Pike IL-Calhoun IL-Jersey IL-Madison IL-Knox MO-Lewis MO-
Shelby MO-Marion MO-Monroe MO-Ralls MO-Pike MO-Boone MO-Audrain
MO-Callaway MO-Montgomery MO-Lincoln MO-Warren MO-Saint Charles
MO-
Including the cities of Columbia, Pittsfield, Quincy, Vandalia,
Alton, Litchfield, Edwardsville, Mexico, Saint Charles, Mount
Sterling, Hannibal, Bowling Green, and Fulton
830 AM CST Thu Dec 25 2025

...DENSE FOG ADVISORY NOW IN EFFECT UNTIL NOON CST TODAY...

* WHAT...Visibility one quarter mile or less in dense fog.

* WHERE...Portions of south central, southwest, and west central
  Illinois and central, east central, and northeast Missouri.

* WHEN...Until noon CST today.

* IMPACTS...Low visibility could make driving conditions hazardous.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

$$

Kimble


Action: Expired
Issued At: 2025-12-25 11:51:17

177 
WWUS73 KLSX 251750
NPWLSX

URGENT - WEATHER MESSAGE
National Weather Service St Louis MO
1150 AM CST Thu Dec 25 2025

ILZ058>060-064-065-098>100-MOZ041-042-050>052-060-061-251900-
/O.EXP.KLSX.FG.Y.0018.000000T0000Z-251225T1800Z/
Greene IL-Macoupin IL-Montgomery IL-Bond IL-Fayette IL-Calhoun IL-
Jersey IL-Madison IL-Boone MO-Audrain MO-Callaway MO-Montgomery
MO-Lincoln MO-Warren MO-Saint Charles MO-
Including the cities of Columbia, Vandalia, Alton, Edwardsville,
Litchfield, Mexico, Saint Charles, and Fulton
1150 AM CST Thu Dec 25 2025

...DENSE FOG ADVISORY WILL EXPIRE AT NOON CST TODAY...

Visibility is improving today.

$$

ILZ095>097-MOZ018-019-026-027-034>036-260900-
/O.EXT.KLSX.FG.Y.0018.000000T0000Z-251226T1500Z/
Adams IL-Brown IL-Pike IL-Knox MO-Lewis MO-Shelby MO-Marion MO-
Monroe MO-Ralls MO-Pike MO-
Including the cities of Pittsfield, Quincy, Mount Sterling, Hannibal,
and Bowling Green
1150 AM CST Thu Dec 25 2025

...DENSE FOG ADVISORY NOW IN EFFECT UNTIL 9 AM CST FRIDAY...

* WHAT...Visibility one quarter mile or less in dense fog.

* WHERE...In Illinois, Adams IL, Brown IL, and Pike IL Counties. In
  Missouri, Knox MO, Lewis MO, Marion MO, Monroe MO, Pike MO, Ralls
  MO, and Shelby MO Counties.

* WHEN...Until 9 AM CST Friday.

* IMPACTS...Low visibility could make driving conditions hazardous.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

$$

Kimble


Action: Time Extended
Issued At: 2025-12-25 11:51:17

177 
WWUS73 KLSX 251750
NPWLSX

URGENT - WEATHER MESSAGE
National Weather Service St Louis MO
1150 AM CST Thu Dec 25 2025

ILZ058>060-064-065-098>100-MOZ041-042-050>052-060-061-251900-
/O.EXP.KLSX.FG.Y.0018.000000T0000Z-251225T1800Z/
Greene IL-Macoupin IL-Montgomery IL-Bond IL-Fayette IL-Calhoun IL-
Jersey IL-Madison IL-Boone MO-Audrain MO-Callaway MO-Montgomery
MO-Lincoln MO-Warren MO-Saint Charles MO-
Including the cities of Columbia, Vandalia, Alton, Edwardsville,
Litchfield, Mexico, Saint Charles, and Fulton
1150 AM CST Thu Dec 25 2025

...DENSE FOG ADVISORY WILL EXPIRE AT NOON CST TODAY...

Visibility is improving today.

$$

ILZ095>097-MOZ018-019-026-027-034>036-260900-
/O.EXT.KLSX.FG.Y.0018.000000T0000Z-251226T1500Z/
Adams IL-Brown IL-Pike IL-Knox MO-Lewis MO-Shelby MO-Marion MO-
Monroe MO-Ralls MO-Pike MO-
Including the cities of Pittsfield, Quincy, Mount Sterling, Hannibal,
and Bowling Green
1150 AM CST Thu Dec 25 2025

...DENSE FOG ADVISORY NOW IN EFFECT UNTIL 9 AM CST FRIDAY...

* WHAT...Visibility one quarter mile or less in dense fog.

* WHERE...In Illinois, Adams IL, Brown IL, and Pike IL Counties. In
  Missouri, Knox MO, Lewis MO, Marion MO, Monroe MO, Pike MO, Ralls
  MO, and Shelby MO Counties.

* WHEN...Until 9 AM CST Friday.

* IMPACTS...Low visibility could make driving conditions hazardous.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

$$

Kimble



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