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Dense Fog Advisory 0004
Issued by the Sioux Falls Forecast Office

Action Issued Starts Expiration
New 2026-02-26 02:42:14 2026-02-26 02:41:00 2026-02-26 09:00:00
Continued 2026-02-26 03:15:45 2026-02-26 09:00:00
Area Extended 2026-02-26 03:15:45 2026-02-26 09:00:00
Continued 2026-02-26 06:09:37 2026-02-26 09:00:00
Cancelled 2026-02-26 06:09:37 2026-02-26 09:00:00
Time Extended 2026-02-26 08:48:12 2026-02-26 11:00:00
Cancelled 2026-02-26 10:08:59 2026-02-26 11:00:00


Action: New
Issued At: 2026-02-26 02:42:14

999 
WWUS73 KFSD 260841
NPWFSD

URGENT - WEATHER MESSAGE
National Weather Service Sioux Falls SD
241 AM CST Thu Feb 26 2026

IAZ002-003-013-014-022-MNZ089-098-261500-
/O.NEW.KFSD.FG.Y.0004.260226T0841Z-260226T1500Z/
Osceola-Dickinson-OBrien-Clay-Buena Vista-Nobles-Rock-
Including the cities of Luverne, Hartley, Sheldon, Spencer,
Worthington, Arnolds Park, Spirit Lake, Milford, Storm Lake,
Sanborn, and Sibley
241 AM CST Thu Feb 26 2026

...DENSE FOG ADVISORY IN EFFECT UNTIL 9 AM CST THIS MORNING...

* WHAT...Visibility of 1/2 mile or less in dense fog.

* WHERE...Portions of northwest Iowa and southwest Minnesota.

* WHEN...Until 9 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.

&&

$$

IG


Action: Continued
Issued At: 2026-02-26 03:15:45

240 
WWUS73 KFSD 260915
NPWFSD

URGENT - WEATHER MESSAGE
National Weather Service Sioux Falls SD
315 AM CST Thu Feb 26 2026

MNZ090-261500-
/O.EXA.KFSD.FG.Y.0004.000000T0000Z-260226T1500Z/
Jackson-
Including the cities of Lakefield and Jackson
315 AM CST Thu Feb 26 2026

...DENSE FOG ADVISORY IN EFFECT UNTIL 9 AM CST THIS MORNING...

* WHAT...Visibilities of a 1/2 mile or less in dense fog.

* WHERE...Jackson County.

* WHEN...Until 9 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.

&&

$$

IAZ002-003-013-014-022-MNZ089-098-261500-
/O.CON.KFSD.FG.Y.0004.000000T0000Z-260226T1500Z/
Osceola-Dickinson-OBrien-Clay-Buena Vista-Nobles-Rock-
Including the cities of Luverne, Hartley, Sheldon, Spencer,
Worthington, Arnolds Park, Spirit Lake, Milford, Storm Lake,
Sanborn, and Sibley
315 AM CST Thu Feb 26 2026

...DENSE FOG ADVISORY REMAINS IN EFFECT UNTIL 9 AM CST THIS 
MORNING...

* WHAT...Visibilities of a 1/2 or less in dense fog.

* WHERE...Portions of northwest Iowa and southwest Minnesota.

* WHEN...Until 9 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.

&&

$$

IG


Action: Area Extended
Issued At: 2026-02-26 03:15:45

240 
WWUS73 KFSD 260915
NPWFSD

URGENT - WEATHER MESSAGE
National Weather Service Sioux Falls SD
315 AM CST Thu Feb 26 2026

MNZ090-261500-
/O.EXA.KFSD.FG.Y.0004.000000T0000Z-260226T1500Z/
Jackson-
Including the cities of Lakefield and Jackson
315 AM CST Thu Feb 26 2026

...DENSE FOG ADVISORY IN EFFECT UNTIL 9 AM CST THIS MORNING...

* WHAT...Visibilities of a 1/2 mile or less in dense fog.

* WHERE...Jackson County.

* WHEN...Until 9 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.

&&

$$

IAZ002-003-013-014-022-MNZ089-098-261500-
/O.CON.KFSD.FG.Y.0004.000000T0000Z-260226T1500Z/
Osceola-Dickinson-OBrien-Clay-Buena Vista-Nobles-Rock-
Including the cities of Luverne, Hartley, Sheldon, Spencer,
Worthington, Arnolds Park, Spirit Lake, Milford, Storm Lake,
Sanborn, and Sibley
315 AM CST Thu Feb 26 2026

...DENSE FOG ADVISORY REMAINS IN EFFECT UNTIL 9 AM CST THIS 
MORNING...

* WHAT...Visibilities of a 1/2 or less in dense fog.

* WHERE...Portions of northwest Iowa and southwest Minnesota.

* WHEN...Until 9 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.

&&

$$

IG


Action: Continued
Issued At: 2026-02-26 06:09:37

615 
WWUS73 KFSD 261209
NPWFSD

URGENT - WEATHER MESSAGE
National Weather Service Sioux Falls SD
609 AM CST Thu Feb 26 2026

IAZ002-013-261315-
/O.CAN.KFSD.FG.Y.0004.000000T0000Z-260226T1500Z/
Osceola-OBrien-
Including the cities of Sibley, Hartley, Sheldon, and Sanborn
609 AM CST Thu Feb 26 2026

...DENSE FOG ADVISORY IS CANCELLED...

Visibilities have started to improve as surface winds strengthened. 
As a result, portions of the dense fog advisory will be cancelled.

$$

IAZ003-014-022-MNZ089-090-098-261500-
/O.CON.KFSD.FG.Y.0004.000000T0000Z-260226T1500Z/
Dickinson-Clay-Buena Vista-Nobles-Jackson-Rock-
Including the cities of Luverne, Jackson, Spencer, Worthington,
Arnolds Park, Storm Lake, Spirit Lake, Milford, and Lakefield
609 AM CST Thu Feb 26 2026

...DENSE FOG ADVISORY REMAINS IN EFFECT UNTIL 9 AM CST THIS 
MORNING...

* WHAT...Visibility of a 1/2 mile or less in dense fog.

* WHERE...Portions of northwest Iowa and southwest Minnesota.

* WHEN...Until 9 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.

&&

$$

IG


Action: Cancelled
Issued At: 2026-02-26 06:09:37

615 
WWUS73 KFSD 261209
NPWFSD

URGENT - WEATHER MESSAGE
National Weather Service Sioux Falls SD
609 AM CST Thu Feb 26 2026

IAZ002-013-261315-
/O.CAN.KFSD.FG.Y.0004.000000T0000Z-260226T1500Z/
Osceola-OBrien-
Including the cities of Sibley, Hartley, Sheldon, and Sanborn
609 AM CST Thu Feb 26 2026

...DENSE FOG ADVISORY IS CANCELLED...

Visibilities have started to improve as surface winds strengthened. 
As a result, portions of the dense fog advisory will be cancelled.

$$

IAZ003-014-022-MNZ089-090-098-261500-
/O.CON.KFSD.FG.Y.0004.000000T0000Z-260226T1500Z/
Dickinson-Clay-Buena Vista-Nobles-Jackson-Rock-
Including the cities of Luverne, Jackson, Spencer, Worthington,
Arnolds Park, Storm Lake, Spirit Lake, Milford, and Lakefield
609 AM CST Thu Feb 26 2026

...DENSE FOG ADVISORY REMAINS IN EFFECT UNTIL 9 AM CST THIS 
MORNING...

* WHAT...Visibility of a 1/2 mile or less in dense fog.

* WHERE...Portions of northwest Iowa and southwest Minnesota.

* WHEN...Until 9 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.

&&

$$

IG


Action: Time Extended
Issued At: 2026-02-26 08:48:12

570 
WWUS73 KFSD 261448
NPWFSD

URGENT - WEATHER MESSAGE
National Weather Service Sioux Falls SD
848 AM CST Thu Feb 26 2026

IAZ003-014-022-MNZ089-090-098-261700-
/O.EXT.KFSD.FG.Y.0004.000000T0000Z-260226T1700Z/
Dickinson-Clay-Buena Vista-Nobles-Jackson-Rock-
Including the cities of Storm Lake, Luverne, Spirit Lake,
Milford, Spencer, Jackson, Worthington, Lakefield, and Arnolds
Park
848 AM CST Thu Feb 26 2026

...DENSE FOG ADVISORY NOW IN EFFECT UNTIL 11 AM CST THIS MORNING...

* WHAT...Visibility of a 1/2 mile or less in dense fog.

* WHERE...Portions of northwest Iowa and southwest Minnesota.

* WHEN...Until 11 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.

&&

$$

Rogers


Action: Cancelled
Issued At: 2026-02-26 10:08:59

358 
WWUS73 KFSD 261608
NPWFSD

URGENT - WEATHER MESSAGE
National Weather Service Sioux Falls SD
1008 AM CST Thu Feb 26 2026

IAZ003-014-022-MNZ089-090-098-261715-
/O.CAN.KFSD.FG.Y.0004.000000T0000Z-260226T1700Z/
Dickinson-Clay-Buena Vista-Nobles-Jackson-Rock-
Including the cities of Storm Lake, Luverne, Spirit Lake,
Milford, Spencer, Jackson, Worthington, Lakefield, and Arnolds
Park
1008 AM CST Thu Feb 26 2026

...DENSE FOG ADVISORY IS CANCELLED...

Dense fog from earlier this morning across portions of southwest 
Minnesota and northwest Iowa has dissipated, allowing the Dense Fog 
Advisory to be cancelled.

$$

Rogers



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