Severe Center
Washington D.C & Central Maryland & N. Virginia & E. West Virginia Warnings, Watches, And Advisories Dense Fog Advisory
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Dense Fog Advisory
In effect:
Friday, Apr 17 2026 10:23 AM CDT – Saturday, Apr 18 2026 4:00 AM CDT
Issued by NWS Green Bay WI
DENSE FOG ADVISORY NOW IN EFFECT UNTIL 4 AM CDT SATURDAY... ...SMALL CRAFT ADVISORY REMAINS IN EFFECT FROM 3 PM THIS AFTERNOON TO 4 AM CDT SATURDAY
What:
For the Dense Fog Advisory, dense fog will reduce
visibility to 1 NM or less. For the Small Craft Advisory, south
winds 10 to 20 kts with gusts up to 25 kts and waves 2 to 4 ft
expected.
For the Dense Fog Advisory, dense fog will reduce
visibility to 1 NM or less. For the Small Craft Advisory, south
winds 10 to 20 kts with gusts up to 25 kts and waves 2 to 4 ft
expected.
Where:
Central Bay of Green Bay.
Central Bay of Green Bay.
When:
For the Dense Fog Advisory, until 4 AM CDT Saturday.
For the Small Craft Advisory, from 3 PM this afternoon to 4 AM
CDT Saturday.
For the Dense Fog Advisory, until 4 AM CDT Saturday.
For the Small Craft Advisory, from 3 PM this afternoon to 4 AM
CDT Saturday.
Impacts:
Conditions will be hazardous to small craft. Low
visibility will make navigation difficult.
Conditions will be hazardous to small craft. Low
visibility will make navigation difficult.
Instructions:
Inexperienced mariners, especially those operating smaller
vessels, should avoid navigating in hazardous conditions.
If you must navigate, proceed with caution. Use proper fog
signals. Make sure all running lights are on. Remember to use
your radar and compass.
Inexperienced mariners, especially those operating smaller
vessels, should avoid navigating in hazardous conditions.
If you must navigate, proceed with caution. Use proper fog
signals. Make sure all running lights are on. Remember to use
your radar and compass.
Areas Impacted:
Green Bay south of line from Cedar River to Rock Island Passage and north of a line from Oconto WI to Little Sturgeon Bay WI
Dense Fog Advisory
In effect:
Friday, Apr 17 2026 10:23 AM CDT – Saturday, Apr 18 2026 4:00 AM CDT
Issued by NWS Green Bay WI
DENSE FOG ADVISORY NOW IN EFFECT UNTIL 4 AM CDT SATURDAY... ...SMALL CRAFT ADVISORY REMAINS IN EFFECT FROM 3 PM THIS AFTERNOON TO 10 AM CDT SATURDAY
What:
For the Dense Fog Advisory, dense fog will reduce
visibility to 1/4 NM or less. For the Small Craft Advisory,
southwest winds 15 to 20 kts with gusts up to 30 kts and waves
4 to 7 ft expected.
For the Dense Fog Advisory, dense fog will reduce
visibility to 1/4 NM or less. For the Small Craft Advisory,
southwest winds 15 to 20 kts with gusts up to 30 kts and waves
4 to 7 ft expected.
Where:
Lake Michigan nearshore waters from Washington Island
to Sheboygan.
Lake Michigan nearshore waters from Washington Island
to Sheboygan.
When:
For the Dense Fog Advisory, until 4 AM CDT Saturday.
For the Small Craft Advisory, from 3 PM this afternoon to 10
AM CDT Saturday.
For the Dense Fog Advisory, until 4 AM CDT Saturday.
For the Small Craft Advisory, from 3 PM this afternoon to 10
AM CDT Saturday.
Impacts:
Conditions will be hazardous to small craft. Low
visibility will make navigation difficult.
Conditions will be hazardous to small craft. Low
visibility will make navigation difficult.
Instructions:
Inexperienced mariners, especially those operating smaller
vessels, should avoid navigating in hazardous conditions.
If you must navigate, proceed with caution. Use proper fog
signals. Make sure all running lights are on. Remember to use
your radar and compass.
Inexperienced mariners, especially those operating smaller
vessels, should avoid navigating in hazardous conditions.
If you must navigate, proceed with caution. Use proper fog
signals. Make sure all running lights are on. Remember to use
your radar and compass.
Areas Impacted:
Rock Island Passage to Sturgeon Bay WI
Sturgeon Bay to Two Rivers WI
Two Rivers to Sheboygan WI
Dense Fog Advisory
In effect:
Friday, Apr 17 2026 11:05 AM EDT – Friday, Apr 17 2026 2:00 PM EDT
Issued by NWS Marquette MI
DENSE FOG ADVISORY REMAINS IN EFFECT UNTIL 1 PM CDT /2 PM EDT/ THIS AFTERNOON
What:
Visibility 1/4 mile or less in dense fog.
Visibility 1/4 mile or less in dense fog.
Where:
Delta and Menominee Counties.
Delta and Menominee Counties.
When:
Until 1 PM CDT /2 PM EDT/ this afternoon.
Until 1 PM CDT /2 PM EDT/ this afternoon.
Impacts:
Low visibility could make driving conditions hazardous.
Low visibility could make driving conditions hazardous.
Additional Details:
Fog will be most dense near the lakeshore.
Fog should become less dense or clear this afternoon.
Fog will be most dense near the lakeshore.
Fog should become less dense or clear this afternoon.
Instructions:
If driving, slow down, use your headlights, and leave plenty of
distance ahead of you.
If driving, slow down, use your headlights, and leave plenty of
distance ahead of you.
Areas Impacted:
Menominee
Delta
Dense Fog Advisory
In effect:
Friday, Apr 17 2026 11:02 AM EDT – Friday, Apr 17 2026 8:00 PM EDT
Issued by NWS Marquette MI
DENSE FOG ADVISORY IN EFFECT UNTIL 8 PM EDT THIS EVENING... ...SMALL CRAFT ADVISORY REMAINS IN EFFECT FROM 7 PM THIS EVENING TO 11 AM EDT SATURDAY
What:
For the Dense Fog Advisory, dense fog will reduce
visibility to less than one nautical mile. For the Small Craft
Advisory, southwest winds 10 to 20 kt with gusts up to 30 kt
and waves 3 to 6 ft expected.
For the Dense Fog Advisory, dense fog will reduce
visibility to less than one nautical mile. For the Small Craft
Advisory, southwest winds 10 to 20 kt with gusts up to 30 kt
and waves 3 to 6 ft expected.
Where:
Seul Choix Point to Point Detour MI and 5NM East of a
line from Fairport MI to Rock Island Passage.
Seul Choix Point to Point Detour MI and 5NM East of a
line from Fairport MI to Rock Island Passage.
When:
For the Dense Fog Advisory, until 8 PM EDT this
evening. For the Small Craft Advisory, from 7 PM this evening
to 11 AM EDT Saturday.
For the Dense Fog Advisory, until 8 PM EDT this
evening. For the Small Craft Advisory, from 7 PM this evening
to 11 AM EDT Saturday.
Impacts:
Conditions will be hazardous to small craft. Low
visibility will make navigation difficult.
Conditions will be hazardous to small craft. Low
visibility will make navigation difficult.
Instructions:
Inexperienced mariners, especially those operating smaller
vessels, should avoid navigating in hazardous conditions.
If you must navigate, proceed with caution. Use proper fog
signals. Make sure all running lights are on. Remember to use
your radar and compass.
Inexperienced mariners, especially those operating smaller
vessels, should avoid navigating in hazardous conditions.
If you must navigate, proceed with caution. Use proper fog
signals. Make sure all running lights are on. Remember to use
your radar and compass.
Areas Impacted:
Seul Choix Point to Point Detour MI
5NM East of a line from Fairport MI to Rock Island Passage
Dense Fog Advisory
In effect:
Friday, Apr 17 2026 11:02 AM EDT – Friday, Apr 17 2026 8:00 PM EDT
Issued by NWS Marquette MI
DENSE FOG ADVISORY IN EFFECT UNTIL 8 PM EDT THIS EVENING... ...SMALL CRAFT ADVISORY REMAINS IN EFFECT FROM 10 PM THIS EVENING TO 8 AM EDT SATURDAY
What:
For the Dense Fog Advisory, dense fog will reduce
visibility to less than one nautical mile. For the Small Craft
Advisory, southwest winds 10 to 20 kt with gusts up to 25 kt
and waves 1 to 4 ft expected.
For the Dense Fog Advisory, dense fog will reduce
visibility to less than one nautical mile. For the Small Craft
Advisory, southwest winds 10 to 20 kt with gusts up to 25 kt
and waves 1 to 4 ft expected.
Where:
Green Bay North of line from Cedar River MI to Rock
Island Passage.
Green Bay North of line from Cedar River MI to Rock
Island Passage.
When:
For the Dense Fog Advisory, until 8 PM EDT this
evening. For the Small Craft Advisory, from 10 PM this evening
to 8 AM EDT Saturday.
For the Dense Fog Advisory, until 8 PM EDT this
evening. For the Small Craft Advisory, from 10 PM this evening
to 8 AM EDT Saturday.
Impacts:
Conditions will be hazardous to small craft. Low
visibility will make navigation difficult.
Conditions will be hazardous to small craft. Low
visibility will make navigation difficult.
Instructions:
Inexperienced mariners, especially those operating smaller
vessels, should avoid navigating in hazardous conditions.
If you must navigate, proceed with caution. Use proper fog
signals. Make sure all running lights are on. Remember to use
your radar and compass.
Inexperienced mariners, especially those operating smaller
vessels, should avoid navigating in hazardous conditions.
If you must navigate, proceed with caution. Use proper fog
signals. Make sure all running lights are on. Remember to use
your radar and compass.
Areas Impacted:
Green Bay North of line from Cedar River MI to Rock Island Passage
Dense Fog Advisory
In effect:
Friday, Apr 17 2026 10:56 AM EDT – Friday, Apr 17 2026 8:00 PM EDT
Issued by NWS Grand Rapids MI
DENSE FOG ADVISORY REMAINS IN EFFECT UNTIL 8 PM EDT THIS EVENING... ...SMALL CRAFT ADVISORY REMAINS IN EFFECT FROM 8 PM THIS EVENING TO 8 AM EDT SUNDAY
What:
For the Dense Fog Advisory, dense fog will reduce
visibility to one nautical mile. For the Small Craft Advisory,
west winds 15 to 25 knots with gusts up to 30 knots and waves 3
to 6 feet expected.
For the Dense Fog Advisory, dense fog will reduce
visibility to one nautical mile. For the Small Craft Advisory,
west winds 15 to 25 knots with gusts up to 30 knots and waves 3
to 6 feet expected.
Where:
St Joseph to Manistee.
St Joseph to Manistee.
When:
For the Dense Fog Advisory, until 8 PM EDT this
evening. For the Small Craft Advisory, from 8 PM this evening
to 8 AM EDT Sunday.
For the Dense Fog Advisory, until 8 PM EDT this
evening. For the Small Craft Advisory, from 8 PM this evening
to 8 AM EDT Sunday.
Impacts:
Conditions will be hazardous to small craft. Low
visibility will make navigation difficult.
Conditions will be hazardous to small craft. Low
visibility will make navigation difficult.
Instructions:
Inexperienced mariners, especially those operating smaller
vessels, should avoid navigating in hazardous conditions.
If you must navigate, proceed with caution. Use proper fog
signals. Make sure all running lights are on. Remember to use
your radar and compass.
Inexperienced mariners, especially those operating smaller
vessels, should avoid navigating in hazardous conditions.
If you must navigate, proceed with caution. Use proper fog
signals. Make sure all running lights are on. Remember to use
your radar and compass.
Areas Impacted:
St Joseph to South Haven MI
South Haven to Holland MI
Holland to Grand Haven MI
Grand Haven to Whitehall MI
Whitehall to Pentwater MI
Pentwater to Manistee MI
Dense Fog Advisory
In effect:
Friday, Apr 17 2026 10:53 AM EDT – Friday, Apr 17 2026 4:00 PM EDT
Issued by NWS Buffalo NY
DENSE FOG ADVISORY NOW IN EFFECT UNTIL 4 PM EDT THIS AFTERNOON
What:
Dense fog will reduce visibility to less than one
nautical mile.
Dense fog will reduce visibility to less than one
nautical mile.
Where:
The nearshore waters of Lake Erie from Ripley to
Buffalo.
The nearshore waters of Lake Erie from Ripley to
Buffalo.
When:
Until 4 PM EDT this afternoon.
Until 4 PM EDT this afternoon.
Impacts:
Low visibility will make navigation difficult.
Low visibility will make navigation difficult.
Instructions:
If you must navigate, proceed with caution. Use proper fog
signals. Make sure all running lights are on. Remember to use
your radar and compass.
If you must navigate, proceed with caution. Use proper fog
signals. Make sure all running lights are on. Remember to use
your radar and compass.
Areas Impacted:
Ripley to Dunkirk NY
Dunkirk to Buffalo NY
Dense Fog Advisory
In effect:
Friday, Apr 17 2026 9:07 AM CDT – Friday, Apr 17 2026 7:00 PM CDT
Issued by NWS Milwaukee/Sullivan WI
DENSE FOG ADVISORY REMAINS IN EFFECT UNTIL 7 PM CDT THIS EVENING... ...SMALL CRAFT ADVISORY REMAINS IN EFFECT FROM 1 PM THIS AFTERNOON TO 10 PM CDT SATURDAY
What:
For the Dense Fog Advisory, dense fog will reduce
visibility to 1/4 NM or less. For the Small Craft Advisory,
south to southeast winds around 15 kt with gusts up to 25 kt and
waves 3 to 6 ft this afternoon and evening. Winds turn west to
northwest tonight, remaining gusty into Saturday.
For the Dense Fog Advisory, dense fog will reduce
visibility to 1/4 NM or less. For the Small Craft Advisory,
south to southeast winds around 15 kt with gusts up to 25 kt and
waves 3 to 6 ft this afternoon and evening. Winds turn west to
northwest tonight, remaining gusty into Saturday.
Where:
Nearshore Waters from Sheboygan to Winthrop Harbor IL.
Nearshore Waters from Sheboygan to Winthrop Harbor IL.
When:
For the Dense Fog Advisory, until 7 PM CDT this
evening. For the Small Craft Advisory, from 1 PM this
afternoon to 10 PM CDT Saturday.
For the Dense Fog Advisory, until 7 PM CDT this
evening. For the Small Craft Advisory, from 1 PM this
afternoon to 10 PM CDT Saturday.
Impacts:
Conditions will be hazardous to small craft. Low
visibility will make navigation difficult.
Conditions will be hazardous to small craft. Low
visibility will make navigation difficult.
Instructions:
Inexperienced mariners, especially those operating smaller
vessels, should avoid navigating in hazardous conditions.
If you must navigate, proceed with caution. Use proper fog
signals. Make sure all running lights are on. Remember to use
your radar and compass.
Inexperienced mariners, especially those operating smaller
vessels, should avoid navigating in hazardous conditions.
If you must navigate, proceed with caution. Use proper fog
signals. Make sure all running lights are on. Remember to use
your radar and compass.
Areas Impacted:
Sheboygan to Port Washington WI
Port Washington to North Point Light WI
North Point Light to Wind Point WI
Wind Point WI to Winthrop Harbor IL
Dense Fog Advisory
In effect:
Friday, Apr 17 2026 9:07 AM CDT – Friday, Apr 17 2026 7:00 PM CDT
Issued by NWS Milwaukee/Sullivan WI
DENSE FOG ADVISORY REMAINS IN EFFECT UNTIL 7 PM CDT THIS EVENING
What:
Dense fog will reduce visibility to 1/4 NM or less.
Dense fog will reduce visibility to 1/4 NM or less.
Where:
All Open Waters of Lake Michigan.
All Open Waters of Lake Michigan.
When:
Until 7 PM CDT this evening.
Until 7 PM CDT this evening.
Impacts:
Low visibility will make navigation difficult.
Low visibility will make navigation difficult.
Instructions:
If you must navigate, proceed with caution. Use proper fog
signals. Make sure all running lights are on. Remember to use
your radar and compass.
If you must navigate, proceed with caution. Use proper fog
signals. Make sure all running lights are on. Remember to use
your radar and compass.
Areas Impacted:
Lake Michigan Michigan City IN to St. Joseph MI 5 NM offshore to mid-line of lake.
Lake Michigan from Seul Choix Point to Rock Island Passage 5NM offshore to Mid Lake
Lake Michigan South of a line from Seul Choix Point to the Mackinac Bridge and North of a line from Charlevoix MI to South Fox Island 5NM offshore
Lake Michigan from Charlevoix to Point Betsie MI 5NM Offshore to mid lake
Lake Michigan from Point Betsie to Manistee MI 5NM offshore to Mid Lake
Lake Michigan from Rock Island Passage to Sturgeon Bay WI 5NM offshore to mid lake
Lake Michigan from Sturgeon Bay to Two Rivers WI 5NM offshore to Mid Lake
Lake Michigan from Two Rivers to Sheboygan WI 5NM offshore to Mid Lake
Lake Michigan from Sheboygan to Port Washington WI 5NM offshore to Mid Lake
Lake Michigan from Port Washington to North Point Light WI 5NM offshore to Mid Lake
Lake Michigan from North Point Light to Wind Point WI 5NM offshore to Mid Lake
Lake Michigan from Wind Point WI to Winthrop Harbor IL 5NM offshore to Mid Lake
Lake Michigan from Winthrop Harbor to Wilmette Harbor IL 5NM offshore to Mid Lake
Lake Michigan from Wilmette Harbor to Michigan City in 5NM offshore to Mid Lake
Lake Michigan from Pentwater to Manistee MI 5NM offshore to Mid Lake
Lake Michigan from Whitehall to Pentwater MI 5NM offshore to Mid Lake
Lake Michigan from Grand Haven to Whitehall MI 5NM offshore to Mid Lake
Lake Michigan from Holland to Grand Haven MI 5NM offshore to Mid Lake
Lake Michigan from South Haven to Holland MI 5NM offshore to Mid lake
Lake Michigan from St Joseph to South Haven MI 5NM offshore to Mid Lake