Severe Thunderstorm Watch
SEVERE THUNDERSTORM WATCH OUTLINE UPDATE FOR WS 610
NWS STORM PREDICTION CENTER NORMAN OK
255 PM CDT FRI AUG 21 2026
SEVERE THUNDERSTORM WATCH 610 IS IN EFFECT UNTIL 1000 PM CDT
FOR THE FOLLOWING LOCATIONS
LMZ740-741-742-743-744-777-779-220300-
/O.NEW.KWNS.SV.A.0610.260821T1955Z-260822T0300Z/
CW
. ADJACENT COASTAL WATERS INCLUDED ARE
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
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
$$
ATTN...WFO...ARX...LOT...MKX...ILX...DVN...
Small Craft Advisory
URGENT - MARINE WEATHER MESSAGE
National Weather Service Northern Indiana
224 PM EDT Fri Aug 21 2026
LMZ043-046-220230-
/O.NEW.KIWX.SC.Y.0055.260822T1500Z-260823T0300Z/
New Buffalo MI to St Joseph MI-Michigan City IN to New Buffalo MI-
224 PM EDT Fri Aug 21 2026
...SMALL CRAFT ADVISORY IN EFFECT FROM 11 AM TO 11 PM EDT
SATURDAY...
* WHAT...Waves 3 to 5 feet expected. Northwest winds 15 to 20 kts
with gusts as high as 25 kts.
* WHERE...Michigan City IN to St Joseph MI.
* WHEN...From 11 AM to 11 PM EDT Saturday.
* IMPACTS...Conditions will be hazardous to small craft.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Inexperienced mariners, especially those operating smaller
vessels, should avoid navigating in hazardous conditions.
&&
$$
URGENT - MARINE WEATHER MESSAGE
National Weather Service Grand Rapids MI
220 PM EDT Fri Aug 21 2026
LMZ844>847-220300-
/O.NEW.KGRR.SC.Y.0060.260822T1200Z-260824T0300Z/
St Joseph to South Haven MI-South Haven to Holland MI-
Holland to Grand Haven MI-Grand Haven to Whitehall MI-
220 PM EDT Fri Aug 21 2026
...SMALL CRAFT ADVISORY IN EFFECT FROM 8 AM SATURDAY TO 11 PM EDT
SUNDAY...
* WHAT...Northwest winds 15 to 25 knots with gusts up to 30
knots and waves 3 to 6 feet expected.
* WHERE...St Joseph to Whitehall.
* WHEN...From 8 AM Saturday to 11 PM EDT Sunday.
* IMPACTS...Conditions will be hazardous to small craft.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Inexperienced mariners, especially those operating smaller
vessels, should avoid navigating in hazardous conditions.
&&
$$
URGENT - MARINE WEATHER MESSAGE
National Weather Service Grand Rapids MI
220 PM EDT Fri Aug 21 2026
LMZ848-849-220300-
/O.CON.KGRR.SC.Y.0059.000000T0000Z-260822T0000Z/
/O.NEW.KGRR.SC.Y.0060.260822T1200Z-260824T0300Z/
Whitehall to Pentwater MI-Pentwater to Manistee MI-
220 PM EDT Fri Aug 21 2026
...SMALL CRAFT ADVISORY REMAINS IN EFFECT UNTIL 8 PM EDT THIS
EVENING...
...SMALL CRAFT ADVISORY IN EFFECT FROM 8 AM SATURDAY TO 11 PM EDT
SUNDAY...
* WHAT...For today, south winds 10 to 15 knots with gusts up to 25
knots and waves 2 to 4 feet. For Saturday and Sunday, north
winds 10 to 20 knots with gusts up to 30 knots and waves 3 to 6
feet expected.
* WHERE...Whitehall to Manistee.
* WHEN...Until 8 PM EDT this evening. Then, from 8 AM Saturday to
11 PM EDT Sunday.
* IMPACTS...Conditions will be hazardous to small craft.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Inexperienced mariners, especially those operating smaller
vessels, should avoid navigating in hazardous conditions.
&&
$$
URGENT - MARINE WEATHER MESSAGE
National Weather Service Gaylord MI
208 PM EDT Fri Aug 21 2026
LMZ323-341-342-344>346-220000-
/O.CON.KAPX.SC.Y.0070.000000T0000Z-260822T0000Z/
Grand Traverse Bay south of a line Grand Traverse Light to
Norwood MI-Seul Choix Point to 5NM West of Mackinac Bridge-
Norwood MI to 5NM West of Mackinac Bridge including Little
Traverse Bay-Sleeping Bear Point to Grand Traverse Light MI-
Point Betsie to Sleeping Bear Point MI-
Manistee to Point Betsie MI-
208 PM EDT Fri Aug 21 2026
...SMALL CRAFT ADVISORY REMAINS IN EFFECT UNTIL 8 PM EDT THIS
EVENING...
* WHAT...Highest gusts up to 25 kts from the south and highest
waves around 4 feet.
* WHERE...Portions of Lake Michigan.
* WHEN...Until 8 PM EDT this evening.
* IMPACTS...Conditions will be hazardous to small craft.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Inexperienced mariners, especially those operating smaller
vessels, should avoid navigating in hazardous conditions.
&&
$$
Beach Hazards Statement
Coastal Hazard Message
National Weather Service Northern Indiana
223 PM EDT Fri Aug 21 2026
INZ103-MIZ177-277-220230-
/O.NEW.KIWX.BH.S.0010.260822T1500Z-260824T0300Z/
Northern La Porte-Northern Berrien-Southern Berrien-
223 PM EDT Fri Aug 21 2026 /123 PM CDT Fri Aug 21 2026/
...BEACH HAZARDS STATEMENT IN EFFECT FROM SATURDAY MORNING
THROUGH SUNDAY EVENING...
* WHAT...Dangerous swimming conditions expected. Waves 3 to 5
feet. Strong rip and structural currents expected.
* WHERE...In Indiana, Northern La Porte county. In Michigan,
Northern Berrien and Southern Berrien counties.
* WHEN...From Saturday morning through Sunday evening.
* IMPACTS...Strong currents can pull swimmers into deeper water
and high waves can sweep people off piers.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Remain out of the water to avoid hazardous swimming conditions.
Do not venture out on piers.
&&
$$
Coastal Hazard Message
National Weather Service Grand Rapids MI
220 PM EDT Fri Aug 21 2026
MIZ037-043-220300-
/O.NEW.KGRR.BH.S.0019.260822T1200Z-260824T0300Z/
/O.CON.KGRR.BH.S.0018.000000T0000Z-260822T0000Z/
Mason-Oceana-
220 PM EDT Fri Aug 21 2026
...BEACH HAZARDS STATEMENT REMAINS IN EFFECT UNTIL 8 PM EDT THIS
EVENING...
...BEACH HAZARDS STATEMENT IN EFFECT FROM SATURDAY MORNING
THROUGH SUNDAY EVENING...
* WHAT...High wave action, strong currents, and dangerous swimming
conditions expected. Piers may be swamped by waves.
* WHERE...Mason and Oceana counties.
* WHEN...Until 8 PM EDT this evening. Then, from Saturday morning
through Sunday evening.
* IMPACTS...Strong currents can pull swimmers into deeper water
and high waves can sweep people off piers.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Remain out of the water to avoid hazardous swimming conditions
and do not venture out on piers. Please check with your local
authorities on potential beach closures.
&&
$$
Coastal Hazard Message
National Weather Service Grand Rapids MI
220 PM EDT Fri Aug 21 2026
MIZ050-056-064-071-220300-
/O.NEW.KGRR.BH.S.0019.260822T1200Z-260824T0300Z/
Muskegon-Ottawa-Allegan-Van Buren-
220 PM EDT Fri Aug 21 2026
...BEACH HAZARDS STATEMENT IN EFFECT FROM SATURDAY MORNING
THROUGH SUNDAY EVENING...
* WHAT...High wave action, strong currents, and dangerous
swimming conditions expected. Piers may be heavily swamped by
waves.
* WHERE...Muskegon, Ottawa, Allegan and Van Buren counties.
* WHEN...From Saturday morning through Sunday evening.
* IMPACTS...Strong currents can pull swimmers into deeper water
and high waves can sweep people off piers.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Remain out of the water to avoid hazardous swimming conditions
and do not venture out on piers. Please check with your local
authorities on potential beach closures.
&&
$$
Hazardous Weather Outlook
Hazardous Weather Outlook
National Weather Service Milwaukee/Sullivan WI
212 PM CDT Fri Aug 21 2026
LMZ080-261-362-364-366-563-565-567-669-671-673-675-777-779-868-
870-872-874-876-878-221915-
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-
212 PM CDT Fri Aug 21 2026
This Hazardous Weather Outlook is for the open waters of Lake Michigan.
.DAY ONE...Tonight
Scattered storms expected. A few storms could be strong with gusty
winds.
.DAYS TWO THROUGH SEVEN...Saturday through Friday
Storm chances return Tuesday into Wednesday.
$$
www.weather.gov/mkx
Hazardous Weather Outlook
National Weather Service Detroit/Pontiac MI
450 AM EDT Fri Aug 21 2026
LCZ460-LEZ444-LHZ361>363-421-422-441>443-462>464-220900-
Lake St Clair-
Michigan Waters of Lake Erie from Detroit River to North Cape MI-
Lake Huron from 5NM east of Mackinac Bridge to Presque Isle Lt
beyond 5 NM off shore-
Lake Huron from Presque Isle Light to Sturgeon Point MI beyond 5NM
off shore-
Lake Huron from Sturgeon Point to Alabaster MI beyond 5NM off shore-
Outer Saginaw Bay SW of Alabaster to Port Austin MI to Inner Saginaw
Bay-Inner Saginaw Bay SW of Point Au Gres to Bay Port MI-
Port Austin to Harbor Beach MI-Harbor Beach to Port Sanilac MI-
Port Sanilac to Port Huron MI-
Lake Huron from Port Austin to Harbor Beach beyond 5NM Off Shore-
Lake Huron from Harbor Beach to Port Sanilac beyond 5NM Off Shore-
Lake Huron from Port Sanilac to Port Huron beyond 5NM Off Shore-
450 AM EDT Fri Aug 21 2026
This hazardous weather outlook is for portions of Lake Erie, Lake
Huron and Lake St Clair.
.DAY ONE...Today and Tonight
Scattered showers and isolated thunderstorms develop tonight.
Thunderstorms are not expected to reach severe intensity while moving
west to east around 15 knots.
.DAYS TWO THROUGH SEVEN...Saturday through Thursday
Showers and thunderstorms increase coverage Saturday as a cold front
moves through the region. An isolated thunderstorm could approach
severe intensity during the afternoon south of Harbor Beach. Damaging
wind near 50 knots is the primary hazard with a chance of small hail
and brief heavy rainfall as storms move west to east at 25 knots.
$$
You can obtain your latest National Weather Service forecasts online
at www.weather.gov/detroit.
BT
Hazardous Weather Outlook
National Weather Service Detroit/Pontiac MI
450 AM EDT Fri Aug 21 2026
MIZ047>049-053>055-060>063-068>070-075-076-082-083-220900-
Midland-Bay-Huron-Saginaw-Tuscola-Sanilac-Shiawassee-Genesee-Lapeer-
St. Clair-Livingston-Oakland-Macomb-Washtenaw-Wayne-Lenawee-Monroe-
450 AM EDT Fri Aug 21 2026
This hazardous weather outlook is for southeast Michigan.
.DAY ONE...Today and Tonight
Scattered showers and isolated thunderstorms develop tonight.
Thunderstorms are not expected to reach severe intensity while moving
west to east around 20 mph.
.DAYS TWO THROUGH SEVEN...Saturday through Thursday
Showers and thunderstorms increase coverage Saturday as a cold front
moves through the region. An isolated thunderstorm could approach
severe intensity during the afternoon with damaging wind near 60 mph
being the primary hazard. There is also a chance of small hail and
brief heavy rainfall as storms move west to east at 30 mph.
.SPOTTER INFORMATION STATEMENT...
Spotter activation will not be needed today and tonight.
$$
