Small Craft Advisory 21, NWS Detroit, MI

655 
WHUS73 KDTX 121359
MWWDTX

URGENT - MARINE WEATHER MESSAGE
National Weather Service Detroit/Pontiac MI
959 AM EDT Sun Apr 12 2026

LHZ443-130230-
/O.EXA.KDTX.SC.Y.0021.260413T0200Z-260413T1400Z/
Port Sanilac to Port Huron MI-
959 AM EDT Sun Apr 12 2026

...SMALL CRAFT ADVISORY IN EFFECT FROM 10 PM THIS EVENING TO
10 AM EDT MONDAY...

* WHAT...Expect sustained winds up to 21 knots from the 
  southwest with gusts up to 26 knots. The largest significant 
  waves will be 3 feet with a potential maximum wave height of 4 
  feet.

* WHERE...Port Sanilac to Port Huron MI.

* WHEN...The maximum winds are expected around 4 AM EDT Monday 
  with the largest waves expected around 3 AM EDT Monday.

* IMPACTS...Conditions will be hazardous to small craft.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Inexperienced mariners, especially those operating smaller
vessels, should avoid navigating in hazardous conditions.

&&

$$

LHZ442-130230-
/O.EXT.KDTX.SC.Y.0021.260412T1400Z-260413T1400Z/
Harbor Beach to Port Sanilac MI-
959 AM EDT Sun Apr 12 2026

...SMALL CRAFT ADVISORY NOW IN EFFECT UNTIL 10 AM EDT MONDAY...

* WHAT...Expect sustained winds up to 21 knots from the south 
  with gusts up to 28 knots. The largest significant waves will 
  be 4 feet with a potential maximum wave height of 5 feet.

* WHERE...Harbor Beach to Port Sanilac MI.

* WHEN...The maximum winds are expected around 2 AM EDT Monday 
  with the largest waves expected around 12 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.

&&

$$

LHZ441-130230-
/O.CON.KDTX.SC.Y.0021.260412T1400Z-260413T1400Z/
Port Austin to Harbor Beach MI-
959 AM EDT Sun Apr 12 2026

...SMALL CRAFT ADVISORY REMAINS IN EFFECT UNTIL 10 AM EDT
MONDAY...

* WHAT...Expect sustained winds up to 22 knots from the south 
  with gusts up to 29 knots. The largest significant waves will 
  be 4 feet with a potential maximum wave height of 5 feet.

* WHERE...Port Austin to Harbor Beach MI.

* WHEN...The maximum winds are expected around 1 AM EDT Monday 
  with the largest waves expected around 3 AM EDT Monday.

* IMPACTS...Conditions will be hazardous to small craft.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Inexperienced mariners, especially those operating smaller
vessels, should avoid navigating in hazardous conditions.

&&

$$

LHZ421-422-130230-
/O.CON.KDTX.SC.Y.0021.260413T0200Z-260413T1400Z/
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-
959 AM EDT Sun Apr 12 2026

...SMALL CRAFT ADVISORY REMAINS IN EFFECT FROM 10 PM THIS EVENING
TO 10 AM EDT MONDAY...

* WHAT...Expect sustained winds up to 27 knots from the 
  southwest with gusts up to 32 knots. The largest significant 
  waves will be 5 feet with a potential maximum wave height of 7 
  feet.

* WHERE...Outer Saginaw Bay SW of Alabaster to Port Austin MI to 
  Inner Saginaw Bay and Inner Saginaw Bay SW of Point Au Gres to 
  Bay Port MI.

* WHEN...The maximum winds are expected around 1 AM EDT Monday 
  with the largest waves expected around 2 AM EDT Monday.

* IMPACTS...Conditions will be hazardous to small craft.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Inexperienced mariners, especially those operating smaller
vessels, should avoid navigating in hazardous conditions.

&&

$$

100 
WHUS73 KDTX 122000
MWWDTX

URGENT - MARINE WEATHER MESSAGE
National Weather Service Detroit/Pontiac MI
400 PM EDT Sun Apr 12 2026

LCZ460-LEZ444-130815-
/O.EXB.KDTX.SC.Y.0021.260413T0200Z-260413T1600Z/
Lake St Clair-
Michigan Waters of Lake Erie from Detroit River to North Cape MI-
400 PM EDT Sun Apr 12 2026

...SMALL CRAFT ADVISORY IN EFFECT FROM 10 PM THIS EVENING TO NOON
EDT MONDAY...

* WHAT...Expect sustained winds up to 20 knots from the southwest
  with gusts up to 30 knots. The largest significant waves will 
  be 3 feet with a potential maximum wave height of 4 feet.

* WHERE...In Lake St Clair, Lake St Clair. In Lake Erie, 
  Michigan Waters of Lake Erie from Detroit River to North Cape 
  MI.

* WHEN...The maximum winds are expected around 4 AM EDT Monday 
  with the largest waves expected around 6 AM EDT Monday.

* IMPACTS...Conditions will be hazardous to small craft.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Inexperienced mariners, especially those operating smaller
vessels, should avoid navigating in hazardous conditions.

&&

$$

LHZ421-422-130815-
/O.CON.KDTX.SC.Y.0021.260413T0200Z-260413T1400Z/
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-
400 PM EDT Sun Apr 12 2026

...SMALL CRAFT ADVISORY REMAINS IN EFFECT FROM 10 PM THIS EVENING
TO 10 AM EDT MONDAY...

* WHAT...Expect sustained winds up to 25 knots from the southwest
  with gusts up to 33 knots. The largest significant waves will 
  be 5 feet with a potential maximum wave height of 7 feet.

* WHERE...Outer Saginaw Bay SW of Alabaster to Port Austin MI to 
  Inner Saginaw Bay and Inner Saginaw Bay SW of Point Au Gres to 
  Bay Port MI.

* WHEN...The maximum winds are expected around 1 AM EDT Monday 
  with the largest waves expected around 2 AM EDT Monday.

* IMPACTS...Conditions will be hazardous to small craft.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Inexperienced mariners, especially those operating smaller
vessels, should avoid navigating in hazardous conditions.

&&

$$

LHZ441-130815-
/O.CON.KDTX.SC.Y.0021.000000T0000Z-260413T1400Z/
Port Austin to Harbor Beach MI-
400 PM EDT Sun Apr 12 2026

...SMALL CRAFT ADVISORY REMAINS IN EFFECT UNTIL 10 AM EDT
MONDAY...

* WHAT...Expect sustained winds up to 20 knots from the 
  southwest with gusts up to 30 knots. The largest significant 
  waves will be 4 feet with a potential maximum wave height of 5 
  feet.

* WHERE...Port Austin to Harbor Beach MI.

* WHEN...The maximum winds are expected around 1 AM EDT Monday 
  with the largest waves expected around 3 AM EDT Monday.

* IMPACTS...Conditions will be hazardous to small craft.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Inexperienced mariners, especially those operating smaller
vessels, should avoid navigating in hazardous conditions.

&&

$$

LHZ442-130815-
/O.CON.KDTX.SC.Y.0021.000000T0000Z-260413T1400Z/
Harbor Beach to Port Sanilac MI-
400 PM EDT Sun Apr 12 2026

...SMALL CRAFT ADVISORY REMAINS IN EFFECT UNTIL 10 AM EDT
MONDAY...

* WHAT...Expect sustained winds up to 20 knots from the southwest
  with gusts up to 30 knots. The largest significant waves will 
  be 4 feet with a potential maximum wave height of 5 feet.

* WHERE...Harbor Beach to Port Sanilac MI.

* WHEN...The maximum winds are expected around 1 AM EDT Monday 
  with the largest waves expected around 3 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.

&&

$$

LHZ443-130815-
/O.CON.KDTX.SC.Y.0021.260413T0200Z-260413T1400Z/
Port Sanilac to Port Huron MI-
400 PM EDT Sun Apr 12 2026

...SMALL CRAFT ADVISORY REMAINS IN EFFECT FROM 10 PM THIS EVENING
TO 10 AM EDT MONDAY...

* WHAT...Expect sustained winds up to 20 knots from the southwest
  with gusts up to 30 knots. The largest significant waves will 
  be 3 feet with a potential maximum wave height of 4 feet.

* WHERE...Port Sanilac to Port Huron MI.

* WHEN...The maximum winds are expected around 2 AM EDT Monday 
  with the largest waves expected around 3 AM EDT Monday.

* IMPACTS...Conditions will be hazardous to small craft.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Inexperienced mariners, especially those operating smaller
vessels, should avoid navigating in hazardous conditions.

&&

$$

KGK

717 
WHUS73 KDTX 130736
MWWDTX

URGENT - MARINE WEATHER MESSAGE
National Weather Service Detroit/Pontiac MI
336 AM EDT Mon Apr 13 2026

LHZ421-422-131400-
/O.CON.KDTX.SC.Y.0021.000000T0000Z-260413T1400Z/
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-
336 AM EDT Mon Apr 13 2026

...SMALL CRAFT ADVISORY REMAINS IN EFFECT UNTIL 10 AM EDT THIS
MORNING...

* WHAT...Expect sustained winds up to 25 knots from the 
  southwest with gusts up to 33 knots. The largest significant 
  waves will be 5 feet with a potential maximum wave height of 7 
  feet.

* WHERE...Outer Saginaw Bay SW of Alabaster to Port Austin MI to 
  Inner Saginaw Bay and Inner Saginaw Bay SW of Point Au Gres to 
  Bay Port MI.

* WHEN...The maximum winds are expected around 3 AM EDT Monday 
  with the largest waves expected around 3 AM EDT Monday.

* IMPACTS...Conditions will be hazardous to small craft.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Inexperienced mariners, especially those operating smaller
vessels, should avoid navigating in hazardous conditions.

&&

$$

LHZ441-131400-
/O.CON.KDTX.SC.Y.0021.000000T0000Z-260413T1400Z/
Port Austin to Harbor Beach MI-
336 AM EDT Mon Apr 13 2026

...SMALL CRAFT ADVISORY REMAINS IN EFFECT UNTIL 10 AM EDT THIS
MORNING...

* WHAT...Expect sustained winds up to 21 knots from the 
  southwest with gusts up to 29 knots. The largest significant 
  waves will be 4 feet with a potential maximum wave height of 5 
  feet.

* WHERE...Port Austin to Harbor Beach MI.

* WHEN...The maximum winds are expected around 3 AM EDT Monday 
  with the largest waves expected around 3 AM EDT Monday.

* IMPACTS...Conditions will be hazardous to small craft.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Inexperienced mariners, especially those operating smaller
vessels, should avoid navigating in hazardous conditions.

&&

$$

LHZ442-131400-
/O.CON.KDTX.SC.Y.0021.000000T0000Z-260413T1400Z/
Harbor Beach to Port Sanilac MI-
336 AM EDT Mon Apr 13 2026

...SMALL CRAFT ADVISORY REMAINS IN EFFECT UNTIL 10 AM EDT THIS
MORNING...

* WHAT...Expect sustained winds up to 21 knots from the 
  southwest with gusts up to 29 knots. The largest significant 
  waves will be 3 feet with a potential maximum wave height of 4 
  feet.

* WHERE...Harbor Beach to Port Sanilac MI.

* WHEN...The maximum winds are expected around 3 AM EDT Monday 
  with the largest waves expected around 5 AM EDT Monday.

* IMPACTS...Conditions will be hazardous to small craft.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Inexperienced mariners, especially those operating smaller
vessels, should avoid navigating in hazardous conditions.

&&

$$

LHZ443-131400-
/O.CON.KDTX.SC.Y.0021.000000T0000Z-260413T1400Z/
Port Sanilac to Port Huron MI-
336 AM EDT Mon Apr 13 2026

...SMALL CRAFT ADVISORY REMAINS IN EFFECT UNTIL 10 AM EDT THIS
MORNING...

* WHAT...Expect sustained winds up to 21 knots from the 
  southwest with gusts up to 27 knots. The largest significant 
  waves will be 3 feet with a potential maximum wave height of 4 
  feet.

* WHERE...Port Sanilac to Port Huron MI.

* WHEN...The maximum winds are expected around 4 AM EDT Monday 
  with the largest waves expected around 5 AM EDT Monday.

* IMPACTS...Conditions will be hazardous to small craft.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Inexperienced mariners, especially those operating smaller
vessels, should avoid navigating in hazardous conditions.

&&

$$

LCZ460-LEZ444-131600-
/O.CON.KDTX.SC.Y.0021.000000T0000Z-260413T1600Z/
Lake St Clair-
Michigan Waters of Lake Erie from Detroit River to North Cape MI-
336 AM EDT Mon Apr 13 2026

...SMALL CRAFT ADVISORY REMAINS IN EFFECT UNTIL NOON EDT TODAY...

* WHAT...Expect sustained winds up to 20 knots from the 
  southwest with gusts up to 30 knots. The largest significant 
  waves will be 3 feet with a potential maximum wave height of 4 
  feet.

* WHERE...In Lake St Clair, Lake St Clair. In Lake Erie, 
  Michigan Waters of Lake Erie from Detroit River to North Cape 
  MI.

* WHEN...The maximum winds are expected around 5 AM EDT Monday 
  with the largest waves expected around 6 AM EDT Monday.

* IMPACTS...Conditions will be hazardous to small craft.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Inexperienced mariners, especially those operating smaller
vessels, should avoid navigating in hazardous conditions.

&&

$$

Area Forecast Discussion
National Weather Service Detroit/Pontiac MI
738 PM EDT Sat Apr 11 2026

.KEY MESSAGES...

- Showers and a rumble of thunder late tonight and Sunday morning
precede the beginning of a new warming trend that holds for the bulk
of next week.

- Southwest wind gusting in the 30-40 mph range develops Sunday
afternoon helping to lift temperatures into the 70s.

- The pattern also becomes active for periods showers and
thunderstorms Sunday night through Wednesday.

- There is a Marginal Risk of severe thunderstorms Monday night and
Tuesday morning.

- Locally heavy rainfall potential also increases during the mid
week period.

&&

.AVIATION...

Surface high pressure will maintain a grip on the region bringing
quiet weather and VFR conditions through approximately 09z tonight.
Deep trough and low pressure over the northern Plains will then lead
to increasing southwesterly return flow late tonight and Sunday.
Models support steep surface to midlevel warm front aloft after 09z
yielding rapid thetae advection. Greatest convergence from low level
jet forcing is forecasted to impact portions of Lake Superior the
U.P. and northern Lake Huron delaying widespread support for ascent
here locally. Still expecting scattered activity as lead wing
isentropic ascent brings a potential mainly at MBS and FNT between
09-14z. A period of post warm front stratus (low confidence in
ceiling heights) is expected Sunday with mainly dry conditions
during the afternoon. Prevailing rain is expected sometime after 00z
4/13

For DTW... There is a very low chance for a brief rumble of elevated
thunder between 09-13z.

.DTW THRESHOLD PROBABILITIES...

*  Moderate for ceilings below 5000 ft tonight into Sunday.

* Low for thunderstorms Sunday morning, mainly between 09z and 13z.

&&

.PREV DISCUSSION...
Issued at 403 PM EDT Sat Apr 11 2026

DISCUSSION...

A postcard early to mid April Saturday afternoon is in progress as
high pressure controls conditions across SE Mi. It brings in a cool
and dry air mass that needs full sun to finish lifting high
temperatures just to near normal values in the lower to mid 50s.
Readings struggle to climb out of the 30s near Lake Huron with a
light onshore wind component setting up the standard cooler near the
Lakes exception.

Upstream observations across the Midwest this afternoon preview
changes that get underway in the Great Lakes tonight leading to
increasing coverage of rain showers toward sunrise. Progression of
larger scale 500 mb structures shifts surface high pressure quickly
to the Atlantic coast while the next low pressure center organizes
in the Dakotas. This low interacts with the stalled TN valley front
to rapidly accelerate moisture transport and isentropic ascent into
Lower Mi during the night, although greater coverage and intensity
of the resulting showers/rumble of thunder develops toward the
northern Great Lakes aligned with the low level jet maximum. Model
soundings also show dry air lingering below 850 mb that at least
pushes back against intensity toward the Tri Cities, and both
intensity and coverage toward metro Detroit. Near categorical POPs
along and north of M-46 are Ok for coverage while leaning toward the
lower end of the QPF guidance range, generally less than 0.25 inch
before the pattern shifts north by afternoon.

The rest of Sunday sees advancement of the warm sector into Lower Mi
during the afternoon and evening. The key here is the parent surface
low deepening well north toward the MN arrowhead which helps veer
the wind SW and drive the warm front northward against the cooler
Great Lakes aggregate. A stray shower or thunderstorm could
originate off the surface to mid level theta-e ridge nearby to the
west and affecting mainly the Tri Cities as model soundings indicate
some afternoon surface based CAPE. Scattered to broken clouds are
more likely over the rest of SE Mi making gusty SW wind and warm
temperatures the weather highlight. Hi-res model soundings support
HREF mean gusts potentially in the 30-40 mph range which helps lift
temperatures into the mid and upper 70s, and mainly from the I-69
corridor southward across metro Detroit.

For Sunday night into Monday, there appears to be a considerable MCV
signal in today's 12Z models originating from southern Plains
convection tonight and Sunday. A nocturnal convective increase is
expected over Lower Mi as the theta-e ridge crosses the area Sunday
night with a nocturnal/low level jet instability boost, however the
forecast leans away from the higher end QPF totals in range of
deterministic solutions. Blended guidance offering 0.25" to 0.5"
late Sunday night and Monday morning looks more reasonable compared
to totals exceeding 1 inch that rely on a mesoscale feature with low
predictability.

The air mass gains an even greater summer feel after showers/storms
decrease again Monday afternoon. Surface Td is projected to touch
the lower 60s while high temperatures range from around 70 Tri
Cities to mid/upper 70s metro Detroit. James Bay low pressure has a
cold front extending through Upper Mi which settles into central
Lower Mi Monday night and which is held in place by central Plains
low pressure. The warm and humid air mass over southern Lower Mi
then becomes capable of greater instability heading into Monday
night and Tuesday morning, the SPC Day 3 general thunder/marginal
risk time period tied to an area of slight risk in the Midwest. The
outlook carries low predictability due to the changing position of
the surface front and an expected transition from surface based to
elevated convection, both of which are a moving target at this point
in the forecast process.

The central Plains low pressure system keeps the mid week period
convectively active as well. This system presents a somewhat rare
Day 4 SPC outlook for Lower Mi is it tracks into northern Ontario
Tuesday and Wednesday. The trailing cold front lingers nearby during
the mid week period and also becomes the focus for heavy rainfall
potential. Otherwise, daytime temperatures hold in the 70s with no
real air mass change expected until closer to next weekend.

MARINE...

High pressure center exits Lower Michigan this evening, heading
toward the eastern Great Lakes overnight. Light and variable winds
near the anticyclone will begin to organize south-southeasterly,
amidst ensuing return flow. Gradual gradient constriction causes sub-
10 knot winds to rise tonight, exceeding 20 knots for the northern
half of Lake Huron by sunrise Sunday. Expect a more active week of
weather, beginning Sunday morning, as showers move in ahead of a
decaying line of nocturnal thunderstorms. Locally higher winds and
waves are possible as convection works across the Huron basin, but
lower column stability should limit overall gustiness. Potential
still exists for brief gusts to gales late Sunday into Monday as a
65+ knot low-level jet moves through the central Great Lakes. The
main area of concern will be Saginaw Bay given funneling southwest
flow, but it is possible that the stronger gusts extend further
south into Lake St. Clair and western Erie, and/or The Straits.
Several additional rounds of showers and thunderstorms are expected
throughout the week due to a series of troughs, low pressure
systems, and fronts.

&&

.DTX WATCHES/WARNINGS/ADVISORIES...
MI...None.
Lake Huron...None.
Lake St Clair...None.
Michigan waters of Lake Erie...None.
&&

AVIATION.....CB
DISCUSSION...BT
MARINE.......KGK

You can obtain your latest National Weather Service forecasts online
at www.weather.gov/detroit.

Hazardous Weather Outlook
National Weather Service Detroit/Pontiac MI
313 AM EDT Sat Apr 11 2026

MIZ047>049-053>055-060>063-068>070-075-076-082-083-120715-
Midland-Bay-Huron-Saginaw-Tuscola-Sanilac-Shiawassee-Genesee-Lapeer-
St. Clair-Livingston-Oakland-Macomb-Washtenaw-Wayne-Lenawee-Monroe-
313 AM EDT Sat Apr 11 2026

This hazardous weather outlook is for southeast Michigan.

.DAY ONE...Today and Tonight

No hazardous weather is expected at this time.

.DAYS TWO THROUGH SEVEN...Sunday through Friday

There is periodic chances of thunderstorms Sunday night through
Thursday, particularly during the afternoon hours and early evening
hours when thunderstorms could be strong.

.SPOTTER INFORMATION STATEMENT...

Spotter activation will not be needed today and tonight.

LCZ460-LEZ444-LHZ361>363-421-422-441>443-462>464-120715-
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-
313 AM EDT Sat Apr 11 2026

This hazardous weather outlook is for portions of Lake Erie, Lake
Huron and Lake St Clair.

.DAY ONE...Today and Tonight

No hazardous weather is expected at this time.

.DAYS TWO THROUGH SEVEN...Sunday through Friday

There is periodic chances of thunderstorms Sunday night through
Thursday, particularly during the afternoon hours and early evening
hours when thunderstorms could be strong.

.SPOTTER INFORMATION STATEMENT...

Spotter activation will not be needed today and tonight.

You can obtain your latest National Weather Service forecasts online
at www.weather.gov/detroit.

SC