Small Craft Advisory 21, NWS Grand Rapids, MI

921 
WHUS73 KGRR 080245
MWWGRR

URGENT - MARINE WEATHER MESSAGE
National Weather Service Grand Rapids MI
1045 PM EDT Tue Apr 7 2026

LMZ846>849-081045-
/O.CON.KGRR.GL.W.0008.260408T1500Z-260409T1500Z/
Holland to Grand Haven MI-Grand Haven to Whitehall MI-
Whitehall to Pentwater MI-Pentwater to Manistee MI-
1045 PM EDT Tue Apr 7 2026

...GALE WARNING REMAINS IN EFFECT FROM 11 AM WEDNESDAY TO 11 AM
EDT THURSDAY...

* WHAT...South winds 20 to 30 knots with gusts up to 40 knots 
  and waves 5 to 8 feet expected.

* WHERE...Holland to Manistee.

* WHEN...From 11 AM Wednesday to 11 AM EDT Thursday.

* IMPACTS...Strong winds will cause hazardous waves which could 
  capsize or damage vessels and reduce visibility.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Mariners should alter plans to avoid these hazardous conditions.
Remain in port, seek safe harbor, alter course, and/or secure the
vessel for hazardous conditions.

&&

$$

LMZ844-845-081045-
/O.CON.KGRR.SC.Y.0021.260408T1500Z-260409T1500Z/
St Joseph to South Haven MI-South Haven to Holland MI-
1045 PM EDT Tue Apr 7 2026

...SMALL CRAFT ADVISORY REMAINS IN EFFECT FROM 11 AM WEDNESDAY TO
11 AM EDT THURSDAY...

* WHAT...South winds 15 to 25 knots with gusts up to 30 knots 
  and waves 2 to 5 feet expected.

* WHERE...St Joseph to Holland.

* WHEN...From 11 AM Wednesday to 11 AM EDT Thursday.

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

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

$$

351 
WHUS73 KGRR 080712
MWWGRR

URGENT - MARINE WEATHER MESSAGE
National Weather Service Grand Rapids MI
312 AM EDT Wed Apr 8 2026

LMZ846>849-081515-
/O.CON.KGRR.GL.W.0008.260408T1500Z-260409T1500Z/
Holland to Grand Haven MI-Grand Haven to Whitehall MI-
Whitehall to Pentwater MI-Pentwater to Manistee MI-
312 AM EDT Wed Apr 8 2026

...GALE WARNING REMAINS IN EFFECT FROM 11 AM THIS MORNING TO
11 AM EDT THURSDAY...

* WHAT...South winds 20 to 30 knots with gusts up to 40 knots 
  and waves 5 to 8 feet expected.

* WHERE...Holland to Manistee.

* WHEN...From 11 AM this morning to 11 AM EDT Thursday.

* IMPACTS...Strong winds will cause hazardous waves which could 
  capsize or damage vessels and reduce visibility.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Mariners should alter plans to avoid these hazardous conditions.
Remain in port, seek safe harbor, alter course, and/or secure the
vessel for hazardous conditions.

&&

$$

LMZ844-845-081515-
/O.CON.KGRR.SC.Y.0021.260408T1500Z-260409T1500Z/
St Joseph to South Haven MI-South Haven to Holland MI-
312 AM EDT Wed Apr 8 2026

...SMALL CRAFT ADVISORY REMAINS IN EFFECT FROM 11 AM THIS MORNING
TO 11 AM EDT THURSDAY...

* WHAT...South winds 15 to 25 knots with gusts up to 30 knots and
  waves 2 to 5 feet expected.

* WHERE...St Joseph to Holland.

* WHEN...From 11 AM this morning to 11 AM EDT Thursday.

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

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

$$

162 
WHUS73 KGRR 081518
MWWGRR

URGENT - MARINE WEATHER MESSAGE
National Weather Service Grand Rapids MI
1118 AM EDT Wed Apr 8 2026

LMZ846>849-082330-
/O.CON.KGRR.GL.W.0008.000000T0000Z-260409T1500Z/
Holland to Grand Haven MI-Grand Haven to Whitehall MI-
Whitehall to Pentwater MI-Pentwater to Manistee MI-
1118 AM EDT Wed Apr 8 2026

...GALE WARNING REMAINS IN EFFECT UNTIL 11 AM EDT THURSDAY...

* WHAT...South winds 20 to 30 knots with gusts up to 40 knots 
  and waves 6 to 9 feet.

* WHERE...Holland to Manistee.

* WHEN...Until 11 AM EDT Thursday.

* IMPACTS...Strong winds will cause hazardous waves which could 
  capsize or damage vessels and reduce visibility.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Mariners should alter plans to avoid these hazardous conditions.
Remain in port, seek safe harbor, alter course, and/or secure the
vessel for hazardous conditions.

&&

$$

LMZ844-845-082330-
/O.CON.KGRR.SC.Y.0021.000000T0000Z-260409T1500Z/
St Joseph to South Haven MI-South Haven to Holland MI-
1118 AM EDT Wed Apr 8 2026

...SMALL CRAFT ADVISORY REMAINS IN EFFECT UNTIL 11 AM EDT
THURSDAY...

* WHAT...South winds 15 to 25 knots with gusts up to 30 knots 
  and waves 2 to 5 feet.

* WHERE...St Joseph to Holland.

* WHEN...Until 11 AM EDT Thursday.

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

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

$$

478 
WHUS73 KGRR 081801
MWWGRR

URGENT - MARINE WEATHER MESSAGE
National Weather Service Grand Rapids MI
201 PM EDT Wed Apr 8 2026

LMZ846>849-090215-
/O.CON.KGRR.GL.W.0008.000000T0000Z-260409T1500Z/
Holland to Grand Haven MI-Grand Haven to Whitehall MI-
Whitehall to Pentwater MI-Pentwater to Manistee MI-
201 PM EDT Wed Apr 8 2026

...GALE WARNING REMAINS IN EFFECT UNTIL 11 AM EDT THURSDAY...

* WHAT...South winds 20 to 30 knots with gusts up to 40 knots 
  and waves 6 to 9 feet.

* WHERE...Holland to Manistee.

* WHEN...Until 11 AM EDT Thursday.

* IMPACTS...Strong winds will cause hazardous waves which could 
  capsize or damage vessels and reduce visibility.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Mariners should alter plans to avoid these hazardous conditions.
Remain in port, seek safe harbor, alter course, and/or secure the
vessel for hazardous conditions.

&&

$$

LMZ844-845-090215-
/O.CON.KGRR.SC.Y.0021.000000T0000Z-260409T1500Z/
St Joseph to South Haven MI-South Haven to Holland MI-
201 PM EDT Wed Apr 8 2026

...SMALL CRAFT ADVISORY REMAINS IN EFFECT UNTIL 11 AM EDT
THURSDAY...

* WHAT...South winds 15 to 25 knots with gusts up to 30 knots 
  and waves 2 to 5 feet.

* WHERE...St Joseph to Holland.

* WHEN...Until 11 AM EDT Thursday.

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

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

$$

147 
WHUS73 KGRR 090154
MWWGRR

URGENT - MARINE WEATHER MESSAGE
National Weather Service Grand Rapids MI
954 PM EDT Wed Apr 8 2026

LMZ846>849-091000-
/O.CON.KGRR.GL.W.0008.000000T0000Z-260409T1500Z/
Holland to Grand Haven MI-Grand Haven to Whitehall MI-
Whitehall to Pentwater MI-Pentwater to Manistee MI-
954 PM EDT Wed Apr 8 2026

...GALE WARNING REMAINS IN EFFECT UNTIL 11 AM EDT THURSDAY...

* WHAT...Southwest gales to 35 knots and waves 5 to 8 feet.

* WHERE...Holland to Manistee.

* WHEN...Until 11 AM EDT Thursday.

* IMPACTS...Strong winds will cause hazardous waves which could 
  capsize or damage vessels and reduce visibility.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Mariners should alter plans to avoid these hazardous conditions.
Remain in port, seek safe harbor, alter course, and/or secure the
vessel for hazardous conditions.

&&

$$

LMZ844-845-091000-
/O.CON.KGRR.SC.Y.0021.000000T0000Z-260409T1500Z/
St Joseph to South Haven MI-South Haven to Holland MI-
954 PM EDT Wed Apr 8 2026

...SMALL CRAFT ADVISORY REMAINS IN EFFECT UNTIL 11 AM EDT
THURSDAY...

* WHAT...Southwest winds 10 to 20 knots with gusts up to 30 
  knots and waves 2 to 5 feet.

* WHERE...St Joseph to Holland.

* WHEN...Until 11 AM EDT Thursday.

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

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

$$

485 
WHUS73 KGRR 090736
MWWGRR

URGENT - MARINE WEATHER MESSAGE
National Weather Service Grand Rapids MI
336 AM EDT Thu Apr 9 2026

LMZ846>849-091500-
/O.CON.KGRR.GL.W.0008.000000T0000Z-260409T1500Z/
Holland to Grand Haven MI-Grand Haven to Whitehall MI-
Whitehall to Pentwater MI-Pentwater to Manistee MI-
336 AM EDT Thu Apr 9 2026

...GALE WARNING REMAINS IN EFFECT UNTIL 11 AM EDT THIS MORNING...

* WHAT...Southwest gales to 35 knots and waves 5 to 8 feet.

* WHERE...Holland to Manistee.

* WHEN...Until 11 AM EDT Thursday.

* IMPACTS...Strong winds will cause hazardous waves which could 
  capsize or damage vessels and reduce visibility.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Mariners should alter plans to avoid these hazardous conditions.
Remain in port, seek safe harbor, alter course, and/or secure the
vessel for hazardous conditions.

&&

$$

LMZ844-845-091500-
/O.CON.KGRR.SC.Y.0021.000000T0000Z-260409T1500Z/
St Joseph to South Haven MI-South Haven to Holland MI-
336 AM EDT Thu Apr 9 2026

...SMALL CRAFT ADVISORY REMAINS IN EFFECT UNTIL 11 AM EDT THIS
MORNING...

* WHAT...Southwest windsto 30 knots and waves 2 to 5 feet.

* WHERE...St Joseph to Holland.

* WHEN...Until 11 AM EDT Thursday.

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

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

$$

777 
WHUS73 KGRR 091224
MWWGRR

URGENT - MARINE WEATHER MESSAGE
National Weather Service Grand Rapids MI
824 AM EDT Thu Apr 9 2026

LMZ846>849-091330-
/O.CAN.KGRR.GL.W.0008.000000T0000Z-260409T1500Z/
Holland to Grand Haven MI-Grand Haven to Whitehall MI-
Whitehall to Pentwater MI-Pentwater to Manistee MI-
824 AM EDT Thu Apr 9 2026

...GALE WARNING IS CANCELLED...

Wind and waves are no longer hazardous to small craft.

$$

LMZ844-845-091330-
/O.CAN.KGRR.SC.Y.0021.000000T0000Z-260409T1500Z/
St Joseph to South Haven MI-South Haven to Holland MI-
824 AM EDT Thu Apr 9 2026

...SMALL CRAFT ADVISORY IS CANCELLED...

Wind and waves are no longer hazardous to small craft.

$$

Area Forecast Discussion
National Weather Service Grand Rapids MI
128 PM EDT Tue Apr 7 2026

.KEY MESSAGES...

- Mainly dry and cool through Wednesday

- Rain Thursday; Rain and Snow Friday

- Dry Saturday, then increasing rain chances through Monday

&&

.DISCUSSION...
Issued at 310 AM EDT Tue Apr 7 2026

- Mainly dry and cool through Wednesday

The cold pool aloft and northern branch of the jet are steadily
moving ENE away from the area this morning. The anti-cyclonic flow
ahead of the incoming upper ridge is bringing strong subsidence to
the area. This will lead to diminishing lake effect low cloud cover
currently across Northern Lower as it tries dropping down over the
area. Temperatures will remain quite cold by early April standards
as the northerly flow is continuing to advect cold and dry air from
Canada.

The ridge overhead early Wednesday should bring plenty of clear
skies by then, with maybe some high clouds advecting in later
Wednesday out ahead of the next incoming system. The far NW corner
of the forecast may see a sprinkle being on the eastern edge of the
stronger warm air advection, but dry low levels will really limit
rain chances at the sfc. The return flow from the south will bring
much more seasonable temperatures Wednesday with highs well into the
50s.

- Rain Thursday; Rain and Snow Friday

We see an abnormally strong upper low currently over British
Columbia that will be dropping ESE toward the area by Wednesday
night. As this system approaches, there is a period late Wednesday
and Wednesday night where it is able to directly tap some good and
deep moisture in the lower levels from the Gulf. We will see this
precipitation in the form of rain as 850 mb temperatures will be up
around +6 to +8C, and the moist axis is aimed toward the area. As
time passes into Thursday, the low level flow becomes oriented more
from the Southern Appalachians, so the moisture is limited from that
point on Thursday.

Thunder chances for our area seem a bit too low at this time to
include a mention in the forecast. Sfc based and elevated LI's are
all positive, so we will hold off for a thunder mention at this
time.

It seems that the front will mostly clear the area by Thursday
afternoon. This means that the moisture will be swept out, and we
could see some clearing take place Thursday mid-late afternoon as
high pressure builds in for a short period.

The front does not go far, as it drops only to Northern Indiana and
Ohio before stalling out as it becomes parallel to the upper flow.
It will be there for upper jet energy to act on it, and these
features phase on Friday. In addition to the strong dynamics, the
low level flow will be more favorable to draw moisture northward out
of the Gulf, and up and over the front.

There is good agreement and consensus on bringing additional
precipitation with this setup. There is a bit of uncertainty yet
with this period, as there is some disagreement on p-type. The flow
from the NE in the lower levels will feed cool and dry air over the
area just north of the front. Therefore, if the air is cool enough,
it would fall as some snow of the far northern periphery. This is
one thing we will need to continue to monitor.

- Dry Saturday, then increasing rain chances through Monday

Upper and sfc ridging will help to sweep the front and moisture well
out of the area by Saturday. The air will not be much cooler than
Friday when the cool air is advecting in from the NE.

We will see quite a change then take place by Sunday that the models
and ensembles have been handling well for the last few days. A long
wave trough will move over much of the Western U.S. by later
Saturday and Sunday. This will bring a deep S to SW flow aloft over
the area once again. Initially we may see the benefits of this being
a significant warm up for Sunday as 850 mb temps warm into the lower
teens C. The moist axis looks to stay west of the area for the day,
allowing for a warm and mostly dry Sunday.

This will change on Monday as the front inches closer, and the deep
moist axis moves overhead. It will stay warm, but the day will
likely be much more wet. This will be the beginning of yet another
wet period, similar to what we saw last week. This could be
concerning as area rivers and streams will not have had a chance to
totally recover from the high to flooding flows currently going on.

&&

.AVIATION /18Z TAFS THROUGH 18Z WEDNESDAY/...
Issued at 126 PM EDT Tue Apr 7 2026

Skies are clear across the region as high pressure remains
overhead. We'll see some mid and high clouds develop Wednesday
morning as the next system approaches, however, ceilings will
remain aoa 12k ft.

&&

.MARINE...
Issued at 310 AM EDT Tue Apr 7 2026

We will be issuing a Gale Watch for areas near Holland and northward
for late Wednesday and Wednesday night. The current Small Craft
Advisory remains in effect with no changes at this time.

We are at the tail end of the ongoing Small Craft Advisory. High
pressure is building in over the area, and the pressure gradient
between the departing low and the incoming high is just about past
the area.

Winds will start to increase on the backside of the sfc ridge later
Tuesday night and Wednesday. The core of wind with this event will
be late Wednesday and Wednesday night, which is when we have the
Gale Watch. Gales look likely for that, and we will likely need a
Small Craft Advisory leading up to the Gale event.

&&

.HYDROLOGY...
Issued at 251 PM EDT Mon Apr 6 2026

No significant rain is expected until Wednesday night and Thursday
when one quarter to half an inch is forecast across the Muskegon
Basin with lesser amounts to the south across the Grand and
Kalamazoo river basins. Until then, crests will continue moving
downstream across the rivers.

&&

.GRR WATCHES/WARNINGS/ADVISORIES...
MI...None.
MARINE...Gale Warning from 11 AM Wednesday to 11 AM EDT Thursday for
     LMZ846>849.

&&

DISCUSSION...NJJ
AVIATION...04
MARINE...NJJ
HYDROLOGY...Ostuno

Hazardous Weather Outlook
National Weather Service Grand Rapids MI
448 AM EDT Tue Apr 7 2026

MIZ037>040-043>046-050>052-056>059-064>067-071>074-080900-
Mason-Lake-Osceola-Clare-Oceana-Newaygo-Mecosta-Isabella-Muskegon-
Montcalm-Gratiot-Ottawa-Kent-Ionia-Clinton-Allegan-Barry-Eaton-
Ingham-Van Buren-Kalamazoo-Calhoun-Jackson-
448 AM EDT Tue Apr 7 2026

This hazardous weather outlook is for portions of southwest Lower
Michigan.

.DAY ONE...Today and Tonight

Area rivers will remain high due to the rain that fell over the
past weekend across the area.

.DAYS TWO THROUGH SEVEN...Wednesday through Monday

Area rivers will remain high much of the week.

.SPOTTER INFORMATION STATEMENT...

Spotter activation will not be needed.

LMZ844>849-080900-
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-
448 AM EDT Tue Apr 7 2026

This hazardous weather outlook is for the nearshore waters from
St Joseph to Manistee.

.DAY ONE...Today and Tonight

Conditions hazardous to Small Craft early this morning will
improve by afternoon. Winds and waves will then increase once
again beginning later tonight.

.DAYS TWO THROUGH SEVEN...Wednesday through Monday

Winds and waves will create hazardous conditions for Small Craft
Wednesday through Thursday night. Gales are likely late Wednesday
and Wednesday night.

.SPOTTER INFORMATION STATEMENT...

Spotter activation will not be needed.