Beach Hazards Statement 9, NWS Grand Rapids, MI

243 
WHUS43 KGRR 180630
CFWGRR

Coastal Hazard Message
National Weather Service Grand Rapids MI
230 AM EDT Thu Jun 18 2026

MIZ037-043-182000-
/O.EXA.KGRR.BH.S.0009.000000T0000Z-260618T2000Z/
Mason-Oceana-
230 AM EDT Thu Jun 18 2026

...BEACH HAZARDS STATEMENT IN EFFECT THROUGH THIS AFTERNOON...

* WHAT...High wave action, strong currents, and dangerous 
  swimming conditions expected. Piers may be heavily swamped by 
  waves.

* WHERE...Mason and Oceana counties.

* WHEN...Through 4 PM this afternoon.

* 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.

&&

$$

MIZ050-056-064-071-182000-
/O.EXT.KGRR.BH.S.0009.000000T0000Z-260618T2200Z/
Muskegon-Ottawa-Allegan-Van Buren-
230 AM EDT Thu Jun 18 2026

...BEACH HAZARDS STATEMENT NOW IN EFFECT THROUGH THIS AFTERNOON...

* 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...Through 6 PM this afternoon.

* 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.

&&

$$

953 
WHUS43 KGRR 181710
CFWGRR

Coastal Hazard Message
National Weather Service Grand Rapids MI
110 PM EDT Thu Jun 18 2026

MIZ050-056-064-071-182200-
/O.CON.KGRR.BH.S.0009.000000T0000Z-260618T2200Z/
Muskegon-Ottawa-Allegan-Van Buren-
110 PM EDT Thu Jun 18 2026

...BEACH HAZARDS STATEMENT REMAINS IN EFFECT UNTIL 6 PM EDT THIS
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...Until 6 PM EDT this 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.

&&

$$

MIZ037-043-182000-
/O.CON.KGRR.BH.S.0009.000000T0000Z-260618T2000Z/
Mason-Oceana-
110 PM EDT Thu Jun 18 2026

...BEACH HAZARDS STATEMENT REMAINS IN EFFECT UNTIL 4 PM EDT THIS
AFTERNOON...

* WHAT...High wave action, strong currents, and dangerous 
  swimming conditions expected. Piers may be heavily swamped by 
  waves.

* WHERE...Mason and Oceana counties.

* WHEN...Until 4 PM EDT this afternoon.

* 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.

&&

$$

Area Forecast Discussion
National Weather Service Grand Rapids MI
147 PM EDT Wed Jun 17 2026

.KEY MESSAGES...

- Chance of Severe Weather and Flooding in Southern Michigan

- Quieter Late Week Then Rain and Storms Possible Sunday

&&

.DISCUSSION...
Issued at 401 AM EDT Wed Jun 17 2026

- Chance of Severe Weather and Flooding in Southern Michigan

Anomalously deep low pressure cyclone for June, featuring two
pressure minima at or below 990 mb over Minnesota and southern
Lake Michigan, associated with a developing coupled upper-level
jet structure supporting significant upper-level divergence, will
provide dynamic weather to the Midwest today. A several hour
period of rain and thunderstorms between early-mid afternoon and
late evening will bring threats of strong winds and flooding.

Ahead of the low, a 60 to 70 knot 850 mb jet nosing into southern
lower Michigan late in the day will help supply moisture for a
large area of moderate to heavy rain. Initially rain-cooled air at
the surface over Lower Michigan will keep much of the severe and
tornado threat over Illinois and Indiana. However there are signs
of a weaker warm frontal boundary advecting into southwest lower
Michigan under destabilizing midlevels during the evening.
Vertical wind shear in the low and mid levels will become extreme
for a time this evening especially in southern Michigan between 5
and 9 PM, including sfc-1 km shear values around 50 knots in the
vicinity of an anticipated convective complex embedded within the
rain.

While surface parcels may not be outright convectively unstable
in the vicinity and north of I-94 this evening, a strong to severe
wind threat may still manifest in portions of the area. Some runs
of the HRRR and other HREF member models develop narrow bands of
wake-low enhanced southeast winds at times on the northwest edge
of the precipitation shield. Additionally, some runs of the HRRR
are producing small scale signatures of Gravity Wave Associated
Convection (GWAC) within one of the cells in southern Michigan
amid the complex, which if this does indeed occur, may entail an
increased hail threat despite meager elevated instability, and a
temporary wind direction reversal from southeast to northwest as
the stable air in the lower levels is lifted and dropped.

As far as precipitation, broadly 1 to 2 inches of rain is
supported in the larger mesoscale picture. However, depending on
the evolution of the smaller mesoscale convective features, a
narrower swath of 2 to 4, perhaps isolated 5 inches of rain may
fall in several hours. This is shown in the HREF's local
probability matched mean QPF. A flood watch has been issued to
cover this threat of flooding particularly for low-lying and urban
areas.

- Quieter Late Week Then Rain and Storms Possible Sunday

Thursday and Friday look cool and breezy with just very light and
scattered rain showers possible at times through Saturday. The
next shortwave trough ejecting from the western CONUS may develop
another surface low over the Plains to Midwest late in the
weekend. Depending on the track, another batch of heavy rain could
move in later on Sunday. There is still a wide distribution of
QPF amid the ensembles due to differences in the low's track, so
confidence in heavy rain or thunderstorms is not high for now.

&&

.AVIATION /18Z TAFS THROUGH 18Z THURSDAY/...
Issued at 138 PM EDT Wed Jun 17 2026

Prior to the development of thunderstorms this afternoon, we're
watching for the potential for wake low induced strong surface
winds to potentially develop. Winds have gusted to 48kts at MDW
and 55 kts over the lake. Not confident enough to put in the TAFs
yet, but we're aware of what's occurring west of here.

A deep low pressure system moving into the region will help to
generate strong to severe storms this afternoon. Strong winds are
the main threat. Additionally, once the precipitation diminishes
this evening, IFR cigs are expected to develop.

&&

.MARINE...
Issued at 452 AM EDT Wed Jun 17 2026

Small craft advisory is in effect beginning this afternoon as
southeast winds strengthen with gusts to 30 knots under rain and
thunderstorms through this evening. Gale force wind gusts from
the southeast could occur in the vicinity of some showers/storms
as indicated by high resolution models. Tonight into Thursday,
west winds will build hazardous waves, and a beach hazard
statement will be needed.

&&

.GRR WATCHES/WARNINGS/ADVISORIES...
MI...Beach Hazards Statement from late tonight through Thursday
     afternoon for MIZ050-056-064-071.
     Flood Watch through late tonight for MIZ064>067-071>074.
MARINE...Small Craft Advisory until 4 PM EDT Thursday for LMZ844>849.

&&

DISCUSSION...CAS
AVIATION...04
MARINE...CAS