Marine Weather and Tide Forecast for Holland, MI

DISCUSSION
Issued at 343 PM EDT Thu Jun 19 2025

- The Heat is On

The main story of the 7 day forecast is certainly the heat. Normal highs this time of year are around 80 with normal lows around 60.
We will see highs and lows 10+ degrees above normal much of the next week. The warmest period will be from Saturday through Monday. 850mb temperatures soar to +21 to +24 degrees C which normally pushes high temperatures into the 90s and this event looks to do just that. Really we are looking at a 4 day stretch from Saturday through Tuesday where highs will be at least around 90. Overnight low temperatures will be above 70 so there will be little relief overnight for those without air conditioning. The area of most concern is the southern half of our forecast area from Muskegon to Alma and points southward on Saturday, Sunday and Monday when heat index values will be around 100. We are most likely looking at the need for Heat Advisories as we go forward into the weekend and early next week. Even though we cool just a bit into the mid week, we are still looking at warm above normal temperatures Tuesday through next Thursday. Highs during that period will "cool" from the lower 90s to the middle to upper 80s.
Bottom line, the heat is on and those wanting hot summer temperatures...they have arrived! This is the time to begin messaging heat safety tips.

- Periodic Storm Chances through Saturday morning

We have chances for some showers and thunderstorms beginning this evening as some activity tries to work across Central Lake Michigan. These storms will have to survive a lake trip where this time of year the storms will ingest the cooler more stable air.
For this reason we only have isolated/20 pct chances for precipitation up near Big and Little Sable Points.

Both late tonight/Friday morning and again late Friday night/Saturday morning we have chances for ridge riding shower and thunderstorm activity. The convection will be associated with a warm front nearby stretched out from northwest to southeast on the edge of the heat dome. Both periods the nocturnal low level jet veers and bends into our area. We have chance pops tonight around 30-40 pct up towards Ludington with much higher pops Saturday morning (60 pct) across Central Lower.

- Additional Shower and Thunderstorm Chances Next Week

As we head into the middle of next week, Tuesday through Thursday, we should see an increase in shower and thunderstorm chances once again as the strong ridge over the weekend is flattened some into more of a zonal flow. A boundary will hang up over Lower Michigan due to it becoming parallel with the upper flow resulting in shower and thunderstorm chances.

AVIATION /00Z TAFS THROUGH 00Z FRIDAY/
Issued at 743 PM EDT Thu Jun 19 2025

A line of showers and storms moved across the Lake. As they moved inland however, the storms weakened. Any other storm development has been east of TAF sites. For any lingering precip have put VCSH for MKG and GRR. Otherwise, expecting a primarily dry forecast.
While the chance remains low, some models are bringing in some low level moisture overnight especially on the lakeshore. That would primarily mean MVFR vsbys. If that were to occur it would only affect MKG between 09Z to 13Z. However, since there is a low chance have left any mentions of reducing vsbys out of the TAF.



MARINE
Issued at 343 PM EDT Thu Jun 19 2025

Winds and waves have calmed as the system has moved to the east.
Overall winds and waves will remain calm through tomorrow. Southerly flow will build tomorrow evening. That strong flow should allow for winds and waves to become hazardous to small craft. Waves could potentially continue to build, especially Grand Haven northward, through Saturday. Waves hazardous to small craft and beach goers could potentially continue through the weekend.

GRR WATCHES/WARNINGS/ADVISORIES
MI...None.
MARINE...None.