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LMZ846 Holland To Grand Haven Mi- 405 Pm Est Thu Dec 7 2023
Through early evening..South winds 10 to 15 knots. Mostly Sunny. Waves 2 to 4 feet.
Tonight..South winds 15 to 25 knots. Partly cloudy. Waves 2 to 3 feet building to 4 to 6 feet toward daybreak.
Friday..South winds 15 to 25 knots. Partly Sunny. Waves 6 to 8 feet.
Friday night..South winds to 30 knots. Rain showers. Waves 4 to 6 feet subsiding to 2 to 4 feet toward daybreak.
Saturday..South winds to 30 knots veering southwest. Rain showers likely. Waves 5 to 7 feet.
Saturday night..West winds to 30 knots veering northwest toward daybreak. Mostly cloudy with a chance of rain showers. Waves 4 to 6 feet.
Sunday..Northwest winds to 30 knots. Cloudy with a chance of rain and snow showers. Waves 5 to 7 feet.
Monday..West winds 15 to 20 knots backing southwest late in the day. Partly Sunny. Waves 2 to 4 feet.
Tuesday..West winds 20 to 25 knots. Partly Sunny. Waves 4 to 6 feet.

LMZ800
No data

FXUS63 KGRR 072009 AFDGRR

Area Forecast Discussion National Weather Service Grand Rapids MI Issued by National Weather Service Detroit/Pontiac MI 309 PM EST Thu Dec 7 2023

LATEST UPDATE...
Short Term/Long Term/Marine

SHORT TERM
(This evening through Friday night)
Issued at 309 PM EST Thu Dec 7 2023

Lingering plume of lake augmented clouds across Ottawa and central Kent counties is finally mixing out. Skies will be rather clear tonight before expanding high clouds filter in overnight. Increasing boundary layer moisture across Kansas and Missouri will overspread the area in the morning. There may be an additional slug lake moisture scraped on the way in to make for more clouds. Winds will get gusty from the south through the morning as the warm front clears the area. Temperatures will climb into the 50s, especially outside the lake shadow. Moisture depth will be limited as far as producing shower activity.

LONG TERM
(Saturday through Thursday)
Issued at 309 PM EST Thu Dec 7 2023

Sharp ridging aloft will traverse the region through Friday. The broad trough over the western CONUS will compress in wavelength as embedded synoptic-scale features superpose while the strong jet over the Southwest CONUS drives eastward. Wave phase will stay out of alignment enough to maintain positive tilt through Sunday. As the jet exits the base of the trough early Saturday - surface cyclone development will occur near Saint Louis. The low will track through Chicagoland to the Straits. The slug of precipitation appears closely ties to the surface low. Appears that showers will be likely with the passage of the system during the day Saturday.

The primary surge of Gulf moisture will be east of the region on Sunday. As the upper trough swings through, cold air will filter into the region. The airmass will be cold enough during the day Sunday to initiate some lake-effect activity in the north/northwest flow. The depth of cold air will be appreciable - but rather warm for efficient snow production. The depth decreases rather aggressively by late Sunday, which will cause a rather quick decline in lake-effect Sunday night.

The cool start to the week will not last very long. A dry pattern appears in the offing with temps rebounding to above normal once again through the middle to end of next week.



AVIATION
(For the 18Z TAFS through 18Z Friday afternoon)
Issued at 1200 PM EST Thu Dec 7 2023

Enhanced MVFR cloud plume emerged from GRR west to the lake shore this morning. Clouds are tied to some enhanced lake augmentation to the surface layer moisture. Expectations are for this cloud field to persist for a couple more hours until entrainment can thin and scatter it. Otherwise, modest southwest flow will hold on this afternoon. Winds will quickly back to south/southeasterly after sunset as the surface warm front encroaches overnight.

Friday will be characterized by some gusty south/southwest flow coupled with increasing boundary layer moisture. Additional lake boost is anticipated to establish a ceiling at GRR and MKG during the morning - with scattered clouds elsewhere.

MARINE
Issued at 309 PM EST Thu Dec 7 2023

Winds and waves have settled down for the day. South flow will be on the increase late tonight as a warm front lifts into the region. The gusty flow will set up waves in excess of 5 feet through the day.

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

LM...Small Craft Advisory from 4 AM to 7 PM EST Friday for LMZ844>846.
Small Craft Advisory from 4 AM Friday to 1 AM EST Saturday for LMZ847>849.

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