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LMZ847 Grand Haven To Whitehall Mi- 405 Pm Est Sun Dec 10 2023
.small craft advisory in effect through Monday morning...
Through early evening..Northwest winds 15 to 20 knots. Cloudy with a slight chance of rain and snow showers. Waves 3 to 5 feet.
Tonight..Northwest winds 10 to 15 knots. Mostly cloudy with a chance of snow showers. Waves 2 to 4 feet.
Monday..Northwest winds 10 to 15 knots backing southwest 10 to 20 knots. Partly Sunny. Waves 1 to 3 feet.
Monday night..Southwest winds to 30 knots. Partly cloudy. Waves 3 to 5 feet building to 6 to 9 feet after midnight.
Tuesday..West gales to 35 knots. Mostly Sunny. Waves 7 to 10 feet.
Tuesday night..Northwest gales to 35 knots decreasing to 30 knots after midnight. Mostly clear. Waves 7 to 10 feet.
Wednesday..Northwest winds 20 to 25 knots. Sunny. Waves 5 to 7 feet subsiding to 2 to 4 feet late in the day.
Thursday..Southwest winds 20 to 25 knots. Sunny. Waves 4 to 6 feet.
Friday..Southwest winds 15 to 25 knots. Partly Sunny. Waves 4 to 6 feet.

LMZ800
No data

FXUS63 KGRR 102355 AFDGRR

Area Forecast Discussion National Weather Service Grand Rapids MI 655 PM EST Sun Dec 10 2023

LATEST UPDATE...
Aviation

SHORT TERM
(This evening through Monday night)
Issued at 240 PM EST Sun Dec 10 2023

- Showers continue through tonight

Rain and snow showers continue with the positive vorticity advection moving through paired with the northwest flow over Lake Michigan. Colder air will continue to advect over the area with temperatures dropping overnight into the mid 20s to low 30s. Any rain is expected to transition to snow this evening with showers focusing more along the lakeshore overnight with amounts under an inch. There is also a chance (20 to 30 percent) for a lake effect snow band to reach Clare County and bring some light accumulations under an inch this evening.

Drier air moves in for Monday and continues into Monday night with a brief shortwave ridge setting up. Lake effect clouds linger within the northwest to west flow, but the saturation doesn't look deep enough for any precipitation. This will keep high temperatures in the 30s for another gloomy day.

LONG TERM
(Tuesday through Sunday)
Issued at 240 PM EST Sun Dec 10 2023

Very little in the way of active weather is expected through the long term period of Tuesday through Sunday. Upper troughing will be in place to start the forecast period on Tuesday, replaced by zonal flow and much higher heights for the remainder of the period.
Temperatures through the long term will be above normal warming from the 30s on Tuesday to the 40s and near 50 by the end of the week and into next weekend.

As for any sensible weather there is a cold front that the models show passing through the area on Tuesday. Limited moisture means the front will pass through dry. This will be a time of windy conditions with southwest winds of 15 to 25 mph becoming northwest. Potential for some gusts to around 30 mph.

The only other time where there may be some precipitation will be out in the Friday time frame with another cold front. There is differences however in the operational models with the GFS pushing a cold front through while the ECWMF has ridging transitioning into a southwest flow. Bottom line, low confidence in this precipitation and left the small pops (20 pct) in our model blends in the forecast. So, we have a 20 pct chance of rain showers Friday into Friday night. Overall a very quiet forecast given the this time of year where we can be quite active.

AVIATION
(For the 00Z TAFS through 00Z Monday evening)
Issued at 655 PM EST Sun Dec 10 2023

In general tonight will feature MVFR cigs and scattered light snow or mixed rain and snow showers west of GRR and BTL (including MKG and AZO). VFR/dry weather is expected to prevail elsewhere/inland.
On Monday as northwest winds of 5 to 10 kts back to the west- southwest those lower MVFR cigs closer to the lakeshore may press a bit farther inland into GRR and BTL for a time in the morning.
Otherwise all areas should see cigs lift into VFR category after 18Z Monday as any remaining light lake effect precipitation ends.



MARINE
Issued at 240 PM EST Sun Dec 10 2023

Winds and waves gradually subside this evening with a lull in Small Craft conditions expected until Monday night when southwest winds and waves build again. Winds turn back to the northwest Tuesday with the front with Small Craft conditions lingering into Wednesday.



GRR WATCHES/WARNINGS/ADVISORIES
MI...None.
LM...Small Craft Advisory until 7 AM EST Monday for LMZ844>849.

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