Marine Forecasts

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7 Day Forecast for Marine Location Near Watersmeet, MI

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Area Discussion for - Green Bay, WI

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FXUS63 KGRB 110439 AFDGRB

Area Forecast Discussion National Weather Service Green Bay WI 1039 PM CST Tue Dec 10 2019

Updated aviation portion for 06Z TAF issuance

SYNOPSIS. Issued at 241 PM CST Tue Dec 10 2019

Cold tonight into Wednesday, then another round of snow late Wednesday night through Thursday.

The highly amplified upper pattern in place at the start of the period will quickly break down as a strong jet surges east from the Pacific. The resulting zonal flow won't last long either, as a trend toward a more slightly amplified but progressive pattern is expected next week.

The period will begin with well below normal temperatures, but readings will quickly rebound back close to seasonal normals by the end of the work week. Readings will drop off again after that, though likely not to current levels. There will be at least a couple rounds of precipitation during the period, but those probably won't be quite enough to bring totals for the 7 day period to normal.

SHORT TERM. Tonight and Wednesday Issued at 241 PM CST Tue Dec 10 2019

Skies were partly to mostly cloudy across the north and mostly sunny across the south early this afternoon. Temperatures ranged from the single digits across central and north-central Wisconsin to the teens across the Fox Valley and lakeshore.

The clouds should exit the area late this afternoon or early this evening. Winds may drop off for a period of time this evening and then increase again overnight. There was a large range in guidance values for lows tonight. The warmer met guidance was 3 to 7 degrees warmer than the mav guidance at Green Bay, Rhinelander and Wausau. A glance at the latest verification stats indicated the MAV guidance has a cool bias over the last few days. Took a blend of the warmer met and cooler mav guidance for lows tonight, which was near the mean of the guidance values. The combination of the cold temperatures and winds will cause wind readings to fall to 20 below to 30 below zero tonight into Wednesday morning for much of the area north and west of the Fox Valley. Have added southern Marinette and southern Oconto Counties to the wind chill advisory.

The difference in guidance values and biases continue again on Wednesday. Took a blend of the warmer met and the cooler mav guidance. Sunny skies will prevail, although it will be cold with highs in the single digits to around 10 above zero.

LONG TERM. Wednesday Night Through Tuesday Issued at 241 PM CST Tue Dec 10 2019

Temperatures Wednesday night into Thursday still are very tricky and will depend on how quickly clouds overspread the area. But compared to yesterday, it now looks like clouds will arrive a little more quickly. Adjusted the low temperature grid to have the lowest readings in the northeast part of the state. But this is a highly uncertain aspect of the forecast, and significant additional adjustments may still be needed in later issuances.

The precipitation event late Wednesday night through Thursday looks more substantial than yesterday. That isn't really surprising since the tight baroclinic zone across the area will be favorable for strong lift. Adjusted snowfalls upward, ranging from about 3-5 inches across most of the north to 1-3 inches in the south. The north may need to be bumped up even further, but the axis of heaviest snows can be quite narrow in situations such as this so was not comfortable making that big of a change 2 days out.

Another round of light snow is possible Friday night into Saturday, but that probably won't be as significant with just 1-2 inches possible across the north.

AVIATION. for 06Z TAF Issuance Issued at 1039 PM CST Tue Dec 10 2019

Other than some patches of isolated MVFR clouds, VFR conditions are expected through Wednesday afternoon at all of the TAF sites. Mid and high clouds will then increase from west to east late Wednesday afternoon and Wednesday evening ahead of an approaching low pressure system. Winds tonight have not increased over land, therefore will reduce speeds at the TAF sites until later Wednesday morning when daytime heating should bring down higher wind speeds to the surface with gusts of 15 to 20 knots. Winds should then ease Wednesday afternoon as high pressure builds in across the western Great Lakes region.

GRB WATCHES/WARNINGS/ADVISORIES. Wind Chill Advisory until noon CST Wednesday for WIZ005-010>013- 018>021-030-031-035-036-073-074.

SYNOPSIS . Skowronski SHORT TERM . Eckberg LONG TERM . Skowronski AVIATION . Kurimski

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Weather Reporting Stations

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Stations	Dist	Age	Wind	Air Temp	Water Temp	Waves	Pressure	DewPt
SXHW3 - Saxon Harbor, WI	66 mi	38 min	SSW 9.9 G 15	-6°F			1021 hPa

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Airport Reports

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Airport	Dist	Age	Wind kt	Visibility	Sky/Weather	Temp	DewPt	Humidity	Pressure
Land O' Lakes, Kings Land O' Lakes Airport, WI	5 mi	23 min	W 5	10.00 mi	Fair	-10°F	-15°F	78%	1016.9 hPa
Eagle River Union Airport, WI	20 mi	23 min	W 7	10.00 mi	Fair	-11°F	-16°F	76%	1016.9 hPa

Link to 5 minute data for KLNL

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Tide / Current Tables for

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Tide / Current Tables for

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Weather Map

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Wind Forecast for Green Bay, WI (4,6,7,8)

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Ground Weather Radar Station Marquette, MI

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