Marine Forecasts

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7 Day Forecast for Marine Location Near Ephraim, WI

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Area Discussion for - Green Bay, WI

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FXUS63 KGRB 291146 AFDGRB

Area Forecast Discussion National Weather Service Green Bay WI 546 AM CST Sat Feb 29 2020

Updated aviation portion for 12Z TAF issuance

SHORT TERM. Today . Tonight . and Sunday Issued at 314 AM CST Sat Feb 29 2020

Slightly warmer temperatures are expected today as surface high pressure moves off to the east and winds become southwest. With mostly sunny skies and modest winds the weather should be ideal for most winter sports. High temperatures should be close to normal for this time of the year.

Middle and high clouds will increase tonight as a weak front approaches from Minnesota. Low temperatures may be during the late evening hours in the west part of the forecast area.

The weak front will move across the region Sunday. Some of the models suggest there could be a little light rain or drizzle, but the moisture does not appear to be sufficient for any precipitation. Highs will be ten degrees or more above normal, even with cloud cover.

LONG TERM. Sunday Night Through Friday Issued at 314 AM CST Sat Feb 29 2020

Long term period still looking quiet with no major systems impacting the area. Only forecast concerns will be pinpointing low chances for (mainly light) precip in the Tuesday-Thursday timeframe. Temps will remain above normal through the period with the cold/arctic air trapped well north of the region. A slow snow melt is expected through the period, but minor river flooding and ice jamming will be possible.

Sunday night through Monday night . high pressure will build into the western Great Lakes, bringing dry and quiet weather conditions. The cold front will complete its passage of the area Sunday evening. Other than a wind shift to the west/northwest, not expecting much fanfare with the front as moisture is limited and upper support is lacking/north of the area. Brief period of cold air advection behind the front will bring slightly cooler temps to the area on Monday, but temps should remain slightly above normal. Mostly clear skies and light winds will make for a chilly Monday night as the high moves overhead. Might need to lower low temps in later forecasts, especially in the typical cold spots, if skies sufficiently clear and winds go calm. If this occurs, snowmelt could add enough low level moisture for some fog development.

Tuesday into Wednesday . mid-level shortwave and cold front will swing across the area on Tuesday, bringing chances for precip to the area. Models have trended stronger with this feature, so increased POPs slightly, especially across northern WI. Limited moisture will keep precip on the light side, but potent nature of the trough/shortwave should bring at least some snow shower activity with it. Highest chances to see any snow accumulation looks to be across northern WI. Additional weak pieces of shortwave energy will cross the area Tuesday night into Wednesday, but pinning these down will be difficult and any precip looks to be on the light side, so will only go with some slight chances POPs for now.

Rest of the extended . another potent shortwave is forecast to dig across the western Great Lakes on Thursday, with a surface low and cold front swinging across the area as well. GFS is the weaker/ faster outlier with this system and will lean toward the ECMWF and Canadian and introduce chance POPs for most of the area. While the true Gulf moisture will stay southeast of the region, this system could have a ribbon of higher moisture to work with. Once this system exits to the east, high pressure will spread from the Plains into the Great Lakes for the end of the week.

AVIATION. for 12Z TAF Issuance Issued at 546 AM CST Sat Feb 29 2020

Favorable flying weather is expected today through the evening, with clear skies and light to moderate surface winds. MVFR ceilings may arrive late tonight in northcentral Wisconsin and across the remainder of the area Sunday morning. Low level wind shear is possible after midnight tonight with light south winds at the surface and southwest winds at 40 knots around 2000 ft agl.

GRB WATCHES/WARNINGS/ADVISORIES. NONE.

SHORT TERM . RDM LONG TERM . Bersch AVIATION . RDM

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Weather Reporting Stations

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Stations	Dist	Age	Wind	Air Temp	Water Temp	Waves	Pressure	DewPt
NPDW3 - Northport Pier at Death's Door WI	14 mi	70 min	W 7 G 12	16°F			1017.6 hPa
MN4 - 9087088 - Menominee, MI	22 mi	50 min	W 11 G 14	11°F	35°F		1018.4 hPa (+0.7)	-1°F
FPTM4 - Fairport, MI	42 mi	70 min	NW 12 G 15	17°F			1016.9 hPa

Wind History for Menominee, MI

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W8 G11

SW7

W8 G11

W11 G29

NW11 G15

NW12 G19

W13 G19

NW16 G29

NW20 G26

NW19 G23

NW16

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NW11 G15

NW11 G15

NW12 G16

NW10 G16

NW7 G10

NW8 G11

W9 G13

W9 G17

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W11 G14

1 day ago

W10 G14

W13 G22

NW16 G20

NW18 G28

NW17 G24

NW19

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NW12 G19

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NW15 G21

NW13 G17

NW12 G19

W9 G12

W6 G9

W7 G10

W10 G15

W10 G13

W9 G12

W7 G11

W8 G12

2 days ago

NW11

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NW11 G14

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NW13 G17

NW15

N15 G24

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N18 G22

NW14 G20

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N17

N11 G14

N9

NW8 G12

NW14 G17

W8 G11

W9 G13

W11

W12 G15

W8 G11

W11 G14

W8 G14

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Airport Reports

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Airport	Dist	Age	Wind kt	Visibility	Sky/Weather	Temp	DewPt	Humidity	Pressure
Menominee - Marinette Twin County Airport, MI	24 mi	54 min	WNW 3	10.00 mi	Fair	9°F	0°F	66%	1020.1 hPa
Door County Cherryland Airport, WI	24 mi	54 min	W 6	10.00 mi	Fair	11°F	0°F	61%	1020 hPa

Link to 5 minute data for KMNM

Wind History from MNM (wind in knots)

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W4

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NW5

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NW12 G21

NW8 G18

NW14 G19

N12 G17

N15 G27

NW13 G20

N11 G18

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1 day ago

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NW12 G19

N14 G21

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NW13 G19

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N10 G17

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NW10 G16

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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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GEOS Local Image of GreatLakes    EDIT
NOTE: East coast views moved to GEOS-16. They are experimental and not well supported by NOAA so they may not be correct so be warned. This change required redoing a large amount of the GOES code. If the image you are expecting is not showing, please let me know. You may need to use the EDIT function to update your location.
Link to Loop

Other links: Northern Pacific     Contential US     Full GOES-East

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

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Ground Weather Radar Station Green Bay, WI

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