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Marine Weather and Tides
Version 3.4 |
10/9/2019 Updated the Marine Zones. 9/4/2019 Fixed the weather maps due to NOAA moving them. 7/25/2019 New feature in the Airports section gives a link to 5 minute updates for data reports. 6/2/2019. Many thanks to a user for reporting an error on one of the Edit pages. The switch to PHP 7.2 caused many pages that previously worked to quit working. I fixed many but I still depend on users to report ones I missed. Please report errors HERE or send an email to me at L-36.com. Allen |
Sunrise 7:11AM | Sunset 4:13PM | Monday December 9, 2019 10:30 PM CST (04:30 UTC) | Moonrise 3:55PM | Moonset 5:16AM | Illumination 97% | ![]() |
LMZ543 Expires:201912101130;;119773 Fzus53 Kgrb 100318 Nshgrb Nearshore Marine Forecast National Weather Service Green Bay Wi 918 Pm Cst Mon Dec 9 2019 For Waters Within Five Nautical Miles Of Shore On Lake Michigan Lmz541>543-101130- Rock Island Passage To Sturgeon Bay Wi- Sturgeon Bay To Two Rivers Wi-two Rivers To Sheboygan Wi- 918 Pm Cst Mon Dec 9 2019
.small craft advisory in effect until 6 am cst Tuesday...
Rest of tonight..NW wind 15 to 25 kts with gusts to 30 kts. Waves 3 to 5 ft subsiding to 2 to 4 ft. Scattered snow showers late in the evening.
Tuesday..W wind 15 to 25 kts decreasing to 10 to 20 kts in the morning. Waves 1 to 3 ft. Partly cloudy.
Tuesday night..W wind 10 to 20 kts increasing to 15 to 25 kts after midnight. Waves 1 to 3 ft. Partly cloudy.
Wednesday..NW wind 15 to 25 kts decreasing to 10 to 20 kts early in the afternoon. Waves 1 to 3 ft. A chance of flurries in the morning.
.small craft advisory in effect until 6 am cst Tuesday...
Rest of tonight..NW wind 15 to 25 kts with gusts to 30 kts. Waves 3 to 5 ft subsiding to 2 to 4 ft. Scattered snow showers late in the evening.
Tuesday..W wind 15 to 25 kts decreasing to 10 to 20 kts in the morning. Waves 1 to 3 ft. Partly cloudy.
Tuesday night..W wind 10 to 20 kts increasing to 15 to 25 kts after midnight. Waves 1 to 3 ft. Partly cloudy.
Wednesday..NW wind 15 to 25 kts decreasing to 10 to 20 kts early in the afternoon. Waves 1 to 3 ft. A chance of flurries in the morning.
LMZ543
7 Day Forecast for Marine Location Near Two Rivers, WI
Hourly EDIT Helplocation: 44.15, -87.56 debug
Area Discussion for - Green Bay, WI
  (on/off)  Help NOTE: mouseover dotted underlined text for definitionFXUS63 KGRB 092336 AFDGRB
Area Forecast Discussion National Weather Service Green Bay WI 536 PM CST Mon Dec 9 2019
Updated aviation portion for 00Z TAF issuance
SYNOPSIS. Issued at 231 PM CST Mon Dec 9 2019
Wintry precipitation ending this evening, then a brief shot of much colder air for the middle of the week. Temperatures returning to above normal by the end of the work week.
The amplitude of the large scale flow across the CONUS has peaked. A strong jet surging east from the Pacific will rapidly undercut West Coast ridging, transitioning the flow across the CONUS into a seasonably strong highly zonal regime by late in the week. Some reamplification now seems likely late in the period, with a trough forming over the Rockies and ridging developing near the West Coast and from the Gulf of Mexico into the Atlantic.
Much colder air surging into the area will take temperatures briefly down to considerably below normal by mid-week, but readings will rebound to above normal by the end of the work week and the start of the upcoming weekend before falling off again at the end of the period. Though the details of individual systems that will affect the area remain sketchy given the developing zonal flow, there will likely be at least a couple rounds of precipitation during the period. But with Gulf moisture likely remaining south and east of the area, amounts will probably end up below normal.
SHORT TERM. Tonight and Tuesday Issued at 231 PM CST Mon Dec 9 2019
Drizzle, freezing drizzle and snow continued across the region this afternoon. Temperatures ranged from near 20 across the far north to the middle 30s at Manitowoc.
A band of heavy snow continues to move across northeast Wisconsin this afternoon. Issued a winter weather advisory earlier for the Fox Valley and lakeshore as this heavy band of snow will impact the afternoon and evening rush hours. Visibilities in this band of snow were down to around a quarter of a mile. With poor visibilities, falling temperatures and roads becoming snow covered will make for hazardous conditions. For the locations north and west of the Fox Valley, current ending of headlines looks good. Light snow will linger into Tuesday morning across the far north although accumulations will be on the light side.
Colder air works in the region tonight with lows in the single digits below zero across north-central Wisconsin with readings near 10 above across the Fox Valley and lakeshore. Snow showers will linger across the far north tuesday, otherwise it will be partly cloudy and cold with highs in the single digits well west and north of the Fox Valley to the teens across the Fox Valley and lakeshore.
LONG TERM. Tuesday Night Through Monday Issued at 231 PM CST Mon Dec 9 2019
The most significant combination of cold temperatures and wind still looks like it will occur late Tuesday night through Wednesday morning. The forecast apparent temperature has eased a bit from what it was a couple days ago, but would support a Wind Chill Advisory across about the northwest half of the area. That's still over a day away, so will allow the current headlines to continue to play out and forego posting the advisory with this forecast issuance.
Temperatures Wednesday night into Thursday are much trickier. Clouds will eventually increase from the west, but that may not occur until after dark. Winds will be very light or calm with the anticyclone center sprawled across the region. It's quite possible that temperatures will plunge rapidly during the evening, then bounce back once clouds move overhead. Of course, the timing of the arrival of the clouds will be critical and might still change with later forecasts. For now, adjusted temperatures downward several degrees and amplified the atypical diurnal temperature trend in the hourly temperature grids.
Ascent due to isentropic lift along the back side of the receding cold air mass combined with weak/ill defined shortwaves crossing the region in the developing zonal flow regime will likely bring a couple rounds of light snow in the Thursday-Saturday time frame. Thursday, and Friday night into Saturday look like the most favorable times at this point. But the low amplitude nature of the flow typically leads to timing difficulties, so precipitation timing could change in later forecasts. Regardless of the timing, an inch or two of snow will be possible with each event.
AVIATION. for 00Z TAF Issuance Issued at 536 PM CST Mon Dec 9 2019
Snow should gradually end from west to east across much of the area this evening, except across the far north where snow showers will linger into Tuesday morning. Gusty northwest winds to near 30 mph are possible across much of the area early this evening, then gradually diminish overnight. CIGS expected to rise into the MVFR/VFR category tonight as drier air works its way in from the west. Winds will back to the west on Tuesday and increase into the 15 to 20 knot range.
GRB WATCHES/WARNINGS/ADVISORIES. Winter Weather Advisory until 8 PM CST this evening for WIZ022- 038>040-048>050.
Winter Weather Advisory until 6 PM CST this evening for WIZ005- 010>013-018>021-030-031-035>037-045-073-074.
SYNOPSIS . Skowronski SHORT TERM . Eckberg LONG TERM . Skowronski AVIATION . Kurimski
Weather Reporting Stations
EDIT (on/off)  Help NOTE: Click on distance to see the station location on a mapStations | Dist | Age | Wind | Air Temp | Water Temp | Waves | Pressure | DewPt |
KWNW3 - 9087069- Kewaunee, WI | 22 mi | 43 min | NW 13 G 19 | 23°F | 1003.7 hPa | |||
SGNW3 - Sheboygan, WI | 29 mi | 31 min | NNW 13 G 15 | 28°F | 1005.6 hPa (+5.7) |
Wind History for Kewaunee MET, WI
(wind in knots) EDIT (on/off)  Help11 PM | 12 AM | 1 AM | 2 AM | 3 AM | 4 AM | 5 AM | 6 AM | 7 AM | 8 AM | 9 AM | 10 AM | 11 AM | 12 PM | 1 PM | 2 PM | 3 PM | 4 PM | 5 PM | 6 PM | 7 PM | 8 PM | 9 PM | 10 PM | |
Last 24hr | W | NW | E | NW G4 | E | E G10 | E G10 | NE G10 | NE | N | NW G7 | N G8 | NW G6 | NW G8 | N G8 | N G6 | NW G7 | N G6 | NW G9 | NW G17 | N G17 | N G22 | NW G20 | NW G15 |
1 day ago | S | S G22 | S G23 | S G20 | SW G16 | S G17 | S | S G18 | S | S | S G11 | SW G10 | SW G10 | SW | SW G9 | SW G7 | SW | W | S | -- | NW | NW | NW | NW |
2 days ago | NW G6 | W | NW | W | SW G7 | W G4 | NW | SW G8 | SW G8 | S G5 | SW | SW G13 | SW | S G14 | S G13 | S G15 | S G14 | S G15 | S G14 | SW G16 | S G24 | S G23 | S | S G22 |
Airport Reports
EDIT (on/off)  Help Click EDIT to display multiple airports. Follow links for more data.Airport | Dist | Age | Wind kt | Visibility | Sky/Weather | Temp | DewPt | Humidity | Pressure |
Manitowoc, Manitowoc County Airport, WI | 6 mi | 35 min | NW 15 G 20 | 10.00 mi | Light Snow | 25°F | 21°F | 85% | 1005.8 hPa |
Link to 5 minute data for KMTW
Wind History from MTW (wind in knots)
11 PM | 12 AM | 1 AM | 2 AM | 3 AM | 4 AM | 5 AM | 6 AM | 7 AM | 8 AM | 9 AM | 10 AM | 11 AM | 12 PM | 1 PM | 2 PM | 3 PM | 4 PM | 5 PM | 6 PM | 7 PM | 8 PM | 9 PM | 10 PM | |
Last 24hr | Calm | Calm | N | N | NE | NE | Calm | NE | N | N | NW | N | NW | N | N | NW | W | W | NW | NW | N | NW | NW G20 | |
1 day ago | S | S | S | S | S | S | S | S | S | S | S | S | SW | SW | SW | SW | SW | SW | Calm | Calm | Calm | NW | Calm | N |
2 days ago | Calm | Calm | W | Calm | Calm | Calm | Calm | Calm | Calm | S | S | S | S | S | SW | S | S | S | S | S | S G20 | S G20 | S | S |
Tide / Current Tables for
EDIT Weekend mode (on/off) (on/off)  HelpTide / Current Tables for
EDIT (on/off)  HelpWeather Map
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GEOS Local Image of 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
Wind Forecast for Green Bay, WI (23,6,7,8)
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Ground Weather Radar Station Green Bay, WI
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