Marine Weather and Tides
10/6/2018 Colors of tide XTide graphs changed to emphasize that they were upgraded. See next note. Comments welcome.
10/4/2018 I have fixed XTide and updated the harmonic files. There were some name changes so you might have to click EDIT to find the new station name.
|Sunrise 7:02AM||Sunset 4:26PM||Tuesday November 20, 2018 7:23 AM CST (13:23 UTC)||Moonrise 3:30PM||Moonset 3:48AM||Illumination 94%|
7 Day Forecast for Marine Location Near Rib Lake, WIHourly EDIT Help
Area Discussion for - Green Bay, WI  (on/off)  Help NOTE: mouseover dotted underlined text for definition
|Fxus63 kgrb 201153|
area forecast discussion
national weather service green bay wi
553 am cst Tue nov 20 2018
updated aviation portion for 12z TAF issuance
Short term Today... Tonight... And Wednesday
issued at 328 am cst Tue nov 20 2018
the main forecast concerns are precipitation trends and type this
afternoon and evening.
Cyclonic north flow was still producing flurries over central and
east central wi early this morning, and lake-effect snow showers
and flurries continued over vilas county. The light precipitation
should taper off over the next several hours as a ridge of high
pressure pushes in from the west. Sky cover was a bit chaotic
early this morning, but clearing had occurred over a large part
of far northeast wi.
There should be a break in the precipitation and partial clearing
this morning, as the surface ridge moves through the state. A
clipper low pressure system is forecast to track north of the
forecast area this afternoon and evening, with the main upper
dynamics also staying to our north. However there will be some
weak forcing, as 850 mb WAA occurs this afternoon, followed by a
cold frontal passage during the evening. Some of the initial waa
forcing will be wasted in the early afternoon due to a substantial
dry air in the 900-800 mb layer, but enough saturation should
occur for light snow and freezing drizzle from mid-afternoon to at
least mid-evening. Shallowing moisture will result in a loss of
ice crystals in the saturated layer in the late afternoon and
evening, leading to the threat of freezing drizzle, and possible
light ice accumulations in some areas. Snow accumulations should
be a dusting to half inch in most places, with perhaps an inch or
so across vilas county.
Subsidence and continued shallowing of the moisture layer should
cause precipitation to taper off by midnight, except in far north
central wi, where light lake-effect will continue overnight. The
arrival of another canadian high pressure system should bring
partial clearing and cold temperatures to region on Wednesday.
Long term Wednesday night through Monday
issued at 328 am cst Tue nov 20 2018
mean flow is expected to be progressive during this part of the
forecast with two pacific systems to impact northeast wi. The
first system is set to arrive late Friday into at least Saturday
morning with temperatures warm enough for either rain or a
rain snow mix. The second system is forecast to arrive late this
weekend into early next week, be stronger than its predecessor and
has more timing movement issues that will need to be resolved.
Temperatures with this second system to also be colder, thus more
snow potential. Temperatures to briefly go above normal Friday and
Saturday before falling below normal by next Monday.
High pressure is expected to move from western ontario into
southeast ontario Wednesday night and allow for winds to veer
northeast. 8h temperatures around -16c would be sufficient for
lake effect snow showers over lake mi, however with inversion
heights at 4k feet and winds slowly veering through the night, it
may be difficult for snow showers to align long enough to generate
anything more than isolated snow showers or simply flurries. The
rest of the forecast to be mostly cloudy and dry with min
temperatures to range from around 5 above zero far north, around
20 degrees near lake mi.
As the surface high reaches the eastern great lakes on
thanksgiving day, winds will continue to veer to the southeast and
begin to tap some 'milder' air. Meanwhile, models bring a modest
upper ridge axis into the western great lakes region late on
Thursday. An increase in waa, coupled with low inversion heights,
may keep more clouds across northeast wi than sunshine. Max
temperatures for Thursday to be in the upper 20s north, lower 30s
The pressure gradient is expected to tighten over the great lakes|
between the high pressure over the eastern CONUS and a trough of
low pressure over the central conus. The prevailing south winds
into wi should continue the WAA pattern, but time sections show a
dry layer in the lower levels of the atmosphere, thus have kept
the forecast area dry for Thursday night. Under partly to mostly
cloudy skies, look for min temperatures to not be nearly as cold
as previous nights. Readings should only fall a couple of degrees
with middle to upper 20s north, upper 20s to around 30 degrees
south. Clouds are forecast to increase on Friday ahead of an
advancing mid-level shortwave trough and surface cold front.
Models are still having timing issues with the GFS already
spreading light rain across most of northeast wi Friday afternoon,
while the gem and ECMWF have the light rain just reaching western
wi by 00z Saturday. The progressive nature of the mean flow would
favor the gfs, thus do not want to discount this model just yet.
For now, will bring chance pops into central wi Friday afternoon
and keep eastern wi dry through the day. MAX temperatures to be
above normal (for a change) with around 40 degrees north, lower to
middle 40s south.
Precipitation does appear likely for Friday night as the shortwave
trough pushes east into the western great lakes and the trailing
cold front reaches the upper ms valley. The precipitation would
initially be all rain, but as temperatures drop, anticipate a
transition to a rain snow mix then all snow from west to east. The
only exception would be east-central wi where a mix would continue
through the overnight hours. The model differences persist into
Saturday as the faster GFS exits the system, while the gem ecmwf
still have the shortwave trough moving through wi followed by the
cold front. Precipitation type will transition back to all rain
from east-central to north-central wi with a mix returning late in
the day to north-central wi. Due to these model timing issues, it
is too early to determine snow accumulation numbers between
Friday night and Saturday morning. MAX temperatures for Saturday
to be in the upper 30s north-central wi, lower 40s east-central
Models are still trying to get a handle on the second system due
to arrive Sunday into Monday. While the models do agree with the
movement from the southern plains Sunday morning to the eastern
great lakes Monday afternoon, the GFS is much stronger,
vertically-stacked and has a more broad precipitation shield than
the other models. The GFS would also bring an accumulating snow to
much of northeast wi Sunday night into Monday. The gem and ecmwf
are not as strong with this system and do not generate as much
precipitation across wi (focusing more on the southern half of the
state). Since this system is still over the pacific, expect the
models to change their solutions several times in the coming days.
Therefore, have followed the model consensus which brings low to
moderate chance pops into the forecast area for both Sunday and
Monday. Precipitation types will also waffle between rain and
snow on Sunday, but turn more to snow on Monday as colder air gets
pulled into wi behind the system.
Aviation For 12z TAF issuance
issued at 540 am cst Tue nov 20 2018
partial clearing had occurred early this morning, but much of the
region still had MVFR ceilings and flurries.
A clipper low pressure system will bring light snow, patchy
freezing drizzle and associated MVFR conditions this afternoon
and evening. Some improvement toVFR is possible after midnight.
Gusty southwest winds will develop this afternoon, then turn west
to northwest tonight after a cold front passes.
Grb watches warnings advisories
Short term... ..Kieckbusch
long term... ... Kallas
aviation... ... .Kieckbusch
Weather Reporting StationsEDIT (on/off)  Help NOTE: Click on distance to see the station location on a map
|Stations||Dist||Age||Wind||Air Temp||Water Temp||Waves||Pressure||DewPt|
|SXHW3 - Saxon Harbor, WI||96 mi||43 min||SW 1.9 G 2.9||12°F||1021.3 hPa|
Airport ReportsEDIT (on/off)  Help Click EDIT to display multiple airports
|Taylor County Airport, WI||15 mi||28 min||W 5||7.00 mi||Light Snow||15°F||10°F||82%||1020.3 hPa|
|Merrill, Merrill Municipal Airport, WI||19 mi||28 min||N 0||10.00 mi||Overcast||12°F||9°F||90%||1021 hPa|
|Tomahawk Regional Airport, WI||22 mi||28 min||N 0||7.00 mi||Light Snow||8°F||5°F||89%||1020.3 hPa|
Wind History from MDZ (wind in knots)
|1 day ago|
|2 days ago|
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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.
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Wind Forecast for Green Bay, WI (8,2,3,4)(on/off)  Help
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