Monday, February19, 2018

Marine Weather and Tides
Copper Harbor, MI

Version 3.4
What's New / NOTES
6/25/2017 - NOAA is having a major issue that impact the 7 day forecast load times. Many users are reporting problems. The issue has been reported.
5/23/2017 - Worked with NOAA again to speed up the 7 day forecast load times. Thanks to them for being responsive.
5/19/2016 - There were issues with the 3 day airport observation history. I switched to another data source. Let me know if you see any issues with the data feeds.

Sunrise 7:15AMSunset 5:47PM Monday February 19, 2018 2:40 PM EST (19:40 UTC) Moonrise 9:23AMMoonset 10:26PM Illumination 20% Phase: Waxing Crescent; Moon at 4 days in cycle
NOTE: Some of the data on this page has not been verified and should be used with that in mind. It may and occasionally will, be wrong. The tide reports are by xtide and are NOT FOR NAVIGATION.
Marine Forecasts
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7 Day Forecast for Marine Location Near Copper Harbor, MI
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location: 63.03, -82.89     debug

Area Discussion for - Marquette, MI
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Fxus63 kmqt 191727
area forecast discussion
national weather service marquette mi
1227 pm est Mon feb 19 2018

Issued at 1049 am est Mon feb 19 2018
western counties have been added to winter wx advy. Ongoing fgen is
leading to band of fairly hvy snow extending from NW wi to around
houghton. While models don't suggest this band will remain well-
defined thru the day, radar indicates additional snow development
filling in farther s. For now, expect snow accumulations of at least
2-4in thru this aftn, warranting advy issuance. Will carry advy into
tue morning for the combination of lighter snow and some light
icing, especially SE portions of the new advy area. No meaningful
changes have been made to the rest of the fcst area.

Short term (today and tonight)
issued at 458 am est Mon feb 19 2018
short term forecast is dominated by complicated mixed precip, so
will be general with exact timing of various precip type changes and
focus on amounts.

Precip will spread from W to E today while intensifying. Primary
ptype will be snow over roughly the NW half of the u.P and freezing
drizzle rain with some snow mixed in over the SE half. Greatest
impacts today will be this afternoon and early evening when precip
will be most intense. Expect 2-3 inches of snow over the n-central
and western u.P. Today and an inch or less elsewhere. Ice amounts
are forecast to range between 0.10 inches over the E half and s-
central to a couple hundredths of an inch from near iron river to

For tonight, have generally light precip all night, but with
gradually reducing intensity through the night. Expect a mix of snow
and freezing drizzle over roughly the NW half, favoring snow earlier
in the night and a mix or more freezing drizzle later in the night.

Over the SE half, mainly freezing drizzle will be favored. Only 1-2
inches of snow expected over the NW half with ice amounts ranging
from a glaze over the far W and keweenaw to 0.10 inches over
marquette and dickinson counties. Exact precip amounts especially
over the NW half will depend on exact moisture levels in the dgz and
microphisical processes that are difficult to predict. Over the s-
central and E half, generally 0.10-0.20 inches of ice is forecast.

No changes were made to headlines.

Long term (Tuesday through Sunday)
issued at 258 am est Mon feb 19 2018
500 mb trough in the rockies and a strong 500 mb ridge off the se
coast of the u.S. Start off this forecast period 12z tue. Shortwaves
eject out of this western trough, but they get sheared out as they
approach the area. Still looks like a mess of pcpn with a wintry mix
and will continue with the advisory. Does look like amounts will be
a bit less than forecasted for ice and also snow. Did not make too
many changes to the going forecast.

In the extended, GFS and ECMWF show a 500 mb ridge across the
southeastern u.S. With a broad trough over the western u.S. 12z thu.

Pattern changes little on Fri and then the trough starts to move
into the rockies and western high plains on sat. Pattern gets slowly
de-amplified this forecast period. Temperatures will be above normal
for this forecast period.

Aviation (for the 18z tafs through 18z Tuesday afternoon)
issued at 1227 pm est Mon feb 19 2018
ifr conditions (vis and or cigs) will mostly be the rule thru this
fcst period at kiwd kcmx ksaw as waves of pcpn move NE across the
upper lakes. While pcpn should be only snow at kiwd kcmx, snow at
ksaw will likely mix with or change to -fzdz at times tonight thru
tue morning. May even be a period of only -fzra Tue morning.

Marine (for the 4 am lake superior forecast issuance)
issued at 458 am est Mon feb 19 2018
winds are expected to stay below gales through the forecast period.

Mqt watches warnings advisories
Upper michigan...

winter weather advisory until midnight est 11 pm cst Tuesday
night for miz006-007-012>014-085.

Winter weather advisory until 7 pm est 6 pm cst Tuesday for

Winter weather advisory until 1 pm est noon cst Tuesday for

Lake superior...


Lake michigan...


Update... Rolfson
short term... Titus
long term... 07
aviation... Rolfson
marine... Titus

Weather Reporting Stations
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Airport Reports
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Tide / Current Tables for
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Weather Map and Satellite Images
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Weather Map
IR Satellite Image from GEOS

GOES Local Image of GreatLakes    EDIT

Wind Forecast for Marquette, MI (14,3,4,5)
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Ground Weather Radar Station Marquette, MI
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The information on this web site has not been checked for accuracy. It is for entertainment purposes only and should be independently verified before using for any other reason. There are five sources. 1) Documents and manuals from a variety of sources. These have not been checked for accuracy and in many cases have not even been read by anyone associated with I have no idea of they are useful or accurate, I leave that to the reader. 2) Articles others have written and submitted. If you have questions on these, please contact the author. 3) Articles that represent my personal opinions. These are intended to promote thought and for entertainment. These are not intended to be fact, they are my opinions. 4) Small programs that generate result presented on a web page. Like any computer program, these may and in some cases do have errors. Almost all of these also make simplifying assumptions so they are not totally accurate even if there are no errors. Please verify all results. 5) Weather information is from numerious of sources and is presented automatically. It is not checked for accuracy either by anyone at or by the source which is typically the US Government. See the NOAA web site for their disclaimer. Finally, tide and current data on this site is from 2007 and 2008 data bases, which may contain even older data. Changes in harbors due to building or dredging change tides and currents and for that reason many of the locations presented are no longer supported by newer data bases. For example, there is very little tidal current data in newer data bases so current data is likely wrong to some extent. This data is NOT FOR NAVIGATION. See the XTide disclaimer for details. In addition, tide and current are influenced by storms, river flow, and other factors beyond the ability of any predictive program.