Tuesday, April23, 2019 L-36.com

Marine Weather and Tides
Copper Harbor, MI

Version 3.4
What's New / NOTES
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 6:09AMSunset 8:22PM Tuesday April 23, 2019 5:52 AM EDT (09:52 UTC) Moonrise 1:02AMMoonset 6:43AM Illumination 84% Phase: Waning Gibbous; Moon at 19 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 230820
area forecast discussion
national weather service marquette mi
420 am edt Tue apr 23 2019

Short term (today and tonight)
issued at 411 am edt Tue apr 23 2019
wv imagery and rap analysis indicated a mid upper level trough from
nw ontario through the western great lakes. A prominent shortwave
was noted over central lake mi lifting slowly to the northeast. 850-
700 mb fgen in the comma head of the shortwave was supporting an
area of rain over the eastern half of the CWA early this morning.

Today, models indicate fgen forcing weakening over the eastern
counties through the remainder of the morning as the shortwave over
lake mi continues to lift slowly NE into lower mi. Expect rain to
gradually taper off and end over the eastern counties by late
morning. Moist low-levels could allow patchy fog to linger through
sunrise for much of the area. Mid-level troughing over the area will
get replaced by mid level and sfc ridging from west to east this
afternoon. The associated subsidence drying will allow clouds to
clear from west to east through the day but clouds may linger a
bit longer north central where upslope northerly flow continues.

Even with afternoon sunshine, northerly winds will keep highs in
the 40s north while readings climb into the lower to mid 50s

Tonight. Sfc ridging over the area will allow temps to dip quickly
this evening under clear skies and calm winds. Went on the lower end
of model guidance with min temps in the mid to upper 20s over the
typical interior cold spots of central and eastern upper mi.

Light return southerly flow mixing ahead of the next trough
approaching from the northern plains will keep min temps a bit
higher over the western counties (lower to mid 30s) and will
eventually stop temps from falling much further overnight over the
central and eastern cwa.

General cooling drying trend should slow runoff and slow
additional rises on area streams and rivers over the next 24
hours. As a result, will likely cancel areal flood watch this

Long term (Wednesday through Monday)
issued at 404 am edt Tue apr 23 2019
shortwave trough moving in later Wednesday may bring some light rain
showers to western upper michigan. SW winds ahead of sfc trough
associated with the shortwave will result in temps surging well into
the 60s away from lk michigan and the east. Thickening mid clouds at
10-15kft well ahead of sfc trough will be the only thing that stops
temps from climbing further. Sfc trough crosses on Wednesday night
but appeasr best chance for showers occurs late Wednesday night into
midday Thursday along and behind the trough as upper jet and h8-h7
fgen combine with convergence along the trough to produce what may
become widespread showers over the south and east. Temps will stay
up on Wednesday night mainly in the 40s as the trough moves through.

Warmth continues on Thursday with many areas seeing upper 50s to mid
60s. Any runoff into already swollen rivers will continue with
these warm temps.

With another shortwave digging in late Thursday into Thursday
evening, could see the clouds and showers persist well into the aftn
over the east half. If that does occur, temps over east would end up
a bit cooler than this forecast. High pressure ridge brings drier
weather by Friday but it will turn cooler as shortwave trough
digging across lower great lakes ushers in cooler air across the
upper great lakes with 850mb temps down below -6c. High temps on
Friday more areas will only reach the mid to upper 40s. The cool air
aloft will at the least keep lake effect clouds over the area and
there may be enough lift with the cold air to result in some lake
effect rain snow showers.

Cool weather continues into next weekend. The system that was shown
to affect parts of upper michigan with possible accumuting snow has
trended to the south. Latest ECMWF and GFS gfs-fv3 only graze far
scntrl upper michigan with precip Friday night into Saturday while
canadian-nh is just a bit farther north and west. Canadian ensembles
look more like the gfs ECMWF idea. Trend from GFS just started with
00z run, so we'll have to see how that holds up. ECMWF trended
sharply south with 12z 22 april run, but latest idea is bit farther
north. Don't think you can go away from at least some wintry precip
affecting upper michigan this weekend, not yet at least. Another
system early next week could bring more precip and depending on
track of low-level low, there could be some wintry precip with that
one as well even as the calender will be just about to turn the page
to may.

Aviation (for the 06z tafs through 06z Tuesday night)
issued at 137 am edt Tue apr 23 2019
conditions will continue to improve at all sites overnight as rain
moves out and drier air moves in. Will improve quickly toVFR
first at cmx overnight with slower improvement toVFR at saw tue
afternoon as upslope north flow continues to keep conditions down
at that site.

Marine (for the 4 am lake superior forecast issuance)
issued at 411 am edt Tue apr 23 2019
north winds 15 to 25 knots are expected over the east half of lake
superior today. Otherwise, a quiet stretch of weather will continue
from midweek on as winds remain below at or below 20 knots.

Mqt watches warnings advisories
Upper michigan...

flood watch until 2 pm edt 1 pm cdt this afternoon for

Lake superior...


Lake michigan...


Short term... Voss
long term... Jla
aviation... 07
marine... Voss

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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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 Marquette, MI (5,6,7,8)
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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 L-36.com. 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 L-36.com 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.