Sunday, March18, 2018

Marine Weather and Tides
Grand Marais, MN

Version 3.4
What's New / NOTES
3/3/2018 - There is a new GOES Satellite for the east coast that required rewriting that part of the code. Please report any issues.
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.

Sunrise 8:00AMSunset 8:09PM Sunday March 18, 2018 2:02 AM EDT (06:02 UTC) Moonrise 7:59AMMoonset 8:32PM Illumination 2% Phase: Waxing Crescent; Moon at 1 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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This is a Weather Statement Zone, please check the Date to see if it has expired
LSZ140 311 Am Cdt Sat Sep 23 2017
.an area of Thunderstorms over western lake superior... The areas affected include... Grand marais to taconite harbor mn... Grand portage to grand marais mn... Lake superior west of a line from saxon harbor wi to grand portage mn beyond 5nm... Silver bay harbor to two harbors mn... Taconite harbor to silver bay harbor mn... Two harbors to duluth mn... At 310 am cdt...doppler radar indicated an area of Thunderstorms... Capable of producing winds to around 30 knots and frequent cloud to water lightning. This area of Thunderstorms was located along a line extending from near horseshoe bay and safe 10 nm northwest of sand island...moving northeast at 50 knots. Locations impacted include... Split rock bay...castle danger...sugar loaf cove...tofte safe harbor...horseshoe bay and safe harbor...mouth of the poplar river... Twin points safe harbor...tofte...mouth of the little marais river... Beaver bay...mouth of the cross river...split rock lighthouse...and hollow rock bay. Precautionary/preparedness actions... Mariners can expect gusty winds to around 33 knots...locally higher waves...and lightning strikes. Boaters should seek safe harbor immediately until these storms pass. && lat...lon 4799 8941 4793 8946 4787 8964 4737 8997 4693 9138 4696 9174 4758 9088 4773 9054 4791 8981 4801 8966
This is a Weather Statement Zone, please check the Date to see if it has expired
LSZ140 Expires:201709230900;;352401 FZUS73 KDLH 230811 MWSDLH MARINE WEATHER STATEMENT NATIONAL WEATHER SERVICE DULUTH MN 311 AM CDT SAT SEP 23 2017 LSZ140>144-162-230900-

7 Day Forecast for Marine Location Near Grand Marais, MN
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location: 47.86, -89.87     debug

Area Discussion for - Duluth, MN
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Fxus63 kdlh 180523
area forecast discussion
national weather service duluth mn
1223 am cdt Sun mar 18 2018

Short term (this evening through Sunday)
issued at 212 pm cdt Sat mar 17 2018
high pressure will gradually build eastward into portions of the
central great lakes by Sunday night, while an inverted trough
develops over the central dakotas due to a developing colorado
low. This will increase cloud cover from west to east late tonight
through Sunday. Slowed down the timing of increasing cloud cover
compared to the previous forecast package. This will allow for strong
radiational cooling before clouds move in, so overnight lows are a
few degrees cooler than the previous forecast. Lows range from
the teens across inland locations, to the low to mid 20s along
the lake superior shoreline.

Expect more clouds than sunshine across much of the northland on
Sunday. Increased precipitation chances along the international
border as high resolution guidance (nam arw nmm) show a subtle
shortwave ejecting from southern manitoba into western ontario on
Sunday. Suspect the arw nmm guidance are a bit too high on qpf,
and develop more vigorous and widespread shower activity than
currently anticipate. With the increased cloud cover, expect
cooler temperatures in comparison to today, but it still will be 5
to 10 degrees warmer than normal. Highs range from the 30s in the
minnesota arrowhead, to the 40s elsewhere.

Long term (Sunday night through Saturday)
issued at 212 pm cdt Sat mar 17 2018
quiet through much of the extended with temperatures near to below
normal at the start of the week, but warming to a few degrees
above normal by the end of the week.

Initially in the extended, a subtle shortwave will move across
ontario Sunday night into early Monday. This will bring low
chances of snow and freezing drizzle along the international
border. Flow will become northeasterly off of lake superior, and
with lake surface to 850 hpa temperature differences around 10
degrees, anticipate some light lake effect snow showers or
flurries along portions of the north and south shore of lake
superior. The colorado low previously mentioned will eject into
the lower mississippi river valley on Monday, while the inverted
trough over the dakotas slides eastward. This will bring low
chances of precipitation across the brainerd lakes to the
international falls area Monday afternoon. Highs on Monday range
from the mid to upper 20s across the minnesota arrowhead, to the
30s elsewhere.

A shortwave will dig from saskatchewan late on Monday into the
northern plains by Tuesday. This will interact with the inverted
trough and develop a broad low across the upper mississippi river
valley on Tuesday. This feature will slide southeastward into the
central great lakes on Wednesday. Expect chances of light snow
across parts of northeast minnesota on Tuesday into early
Wednesday. Highs on Tuesday will be near normal with readings
ranging from the mid 20s to mid 30s.

High pressure will build into the upper mississippi river valley
late on Wednesday and into Thursday as a ridge slides into the
northern plains. The forecast becomes uncertain late in the week
as guidance is all over the place with next wave digging in from
the pacific northwest. The GFS is the quickest solution at the
moment, breaking down the ridge over the upper midwest and
ejecting a trough into the northern plains. This develops a low in
the high plains early on Friday and moves eastward into the mid
mississippi river valley on Friday. The ECMWF gem solutions are
much weaker and slower with the trough moving in. These pieces of
guidance develop a low in nearly the same area, but about 12 hours
later. Regardless, anticipate increasing chances of precipitation
on Friday and Saturday. Expect the mildest readings of the
extended on Friday with highs ranging from the mid 30s to the mid

Aviation (for the 06z tafs through 06z Sunday night)
issued at 1223 am cdt Sun mar 18 2018
high pressure will gradually lose it's grip on the
northland weather throughout the period, although skies will remain
mostly clear overnight. A weak trough moving out of the dakotas,
along with a backdoor cold front moving southwest across the cwa
will result in an increase of mid and low level clouds on Sunday. As
a result, we could see areas of MVFR cig's, developing from west to
east on Sunday, and continuing into Sunday evening.

Preliminary point temps pops
Dlh 22 40 19 31 10 10 10 10
inl 17 40 15 33 10 20 20 0
brd 18 43 22 36 0 10 10 10
hyr 17 46 21 36 0 0 10 0
asx 22 40 18 31 0 10 10 10

Dlh watches warnings advisories
Wi... None.

Mn... None.

Ls... None.

Short term... Wl
long term... Wl
aviation... Melde dap

Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
KGNA 26 mi67 min WSW 4.1 32°F 1014.6 hPa17°F
GD5 - 9099090 - Grand Marais, MN 26 mi45 min 35°F 1012.9 hPa20°F
ROAM4 - Rock of Ages, MI 30 mi63 min WNW 21 G 22 42°F 1014.5 hPa (+0.0)
DISW3 - Devils Island, WI 71 mi63 min W 8.9 G 11 37°F 1015.5 hPa (+1.2)27°F

Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Grand Marais, The Bay of Grand Marais, MN26 mi67 minWSW 4 mi32°F17°F54%1014.6 hPa

Wind History from GNA (wind in knots)
Last 24hrS3N7SW5SE3Calm3W3CalmW3W3W6SW7SW8W9SW8SW9W8SW8W4CalmCalmW4W4W4
1 day agoCalmNW3NW4NW3NW5NW4--CalmCalmSW6SW8SW10SW12SW13SW16SW14SW12W13W4CalmCalmW3SW3Calm
2 days agoCalmNE8

Tide / Current Tables for
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Tide / Current Tables for
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Weather Map and Satellite Images
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GOES 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.
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Other links: Northern Pacific     Contential US     Full GOES-East
Wind Forecast for Duluth, MN (2,6,7,8)
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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 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.