Tuesday, September18, 2018 L-36.com

Marine Weather and Tides
Grand Marais, MN

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Sunrise 7:38AMSunset 8:04PM Tuesday September 18, 2018 5:23 PM EDT (21:23 UTC) Moonrise 4:01PMMoonset 12:09AM Illumination 64% Phase: Waxing Gibbous; Moon at 9 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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LSZ140 1253 Am Cdt Sun Sep 16 2018
.a strong Thunderstorm over western lake superior... The areas affected include... Grand portage to grand marais mn... Lake superior west of a line from saxon harbor wi to grand portage mn beyond 5nm... At 1251 am cdt, doppler radar indicated a strong Thunderstorm, capable of producing winds to around 30 knots. This strong Thunderstorm was located 8 nm southwest of horseshoe bay and safe harbor, moving east at 35 knots. Additional storms between hovland and grand portage are also moving east at 35 knots. Locations impacted include... Horseshoe bay and safe harbor and pigeon point. 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 this storm passes. && lat...lon 4801 8949 4799 8941 4797 8942 4793 8946 4789 8954 4787 8964 4760 8982 4765 9024 4781 9021 4791 8981 4801 8966
LSZ140 Expires:201809160615;;714777 FZUS73 KDLH 160553 MWSDLH Marine Weather Statement National Weather Service Duluth MN 1253 AM CDT SUN SEP 16 2018 LSZ140-162-160615-

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 182042
area forecast discussion
national weather service duluth mn
342 pm cdt Tue sep 18 2018

Short term (this evening through Wednesday)
issued at 342 pm cdt Tue sep 18 2018
at 330 pm, cloudy skies prevailed across much of the region. The
exception was northern koochiching and northwest saint louis
county, which saw sunny skies break out this afternoon.

Temperatures ranged from the upper 40s at the grand marais
airport, to the 50s to lower 60s elsewhere. Winds were northeast
across the entire region. The drizzle from earlier today seems to
have abated across the area, as ceilings rose.

The focus for tonight will definitely be on the potential for
precipitation overnight. The next batch of precipitation should
move northward during the latter half of the night, as an intense
llj redevelops throughout the plains. Will continue to increase
pop's across the south especially, with little precipitation
expected to reach north of the highway 2 corridor overnight.

The focus by Wednesday will be in the southeast half of the cwa,
with up to a quarter inch of rainfall expected during the day.

Portions of the southeast could see around 0.35 inch during the
day Wednesday. Gusty northeast winds will continue across the area
with a considerable amount of cloud cover.

Long term (Wednesday night through Tuesday)
issued at 342 pm cdt Tue sep 18 2018
an active fall weather pattern settles in late this week into next
week with a few chances for rainfall and seasonable temperatures.

Primary weather concern for the long-term forecast is heavy rainfall
expected Wednesday night through Friday morning.

On the synoptic scale, by mid-week a broad mid upper level ridge
will be building over the southeast towards the carolinas as a mid-
level longwave trough tracks east across the rockies and into the
great plains. A surface low will deepen over eastern colorado as a
result of the falling heights as the mid-level trough approaches,
with the surface low tracking northeast towards the upper great
lakes late-week. As this surface low tracks towards the upper
midwest, southerly low level flow will increase the low level
moisture resulting in deep moisture in place when the strong broad-
scale lift from the approaching mid-level trough reaches the region.

Rain, heavy at times, is expected as the low approaches and moves
across central mn into northern wi, with the heaviest rainfall rates
Thursday afternoon. While flash flooding is not anticipated at this
point, some minor ponding is possible and rivers will rise. In
addition, this fall storm will go on a near-perfect track for
producing strong easterly winds across western lake superior, and
while the surface low will not be unusually strong (falling to
around 994 mb over central lake superior Thursday night), it may be
the first storm of the fall to produce gales on lake superior.

The low exits to the east and rain gradually ends Friday morning as
a cool area of high pressure builds in from the west. The surface
high will be over the upper midwest Friday night, and with clear
skies temperatures will fall to near the freezing mark in some
spots. The mid upper level pattern across north america becomes more
zonal, promoting a number of fast-moving mid-level shortwave troughs
to track across the region late in the weekend into next week. A
chance for light rain Saturday night into Sunday morning with a weak
front, but for the most part the forecast is now trending towards a
mostly dry and seasonable weekend.

Monday into Tuesday another similar set-up to this Wed thurs
rainfall, with the possibility for heavy rainfall amounts and strong

Temperatures seasonable throughout the long term period with highs
in the 50s to 60s and lows in the 30s to 40s. Lows coldest Friday
night when a frost is possible away from lake superior, but
otherwise no frosts or hard freezes on the horizon.

Aviation (for the 18z tafs through 18z Wednesday afternoon)
issued at 1229 pm cdt Tue sep 18 2018
MVFR to ifr ceilings across the region will briefly improve toVFR
late this afternoon into the early evening as some of the stratus
breaks up, but then conditions will deteriorate to ifr late
tonight with ceilings down to lifr possible at dlh. Some
fog drizzle is possible reducing visibility late tonight through
Wednesday, then rain showers will spread from south to north
through the day Wednesday, most likely to impact brd and hyr in
the Wednesday morning hours. Winds becoming light variable
overnight at less than 5 knots, then easterly at 5 to 10 knots
Wednesday, strongest at dlh where gusts to 15 knots are possible
on Wednesday.

Preliminary point temps pops
Dlh 49 59 51 57 30 50 40 100
inl 42 62 44 59 10 20 10 50
brd 49 62 52 60 40 60 40 90
hyr 49 61 54 65 50 60 70 100
asx 47 59 52 61 30 60 60 100

Dlh watches warnings advisories
Wi... Beach hazards statement until 8 pm cdt this evening for wiz001.

Mn... Beach hazards statement until 8 pm cdt this evening for mnz037.

Ls... Small craft advisory until 4 pm cdt this afternoon for lsz144-

Short term... Dap
long term... Jjm
aviation... Jjm

Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
KGNA 26 mi28 min 2.9 55°F 1017.5 hPa48°F
GD5 - 9099090 - Grand Marais, MN 26 mi42 min 54°F 57°F1017.3 hPa51°F
ROAM4 - Rock of Ages, MI 30 mi24 min NE 8.9 G 9.9 55°F 1019.2 hPa (-1.4)
45006 - W SUPERIOR 48NM North of Ironwood, MI 37 mi34 min E 7.8 G 12 54°F 62°F2 ft1017.2 hPa (-1.1)
DISW3 - Devils Island, WI 71 mi24 min ESE 11 G 12 55°F 1017.3 hPa (-1.0)50°F

Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Grand Marais, The Bay of Grand Marais, MN26 mi28 minVar 3 mi55°F48°F77%1017.5 hPa

Wind History from GNA (wind in knots)
Last 24hrN445N5NE8NE9E10
1 day ago4E4NE4NE3CalmCalmCalmCalmCalmCalmCalmCalmW3W5W8SW34355--443
2 days agoNE7E8NE10NE10

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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Wind Forecast for Duluth, MN (17,4,5,8)
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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.