Friday, August23, 2019 L-36.com


Marine Weather and Tides
Grand Marais, MN

Version 3.4
NOTICE
7/25/2019 New feature in the Airports section gives a link to 5 minute updates for data reports.
6/2/2019. Many thanks to a user for reporting an error on one of the Edit pages. The switch to PHP 7.2 caused many pages that previously worked to quit working. I fixed many but I still depend on users to report ones I missed. Please report errors HERE or send an email to me at L-36.com. Allen

Sunrise 7:00AMSunset 8:59PM Friday August 23, 2019 7:12 AM EDT (11:12 UTC) Moonrise 11:51PMMoonset 2:16PM Illumination 46% Phase: Third Quarter Moon; Moon at 23 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 937 Pm Cdt Sun Aug 4 2019
.an area of Thunderstorms approaching 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... At 937 pm 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 20 nm north of tofte safe harbor, to 9 nm northwest of tofte, to 27 nm northwest of beaver bay, moving east at 20 knots. Locations impacted include... Beaver bay, mouth of the cross river, split rock bay, castle danger, sugar loaf cove, horseshoe bay and safe harbor, tofte safe harbor, twin points safe harbor, and tofte. 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 4787 8962 4740 9020 4694 9141 4705 9166 4758 9088 4772 9055 4790 8985
LSZ140 Expires:201908050330;;132970 FZUS73 KDLH 050237 MWSDLH Marine Weather Statement National Weather Service Duluth MN 937 PM CDT Sun Aug 4 2019 LSZ140>143-162-050330-


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 230916
afddlh
area forecast discussion
national weather service duluth mn
416 am cdt Fri aug 23 2019

Short term (today through Saturday)
issued at 416 am cdt Fri aug 23 2019
upper level ridging will build across the forecast area early this
morning, while surface ridging is already in place over western lake
superior. With a light wind and clear sky, areas of fog have formed.

Expect the fog to cover a larger portion of the region before
sunrise and have adjusted accordingly. The fog should erode shortly
after sunrise. A mainly sunny sky is forecast due to the nearby
high. MAX temps will reach the 70s, with 60s along the north shore
of lake superior.

The aforementioned ridging drifts ever so slowly east through
Saturday, but remains close enough to keep a dry forecast. Low level
moisture will be on the increase tonight as a southerly flow begins
and expect clouds to affect the area. Will leave out a mention of
fog tonight as a result. The clouds will linger for most of the day
Saturday before dissipating late. MAX temps should reach the 70s,
except along the north shore of lake superior.

Long term (Saturday night through Thursday)
issued at 416 am cdt Fri aug 23 2019
an upper trough will sag south over western canada as a
ridge over the great lakes region slides eastward. On Sunday into
Monday, the trough digs into the northern plains as a surface low
over manitoba and its associated cold front become more organized
and move northeastward. This will spread showers and thunderstorms
eastward across the northland Sunday into early next week. Severe
weather is not anticipated with these thunderstorms due to weak
instability and limited shear. Also, the southwest flow aloft and
low-level southerly flow will help usher in high precipitable water
values Sunday into Monday. This could lead to the potential for much
of the region to see 1-2 inches of rain. Then, the surface low will
slowly track and stall over ontario advecting cooler air for most of
next week resulting in below average temperatures for the region.

Due to cyclonic flow and cold air advection, scattered showers will
linger over the northland on Tuesday into Wednesday.

Aviation (for the 06z tafs through 06z Friday night)
issued at 1229 am cdt Fri aug 23 2019
light winds and clear skies will create ideal conditions for fog
once again tonight. Hib has already dropped to 1 4 sm briefly and
expect a similar up-and-down trend in visibility there and at most
terminals through the night. The remaining terminals could all see
fog overnight, bringing visibilities down to MVFR and quite possibly
ifr or worse at times. This is according to current conditions and
also most short range and MOS lamp guidance suggesting it. Most
guidance keeps brdVFR through the night, and since they have
remained warmer than sites further east, decided to keep themVFR
but mention a slight possibility of mist. Fog will lift through the
morning hours yielding mostly sunny skies under high pressure at
all sites on Friday. Some model guidance is suggesting that fog may
be an issue Friday night as well.

Marine
Issued at 416 am cdt Fri aug 23 2019
as high pressure centers over lake superior, east northeast flow
will accelerate over western lake superior on Friday. Borderline
small craft conditions will be possible across the western tip of
lake superior this afternoon. Wind speeds will range from 15-20
knots with gusts between 18-22 knots and occasional 3 feet waves.

Elsewhere, speeds of 5-15 knots can be expected with waves 2 feet or
less. Expect winds to decrease Friday evening into Saturday as the
high slides further east and winds shift to the south.

Preliminary point temps pops
Dlh 71 51 74 54 0 0 0 0
inl 75 50 78 57 0 0 0 20
brd 76 55 78 58 0 0 0 10
hyr 75 50 75 52 0 0 0 0
asx 72 48 77 54 0 0 0 0

Dlh watches warnings advisories
Wi... None.

Mn... None.

Ls... None.

Short term... Gsf
long term... Kc
aviation... Js
marine... Kc


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
GD5 - 9099090 - Grand Marais, MN 26 mi61 min 47°F 51°F1024.3 hPa47°F
KGNA 26 mi77 min NNW 2.9 46°F 1024.5 hPa44°F
ROAM4 - Rock of Ages, MI 30 mi73 min N 5.1 G 5.1 55°F 1026.2 hPa (+1.2)
45006 - W SUPERIOR 48NM North of Ironwood, MI 37 mi83 min NNE 1.9 G 1.9 60°F 63°F1023.7 hPa (+0.9)
DISW3 - Devils Island, WI 71 mi73 min SE 6 G 8 60°F 1024.2 hPa (+1.1)53°F

Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Grand Marais, The Bay of Grand Marais, MN26 mi77 minNNW 3 mi46°F44°F93%1024.5 hPa

Link to 5 minute data for KGNA

Wind History from GNA (wind in knots)
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Last 24hrCalmSE3CalmCalm3CalmE3CalmCalmCalmCalmCalmCalmCalmCalmCalmN4NW4NW5NW3N3N4NW3Calm
1 day agoNW5----3344NW9
G18
3554--CalmN5N6N74CalmNE6CalmNW3CalmNW3
2 days agoN4CalmW4CalmCalmW3W6W7SW6W53CalmCalmNW3NW4NW4NW4NW3NW4NW5NW8N8NW7NW5

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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wmap_A
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.
Link to Loop

Other links: Northern Pacific     Contential US     Full GOES-East
Wind Forecast for Duluth, MN (7,2,3,4)
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Ground Weather Radar Station Marquette, MI
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weather_mapweather_map weather_map

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Disclaimer:
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.