Tuesday, May30, 2017 L-36.com


Marine Weather and Tides
Grand Marais, MN

Version 3.4
What's New / NOTES
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 5:58AMSunset 9:51PM Tuesday May 30, 2017 5:15 AM EDT (09:15 UTC) Moonrise 10:30AMMoonset 12:31AM Illumination 23% Phase: Waxing Crescent; Moon at 5 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
    EDIT      (on/off)   Help
This is a Weather Statement Zone, please check the Date to see if it has expired
LSZ140 903 Pm Cdt Fri May 26 2017
.a strong Thunderstorm 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... At 903 pm cdt...doppler radar indicated a strong Thunderstorm... Capable of producing winds to around 30 knots and small hail. This strong Thunderstorm was located 15 nm southeast of tofte safe harbor...or 31 nm southwest of horseshoe bay and safe harbor... Moving east at 25 knots. The strong Thunderstorm will remain over mainly open waters. 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 4734 8999 4720 9009 4717 9047 4766 9070 4769 9062 4781 9020
This is a Weather Statement Zone, please check the Date to see if it has expired
LSZ140 Expires:201705270230;;262245 FZUS73 KDLH 270203 MWSDLH MARINE WEATHER STATEMENT NATIONAL WEATHER SERVICE DULUTH MN 903 PM CDT FRI MAY 26 2017 LSZ140-141-162-270230-

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


Area Discussion for - Duluth, MN
      (on/off)   Help   NOTE: mouseover dotted underlined text for definition
Fxus63 kdlh 300848
afddlh
area forecast discussion
national weather service duluth mn
348 am cdt Tue may 30 2017

Short term (today through Wednesday)
issued at 347 am cdt Tue may 30 2017
at 330 am, skies were cloudy across the northland. Regional radar
shows scattered showers moving southward across the cwa, and
temperatures were generally in the 40s to around 50.

The focus for the weather over the next couple days will be the
potential for rain showers, along with temperature trends. An
upper level low over ontario will continue to affect the northland
weather today and tonight, before moving out of the region on
Wednesday. Today is shaping up to be another gray day, with
scattered rain showers across the region. A shortwave rotating
around the main upper low will swing south to southeast across the
western lake superior area today, before moving out of the area
later tonight and on Wednesday. The best chance of showers should
be in northern minnesota today.

For today, will carry highest pop's in the north, with rain
showers likely from the iron range northward. Scattered showers
are expected elsewhere. Highs will generally be limited to the
50s. The rain showers will decrease from west to east tonight,
with high pressure moving in on Wednesday. Lows tonight will range
from the upper 30s to lower 40s, with highs on Wednesday ranging
from the mid 60s to the lower 70s. There should be plenty of
sunshine across the area on Wednesday.

Long term (Wednesday night through Monday)
issued at 347 am cdt Tue may 30 2017
the extended fcst period looks to be overall fairly dry, with
temperatures returning to more seasonal values.

The long-term forecast period begins with Thursday and Friday
looking dry and warm, with highs ranging in the upper 60s and into
the 70s, with the coolest temperatures expected along lake superior.

An upper-level closed low is progged to remain situated over
northeast ontario canada, keeping the northland under the cyclonic
flow. The consensus blend low temperatures Wednesday night Thursday
morning seemed to be a bit too warm, seeing as we should see some
mostly clear skies and very light winds during this time to enhance
radiational cooling, so decreased the lows by a few degrees. Lows
during this time are expected to be in the lower to mid 40s. It's
still a bit too warm for any frost concerns, but any further
reduction in temperatures may lead to a mention of frost given the
favorable set up. A weak trough with some low-level isentropic
lift may support a brief rain shower over the minnesota arrowhead
region Thursday afternoon, but there is still a good bit of
disagreement between the synoptic models to put much stock into
that.

Chances of rain showers then develop Saturday morning through Sunday
night, which is the only decent shot at precipitation for the entire
long-term period. The main driver of these chances of precipitation
looks to be a mid-level shortwave, with an associated sfc warm
front. Lift looks to be pretty strong as the GFS model is
indicating some good isentropic lift with this shortwave. Pwat
values are also approaching one inch, so there could be some
wetting rainfall from these showers. The caveat is that there is
some disagreement between the gfs ECMWF cmc models at this point
regarding the timing and location of these rain showers. The ecmwf
and cmc are closer to agreement than the gfs, with the ecmwf
shifting the track of the sfc low a bit further north, leading to
higher confidence in the precipitation, especially across our
southern areas. So, did increase the pops along the southwestern
counties Saturday morning.

Monday and Tuesday next week look to be mostly dry, with only a few
scattered chances of a rain shower.

Aviation (for the 06z tafs through 06z Tuesday night)
issued at 1236 am cdt Tue may 30 2017
cyclonic flow both at the surface and aloft in with some weak
ripples in the flow will keep showers in the forecast for the
terminals through much of the upcoming period. A fresh surge of
colder air will bring another wave of MVFR and or ifr ceilings move
into the terminals from the north shortly, sweeping from north to
south through approximately 18z, with a brief improvement to at
least MVFR before another wave moves through after 18z. This
upper low is shifting off to the east and expect some improvement
for kinl and kbrd, with a possible improvement all the way toVFR
after 04z.

Preliminary point temps pops
Dlh 53 40 68 46 50 30 0 0
inl 54 38 70 43 60 30 0 0
brd 56 42 71 45 30 10 0 0
hyr 55 43 70 42 30 40 0 0
asx 55 43 67 44 50 30 0 0

Dlh watches warnings advisories
Wi... None.

Mn... None.

Ls... None.

Short term... Dap
long term... Jts
aviation... Le jts


Weather Reporting Stations
   EDIT       (on/off)   Help   NOTE: Click on distance to see the station location on a map
Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
KGNA 26 mi19 min WSW 6 47°F 1005.1 hPa40°F
GD5 - 9099090 - Grand Marais, MN 26 mi45 min 49°F 1004.8 hPa43°F
ROAM4 - Rock of Ages, MI 30 mi75 min W 21 G 21 49°F 1005.9 hPa (+0.0)
DISW3 - Devils Island, WI 71 mi75 min W 9.9 G 11 45°F 1007.2 hPa (+0.0)42°F

Airport Reports
    EDIT      (on/off)   Help   Click EDIT to display multiple airports
AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Grand Marais, The Bay of Grand Marais, MN26 mi19 minWSW 6 mi47°F39°F77%1005.1 hPa

Wind History from GNA (wind in knots)
5
AM
6
AM
7
AM
8
AM
9
AM
10
AM
11
AM
12
PM
1
PM
2
PM
3
PM
4
PM
5
PM
6
PM
7
PM
8
PM
9
PM
10
PM
11
PM
12
AM
1
AM
2
AM
3
AM
4
AM
Last 24hrCalmCalmCalmW3CalmCalmCalmW8W6W9W9
G16
W10
G21
W10
G17
W9
G19
W9
G14
5W8W6SW8W7W6W4SW9W6
1 day agoCalm3NW3E3NE4CalmE5W4W7W6CalmCalmSW4SW4W6SW5CalmCalmCalmNE5E4CalmCalmCalm
2 days agoCalmCalmW5SW8SW9W12SW9SW8SW10SW11SW9SW10SW7SW53CalmCalmCalmCalmCalmCalmCalmE3Calm

Tide / Current Tables for
   EDIT   RT Ports Option   Weekend mode (on/off)   (on/off)   Help
Tide / Current Tables for
   EDIT      (on/off)   Help
Weather Map and Satellite Images
       (on/off)   Help
Weather Map
wmap_A
IR Satellite Image from GEOS
east_satellite

GOES Local Image of GreatLakes    EDIT
Geos

Wind Forecast for Duluth, MN (5,6,7,8)
      (on/off)   Help

Ground Weather Radar Station Marquette, MI
   (on/off)   Help
weather_mapweather_map weather_map

Ad by Google

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.