Tuesday, October17, 2017 L-36.com


Marine Weather and Tides
Roosevelt Park, MI

Version 3.4
What's New / NOTES
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.
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 8:01AMSunset 6:59PM Tuesday October 17, 2017 8:19 PM EDT (00:19 UTC) Moonrise 4:34AMMoonset 5:21PM Illumination 6% Phase: Waning Crescent; Moon at 27 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
LMZ847 Grand Haven To Whitehall Mi- 357 Pm Edt Tue Oct 17 2017
.small craft advisory in effect through late Wednesday night...
Tonight..Southwest winds 15 to 25 knots. Clear. Waves 5 to 7 feet.
Wednesday..South winds 20 to 25 knots. Sunny. Waves 6 to 9 feet.
Wednesday night..Southwest winds 15 to 25 knots veering west toward daybreak. Mostly clear. Waves 6 to 9 feet.
Thursday..West winds 10 to 15 knots. Sunny. Waves 4 to 6 feet subsiding to 1 to 3 feet late in the day.
LMZ847 Expires:201710180315;;008039 FZUS53 KGRR 171957 NSHGRR Nearshore Marine Forecast National Weather Service Grand Rapids MI 357 PM EDT Tue Oct 17 2017 For waters within five nautical miles of shore on Lake Michigan LMZ847-180315-

7 Day Forecast for Marine Location Near Roosevelt Park, MI
   Hourly   EDIT   Help
location: 43.22, -86.36     debug


Area Discussion for - Grand Rapids, MI
      (on/off)   Help   NOTE: mouseover dotted underlined text for definition
Fxus63 kgrr 172248
afdgrr
area forecast discussion
national weather service grand rapids mi
648 pm edt Tue oct 17 2017
latest update...

aviation

Synopsis
Issued at 305 pm edt Tue oct 17 2017
the rest of the week looks quiet with increasing temperatures
especially for Friday and Saturday, with low 70s expected. These
temperatures are 10 to 15 degrees above normal for mid to late
october. Plenty of sunshine is anticipated for much of the week.

The next chance for showers looks to hold off until later Saturday
into Sunday.

Short term (this evening through Thursday night)
issued at 305 pm edt Tue oct 17 2017
quiet conditions expected in the short term. Medium range model
guidance is indicating an h500 shortwave moving through on
Wednesday which will provide a subtle shift from the SW flow
pattern today and Wednesday to a more westerly flow and slightly
cooler temps advecting in at h850. This translates to a slight
drop in temps on Thursday by a few degrees, especially near and
north of i-96.

In terms of cloud cover, we are expecting a good amount of
sunshine with some intervals of high clouds possible, mainly on
Thursday morning, looking at the GFS h250 rh. Other than this, the
skies will be mostly sunny to completely clear.

Winds on Wednesday will not be as strong as today, at least for
inland locations. Expecting MAX gusts of 20 to 25 mph with the
highest wind gusts likely across west central lower mi with h850
llj core moving overhead.

Long term (Friday through Tuesday)
issued at 305 pm edt Tue oct 17 2017
three distinct time frames of similar weather in the long term. The
first is a warmer and mainly dry period from Friday through
Saturday. Saturday night through Sunday night should feature a band
of rain showers moving through the great lakes region along a cold
frontal passage. Finally Monday into Tuesday will feature cold air
advection and lake effect rain showers at times.

Friday through Saturday looks mainly dry in the southerly warm air
advection ahead of the front. There are some timing differences with
the front with the GFS and the canadian being faster than the ecmwf.

The ECMWF is about 12 hours slower with the frontal passage. We look
to be 10-15 degrees above normal for highs which will be in the
lower 70s.

Saturday night through Sunday night the band of rain showers will be
working through the area with Saturday night and Sunday being the
periods with the best chances for rain. Sunday will be cooler with
highs in the 60s due to the clouds and precipitation.

Monday into Tuesday we should see lake effect rain showers develop
as delta t's over lake michigan increase into the upper teens c on
Tuesday. Monday night and Tuesday look to be the best chances for
lake precip as the upper trough will be overhead. Highs by next
Tuesday look to be below normal in the lower 50s.

Aviation (for the 00z tafs through 00z Wednesday evening)
issued at 640 pm edt Tue oct 17 2017
high confidence thatVFR conditions will continue through
Wednesday evening. Southwest winds will increase to around 15 kts
with frequent gusts to near 25 kts from late Wednesday morning
through Wednesday afternoon. Winds will subside somewhat Wednesday
evening.

Marine
Issued at 305 pm edt Tue oct 17 2017
decided to upgrade the SCA to a gale warning on Wednesday from
whitehall north based on updated wind guidance from high res
models. The timing of the gales will likely hold off until mid to
late afternoon Wednesday for this region. Further south, gales are
not anticipated and will go ahead and extend the SCA through 08z
Thursday to match up the end time of the gale warning.

Nevertheless, a rough chop is expected on the lake with 5 to 8
foot waves common into Wednesday and early Thursday morning.

Hydrology
Issued at 305 pm edt Tue oct 17 2017
most of the area rivers have reached their peak from the heavy
rainfall event over the weekend. The exception is the kalamazoo
river at new richmond... Which should reach its crest early
Wednesday before returning below bankfull stage early Thursday.

High pressure will continue to dominate the area weather through
Wednesday... With a dry frontal passage expected Thursday. The next
significant rain event is not expected until later Saturday into
Sunday... When a stronger frontal system moves through the region.

The dry weather will allow area rivers to return to typical flows
for late october.

Grr watches warnings advisories
Mi... None.

Lm... Small craft advisory until 2 pm edt Wednesday for lmz848-849.

Gale warning from 2 pm Wednesday to 4 am edt Thursday for lmz848-
849.

Small craft advisory until 4 am edt Thursday for lmz844>847.

Synopsis... Hoving
short term... Hoving
long term... Duke
aviation... Laurens
hydrology... Mws
marine... Hoving


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
MKGM4 - Muskegon, MI 1 mi29 min SW 18 G 20 62°F 1018.6 hPa55°F
45161 3 mi79 min SSW 16 G 19 63°F 60°F5 ft1018.2 hPa (-0.9)
45029 23 mi39 min SW 18 G 23 63°F 61°F6 ft1018.8 hPa53°F
HLNM4 - 9087031 - Holland, MI 32 mi49 min S 18 G 20 62°F 1018.6 hPa54°F
LDTM4 - 9087023 - Ludington, MI 50 mi49 min S 8 G 12 62°F 51°F

Wind History for Holland, MI
(wind in knots)    EDIT      (on/off)   Help
8
PM
9
PM
10
PM
11
PM
12
AM
1
AM
2
AM
3
AM
4
AM
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
Last
24hr
SE6
G9
SE6
G9
SE6
G10
S11
G14
S9
G12
S9
G13
SW17
SW17
G22
SW18
SW18
S17
G22
S23
S23
G28
S23
G28
S24
G29
S24
S22
G27
S23
S17
G22
S20
S21
S19
G23
S19
S18
1 day
ago
N8
G11
NE5
G12
NE6
NE6
NE3
NE7
G10
E6
SE5
G8
E4
E4
SE5
E7
E6
G9
E7
G10
E8
E4
S5
G8
W10
G14
SW9
G12
SW9
G12
SW10
SW9
G12
S11
S11
G14
2 days
ago
SE12
G18
SE13
G16
SE13
G17
SE15
G21
SE15
G22
SE11
G16
S18
G24
S22
S29
S20
S18
S21
G27
S19
G24
W30
W26
W28
W26
NW26
NW29
G36
NW27
G34
NW26
G33
N24
G29
N16
G25
N10

Airport Reports
    EDIT      (on/off)   Help   Click EDIT to display multiple airports
AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Muskegon, Muskegon County Airport, MI6 mi25 minSSW 910.00 miMostly Cloudy62°F51°F67%1019.1 hPa

Wind History from MKG (wind in knots)
9
PM
10
PM
11
PM
12
AM
1
AM
2
AM
3
AM
4
AM
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
Last 24hrSE7S7SE4SW8SW9SW14SW11
G21
SW11SW12SW11SW15SW16
G25
SW15
G26
SW14
G21
SW16
G24
SW15
G22
SW14
G22
SW18SW17SW15
G21
SW16
G23
S12S11S9
1 day agoN4CalmN6SE4E3SE4CalmE5NE3E3E4E5SE6E5SE6S5W10W10W10SW11SW9SW7S5Calm
2 days agoS11S12
G17
S15S10
G19
SE11S15
G24
S16
G27
S22
G30
S21
G29
S17
G33
SW21
G26
SW17
G30
W16
G28
NW13
G18
W14
G25
W15
G26
NW22
G30
N18
G28
NW18
G25
NW15
G22
N11
G20
N9N11
G17
N6

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 Grand Rapids, MI (20,4,5,8)
      (on/off)   Help

Ground Weather Radar Station Grand Rapids/Muskegon, 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.