Friday, June22, 2018 L-36.com


Marine Weather and Tides
Grand Haven, MI

Version 3.4
What's New / NOTES
5/20/2018 -- NOAA is having problems with the data feed that I use to draw the graphs. They are aware of the issue and working to resolve it. Sometimes changing the location by about a mile will give a correct graph. 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.

Sunrise 6:04AMSunset 9:30PM Friday June 22, 2018 10:37 PM EDT (02:37 UTC) Moonrise 3:09PMMoonset 2:01AM Illumination 72% Phase: Waxing Gibbous; Moon at 10 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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LMZ846 Holland To Grand Haven Mi- 934 Pm Edt Fri Jun 22 2018
Rest of tonight..Northeast winds 5 to 15 knots. Cloudy with scattered rain showers. Waves around 1 foot.
Saturday..Northeast winds 5 to 10 knots backing west, then veering northwest 10 to 15 knots late in the day. Mostly cloudy with a slight chance of rain showers. Waves 1 to 2 feet.
Saturday night..Northwest winds around 10 knots. Mostly cloudy. A slight chance of rain showers overnight. Waves 1 to 2 feet.
Sunday..North winds around 10 knots. Partly Sunny. Waves around 1 foot.
LMZ846 Expires:201806230915;;960950 FZUS53 KGRR 230134 NSHGRR Nearshore Marine Forecast National Weather Service Grand Rapids MI 934 PM EDT Fri Jun 22 2018 For waters within five nautical miles of shore on Lake Michigan LMZ846-230915-

7 Day Forecast for Marine Location Near Grand Haven, MI
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location: 43.05, -86.36     debug


Area Discussion for - Grand Rapids, MI
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Fxus63 kgrr 230158
afdgrr
area forecast discussion
national weather service grand rapids mi
958 pm edt Fri jun 22 2018
latest update...

update

Synopsis
Issued at 330 pm edt Fri jun 22 2018
showers and a small chance of a thunderstorm will persist into this
evening for areas mainly along and south of i-96. Rain chances will
then diminish overnight. Additional showers will develop over inland
locations on Saturday with an outside chance of a rumble of thunder.

Additional showers will remain possible across the north Saturday
night and early Sunday before they come to an end.

A dry day is expected on Monday as we will be in between systems.

Another good chance of rain will move back in for Tuesday and linger
into Wednesday.

Update
Issued at 958 pm edt Fri jun 22 2018
showers have diminished in coverage intensity this evening and
only scattered light showers will remain for the rest of the
night. Will carry pops below 50 pct overnight and no mention of
thunder. Have maintained patchy fog mention although best risk of
that is southeast of grr closer to the track of the sfc low and
the higher sfc dew pts.

Short term (this evening through Sunday night)
issued at 330 pm edt Fri jun 22 2018
our main focus of the short term is dealing with rain trends and
convective chances through Sunday.

Band of showers continues to persist south of i-96 this afternoon,
moving a little slower than expected to the north. This is likely
due to the fact that dry air continues to eat away at the rain where
it is light enough. Where it is raining, some heavier downpours are
definitely still occurring. We are expecting the rain to diminish in
coverage and move NE as the entire upper low opens up and begins to
lift to the ne. The thunder chance will remain probably into mid-
evening, before we lose the limited diurnal instability available
with the abundant cloud cover.

We are expecting most areas to see mainly dry conditions for the
first portion of the day. There will be a couple renegade showers
lingering in the morning. During the afternoon hours, we will see a
lingering sfc trough over the area become enhanced some as the
inland areas warm up some and lake breezes form. The models are in
good agreement in setting up a sfc trough convergence band near u.S.-
131 and then turning toward the sfc low near detroit. These will be
mainly showers with little heating with plenty of clouds in place.

There could be just enough for an isolated storm, especially across
the south.

The showers from the diurnally enhanced trough on Sat will diminish
sat evening. Additional showers will become possible across the
north Sat night as yet another short wave moves across central and
northern lower. The showers will linger into Sun morning, before the
wave moves out Sun afternoon and clearing takes place.

Long term (Monday through Friday)
issued at 330 pm edt Fri jun 22 2018
next week will start off dry with high pressure in place on Monday
both at the surface and aloft. The week become a bit more active
fairly quick with the chance for showers moving in late Monday
night. The showers are associated with an upper low moving through a
progressive pattern across the northern tier of states. This upper
low will move through the great lakes region Tuesday and Wednesday
bringing a fair amount of rainfall. Thunderstorms are quite possible
given some instability as dew points rise back up into the 60s ahead
of the system.

A brief respite from rainfall will come Wednesday night into
Thursday before another round of showers and storms potentially as a
warm front lifts into the area Thursday night and Friday. Saturday
we may transition into the warm sector with a southwest flow taking
shape.

The general trend on temperatures will be to above normal as 500mb
heights rise through the period. The forecast has upper 80s by the
end of the week.

Aviation (for the 00z tafs through 00z Saturday evening)
issued at 754 pm edt Fri jun 22 2018
ceilings are expected to gradually lower tonight from south to
north as the sfc low over indiana heads toward southeast lwr mi.

Most areas should eventually go ifr overnight with perhaps the
exception of muskegon. The lowest conditions are forecast to
occur south and east of grr where a period of lifr CIGS is even
likely from roughly 09z to 14z. Some light fog, producing vsbys of
2-4sm, is likely overnight but the coverage of any showers should
remain quite limited. Look for CIGS to gradually lift to
predominately MVFR levels Saturday afternoon with the risk of a
few showers continuing.

Marine
Issued at 330 pm edt Fri jun 22 2018
we do not anticipate marine headlines being needed over the next few
days. A general offshore flow will continue for the nearshore waters
through much of the weekend. It will be a bit breezy the remainder
of today into tonight. The flow looks to be light enough Saturday
and Sunday that a lake breeze will develop in the afternoon and
early evening hours for a few hours.

Hydrology
Issued at 1108 am edt Thu jun 21 2018
river levels are running near normal, and are steady or slowly
falling. No flooding is expected.

Periods of rain will be possible today through Saturday. Scattered
to numerous showers and thunderstorms may develop. Generally expect
less than an inch of rain, with locally heavy rainfall possible with
the storms. This may result in localized flooding where storms form
and train over the same locations.

Grr watches warnings advisories
Mi... None.

Lm... None.

Update... Meade
synopsis... Njj
short term... Njj
long term... Duke
aviation... Meade
hydrology... 63
marine... Njj


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
45161 9 mi38 min E 12 G 14 70°F
45029 11 mi38 min ENE 7.8 G 9.7 68°F 67°F1 ft1006.8 hPa (+0.7)58°F
MKGM4 - Muskegon, MI 12 mi38 min E 8 G 11 70°F 1006.9 hPa (+0.6)56°F
HLNM4 - 9087031 - Holland, MI 21 mi56 min NNE 4.1 G 6 66°F 1006.4 hPa61°F
45007 - S MICHIGAN 43NM East Southeast of Milwaukee, WI 44 mi48 min NE 9.7 G 14 63°F 64°F2 ft1007.2 hPa (-0.0)60°F
SVNM4 - South Haven, MI 45 mi38 min NE 8.9 G 9.9 65°F
45168 45 mi38 min ENE 7.8 G 9.7 65°F 64°F1 ft1006.7 hPa (+0.2)58°F
LDTM4 - 9087023 - Ludington, MI 62 mi50 min ENE 4.1 G 6 72°F 51°F

Wind History for Holland, MI
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Muskegon, Muskegon County Airport, MI10 mi43 minENE 910.00 miOvercast71°F52°F51%1007.2 hPa

Wind History from MKG (wind in knots)
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Last 24hrE14
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1 day agoN4CalmNE5E3CalmSE4CalmNE3E3E7E9E12
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2 days agoNE8NE7NE8E8E11E8E11E10NE10E8E8E9E8NE6E8E8NE6W4E6W8NW6W4W3--

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 Grand Rapids, MI (22,6,7,8)
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Ground Weather Radar Station Grand Rapids/Muskegon, MI
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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.