Tuesday, August20, 2019 L-36.com


Marine Weather and Tides
Lawrence, MI

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 6:53AMSunset 8:37PM Tuesday August 20, 2019 11:44 PM EDT (03:44 UTC) Moonrise 10:21PMMoonset 10:39AM Illumination 70% Phase: Waning Gibbous; Moon at 20 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
LMZ844 St Joseph To South Haven Mi- 1005 Pm Edt Tue Aug 20 2019
Rest of tonight..West winds 5 to 10 knots. Partly cloudy with a slight chance of showers and Thunderstorms. Areas of fog. Waves around 1 foot.
Wednesday..West winds 10 to 20 knots veering north 20 to 25 knots late in the day. Partly Sunny with a slight chance of showers and Thunderstorms. Waves 1 to 2 feet building to 3 to 5 feet.
Wednesday night..North winds 15 to 20 knots decreasing to 5 to 15 knots late at night, then veering east toward daybreak. Partly cloudy. Waves 2 to 4 feet.
Thursday..East winds 5 to 10 knots backing north 10 to 15 knots. Mostly Sunny. Waves around 1 foot.
Thursday night..Northeast winds 10 to 15 knots. Mostly clear. Waves 1 to 2 feet.
Friday..Northeast winds 10 to 15 knots. Sunny. Waves around 1 foot.
Saturday..East winds 5 to 15 knots. Sunny. Waves 1 foot or less.
Sunday..South winds 10 to 15 knots. Mostly Sunny. Waves 1 foot or less.
LMZ844 Expires:201908210900;;960248 FZUS53 KGRR 210205 NSHGRR Nearshore Marine Forecast National Weather Service Grand Rapids MI 1005 PM EDT Tue Aug 20 2019 For waters within five nautical miles of shore on Lake Michigan LMZ844-210900-


7 Day Forecast for Marine Location Near Lawrence, MI
   Hourly   EDIT   Help
location: 42.23, -86.09     debug


Area Discussion for - Grand Rapids, MI
      (on/off)   Help   NOTE: mouseover dotted underlined text for definition
Fxus63 kgrr 202315
afdgrr
area forecast discussion
national weather service grand rapids mi
715 pm edt Tue aug 20 2019
latest update...

aviation

Synopsis
Issued at 327 pm edt Tue aug 20 2019
- threat for strong to severe storms this afternoon and evening.

- isolated showers storms both tonight into Wednesday.

- dry weather Wednesday night through at least Sunday.

- cooler weather forecast Thursday through Saturday.

Discussion (this evening through next Tuesday)
issued at 327 pm edt Tue aug 20 2019
first concern in the 7 day forecast is the threat of thunderstorms
this afternoon and evening. Severe weather remains possible given
the amount of instability in place. MUCAPE values over the
southern 2 3rds of the forecast area remain in excess of 3000 j kg
with li's of -10c. So, plenty of instability is in place. Shear
remains lacking with 0-6km values less than 30 knots. So far the
warm sector cores have gone up modestly across the area but have
not reached severe levels. We are interested to see what happens
when the gust front associated with the MCV earlier convection
over illinois moves into an unstable air mass over the southwest
cwa. We should see convection grow upscale as this broken line of
showers and storms comes off the lake an into areas southwest of
grr. Showers and storms are likely late this afternoon and evening
as the MCV gust front moves east across our area. Cannot rule out
some severe weather with damaging winds and large hail being the
main threats.

Isolated to scattered showers and storms will remain possible
tonight and into much of Wednesday as it takes until late in the
day before the front progresses south of the forecast area. A
stronger storm or two will be possible from grr to the south and
east from the midday hours of Wednesday through the afternoon.

Wednesday night through Sunday looks to be dry with a slow moving
surface high pressure system moving through the area. Highs
Thursday through Saturday only look to top out in the 70s with
850mb temperatures in the +5c to +10c range.

Next chances for rain come out in the Monday Tuesday time frame of
next week when a cold front presses in from the west.

Aviation (for the 00z tafs through 00z Wednesday evening)
issued at 711 pm edt Tue aug 20 2019
scattered showers and thunderstorms diminishing from west to east
rapidly since 2200 utc. Any remnant showers should end by 0000 utc
so will leave all west michigan tafs dry tonight. Concerned about
fog development overnight. Inherited tafs show visibilities
falling to around 2sm around sunrise... Which appears reasonable.

Additional showers and possibly a few thunderstorms may develop
after 15z Wednesday as cold front pushes through area.

Marine
Issued at 327 pm edt Tue aug 20 2019
holding off on headlines for now, but am concerned about a period
of higher waves Wednesday starting up north near ludington at 11am
and working south through the course of the day. 3-5 footers look
quite possible with our local glerl model run off of the namnest
winds showing a few 6 footers. The waves drop below 4 feet via
this model run near south haven around midnight tomorrow night.

So, the time frame of concern is roughly noon on Wednesday to
midnight.

Winds will generally be on the light side through Wednesday
morning with waves remaining low as well through that time.

Grr watches warnings advisories
Mi... None.

Lm... None.

Synopsis... Duke
discussion... Duke
aviation... Mws
marine... Duke


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
SVNM4 - South Haven, MI 16 mi44 min SW 4.1 G 5.1 74°F
45168 17 mi34 min WSW 5.8 G 5.8 74°F 74°F1 ft1014.4 hPa68°F
SJOM4 - St. Joseph, MI 23 mi44 min Calm G 2.9 72°F 1015.6 hPa (+2.4)
45026 - St. Joseph, MI 33 mi34 min SSE 3.9 G 3.9 74°F 76°F1 ft1014.4 hPa68°F
HLNM4 - 9087031 - Holland, MI 38 mi56 min SW 6 G 7 73°F 1013.6 hPa72°F
45029 47 mi34 min W 3.9 G 5.8 73°F 73°F1 ft1013.8 hPa69°F
MCYI3 - Michigan City, IN 56 mi44 min SE 1.9 G 2.9 73°F 69°F

Wind History for Holland, MI
(wind in knots)    EDIT      (on/off)   Help
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
9
PM
10
PM
11
PM
Last
24hr
E4
E6
E6
E6
NE7
E6
E8
E7
E8
E6
E4
S7
S7
S5
S7
SE2
W12
SW23
G28
SW13
N10
G13
NE4
G7
--
NW1
SW8
1 day
ago
W8
W12
NW9
NW4
SW3
S4
SW4
S1
NW4
N4
E2
S6
SW7
SW6
SW6
W7
W6
NW5
N6
N4
N2
NE2
E4
2 days
ago
E3
E4
E3
S7
SE6
S7
SE6
G9
SE9
SE6
G9
SE10
G13
SE9
G14
S23
G35
S5
G9
SE9
G13
SE16
G21
S16
G22
W16
SW10
SW6
SW8
SW5
W8
NW6
W2

Airport Reports
    EDIT      (on/off)   Help   Click EDIT to display multiple airports. Follow links for more data.
AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
South Haven, South Haven Area Regional Airport, MI12 mi49 minN 010.00 miPartly Cloudy69°F68°F100%1014.9 hPa
Southwest Michigan Regional Airport, MI20 mi51 minSSW 410.00 miPartly Cloudy71°F66°F87%1014 hPa

Link to 5 minute data for KLWA

Wind History from LWA (wind in knots)
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
9
PM
10
PM
11
PM
Last 24hrCalm------CalmCalmCalmCalmCalmCalm--S3CalmCalmSW3SW4SW3W14
G24
N4CalmN3CalmCalmCalm
1 day agoCalmCalmCalmCalmCalm--CalmCalmCalmCalmCalmCalmCalmCalmCalmW3W5NW3CalmCalmNW3CalmCalmCalm
2 days agoCalmCalmCalmCalmCalmCalmCalmCalmS3S4S7SE4W7
G14
CalmS6S8S9
G15
SW7W8NW5NW4W3CalmCalm

Tide / Current Tables for
   EDIT   Weekend mode (on/off)   (on/off)   Help
Tide / Current Tables for
   EDIT      (on/off)   Help
Weather Map and Satellite Images
       (on/off)   HelpWeather Map
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 Grand Rapids, MI (23,6,7,8)
      (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.