Tuesday, October19, 2021
Privacy Policy
L-36.com

Marine Weather and Tides
Grand Rapids, MI

Version 3.4
NOTICE
3/30/2021 -- ANZ330 has been split into ANZ331 and ANZ332. Click EDIT in Marine Forecast and select your new zone.
1/26/2021 -- The West Coast Satellite images havd been updated. They now use GEOS-17.
1/1/2021 -- The 7 day forecast are now working well. Thank you NOAA for your support.

Sunrise 8:00AMSunset 6:54PM Tuesday October 19, 2021 4:49 PM EDT (20:49 UTC) Moonrise 5:49PMMoonset 5:49AM Illumination 98% Phase: Waxing Gibbous; Moon at 14 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
LMZ846 Holland To Grand Haven Mi- 405 Pm Edt Tue Oct 19 2021
.small craft advisory in effect through Wednesday morning...
Through early evening..Southwest winds around 15 knots. Sunny. Waves 2 to 4 feet.
Tonight..Southwest winds 15 to 20 knots. Partly cloudy. Waves 2 to 3 feet.
Wednesday..South winds 10 to 20 knots. Mostly Sunny with a chance of rain showers. Waves 2 to 3 feet.
Wednesday night..South winds 15 to 25 knots veering southwest toward daybreak. Rain showers and a chance of Thunderstorms. Waves 1 to 2 feet building to 3 to 5 feet after midnight.
Thursday..West winds around 20 knots veering northwest. Mostly cloudy with a chance of showers and Thunderstorms. Waves 4 to 6 feet.
Thursday night..North winds 10 to 20 knots veering northeast around 10 knots toward daybreak. Partly cloudy. Waves 3 to 5 feet subsiding to 1 to 3 feet toward daybreak.
Friday..Northeast winds around 10 knots backing northwest. Mostly cloudy. Waves 1 to 2 feet.
Saturday..North winds 5 to 15 knots. Mostly Sunny. Waves around 1 foot.
Sunday..East winds 10 to 15 knots. Mostly cloudy with a chance of rain showers. Waves 1 foot or less.
LMZ846 Expires:202110200800;;944027 FZUS53 KGRR 192006 NSHGRR Nearshore Marine Forecast National Weather Service Grand Rapids MI 405 PM EDT Tue Oct 19 2021 For waters within five nautical miles of shore on Lake Michigan LMZ846-200800-


7 Day Forecast for Marine Location Near Grand Rapids, MI
   Hourly   EDIT   Help
location: 42.95, -85.67     debug


Area Discussion for - Grand Rapids, MI
      (on/off)   Help   NOTE: mouseover dotted underlined text for definition
FXUS63 KGRR 191931 AFDGRR

Area Forecast Discussion National Weather Service Grand Rapids MI 331 PM EDT Tue Oct 19 2021

LATEST UPDATE . Synopsis/Discussion/Marine

SYNOPSIS. Issued at 322 PM EDT Tue Oct 19 2021

- Quiet weather again tonight

- Showers, few thunderstorms for late Wed into Thu

- Seasonably cooler weather for Fri into the weekend

- Somewhat active weather for next week

DISCUSSION. (This evening through next Tuesday) Issued at 322 PM EDT Tue Oct 19 2021

- Quiet weather again tonight

Another sunny and unseasonably warm day has passed for much of the region today. The broad surface anticyclone over the southern Appalachians will move off the coast tonight. To our west, recent lee cyclogenesis has yielded a 1005-mb surface cyclone, having now reached southwestern Nebraska. A closed mid/upper-level low and associated vort maximum is noted in WV-channel imagery across NW Colorado, associated with somewhat modest 500-mb height falls of 60 m per 12 h, as shown in RAP mesoanalysis. The northward return of low-level moisture has been somewhat delayed, owing to the aforementioned anticyclone over the gulf states, but is nevertheless underway across the plains. Another fairly quiet night is expect under some passing high clouds, with warmer low temps than previous nights.

- Showers, few thunderstorms for late Wed into Thu

For Wed, our attention turns to this aforementioned system and its associated impacts. HREF ensemble mean suggests the surface cyclone will reach the vicinity of central Lower Michigan by 12z Thu, with a trailing cold front to its south. In advance of this cold front, low 50s F surface dewpoints should be common in the area (dewpoints currently near 50F inland are noted), and PWAT will climb to 1.0-1.2 inches. Aloft, an elevated mixed layer-- recently transported from the Rockies--may glance southern Michigan, perhaps providing 700-500-mb lapse rates of 7 C/km in our southern counties by late Wed night. This environment is expected to yield 500-1000 J/kg of MUCAPE--mainly along/south of I-96--for tomorrow night, per HREF mean. Effective bulk shear of 20-30 kt is expected--not terribly impressive--and SW Lower Michigan is positioned on the nose of a 35-kt LLJ. QG forcing for ascent increases considerably for Wed night/early Thu morning, as manifest by 850-400-mb Q-vector convergence downshear of compact midlevel vort max.

Overall, we will carry likely PoPs for many areas on Wed night, with thunder also possible, particularly across our central/southern counties. Organized severe thunderstorms are not expected (see also SPC day-2 outlook), but the proximity of the aforementioned steep midlevel lapse rates and LLJ suggest that some transient stronger storms are possible with elevated convection. Heavy rainfall is not a major concern, given the fairly progressive motion of this system, and HREF ensemble-max QPF generally stays below 1 inch through 12z Thu.

- Seasonably cooler weather for Fri into the weekend

Precip coverage will generally taper away after 12z Thu as subsidence arrives behind departing wave. Modest low-level cold advection will commence for Thu afternoon and persist through Fri morning, with the 850-mb 0C isotherm may reach southern Lake Michigan. A good deal of cloudiness should linger on Friday, especially for the lakeshore counties. Moreover, recent deterministic GFS runs suggest a fast-moving shortwave trough and associated vort max may clip our southwestern counties on Fri evening, with another bout of modest cold advection and cyclonically-curved low-level flow in its wake. Thus, will maintain PoPs through Sat morning.

- Somewhat active weather for next week

Looking ahead to next week, a somewhat active patten may be in store for the Great Lakes. Yet another system will approach for late Sun into Mon, but details are uncertain. Meanwhile, a 500-mb anticyclone will over Northern Canada will begin to deamplify on Sunday, with significant height falls off the Pacific coast on Mon, with possible implications for our region later in the week.

AVIATION. (For the 18Z TAFS through 18Z Wednesday afternoon) Issued at 117 PM EDT Tue Oct 19 2021

For the 18z TAF package, confidence is again high for prevailing VFR at all sites. Latest satellite imagery reveals only high clouds across lower Michigan, and 12z RAOBs at DTX/APX/GRB/DVN again sampled very dry low levels, so cumulus development is not expected today.

Surface low pressure will emerge from the Colorado Plains today, reaching the vicinity of northern Iowa by 18z Wed. Precip and other impacts from this next system will arrive after the TAF period, and only high clouds (VFR ceilings) are expected by tomorrow afternoon.

MARINE. Issued at 322 PM EDT Tue Oct 19 2021

We will carry a SCA for tonight, owing to a period of 3-5 ft waves, but conditions appear fairly marginal. Confidence is much higher for SCA conditions again on Thu in wake of departing low.

GRR WATCHES/WARNINGS/ADVISORIES. MI . None. LM . Small Craft Advisory until 8 AM EDT Wednesday for LMZ846>849.



SYNOPSIS . Kenyon DISCUSSION . Kenyon AVIATION . Kenyon MARINE . Kenyon


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
HLNM4 - 9087031 - Holland, MI 31 mi49 min S 11G12 64°F 63°F1016.9 hPa (-1.1)58°F
45161 40 mi49 min S 7.8G7.8 62°F 1018.4 hPa (-0.9)
MKGM4 - Muskegon, MI 40 mi19 min S 6G7 64°F 1017.8 hPa59°F
SJOM4 - St. Joseph, MI 73 mi49 min SSW 2.9G4.1 66°F 1019.6 hPa (-0.7)

Wind History for Holland, MI
(wind in knots)    EDIT      (on/off)   Help
5
pm
6
pm
7
pm
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
Last
24hr
SW8
S9
S8
SE3
E4
E5
E4
E4
S6
G9
S8
S9
S8
S10
S9
S12
S9
SW11
SW7
SW10
SW11
S10
S11
S11
S11
1 day
ago
W17
G21
W17
G22
W16
G20
W14
G18
W16
W17
W16
G20
W17
W15
W16
W14
G17
NW14
G17
NW12
G15
NW12
NW11
NW10
E4
NE1
W7
W5
W5
W4
SW7
SW7
G10
2 days
ago
W23
W21
W19
G24
W24
W24
W23
G28
NW19
G25
NW22
G30
NW24
NW23
NW20
G26
NW22
NW20
G26
NW22
NW23
G29
NW21
G26
NW20
NW16
G20
W15
G20
W16
G21
W18
W18
W18
G22
W17
G22

Airport Reports
    EDIT      (on/off)   Help   Click EDIT to display multiple airports. Follow links for more data.
AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Grand Rapids, Gerald R. Ford International Airport, MI9 mi56 minWSW 1210.00 miMostly Cloudy70°F51°F51%1018.4 hPa

Link to 5 minute data for KGRR

Wind History from GRR (wind in knots)
5
pm
6
pm
7
pm
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
Last 24hrW9W8W6W40S4SE3SE3SE30SE3S3S40SE3SE4SE3SW5SW10SW13W9SW12W10SW12
1 day agoW14
G23
W15
G22
NW11W4SW4SW5SW6W8W7W7W6W50S3S30000W6W6W9W5W10
2 days agoW9W10NW7SW5SW5W7W7W6W5W6W6W6W5SW4W5W5W8W8W10W14W17
G23
W13
G26
W20
G29
W19
G26

Tide / Current Tables for
   EDIT   Weekend mode (on/off)   (on/off)   Help
Tide / Current Tables for
   EDIT      (on/off)   Help
Weather Map
       (on/off)   Help Weather Map
wmap_A
GEOS Local Image of    EDIT
NOTE: This section has been updated as of 1/26/2021. If the image you are expecting is not showing, please let me know. You may use the EDIT function to update your location.
Link to Loop

Other links: GEOS-West     Contential US     Full GOES-East
Ground Weather Radar Station




Please read website Cookie, Privacy, and Disclamers by clicking HERE.