Friday, December13, 2019
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Marine Weather and Tides
Cheboygan, MI

Version 3.4
NOTICE
10/9/2019 Updated the Marine Zones.
9/4/2019 Fixed the weather maps due to NOAA moving them.
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 8:10AMSunset 4:52PM Friday December 13, 2019 3:34 PM EST (20:34 UTC) Moonrise 6:24PMMoonset 9:30AM Illumination 96% Phase: Waning Gibbous; Moon at 17 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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LHZ345 Straits Of Mackinac Within 5 Nm Of Mackinac Bridge Including Mackinac Island- 1152 Am Est Fri Dec 13 2019
Today..Light winds. Patchy drizzle in the afternoon, then areas of drizzle in the afternoon. Waves 2 feet or less.
Tonight..Light winds. Patchy fog. Slight chance of freezing drizzle and patchy drizzle. Waves 2 feet or less.
Saturday..Northwest wind 10 to 15 knots. Chance of drizzle. Waves 2 feet or less.
Saturday night..Northwest wind 10 to 15 knots with gusts to around 20 knots. Chance of snow showers. Waves 2 to 3 feet. SEe the open lakes forecast for days 3 through 5.
LHZ345 Expires:201912140100;;297062 FZUS53 KAPX 131652 NSHAPX Nearshore Marine Forecast National Weather Service Gaylord MI 1152 AM EST Fri Dec 13 2019 For waters within five nautical miles of shore on Lakes Huron... Michigan and Superior. Waves are the significant wave height - the average of the highest 1/3 of the wave spectrum. Occasional wave height is the average of the highest 1/10 of the wave spectrum. LHZ345-140100-


7 Day Forecast for Marine Location Near Cheboygan, MI
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location: 45.68, -84.42     debug


Area Discussion for - Gaylord, MI
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FXUS63 KAPX 132026 AFDAPX

Area Forecast Discussion National Weather Service Gaylord MI 326 PM EST Fri Dec 13 2019

NEAR TERM. (Through Tonight) Issued at 317 PM EST Fri Dec 13 2019

High Impact Weather Potential: Some freezing drizzle threat eastern Upper?

Pattern Synopsis/Forecast: Early afternoon surface analysis shows a nearly stationary northeast-southwest boundary pretty much bisecting the forecast area. Boundary fairly evident across southeast Upper with DRM at 38/37 while to the north temperatures are still in the upper 20s with a good bit of freezing fog reported. A clipper low was located over southeast North Dakota . though it is trailing its supporting short wave trough which is spinning across Minnesota. A narrow band of radar returns was crossing the Mississippi River between the Minnesota short wave trough and a second over northern Missouri Overcast skies across northern Michigan this afternoon. some fog to the west of the stationary boundary over eastern Upper as mentioned above and along the northwest Lower shoreline counties . some drizzle/flurries/freezing fog also occurring over these same areas. Higher cloud ceilings exist over northeast Lower.

Pressure pattern flattens out across Michigan tonight . between Dakotas clipper low which looks to fall apart as its upper support moves away . and a developing east coast low for Saturday. Light boundary layer flow most of the night will eventually become northwesterly Saturday morning and begin to strengthen as pressure gradient tightens due to downstream surface low development.

Primary Forecast Concerns: Linger low level moisture and light flow should bring about some lowering of clouds bases along/behind the stationary boundary . with some signal for fog expansion farther into Lower Michigan. Low level moisture profile across eastern Upper into northwest Lower still suggestive of some drizzle/freezing drizzle potential . after coordinating with MQT will keep that threat going across eastern Upper. Current advisory drops off at 5pm and am inclined to let that go at forecast issuance time and see how things develop this evening. Band of radar echoes moving into northwest Wisconsin will likely thin with time . not expecting much of a chance of precipitation tonight with that feature given general synoptic scale subsidence expected. Temperatures overnight expected to dip into the 20s.

SHORT TERM. (Saturday through Monday) Issued at 317 PM EST Fri Dec 13 2019

High Impact Weather Potential: Minimal

. Light drizzle followed by lake effect snow .

Synopsis: The weekend begins with a longwave trough advancing across the southeastern CONUS with a much more subtle shortwave moving into the Great Lakes region. A cyclone will develop and strengthen somewhat rapidly underneath favorable upper-level dynamics/forcing as it moves to the northeast along the Atlantic coast. Surface high pressure builds into the northern Great Plains underneath subsidence aloft. An isallobaric response in the wind field generated by these two systems helps drive enhanced northwest winds into the area by Saturday evening.

Details: Lingering drizzle/freezing drizzle is possible into the afternoon on Saturday as saturated low-level profiles warmer than -10 C suggest lower probabilities of cloud ice formation. As previously mentioned, northwest winds are expected to pick up going into the evening hours. This cold air advection will cool the near surface profile with time, creating an environment much more conducive for cloud ice formation. With low-level moistening and 850mb temps creeping into the DGZ going into Saturday night, some lake effect snow is expected in typical northwest flow belt areas. Since depth of moisture/inversion heights and duration of favorable winds aren't overly impressive, snowfall totals of 1-2" for most are currently expected into Sunday morning with locally higher amounts possible within heavier, more organized lake effect bands. Winds shift more westerly throughout the day Sunday, but little accumulation is expected at this time as favorable lake effect ingredients will be departing the forecast area.

Otherwise, overcast/mostly cloudy conditions are expected through the weekend as temperatures begin to fall into Saturday evening. Lows Sunday morning will mostly be in the upper teens to low 20s across northern lower with portions of eastern upper dipping down into the low teens overnight. Temperatures will warm up a few degrees Sunday afternoon into the low to mid 20s across the area.

LONG TERM. (Monday night through Friday) Issued at 317 PM EST Fri Dec 13 2019

Main Concerns: Lake effect snow mid-week

As the previously mentioned trough/cyclone departs the CONUS to the northeast heading into Monday, another longwave trough is expected to move across the southern US and support the development of another cyclone. While differing model solutions exist, this system will most likely move across the Ohio River valley and have focused impacts to our south and east. Some parts of the forecast area could see snow directly related to this cyclone, but any accumulations are expected to be light and the forecast path could still change as we are still a few days away. Regardless, the main focus of the time period will be additional lake effect snow mid-week with west/northwest winds provided between this cyclone as it moves northeast and high pressure that once again builds across the northern Great Plains. This should keep temps in the teens and 20s for most of the week before potentially warming up some as next weekend approaches.

AVIATION. (For the 18Z TAFS through 18Z Saturday afternoon) Issued at 1238 PM EST Fri Dec 13 2019

MVFR/IFR conditions expected to prevail at PLN/TVC/MBL through tonight into Saturday morning with a combination of weak flow and lingering low level moisture. VFR conditions at APN expected to drop to high end MVFR overnight.

MARINE. Issued at 317 PM EST Fri Dec 13 2019

No issues tonight as pressure gradient flattens . but with an east coast low ramping up overnight into Saturday pressure gradient with tighten up with increasing northwest winds as Saturday progresses. Widespread Small Craft Advisories appear likely by at least Saturday evening . SCA conditions may linger along the northeast Lower nearshore zones into Sunday afternoon.

APX WATCHES/WARNINGS/ADVISORIES. MI . NONE. LH . NONE. LM . NONE. LS . NONE.

NEAR TERM . JPB SHORT TERM . DJC LONG TERM . DJC MARINE . JPB


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
MACM4 - 9075080 - Mackinaw City, MI 17 mi59 min SE 5.1 G 6 35°F 36°F1010.7 hPa34°F
DTLM4 - 9075099 - De Tour Village, MI 35 mi59 min Calm G 1 34°F 37°F1010.8 hPa34°F
WSLM4 40 mi65 min 33°F 36°F1011.2 hPa33°F
RCKM4 - 9076024 - Rock Cut, MI 42 mi59 min ENE 1.9 G 1.9 1011 hPa
WNEM4 - 9076027 - West Neebish, MI 43 mi59 min ESE 1.9 G 5.1 30°F 1010.6 hPa29°F

Wind History for Mackinaw City, MI
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Cheboygan, Cheboygan County Airport, MI6 mi60 minN 07.00 miOvercast34°F32°F94%1010.8 hPa
Mackinac Island Airport, MI17 mi40 minSSE 45.00 miFog/Mist36°F35°F100%1010.8 hPa
Pellston Regional Airport of Emmet County, MI21 mi41 minS 33.00 miFog/Mist34°F33°F97%1012 hPa

Link to 5 minute data for KCIU

Wind History from CIU (wind in knots)
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Last 24hrSE13SE8E6E7E7E8E6E6NE4NE3NE3CalmCalmN4NE5NE5NE4NE5NE4E5NE3E5E4NE4
1 day agoW12
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W7W9SW5SW8W5W5W4W4S3S5CalmSE4CalmSE6SE10SE8E9
2 days agoS5SE4S4W10W11W8W6W6W10W10W10W12W11W8W13
G18
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W9W10W9W9
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Tide / Current Tables for
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Tide / Current Tables for
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Weather Map
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wmap_A
GEOS Local Image of GreatLakes    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 Gaylord, MI (15,3,4,5)
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Ground Weather Radar Station Gaylord, MI
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