Custom Weather Forecasts

Bayview Mac and Chicago Mac Custom Weather Forecasts

Creating a Bayview or Chicago Mac weather forecast and deciding on a race strategy can be challenging. A custom forecast from LakeErieWX can relieve much of the burden and allow you to focus on other last-minute details. Custom forecasts are delivered via email in PDF format and include a detailed discussion of the expected weather conditions including:

  • The location and movement of areas of high and low pressure.
  • The passage of cold fronts, warm fronts, stationary fronts, and troughs and the anticipated impact on the wind.
  • The potential for thunderstorms including when, where, and what type of storms are expected.
  • Detailed wind speed, wind direction, gust speed, and wave height forecast at 3-hour intervals.
  • Computer-generated routing based on the wind forecast and your yacht’s unique performance characteristics (polars required).

A custom forecast package for either Mac covering Saturday, Sunday and Monday is only $225. Custom forecasts for those participating in the Chicago-Mac Cruising Division are also $225 and cover Friday afternoon through Monday morning.

Please click here for a sample custom forecast.

Note: Creating a custom forecast is time-consuming, therefore only five customers are accepted for each Mac. Please contact me at Mark@LakeErieWX.com to sign up for this year's race.


Mark Thornton

Mark Thornton has been sailing for more than 25 years and currently owns Osprey, a C&C 35. His interest in weather forecasting grew from his experiences cruising and racing on the Great Lakes. Mark is a 2006 graduate of the Penn State University Certificate of Achievement in Weather Forecasting, a two-year program that develops skills in general, tropical, and severe weather forecasting.

He is the president of LakeErieWX LLC, a company dedicated to providing marine weather education and forecasting resources for recreational boaters (www.lakeeriewx.com). Mark publishes a marine weather blog and teaches basic forecasting seminars to recreational boaters during the off-season. He has served as the Race Meteorologist for the Bell’s Beer Bayview Race to Mackinac since 2014. Mark is employed as the Vice-President of Administration for the law firm of Wegman, Hessler & Vanderburg, and as a Teaching Assistant in the Certificate of Achievement in Weather Forecasting Program at Penn State University.

As both a sailor and a meteorologist, I am uniquely qualified to improve the weather-related skills of your members. Please contact me by email or call 440-250-9179 to learn how a weather forecasting seminar can help address your organization's educational, safety, and membership goals.

Click here to view my meteorological resume or here to read about my marine weather forecasting seminars and workshops.

Interested in reading and learning more about marine weather? A few times each year, I publish an article on an interesting marine weather event. Click here to subscribe to my 'no spam' email distribution list.

Email: Mark@LakeErieWX.com
Phone: 440.250.9179

Upcoming Seminars


Now scheduling for 2017/2018


Friday, January 12, 2018
Basic Great Lake Marine Weather Forecasting
Strictly Sail - Chicago Boat Show


Saturday, February 24, 2018
Basic Great Lake Marine Weather Forecasting
Bayview Yacht Club, Detroit, MI


Tuesdays - February 27, March 6, March 13, and March 20, 2018
GLCC Weather Savvy Mariner Webinar Series
Great Lakes Cruising Club


Wednesdays - February 28, March 7 & March 14, 2018
Weather Savvy Wednesday-Great Lakes Basic Marine Weather Forecasting
Edgewater Yacht Club
Cleveland, OH


Saturday, March 3, 2018
Basic Great Lake Marine Weather Forecasting
South Shore Yacht Club
Milwaukee, WI


Saturday, March 10, 2018
Great Lakes Wind Forecasting: A Workshop for Sailors
Bay City Yacht Club
Bay City, MI


Saturday, March 24, 2018
Great Lakes Wind Forecasting: A Workshop for Sailors
Edgewater Yacht Club
Cleveland, OH


Thursday, April 19, 2018
Marine Weather Forecasting
(seminar outline)
Cruisers University/Annapolis Boat Shows
Annapolis, MD


Click Here For Full Schedule


Seminar Reviews
"You have a passion for meteorology that is contagious and a gift for communicating a complex subject." -- Steve H.

Click Here For More Reviews