GLCC Weather Savvy Mariner Series
Great Lakes Marine Weather Seminar
For Powerboaters and Sailors

February 25, March 3, March 10 and March 17, 2020


Learn a little weather forecasting and reduce the uncertainty of boating on the Great Lakes. While it isn’t possible to predict the weather with total precision, it doesn’t mean that the weather must be entirely unpredictable. The Weather Savvy Mariner series is designed to provide Great Lakes power boaters and sailors with an understanding of basic marine weather forecasting. With these skills, you can:

  • Improve your decision-making for family outings.
  • Enhance your confidence in planning long-distance journeys.
  • Improve your racing performance.
  • Reduce the likelihood of being exposed to uncomfortable or hazardous weather conditions.

What you can expect to learn from the webinars:

  • How to decode the confusing symbols and meteorological shorthand on forecast graphics.
  • How to predict the development and movement of low pressure systems and their accompanying frontal boundaries.
  • Why the wind behaves the way it does and how to prepare a detailed wind forecast.
  • How to prepare a detailed wave height forecast.
  • How to forecast the potential and nature of severe weather.
  • The terminology used by the National Weather Service during hazardous and severe weather events.
  • How to use Doppler weather radar to help you avoid a hair-raising encounter with a thunderstorm.
  • Where to find forecast graphics and a strategy for preparing a multi-day marine forecast.

Seminar Outline

  • Week One - February 25, 2020
    • Basic Meteorological Principles
    • Translating Surface Weather Maps
  • Week Two - March 3, 2020
    • Forces Controlling the Wind
    • Doppler Weather Radar
  • Week Three - March 10, 2020
    • High and Low Pressure Systems
  • Week Four - March 17, 2020
    • Thunderstorms
    • Creating A Daily Forecast Routine
Click here to download a copy of this flyer.
Online webinars at GLCC School

February 25, March 3, March 11 and March 17, 2020

8:00 pm to 9:30 pm

$60 for the series. $55 for GLCC members.

Registration: Click here to register at the GLCC School website.

Please send questions regarding the seminar to Mark Thornton at Please click here to view the speaker's biography.

About The Presenter

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 ( 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 also employed as a Teaching Assistant in the Certificate of Achievement in Weather Forecasting Program at Penn State University.