Weather Forecasting & Route Planning With GRibs

Weather Forecasting & Route Planning With GRibs

GRibs (an abbreviation for gridded binary) are small, readily-available data files that contain a wealth of weather forecasting information. Using GRibs is a great way for long-distance, cruising, and day sailors to forecast the weather and plan the most favorable route, particularly when restricted by a slow Internet connection. This four-hour clinic will cover the following topics:

  • A few basic weather principles
  • How to decode the confusing symbols, color shading, and meteorological shorthand on weather forecast maps
  • Choosing the right GRib file for your location and type of sailing
  • Selecting a GRib viewing software (there are several free options)
  • Options for downloading GRib files
  • Configuring your GRib software
  • Preparing a marine forecast based on the data in your GRib file
  • Weather routing using GRib data and your boat’s sailing characteristics
  • A few of the limitations associated with forecasting using GRib files

The four-hour clinic combines classroom instruction, case studies, and exercises to create an engaging learning experience.

Click here to download the flyer for this clinic.

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.

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.

Phone: 440.250.9179

Seminar Schedule

EYC Weather Savvy Wednesdays
Edgewater Yacht Club, Cleveland, Ohio
Dates: Postponed
Time: 6:00 pm to 8:30 pm

Click here for more information on the seminar.

Live Webinar - Tropical Weather Forecasting For Cruisers
Great Lakes Cruising Club School
Date: April 21, 2020
Time: 8:00 pm to 9:30 pm, Eastern Time

Click here for more information on the seminar.

Live Webinar - Understanding & Avoiding Thunderstorms
Great Lakes Cruising Club School
Date: May 6 & 7, 2020
Time: 7:30 pm to 9:30 pm, Eastern Time

Click here for more information on the seminar.

Click here for the complete seminar schedule.

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

Click here for more testimonials.