Understanding the Weather

Understanding the Weather Surface Pressure Chart

with Lee Chesneau

September 7, from 9:00 a.m. to 12:00 p.m. $45

Register here.

With a lot of weather information now available through cellular data for cruisers, interpreting weather charts is important. During this 3-hour seminar, we will delve into understanding the Surface Pressure Chart. We will take a close look at examining what you need to know, including:

  • Detailed discussion and exercises on the various symbols depicted on an at sea-level surface pressure map that impacts both coastal and offshore waters of the Pacific
  • Determining true wind direction and speed wind barb associated with key low and high-pressure symbols exercise.
  • Discussion and follow-up exercise on being able to anticipated specific weather conditions (such as cloud types, precipitation, visibility restrictions, and winds (e.g. true direction and speed)), all associated with common surface pressure chart symbols, from fronts, troughs, squall lines, and shear lines.
  • Discussion and follow-up exercise on the difference between “Issued” and “Valid” from the U.S. National Weather Service’s (NWS) Ocean Prediction Center (OPC) analyses and forecast charts.
  • Finally, there will be a discussion and follow-up exercise on the 24-hour interval specific tracking and intensity trends (marine advisories and warnings) of the surface map’s L’s and H’s pressure centers.

Seminar will take place at the Northwest Maritime Center, 431 Water Street, Port Townsend, WA 98368

Register here.

A little bit about Lee:

Lee Chesneau is a senior marine meteorologist and graduate from one of the elite universities that offer degrees in meteorology, the University of Wisconsin (Madison). His Bachelor of Science Degree in Meteorology was Lee’s ticket to a distinguished and extensive career with NOAA’s National Weather Service (NWS) & Satellite Service (NESDIS). Lee also served as a U.S. Navy civilian Ship Routing Officer (SRO), a “Route Analyst” for a major commercial ship routing company, and his first career started as a naval officer.

In addition, to being a highly seasoned and experienced professional marine meteorologist, he is an accomplished U.S. Coast Guard certified instructor for basic and advanced meteorology at continuing training institutions for professional mariners. He offers the same curriculum to educate and train commercial fishing and recreational seafarers on becoming self-reliant in their own marine weather knowledge and forecasting, strategic vessel routing, and prudent decision making. Lee is a speaker at numerous boat shows and symposia and has his own company: Lee Chesneau’s Marine Weather www.weatherbylee.com He can be reached by e-mail: lee@weatherbylee.com


Northwest Maritime Center LogoWaggoner Cruising GuideThis course is being presented by the NW Maritime Center together with the Waggoner Cruising Guide at the Port Townsend Wooden Boat Festival just before the Festival’s formal opening. Arrive early for the Festival and stay on your boat or stay in one of the convenient hotels in Port Townsend.

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