$45

Demystifying the 500 mB Chart with Lee Chesneau

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Northwest Maritime Center (Port Townsend)

431 Water Street

Port Townsend, WA 98368

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Dive into deeper discussion to further your understanding of this important tool for self-reliant marine weather forecasting & routing offshore & high seas, especially the Pacific Northwest boater. Specifically:

  • Identifying upper level troughs & ridges as depicted on 500 mb charts.

  • How 500 mb controls sea-level surface low & high pressure systems (e.g., influences as to where surface low & high pressure weather systems originate, intensify, weaken, & move).

  • Discussion & illustration of what a weather pattern is, & how to identify & recognize the four (4) basic 500 mb flow patterns.

  • A discussion of how to develop a culture of routinely accessing both 500 mb & their companion at sea-level surface pressure charts, & annotating specific features that will allow one to clearly see their connected inter-relationships.

  • To introduce the A. B, C and D zones associated with a 500 mb chart


Lee Chesneau is senior marine meteorologist & graduate from one of the elite universities that offer degrees in meteorology, the University of Wisconsin (Madison). His B.S. Degree in Meteorology was Lee’s ticket to a distinguished & 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, & his first career start as a naval officer. Today, Lee in addition to being a highly seasoned & experienced professional marine meteorologist is an accomplished U.S. Coast Guard certified instructor for basic & advanced meteorology at number or continuing training institutions for professional mariners. He offers the same curriculum to educate & train commercial fishing & recreational seafarers on becoming self-reliant in their own marine weather knowledge & forecasting, strategic vessel routing, & prudent decision making. Lee is a speaker at numerous boat shows & symposia & and has his own company: Lee Chesneau’s Marine Weather www.weatherbylee.com He can be reached by e-mail: lee@weatherbylee.com

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Northwest Maritime Center (Port Townsend)

431 Water Street

Port Townsend, WA 98368

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