Unlocking the Mystery of the 500 Mb Upper-Air Constant Pressure Surface Chart
We measure the weight of the entire vertical atmosphere at sea-level called “barometric pressure” (or sometimes referred as “atmospheric pressure”) which reads on average 1013.2 millibars (mb). The mb is the key unit used for measuring atmospheric pressure, especially in the marine environment; from at the sea-level surface, to the far upper-air levels in the atmosphere above. The measuring instrument that most boaters employ to determine barometric pressure is with a barometer.
This seminar will discuss what professional marine meteorologists/routers who forecast & route vessels refer the “500 mb upper- air constant pressure surface” to, as the “holy grail of weather forecasting & routing”.
In this free seminar, specifically:
- We will first break down the components of the “500 mb upper- air constant pressure surface chart” (altitude, wind, trough axis).
- Even though your boat is on the sea-level surface, the fact is that most surface weather is directly influenced by what lies above.
- Thus, the 500 mb upper- air “constant pressure surface” is about half way up the atmosphere (given the sea-level surface “barometric pressure” on average will measure 1013.2 mb).
- 500 mb is that upper-air level (or “constant pressure surface”) in the atmosphere, that controls how & where at sea-level surface weather conditions evolve (develops, intensifies, weakens & moves). In other words, what kind of weather your boat will experience on a day to day basis.
- Examples of 500 mb upper-air charts & their companion at sea-level surface pressure charts will reveal conclusively, the direct inter-relationship between the two separate surfaces (frames of reference).
There will be an overview of the practical applications via “Rules of Thumb” as to why 500 mb upper air charts are important tools for its companion at sea-level surface pressure & wind and wave charts, as discussed in Lee Chesneau’s free seminars; “Assessing Your Marine Weather Self Reliant Skills… An Introduction to the Sea-level Surface Pressure Chart”, & “ Wind & Wave Concepts & How to Integrate Them with the Sea-level Surface Pressure Charts”, as the two product are separate but directly related (Saturday, September 24th, 1200-1300 & 1600-1700, Waterford Room, South Shore Harbour Resort.
See SWIBS seminar page for seminar descriptions details, Click below: http://southwestinternationalboatshow.com/2016-seminar-series/
Starting the weekend of weather & free seminars noted above on Saturday, September 24th is the ($65.00) prepaid educational workshop, “Tropical Cyclone (Hurricane) Basics & the 1-2-3 Rule for Avoidance Workshop”, Waterford Room, South Shore Harbour Resort: 0800 to-1100
See SWIBS educational workshop page for topic syllabus & registration details; Click below: http://southwestinternationalboatshow.com/2016-educational-workshops/
Sunday, September 25th Begins the full slate of 3-hour long ($65.00) prepaid educational workshops:
“The at Sea-level Surface Pressure Chart Workshop” 0800-1100, Amphitheater, South Shore Harbour Resort
“Understanding the 500 Mb Upper Air Chart Workshop” 1130-1430, Amphitheater, South Shore Harbour Resort
Finishing up with the most important workshop of the day that culminates what has been learned throughout the entire weekend of seminars and workshops:
“Understanding Weather & Cruise Decision Making Workshop” 1500-1800, Amphitheater Room, South Shore Harbour Resort
All educational ($65.00) prepaid workshops (combined with the aforementioned prerequisite free fee seminars), will enhance a boater’s knowledge on marine weather, forecasting, & prudent decision making!
See SWIBS educational prepaid workshop page for topic syllabus & registration details; Click below: