Download DRYC GRABOWSKI SEMINAR – Sept 18th Navigation – Plying the

DRYC GRABOWSKI SEMINAR – Sept 18th
Navigation – Plying the Waters
WX – BASIC WEATHER FOR BOATERS
IMPORTANCE OF WEATHER KNOWEDLGE:
 Safety - & Enjoyment –
 Efficient Passage Making and/or Racing –
WHAT CAUSES WEATHER?
 Atmospheric Physics - Boyles Laws
 Sun’s Influence - The Furnace
 Seasons -- The Tilted Earth
GLOBAL WEATHER:
 WX Global Zones – Atmosphere Movement
 Jet Stream – WX Guidance
WINDS:
 Prevailing Winds - Jet Stream: 500 milibar
 Local wind patterns - cells
PRESSURE SYSTEMS:
 HIGHS – Happy Air dry dance spinning
clockwise (northern hemisphere)
 LOWS – Sad Air wet with tears spinning counterclockwise (northern hemisphere)
 Interface – Where the Action is!
FRONTS:
 Cold Front – dry cool to cold
 Warm Front – moist warm
 Occluded Front –
CLOUDS AND THEIR MEANING:
 Stratus - static
 Cumulus – dynamic
 Cirrus – advanced warning – Mare’s Tails to Fish Scales
 Cloud types & Altitudes - interpreting their message
STORMS:
 Thunder Storms and Tornados - Cumulonimbus crescendo clouds & beyond
 Tropical Storms and Hurricanes – Oceans Influence – warm water as fuel
SOURCES OF WEATHER INFORMATION:
 The Sky – Look out the Window! Check the Barometer
 NOAA – various outlets including WX VHF channels
 TV – Weather Channel and local news – Accuweather, newspapers
LEARNING MORE:
 The Weather Book
 The Weather Wizard’s Cloud Book
 Eye Wonder: Weather
Presented by David Appleton