Chapter 3: Weather Map - Home | www.ess.uci.edu
Chapter 3: Weather Map
?Station Model and Weather Maps ? Pressure as a Vertical Coordinate ? Constant Pressure Maps ? Cross Sections
ESS124 Prof. Jin-Yi Yu
Weather Maps
(from Understanding Weather & Climate)
? Many variables are needed to described weather conditions.
? Local weathers are affected by weather pattern.
? We need to see all the numbers describing weathers at many locations.
? We need weather maps.
? "A picture is worth a thousand words".
ESS124 Prof. Jin-Yi Yu
The Station Model
(from Meteorology: Understanding the Atmosphere)
Meteorologists need a way to condense all the numbers describing the current weather at a location into a compact diagram that takes up as little space as possible on a weather map.
This compressed geographical weather report is called a station model.
ESS124 Prof. Jin-Yi Yu
Weather Map on 7/7/2005
(from Meteorology: Understanding the Atmosphere)
ESS124 Prof. Jin-Yi Yu
Isobar
? It is useful to examine horizontal pressure differences across space.
? Pressure maps depict isobars, lines of equal pressure.
? Through analysis of isobaric charts, pressure gradients are apparent.
? Steep (weak) pressure gradients are indicated by closely (widely)
spaced isobars.
ESS124 Prof. Jin-Yi Yu
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