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Name:
Title: Geography 217
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Date:
Part 1
1. Key attributes of weather forecasting charts
The 200/300 mb charts
They are used to measure constant pressure. They are used to forecast the weather by
observations between 8000 to 9600m elevation. The following are what to look for in these
charts;
a) Jet streams-this is a river of air with segments of higher speed winds embedded within
the mean flow.
b) Jet streaks- this is the portion of the overall jet stream where winds along the jet core
flow are stronger than in the areas along the jet stream.
c) General trough ridge pattern- momentum of the jet streams carves the trough ridge
pattern and if the jet stream winds are greater on the eft side of the trough, it becomes
more amplified and moves further to the south and if the wind becomes greater on the
right then trough becomes less amplified with time and move further.
700mb chart
a) Are used to find area with low dewpoint depressions which often indicates deep layer of
moisture.
b) It is a low-level chart i.e. used at lower altitudes of the atmosphere for weather
forecasting.
c) Can be used in determining strength of warm air ...