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Drawing Isobars:Isobars are lines drawn to connect identical
values shown on maps
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Drawing Isobars:In meteorology, isobars are used to connect
points of equal atmospheric pressure
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Drawing Isobars:This information will graphically depict weather
phenomena that can be used in forecasting
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Drawing Isobars:Lets begin by using the blank Weather
Forecasting Review Worksheet
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Drawing Isobars:Using a pencil, you will lightly draw lines
connecting identical values of sea level pressure.
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Drawing Isobars:Isobar lines do not cross each other.
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Drawing Isobars:Isobars are usually drawn for every four
millibars using 1000 millibars as your starting point.
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Drawing Isobars:Therefore, these lines should have values of
1000, 1004, 1008, 1012, 106,etc., or 996, 992, 988, 984, etc.,
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Drawing Isobars:Begin drawing from 1024 millibars station
pressure over Salt Lake City
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Drawing Isobars:Draw a line to the next 1024 value located to
the NE as shown..
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Drawing Isobars:Without lifting your pencil from the paper,
continue drawing a line connecting the 1024 values located in the
SE and SW
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Drawing Isobars:Repeat the procedure for the next isobar value
of 1020
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Drawing Isobars:Repeat the procedure for the next isobar value
of 1016
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Drawing Isobars:Repeat the procedure for the next isobar value
of 1016
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Drawing Isobars:Repeat the procedure for the next isobar value
of 1012
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Drawing Isobars:Repeat the procedure for the next isobar value
of 1008
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Drawing Isobars:Repeat the procedure for the next isobar value
of 1008
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Drawing Isobars:Your finished drawing should look something like
this:
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Drawing Isobars:These isobars can be used to identify High and
Low pressure systemsWhich of these systems is a High pressure
system?AB
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Drawing Isobars:A is a high pressure systemA
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Drawing Isobars:Draw a large H in the center of the high
pressure system as shownH
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Drawing Isobars:In a high pressure system, winds revolve around
it in a clockwise directionH
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High Pressure SystemsIn high pressure systems, wind direction is
created by the sinking of cooler, drier air
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Drawing Isobars:B refers to a low pressure systemBHL
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Drawing Isobars:In a low pressure system, winds revolve around
it in a counter-clockwise directionBHL
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Drawing Isobars:In most cases, these air pressure systems move
in a west to east directionHL
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Low Pressure SystemsIn low pressure systems, wind direction is
created by the rising of warm, moist air
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Drawing Isobars:If we ignore the numbers, this is how the map
might look after 24 hoursHL
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Drawing Isobars:This information will graphically depict weather
phenomena that can be used in forecasting
