Drawing Isobars: Isobars are lines drawn to connect identical values shown on maps…

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Presentation transcript:

Drawing Isobars: Isobars are lines drawn to connect identical values shown on maps…

Drawing Isobars: In meteorology, isobars are used to connect points of equal atmospheric pressure…

Drawing Isobars: This information will graphically depict weather phenomena that can be used in forecasting…

Drawing Isobars: Let’s begin by using the blank Weather Forecasting Review Worksheet…

Drawing Isobars: Using a pencil, you will lightly draw lines connecting identical values of sea level pressure.

Drawing Isobars: Isobar lines do not cross each other.

Drawing Isobars: Isobars are usually drawn for every four millibars using 1000 millibars as your starting point.

Drawing Isobars: Therefore, these lines should have values of 1000, 1004, 1008, 1012, 106,etc., or 996, 992, 988, 984, etc.,

Drawing Isobars: Begin drawing from 1024 millibars station pressure over Salt Lake City…

Drawing Isobars: Draw a line to the next 1024 value located to the NE as shown..

Drawing Isobars: Without lifting your pencil from the paper, continue drawing a line connecting the 1024 values located in the SE and SW

Drawing Isobars: Repeat the procedure for the next isobar value of 1020

Drawing Isobars: Repeat the procedure for the next isobar value of 1016

Drawing Isobars: Repeat the procedure for the next isobar value of 1016

Drawing Isobars: Repeat the procedure for the next isobar value of 1012

Drawing Isobars: Repeat the procedure for the next isobar value of 1008

Drawing Isobars: Repeat the procedure for the next isobar value of 1008

Drawing Isobars: Your finished drawing should look something like this:

Drawing Isobars: These isobars can be used to identify ‘High’ and ‘Low’ pressure systems… Which of these systems is a ‘High’ pressure system? A B

Drawing Isobars: A is a high pressure system A

Drawing Isobars: Draw a large ‘H’ in the center of the high pressure system as shown H

Drawing Isobars: In a high pressure system, winds revolve around it in a clockwise direction… H

High Pressure Systems In high pressure systems, wind direction is created by the sinking of cooler, drier air…

Drawing Isobars: B refers to a ‘low’ pressure system B H L

Drawing Isobars: In a low pressure system, winds revolve around it in a counter-clockwise direction… B H L

Drawing Isobars: In most cases, these air pressure systems move in a west to east direction… H L

Low Pressure Systems In low pressure systems, wind direction is created by the rising of warm, moist air…

Drawing Isobars: If we ignore the numbers, this is how the map might look after 24 hours… H L

Drawing Isobars: This information will graphically depict weather phenomena that can be used in forecasting…