|In this lesson, you will learn how to read a weather map and look at frontal precipitation in greater detail.|
Weather Maps are absolutely critical for forecasters. They contain information regarding fronts, highs and lows, isobars, and weather data for specific locations expressed through the use of symbols.
Before delving into the various components of a weather map, one should have a more in depth understanding of frontal precipitation.
Frontal Precipitation In Depth
Read pages 172 to 175 in Planet Earth: A Physical Geography.
State of Weather: Light Rain
Air pressure is shown on a weather map using isobars - lines joining points of equal pressure at the earth's surface. You may think of isobars as being similar to contour lines on a topographic map but instead of elevation, air pressure is represented. Recall that strong winds occur where there is a strong pressure differential. This can be seen on a weather map where the isobars are close together. Again similar to a topographic map where contour lines being close together indicates a steep slope / gradient, isobars being close together indicates a significant pressure gradient.
Reading a Weather Map and Predicting the Weather
Read pages 186
to 190 in Planet Earth: A Physical Geography.
With the example above, the
air pressure number is 013.
Add a 9 in front of the number (i.e. 9013) and move the decimal
two places to the left (i.e. 90.13).
Read the information presented above and then answer the following questions in your notebook. *E-mail your responses to Questions #A5, C2, and C3 to your instructor as a document attachment*. This assignment is worth 10 marks.
A) Frontal Precipitation in Depth
3a) Which cloud is associated with the leading
edge of a warm front?
2) With the aid of Figure 9.17 (Map and Legend)
on pages 188 and 189, answer the following:
3) With reference to the weather map below, answer the following:
a) Describe the characteristics of a Continental
Arctic air mass. Give data from the weather map to support your
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