Answer Happy

Pressure patterns on surface weather maps are depicted by isobars-lines of equal atmospheric pressure. The strength of the pressure gradient force can be determined by the spacing of the isobars: closely spaced isobars indicate a strong pressure gradient force and fast winds; isobars spaced far apart indicate a weak pressure gradient force and slow winds. When drawing a line to represent the pressure gradient force, it is always directed perpendicular to the isobars, and points away from areas of high pressure and towards areas of low pressure (Figure 6.1). Figure 6.2 on the next page shows surface pressure depicted with isobars (thin blue lines) at four millibar (mb) intervals. The isobars are labelled at the end of the lines, or along the lines if they loop back onto themselves to form a pressure cell. There are a number of empty boxes (fillable text boxes) spaced across the map. You will use Figure 6.2 on the next page to answer questions 1 and 2. Not all boxes will be used. Direction of air movement "Down" the pressure gradient High-pressure High Pressure 1020 mb 1016 mb- Figure 6.1. Air Low-pressure air O -1012 mb. LOW Pressure tends to move from areas of high pressure to areas of low pressure. The top figure shows a side view; the bottom figure shows a top-down view.
2 1. Fill in the text box for the area of highest air pressure with an "H" and fill in the text box for the area of lowest air pressure with an "L" on Figure 6.2. Only one box will be labelled with a "H" and only one box will be labelled with an "L" on the map. 2. Fill in the text box for the area with the steepest pressure gradient with a "S" and fill in the text box for the area with the gentlest pressure gradient with a "G" on Figure 6.2. Only one box will be labelled with a "S" and only one box will be labelled with an "G" on the map. 3. According to Figure 6.2, which state has the faster winds, Illinois or California? Explain the reason for your answer. 2
1020 1020 1024 1028 1024 1028 1032 1028 1024 1036 1032 1028 1020 1024 1020 1020 1016. 1012 1008 C 1004 966 1000 1024 1020 1028 1024 1028 Figure 6.2. A surface weather map with isobars (blue lines) showing the spatial pattern of atmospheric (air) pressure, labelled in millibars (mb). I If the pressure gradient force was the only force acting on winds, winds would blow perpendicular to Goo