The isobaric map, below, shows lines of consistent pressure values at an interval of 4 mb. Two pressure centers are apparent on the map. Identify the area of high pressure and the area of low pressure on the map.
Indicate the surface wind direction for each of the labeled stars on the map.
For this specific exercise, assign a cardinal direction (north, south, east, or west) to indicate wind direction. Answers other than one of the four cardinal directions (“NE” for example) will be incorrect.
Consider using surface wind diagrams from the Chapter 4 powerpoint or the textbook (particularly Figures 4-18 and 4-19 on pages 112 and 113) to assist you in determining surface winds around high and low pressure systems. Also, recall that winds are named for the direction at which they originate.
1. Surface wind direction at A:
2. Surface wind direction at B:
3. Surface wind direction at C:
4. Surface wind direction at D:
Using a piece of paper and a pencil, carefully mark the distance between the center of the anticyclone to the center of the cyclone (on the computer screen).
Use the scale bar, situated in the lower right corner of the map, to indicate the total number of miles for the distance that you measured between the system centers.
5. The total distance (miles) between pressure system centers:
6. What is the difference in barometric pressure between the high and low pressure systems?
7. To calculate the average horizontal pressure gradient (per 100 miles) between the two systems, apply the following logic:
total number of miles (from #5, above) / 100 = X
the difference (in mb) between the two pressure centers (from #6, above) / X = average rate of pressure change per 100 miles
The average rate of change (or pressure gradient) for every 100 miles between the two systems (use correct annotation):
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