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Exercise 21 Problems-Part I The following questions are based on Figures 21-1, 212, and 21-3,
radar images of Louisiana from the Fort Polk Doppler radar site taken on October 9, 2020, at
about 20:00 UTC. At the time of these radar images, Hurricane Delta was moving toward
landfall in southern Louisiana near the city of Lake Charles, south of the radar site. Figure 21-4
is a weather map showing the location of the Fort Polk radar site and the general storm track of
Hurricane Delta as it approached shore. Figure 21-4: Weather map for the Gulf Coast of the
United States on October 9,2020 . Blue arrow shows location of the Doppler weather radar site at
Fort Polk, Louisiana. Red dashed arrow shows approximate storm track of Hurricane Delta as it
made landfall in Louisiana. (Adapted from National Weather Service) Figure 21-1: (a) Base
reflectivity and (b) composite reflectivity radar images for Fort Polk, Louisiana (shown with red
star in center of images), on October 9, 2020, at approximately 20:00 UTC. (Images courtesy of
National Weather Service) 1. Why does the composite reflectively image (Figure 21-1b) show a
wider area of precipitation than the base reflectivity image (Figure 21 1 a )? 2. Using the base
velocity image (Figure 21 2 a ), estimate the dominant wind direction coming toward the Fort
Polk radar site (shown with a yellow star):

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Exercise 21 Problems-Part I The following questions are based on Figur.pdf

  • 1. Exercise 21 Problems-Part I The following questions are based on Figures 21-1, 212, and 21-3, radar images of Louisiana from the Fort Polk Doppler radar site taken on October 9, 2020, at about 20:00 UTC. At the time of these radar images, Hurricane Delta was moving toward landfall in southern Louisiana near the city of Lake Charles, south of the radar site. Figure 21-4 is a weather map showing the location of the Fort Polk radar site and the general storm track of Hurricane Delta as it approached shore. Figure 21-4: Weather map for the Gulf Coast of the United States on October 9,2020 . Blue arrow shows location of the Doppler weather radar site at Fort Polk, Louisiana. Red dashed arrow shows approximate storm track of Hurricane Delta as it made landfall in Louisiana. (Adapted from National Weather Service) Figure 21-1: (a) Base reflectivity and (b) composite reflectivity radar images for Fort Polk, Louisiana (shown with red star in center of images), on October 9, 2020, at approximately 20:00 UTC. (Images courtesy of National Weather Service) 1. Why does the composite reflectively image (Figure 21-1b) show a wider area of precipitation than the base reflectivity image (Figure 21 1 a )? 2. Using the base velocity image (Figure 21 2 a ), estimate the dominant wind direction coming toward the Fort Polk radar site (shown with a yellow star):