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Miami Dade College, Miami *

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1210

Subject

Geography

Date

Feb 20, 2024

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png

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1

Uploaded by ChancellorFish4041

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* Acolthe point ot intersection ot a trough and a ridge. It takes the torm ot a saddle where the air pressure is relativelv hinher than that of the Inw-nresaiire reainns hiit lnwer than that of the anticyclq & @ 9 O F Y O | S ection..The weather i ¢ S Y imulation Of MOISTUIC 11h tiie i tiiot e to s o v tsr 1 o wies v wie s o w wt@liONAry or quasi-stationary front . 16. In which direction do tornados spin in the northern hemisphere? (P37) -+ Tornadoes tend to revolvecounterclockwisein the Northern Hemisphere . 17. Does Coriolis affect an aircraft's flight path and if so, how do pilots correct for it? (Figure 4-8, P37) (You may have to go to the internet for the answer.) + The Coriolis force affects the paths of aircraft; missiles; flying birds; ocean currents; and, most important to the study of weather, air currents. Though the Coriolis effect does affect the airplanes directly, it is negligible.It only amounts to a very small percentage of course variation even over long flights. It has an indirect effect on the flight path by producing various phenomenon related to wind motion such as vortex winds, Jet streams etc. Pilot's must do proper preflight planning to account for the effect of Coriolis on winds over long distance flights 18. In Chapter 4, we learned that the closer the isobars, the stronger the pressure gradient and therefore the stronger the wind speed. Explain how this theory varies with latitude. (P37, lower right column) + The Coriolis effect is zilch at the equator and increases with latitude to a maximum at the poles. Consequently, for a given wind speed, the Coriolis force will be stronger at higher latitudes than at lower latitudes. For a given pressure gradient force (or height gradient), the geostrophic wind is defined to "blow" so that the Coriolis force exactly balances the PGF. Since the Coriolis effect increases with respect to latitude, it follows that for a given PGF, the wind speed needed to produce a balancing Coriolis force must be slower at higher latitudes to compensate for the greater Coriolis effect--that is, the same PGF implies a slower geostrophic wind at high latitudes and a faster geostrophic wind at low latitudes. For a given pressure gradient, as latitude increases wind speed decreases . 19. What is "Buys Ballot's Law"? (P38) + If you stand with your back to the wind in the Northern Hemisphere, the area of low pressure will be on your left 20. On most weather charts the isobars are separated by MBs. (P41) * 4 MBs
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