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Weather Exam 2- WX 201 ERAU Questions and Answers

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Weather Exam 2- WX 201 ERAU Questions and Answers Radar Reflectivity The amount of energy received by the radar that is scattered back to it, usually by precipitation particles Attenuation Reduction of radar power by absorption of radiation by targets WSR-88D Weather Surveillance Rada...

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  • May 10, 2024
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Weather Exam 2- WX 201 ERAU Questions
and Answers
Radar Reflectivity
The amount of energy received by the radar that is scattered back to it, usually by precipitation
particles


Attenuation
Reduction of radar power by absorption of radiation by targets


WSR-88D
Weather Surveillance Radar 1988 Doppler


dopplar radar
specialized radar that can detect precipitation and movement of small particles and can approximate
wind speed


Aircraft Radar
Low power(300-500w), 3cm wavelength, more sensitive to precipitation, and more attenuation


Ground Radar
High power(750,000w), 10cm wavelength, less sensitive, and less attenuation


Warm Clouds
Clouds that have above-freezing temperatures at all levels


Cold clouds
clouds that have temperatures below freezing


collision-coalescence
The process by which cloud droplets merge to form raindrops


Factors influencing collision-coalescence
- Warm clouds
- Amount of water in the cloud, diversity of drop sizes, thickness of the cloud, updrafts in the cloud,
and electrical charges


Bergeron Process
- Cold clouds
- Growth of ice crystals through deposition
- Supercooled water, water vapor, and Ice crystals


supercooled water
water droplets having tempatures below freezing that remain in liquid state

, Supersaturated
increase the concentration of (a solution) beyond saturation point.


Riming
Supercooled water droplet freezes onto snowflake producing groupel


Aggregation
snowflakes or ice crystals combine


Graupel
soft, white balls of ice: snowflakes covered in rime


Virga
Precip that evaporates before hitting the ground


Sleet
Ice pellets that form when rain falls through a layer of freezing air


Freezing rain
raindrops that freeze after they hit the ground or other cold surfaces


Hail
precipitation of ice pellets when there are strong rising air currents


Adiabatic process
A process in which no heat is transferred to or from the system by its surroundings.


Air parcel
theoretical bubble of air, poor conductor of heat, adiabatic, not interact energetically with
environment


DALR
dry adiabatic lapse rate
10C per 1Km or 3C per 1000ft


SALR
the saturated adiabatic lapse rate, parcel cooling more slowly as it rises due to latent heat from
condensation


ELR
environmental lapse rate
2C per 1000ft is typical lapse rate


Pressure Gradient Force (PGF)

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