ERAU WX 201

WX 201 Exam 2 with correct Answers (Graded A) ____ is a condition in which the environmental lapse rate is equal to the dry adiabatic rate. Neutral stability The rate at which the actual air temperature changes with increasing height above the surface is referred to as the ____ rate. environmental lapse Absolute instability results when the environmental lapse rate is ____ the ____ adiabatic rate. greater than; dry An air parcel in an unstable atmosphere has ____ force acting ...

WX 201 Exam 2 with correct Answers (Graded A) An unsaturated air parcel cools or warms at what rate? Dry adiabatic lapse rate (DALR) A saturated air parcel cools or warms at which rate? Moist adiabatic rate (MALR) If the environmental lapse rate is greater than the dry adiabatic rate, the atmosphere is: Absolutely unstable Surface cooling and warm air advection aloft generally do what to the atmosphere? Make it more stable An air parcel starts to rise freely when it firs...

WX 201 Exam 2 with correct Answers (Graded A) large raindrops fall _____ smaller raindrops; and have ______terminal velocity than/as small raindrops a. slower than; a greater b. faster than; a greater c. faster than; a lesser d. at the same rate as; the same e. slower than; a lesser B the most likely time for an ordinary thunderstorm to form is a. just before sunrise b. late afternoon c. just after sunrise d. around midnight e. at noon B The region of a cloud where onl...

WX 201 Exam 2 with correct Answers (Graded A) Analysis Chart Depict actual data obtained at a given observation time Forecast Chart Computer model charts predicting future conditions of the atmosphere; surface charts and upper level charts are created Constant altitude charts All locations at the same altitude above ground level (for surface analysis, pressures are typically adjusted to MSL) Constant pressure charts all locations on the chart have the same pressure; contour l...

WX 201 Exam 2 with correct Answers (Graded A) Generally, the concentration of condensation nuclei is greater over the oceans than over land. False If a city receives 24 inches of snow, it is the equivalent to 18 inches of rain. False An important factor in the production of rain by the collision-coalescence process is the number of ice crystals in the cloud. False In a cloud composed of water droplets and ice crystals, the saturation vapor pressure is less over the droplets th...

WX 201 Exam 2 with correct Answers (Graded A) Reflectivity attenutation absorption of radiation by targets WSR-88D Weather Surveillance Radar 1988 Doppler, detects precip and atmospheric movement Doppler ability to detect the "shift in the phase" of an energy pulse aircraft radar less precise than WSR-88D ground radar elevated to avoid terrain, raises elevation angle 1 degree every 360 degree scan, probably wont give you full picture of scan, cone of silence wher...

WX 201 Exam 2 with correct Answers (Graded A) Dew is most likely to form on clear, calm nights Which two clouds can produce precipitation? cumulonimbus and nimbostratus If fog is forming in Denver, Colorado (located on the eastern side of the Rocky Mountains), and the wind is blowing from the east, then the fog is most likely upslope fog On a cold, winter morning, the most likely place for radiation fog to form is in a valley As Apollo 12 ascended into the atmosphere, th...

WX 201 Exam 2 with correct Answers What are constant pressure surfaces? Constant pressure at all points In regard to constant pressure surfaces, where do higher heights form? Over warm air In regard to constant pressure surfaces, what do high heights correspond to region wise? Regions of high pressure In regard to constant pressure surfaces, what will happen to the wind if the height gradient gets stronger? Wind will get stronger What height on the standard atmosphere re...

WX 201 Exam 2 with correct Answers Graded A+ At what time of day is the relative humidity normally at a minimum? when the air temperature is highest The time of day when the relative humidity reaches a maximum value is usually at the time when the air temperature is lowest. The instrument that measures humidity by measuring the amount of radiant energy absorbed by water vapor is the infrared hygrometer. The relationship between the mass of water vapor in an air parcel and the ...

WX 201 Exam 3 with correct Answers Graded A+ The land/sea breeze, lake, breeze, and mountain/valley breeze are examples of thermal circulations Longwaves in the middle and upper troposphere usually have lengths on the order of thousands of kilometers in the Northern Hemisphere, air found to the north of the polar front is______, while air further south is____ cold; warm the air mass with the highest actual water vapor content is mT because of friction, the surface winds ...