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WX 201 EXAM 2 STUDY QUESTIONS
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WX 201 EXAM 2 STUDY QUESTIONS
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WX 201 EXAM 2 STUDY QUESTIONSAnalysis Chart - Answers-Depict actual data obtained at a given observation time
Forecast Chart - Answers-Computer model charts predicting future conditions of the
atmosphere; surface charts and upper level charts are created
Constant altitude charts - Answers-All locations at the same altitude above ground level
(for surface analysis, pressures are typically adjusted to MSL)
Constant pressure charts - Answers-all locations on the chart have the same pressure;
contour lines of equal height of the atmospheric column to that pressure level; typically
used for elevated levels of the atmosphere such as 700 and 500 mb
How are surface analyses created? - Answers--NOA/NWS is the primary source of data
in the U.S
-Identify: lows, highs, thoughts, ridges, fronts and station model symbols
Isobaric charts - Answers--Acquired through radiosondes, satellite, and aircraft
Upper Air Station Model - Answers-Temperature, wind, dew point, height
Standard Pressure Levels - Answers-1013mb- 0 ft
850mb- 5,000 ft
700mb- 10,000 ft
500mb- 18,000 ft
300mb- 30,000 ft
250mb- 39,000 ft
Location of jet streams - Answers--Bands of strong wind at tropopause level
-Clear air turbulence
- lead to development and movement of cyclones
Vertical Motion - Answers--Rising motion = air expands and cools = clouds and
precipitation may form if the air is sufficiently humid
-Sinking motion = air is compressed and warms= clearing skies
Sources of Vertical Motion - Answers-1. Convergence / divergence
2. Topography
3. Fronts
4. Convection
5. Wave motion
6. Turbulence
Convergence / Divergence - Answers--Convergence occurs when there is more inflow
to than outflow from a region (arrows pointing inward toward each other)
, -Divergence occurs when there is more outflow from than inflow to a region (arrows
away from each other)
-Sinking motion develops when there is convergence aloft with divergence at the
surface
-Rising motion develops when there is divergence aloft with surface convergence
What makes a cloud? - Answers-Water vapor, nuclei particles, cooling mechanism
Cloud condensation nuclei - Answers-Aerosols- sea salt, dust, carbon particles
Types of fog - Answers-1. radiation fog: forms in most air over ground at night as it
cools, light winds
2. advection fog: forms when warm, moist air rides over a cool water or ground, costal
areas, moderated wind
3. Steam fog (mixing): forms when cool air becomes located over a warm moist
unstable surface
4. upslope fog: form when warm, moist air glides up a mountain slope, dry and warmer
on lee side
Lifting Condensation Level (LCL) - Answers-LCL = T -DP / 2.5 C/1000ft
LCL = T- DP/ 4.4 F/1000 ft
Cloud types - Answers-1. Cumuliform: bumpy, heaped clouds, unstable air
2. Stratiform: layered clouds
Cloud Nomenclature - Answers-Nimbus = rain
Cumulus = heaped
Status = layered
Alto = middle
Cirrus = high
Geostationary satellites (GOES) - Answers-orbit above the equator over a fixed location
(the same rate the earth rotates)
35,800km from earth
continuous real time monitoring of a particular region
Polar orbiting satellites (POES) - Answers-orbit the earth from pole to pole scanning out
a swath of data as each rotates underneath
850km form earth
global coverage and higher resolution data
only captures same sport 2x daily
VIS Imagery - Answers--detects selected or scattered sunlight
-higher reflectivity
-indicated cloud shape, texture and opacity
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