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WX 301 Test 2 With Questions And 100% ALL SURE ANSWERS
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Terms in this set (75)
Cold front: cold, dry air replacing warmer moist air
Warm front: warm, moist air replacing colder air
Stationary front: boundary between air masses is not moving
Occluded front: frontal boundary lifted above another frontal boundary
Station Plotting Model e.g., 243-->1024.3 mb; 982-->998.2 mb.
Obstruction to visibility is reported when the visibility is at or below 6 statute miles.
Sky cover
-Sharp change in temperature over short distance.
-Change in air's moisture content (dew point)
Characteristics of Front -Wind shift
-Pressure change and sharp change in curvature of isobars
-Clouds and precipitation near front
WX 301 Test 2
1/8
, Fronts tend to lie in troughs of low pressure
Pressure Tendency -Pressure tends to decrease as the front approaches the station (i.e. pressure tendency is falling).
-Pressure tends to increase after the front passes (pressure tendency is rising).
Satellite First Weather Satellite launched in 1960
Measures radiant energy emitted or reflected by the Earth'surface and clouds, or emitted by the
Passive remote sensor
Earth's atmosphere, depending on the channel wavelength.
-Satellite Turns with Earth (always views same spot)—allows for creating animations to view time
evolution of weather features
Geostationary -Orbit requires satellite to be at extremely high ~19,000 nm
-Lower resolution
-Most typically used for aviation
-Much lower orbit ~ 400-600nm
-Higher resolution
Polar Orbiting -"sun-synchronous"—orbits over poles while earth turns underneath
-Only scans a single swath at a time
-Satellite orbits Earth every 101 minutes
-Visible images show "reflected" sunlight
Visible Satellite Images -Different types of clouds and terrain reflect sunlight differently
-Must have sunlight! Cannot typically get visible images at night (moonlight images do exist)
Visible Images Surface Reflectivity All surfaces reflect varying amounts of sunlight
Thunderstorms --> Bright white
Surface Reflectivity Thin clouds --> Gray
Oceans --> Black
Small clouds and thin clouds may appear gray
Gaps between small clouds allow some of the Earth's reflected energy through, when averaged
Visible Images with the clouds, the clouds appear grayer than normal
Thin clouds allow most of sun's energy to pass through, reflecting very little sunlight, again
appearing gray
WX 301 Test 2
2/8
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