How is a surface analysis chart used? ✔✔It is used to determine sky cover, the types of
clouds. SLP, pressure change, precip, temp/dew point, present wx, wind. They can be used to
locate the jetstream, turbulence, and wind shear.
What is the relationship between isobars and surface winds? ✔✔The closer the isobars
are together, the stronger the winds will be.
How often is a Weather depiction chart issued? ✔✔Every 3 hours
What is a weather depiction chart? ✔✔A weather chart to be used for flight planning by
giving an overall picture of the WX across the US.
,What is a Radar summary chart? ✔✔A radar summary chart is a graphically depicted
collection of radar weather reports.
Does the Radar summary chart depict forecast conditions, or observed conditions? How often?
✔✔Observed, hourly.
What specific information is depicted by the symbols and graphics?
fix ✔✔it displays areas of precip, height of tops, movement of cells, type of precip, echo
config, wx watches (severe wx)
What is the difference between visible and infrared Satellite imagery? ✔✔The visible images
display cloud cover. The infrared images display the earth in a manner that correlates with
temperature. Generally speaking, the warmer an object, the more infrared energy it emits.
What does water vapor imagery show on the Satellite imagery? ✔✔The water vapor images
display the earth in a manner that correlates to quantity of water vapor in the upper portions
of the atmosphere (25,000 feet and higher in general). The most useful information to be
gained from the water vapor images is the locations of storm systems and the jet stream.
What do the Valid Times indicate?
(on a prog chart) ✔✔12 and 24 hours. They indicate that the prog chart is valid for 12
hours from the time issued, or 24 hours from the time issued.
, How many times are Prog charts issued? ✔✔4 times a day. 00Z, 06Z, 12Z, 18Z.
Is a prog chart a forecast or a depiction of actual conditions? ✔✔Forecast.
Remember "to prognosticate" means "to forecast"
What kinds of weather/hazards are shown on the low level prog chart? ✔✔Precip, icing,
turbulence, thunderstorms, tropical storms, hurricanes IFR/MVFR conditions, areas of high/low
pressure, different types of fronts.
What is a cold front? ✔✔The leading edge of an advancing cold air mass
What clouds are associated with a cold front? ✔✔Cumulus and cumulonimbus
What weather is associated with a cold front? ✔✔Thunderstorms, hail, tornadoes
What discontinuities are associated with a cold front? ✔✔-Temp: Cold air advances
and overtakes warm air.
-Dewpoint:
-Wind: They move at about the speed of the wind component perpendicular to the front
just above the frictional layer.
-Pressure: Pressure usually rises abruptly.
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