III.C. Aviation Weather Reports and Forecasts Flashcards
How many times a day are TAFs issued?
And how long are they valid?
4 times a day
24 or 30 hours
List the 4 types of inflight aviation weather advisories.
SIGMET
CONVECTIVE SIGMENT
AIRMET
CENTER WEATHER ADVISORY (CWA)
What kind of weather is implied in a Convective SIGMET?
a. Severe or greater turbulence
b. Severe icing
c. Low level wind shear
What is a SIGMET, and how long is it valid for?
Advises of weather that is potentially hazardous to all aircraft.
4 hours
What kinds of weather phenomena would result in the issuance of a SIGMET?
a. Severe icing not associate with thunderstorms
b. Severe/Extreme turbulence, or Clear Air Turbulence
c. Dust storms, Sand Storms
d. Volcanic ash
What are the different types of AIRMETs?
Generally how often are they issued?
SIERRA: IFR conditions or mountain obscuration
(I can’t see, or Sierra Mountains)
TANGO: Moderate Turbulence, surface winds >30kt
ZULU: Moderate icing
Every 6 hours
What valuable information can be determined from a winds/temperature aloft forecast (FB)?
a. Favorable cruise altitude for winds
b. Areas of possible icing (air temperature aloft)
c. Temperature inversions (Possible stable layer)
d. Turbulence (abrupt change in wind direction and speed)
What is a Center Weather Advisory (CWA)?
Alerts aircrews to avoid areas of adverse weather conditions.
“Nowcast” pinpointing weather that is already causing an impact, or expected to within a 2-hour period.
Valid for maximum of 2 hours.
How many times per day is the Surface Analysis Chart produced?
Eight times daily.
What are the ceilings and visibility in LIFR conditions?
Low IFR: Ceiling less than 500ft, visibility less than 1sm.
What are the ceilings and visibility in IFR conditions?
IFR: Ceiling 500-1000ft, Visibility 1-3sm
What are the ceilings and visibility in MVFR conditions?
Marginal VFR: Ceiling 1,000-3,000ft, Visibility 3-5sm
What are the ceilings and visibility in VFR conditions?
VFR: Ceiling > 3,000ft, Visibility >5sm
