QUESTIONS AND CORRECT ANSWERS
GRADED A+
●● Observation procedures (SPECI).
Answer: A SPECI observation is an
unscheduled observation taken when any of the criteria listed are
observed. A SPECI observation shall contain the elements in a METAR,
plus additional
coded or plain language information that elaborates on the data in the
body of the
report. All SPECI shall be taken as soon as possible after relevant
criteria are observed. The element causing the SPECI shall be observed
last
●● Gust.
Answer: Rapid fluctuations in wind speed with a variation of 10 knots or
more
between peaks and lulls. Only reported if occurrence is within 10
minutes of the
observation time.
●● Squall.
,Answer: wind speed increases at
least 16 knots and is sustained at 22 knots or more for at least 1 minute.
●● Peak Wind Speed.
Answer: The highest instantaneous wind speed observed that exceeds 25
knots since the last METAR.
●● Variable Wind Direction.
Answer: • The wind is 6 knots or less
or
• during the 2-minute
evaluation period, the wind direction fluctuates by 60 degrees or more
and the wind
speed is greater than 6 knots
●● Wind Shift.
Answer: Change in wind direction of 45 degrees or more which takes
place in less than 15 minutes and has sustained winds of 10 knots or
more throughout the
wind shift.
●● Wind Evaluation/Hand Held (Direction Evaluation).
Answer: Averaging the observed wind
, direction over a 2-minute interval.
●● Wind Evaluation/Hand Held (Variable Wind Direction).
Answer: • The wind direction may be considered variable if,
during the 2-minute evaluation period, the wind speed is 6 knots or less
or
• If during the 2-minute evaluation period, it varies
by 60 degrees or more when the average wind speed is greater than 6
knots
●● Wind Evaluation/Hand Held (Wind Speed).
Answer: The speed is determined by averaging the
observed speed, to the nearest knot, over a 2-minute period.
●● Wind Evaluation/Hand Held (Gust).
Answer: Observe the speed indicator on the instrument for a
period of 5 minutes to determine if gusts are occurring.
●● Prevailing Visibility.
Answer: The greatest visibility equaled or exceeded throughout at
least half the horizon circle, which does not necessarily have to be
continuous. This
definition applies to both surface and tower prevailing visibility