ACTUAL EXAM 400 QUESTIONS
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Terms in this set (174)
Every hour, or whenever the weather
How often are changes and necessitates a change.
METARs issues? In that situation, a SPECI (special
METAR) is issued.
, A special METAR which is created in
between the hourly METARs due to
a change in weather necessitating
the change.
What is a SPECI?
-Change of winds necessitating a
new runway.
-WX changing from IFR to VFR or
VFR to IFR.
Do METARs METARs depict actual field
describe actual conditions.
or forecast
conditions?
Shallow fog, ground fog. occurs on
clear nights, little or no wind, and
small temp/DP spread (high relative
Define Radiation humidity). Occurs at night or
fog daybreak. Radiation cools the
ground. The ground cools the air.
When the air is cooled to the dew-
point, fog forms.
This fog forms when moist air moves
Define
over colder ground or water.
Advection fog
Common along the coast.
, Air moving across a sizeable lake
absorbs water vapor.
Showers may appear on the leeward
What is lake
side if the air is colder than the
effect? Describe
water. If the air is warmer than the
one major
water, fog often develops on the
consequence of
leeward side. In the winter, lake
lake effect in
effect snow is a concern because as
winter.
a cold front passes over the warmer
lake water, snow, instead of showers
will occur.
What happens Small Temp/DP spread is essential to
when the the formation of fog.
Temperature/de
wpoint are very
close?
Valid for a 24-hour period, TAFs are
issued four times daily at 00Z, 06Z,
12Z, and 18Z, and updated as
How often are
conditions warrant. TAFs include
TAFs issued?
information about wind speed and
direction, visibility, present weather,
ceilings, and low-level wind shear.