Weather 4 Flashcards
What information is provided by the Radar Summary Chart that is not shown on other
weather charts?
Lines and cells of hazardous thunderstorms
What weather phenomenon is implied within an area enclosed by red scalloped lines on a U.S.
High-Level Significant Weather Prognostic Chart?
Moderate or severe icing
Moderate or Severe Turbulence
The U.S. High-Level Significant Weather Prognostic Chart forecasts significant weather for
what airspace?
25,000 feet to 63,000 feet.
What is the upper limit of the Low Level Significant Weather Prognostic Chart?
24,000 feet.
A freezing level panel of the composite moisture stability chart is an analysis of
observed freezing level data from upper air observations
The difference found by subtracting the temperature of a parcel of air theoretically lifted from
the surface to 500 millibars and the existing temperature at 500 millibars is called the
lifted index
Hatching on a Constant Pressure Analysis Chart indicates
windspeed 70 knots to 110 knots.
What flight planning information can a pilot derive from Constant Pressure Analysis Charts?
Winds and temperatures aloft.
From which of the following can the observed temperature, wind, and temperature, wind and temperature/dew-point spread be determined as a specific altitude?
Constant Pressure Analysis Charts
The minimum vertical wind shear value critical for probable moderate or greater turbulence is
6 knots per 1,000 feet.
When turbulence causes changes in altitude and/or attitude, but aircraft control remains positive, that should be reported as
moderate
Turbulence that is encountered above 15,000 feet AGL not associated with cumuliform
cloudiness, including thunderstorms, should be reported as
clear air turbulence
Which type of jetstream can be expected to cause the greater turbulence?
A curving jetsam associated with a deep low-pressure trough
A strong wind shear can be expected
on the low-pressure side of a jetstream core where the speed at the core is stronger than 110
knots.
The Low Level Wind Shear Alert System (LLWAS) provides wind data and software process to
detect the presence of a
change in wind direction and/or speed within a very short distance above the airport.
One of the most dangerous features of mountain waves is the turbulent areas in and
below rotor clouds
Weather Advisory broadcasts, including Severe Weather Forecast Alerts (AWW), Convective SIGMETs, and SIGMETs, are provided by
Air Route Traffic Control Centers (ARTCC)
Frost covering the upper surface of an airplane wing Usually will cause
the airplane to stall at an angle of attack that is lower than normal
The National Convective Weather Forecast is a supplement to but does not substitute for, the
report and forecast information contained in
Convective Sigmets
Obtaining a weather briefing for a cross country flight. you receive what levels of convective activity in the convective outlook
Slight, Moderate and High
You are planning a cross-country flight across the United States. The flighl will be divided into
several segments. For flight planning, time enroute fuel requirements and air circulation are essential. In which direction does the air circulate around a low in the Northern Hemisphere?
ln the Northern Hemisphere, the air in an area around a low is deflected to the right and
circulates counterclockwise
Read MT 570 AT 159/65
The maximum tops of the cells Is Is 57,000 feet located 65 NM southeast of the station,
KOKC 1934
LN STRW++/+ 86/40
164160 199/115 15W C2425 MT 570 AT 159/65 2 INCH HAIL
KOKC at 19342,
area of echos 8/10 coverage, very heavy rain showers,
area defined by 86 degrees at 40NM, 164 degrees at 60NM, and 199 degrees at 115NM,
area 15NM wide, movement from 240 degrees at 25 knots, maximum tops 57,000 feet located at 159
degrees at 65NM, and 2 inch hail.
How Jong is the forecast of a Convective SIG MET valid for?
2 hours
