Lesson 25

Question 1

Terminal Aerodrome Forecast (TAF)

Answer 1

a concise statement of the expected meteorological conditions significant to aviation for a specified time period within 5 SM of an airport.

Question 2

TAFs issued by the NWS provide a forecast of what meteorological elements:

Answer 2

• wind
• visibility
• significant weather
• cloud and vertical obscuration
• non-convective low-level wind shear (LLWS)

Question 3

What are the 3 forms of TAFs?

Answer 3

Routine, Amended, Corrected

Question 4

Routine TAFs are issued _____ times a day. (provide the time intervals)

Answer 4

4; @ 0000,0600,1200,1800Z

Question 5

When are TAFs amended?

Answer 5

whenever they become, in the forecaster’s judgment, unrepresentative of existing or expected conditions

Question 6

Routine TAFs are valid for either ___ or ___ hour time periods.

Answer 6

24; 30

-Example: 0106/0206 (‘beginning day of the month, beginning hour UTC’/’ending day of the month, ending hour UTC’)

Question 7

TAF Visibility

Answer 7

• 6SM = Visibility 6
• P6SM= Visibility more than 6

-will only go to 6, never a digit higher

Question 8

TAF Visibility

Answer 8

• 6SM = Visibility 6
• P6SM= Visibility more than 6

-will only go to 6, never a digit higher

Question 9

NSW

Answer 9

No Significant Weather

Question 10

Decode:

WS020/12035KT

Answer 10

example of a non convective low level wind shear (LLWS)
included when a LLWS is expected within 2,000 ft of the surface
– “Low Level Wind Shear, Wind at Two Thousand, one two zero at three five”

Question 11

TEMPO

Answer 11

used to indicate temporary fluctuations to forecast meteorological conditions

Question 12

PROB30

Answer 12

• used to forecast a low probability (30 percent chance) of a thunderstorm or precipitation event and its associated weather elements (wind, visibility and/or sky condition)
• located within the same line as the prevailing condition group, continuing on the line below if necessary
• “a 30 percent probability between….”

Question 13

SIGMETs, Convective SIGMETs, and AIRMETs are _________.

Answer 13

“inflight advisories”

Question 14

Significant Meteorological Information (SIGMET)

Answer 14

a weather advisory concerning weather significant to the safety of all aircraft

• unscheduled product issued any time conditions reaching SIGMET criteria are occurring or expected to occur within a 4 hr period
• max valid period of 4 hrs

Question 15

Significant Meteorological Information (SIGMET)

Answer 15

a weather advisory concerning weather significant to the safety of all aircraft

• unscheduled product issued any time conditions reaching SIGMET criteria are occurring or expected to occur within a 4 hr period
• max valid period of 4 hrs

Question 16

Convective SIGMET (WST)

Answer 16

weather advisory concerning convective weather significant to the safety of all aircraft

• issued for thunderstorms
• issued hourly at 55 minutes past the hour
• valid for 2 hrs or until superseded by the next hourly issuance

Question 17

Airmen’s Meteorological Information (AIRMET)

Answer 17

an inflight advisory concerning weather phenomena which are of operational interest to all aircraft and potentially hazardous to aircraft having limited capability because of lack of equipment, instrumentation, or pilot qualifications

Question 18

AIRMET SIERRA

Answer 18

for IFR and extensive mountain obscuration

Question 19

AIRMET TANGO

Answer 19

for moderate turbulence, sustained surface winds greater than 30 knots, and non convective low level wind shear (LLWS) potential

Question 20

AIRMET ZULU

Answer 20

for moderate icing and freezing levels

Question 21

How long are AIRMETs valid?

Answer 21

for no more than 6 hours

Question 22

Center Weather Advisory (CWA)

Answer 22

an unscheduled weather advisory issued by CWSU meteorologists for ATC use to alert pilots of existing or anticipated adverse weather conditions within the next 2 hrs.

Question 23

LOW IFR

Answer 23

defined as ceiling less than 500 ft AGL and/or visibility less than one statute mile

Question 24

LOW IFR

Answer 24

defined as ceiling less than 500 ft AGL and/or visibility less than one statute mile

Question 25

Meteorological Impact Statement (MIS)

Answer 25

an unscheduled discussion product issued by CWSU meteorologists that summarizes anticipated weather conditions with potential impact on air traffic flow control and flight operations in an ARTCC’s area of responsibility

Question 26

A _____ is NOT intended to be used by pilots.

Answer 26

MIS

Question 27

Wind and Temperature Aloft Forecast (FB)

Answer 27

a computer generated forecast of wind direction, wind speed, and temperature at selected times altitudes and locations
– used by ATC to vector aircraft