Met Practical Flashcards
Winds are shown on the GFA (Clouds & Weather) charts whenever they are forecasted to be ___kts or greater and visibility is shown when it’s forcasted to be ___sm or less.
20kts, 6sm
A dashed line enclosing an area of diagonal lines on a clouds and weather GFA chart represents…
showery precip
A scalloped border encloses organized areas of clouds, where the sky condition is either…
broken (BKN) or overcast (OVC).
On a GFA, how would you decode the following IFR outlook:
IFR CIG/VIS SN/BR/FG OVR NRN NF
IFR conditions, due to Ceilings/Visibility due to Snow/Mist/Fog Over Northern Newfoundland.
What are SIGMETS?
Weather warnings
- valid for 4hrs
- reporting hazardous flight conditions
- such as severe thunderstorms, icing, and turbulence
Aerodrome forecasts provide wind, visibility, weather and cloud heights that relate to flight ops within ___nm of the airport.
5nm
If TEMPO or PROB are included in the aerodrome forecast, can the airport be used as an alternate?
yes, but only if the TEMPO is not below your alternate minima and the PROB is not below the landing minima
What does the following line mean in a METAR?
R36/1000V2400FT/D
Runway 36 RVR between 1000’ and 2400’. Trent is downward.
A surface weather map shows conditions __ to __ hours before the map was issued.
2 to 3 hours
A surface weather chart show surface pressure patterns up to ___ ft.
3000ft
Review weather symbols
Name that front symbol?
Stationary frontolysis
(dashed lines between is frontolysis)
Name that front symbol?
Stationary front
Review these crazy pink symbols.
What are these two?
Trowel (top)
Ridge (bottom)
Review frontogenesis symbols, which have spaces between the symbols.
Name those front symbols?
Occluded front
Occluded frontolysis
Fronts and pressure centres depicted on P SIG WIX charts represent…
their surface positions at the validity time of the chart.
The term OCNL CB on a SIG chart means?
Embedded thunderstorms that are well seperated.
Name that symbol?
intermittent snow
Name that symbol?
Freezing drizzle, thunderstroms
Surface winds are not included in GFA when they are expected tom be less than ___.
20kts
SIGMETS can be received from ___ and are valid for ___ hours.
FSS, 4
The freezing level at 10,000’
Isotherm = a line on a map connecting points having the same temperature at a given time or on average over a given period.
What does “FRQ CB” mean?
thunderstorms with little or no separation
The term CB forecast for an area also automatically implies ___ even if those symbols are not used.
moderate or severe turbulence and icing
Upper wind (FDs) forecast state wind speed in ___ to the nearest ___ ° True.
Knots, 10°T
Decode the following upper winds
FL240 740538
- Add 50 to first two digits
- Add 100 to second two digits
- Last two digits are temp (minus is always assumed)
- 74 - 50 = 24 > 240° True
- 05 + 100 = 105 > 105kts
- 38 = -38°C
Upper Level Prog Charts are prepared for FL240, FL340 and FL450. They are issued ___ times a day and ___ hours before the validity times of 00Z, 06Z, 12Z, 18Z.
4 times | 12hrs
Clear Air Turbulence (CAT) associated with jet streams occurs when… (3 items)
- jet stream winds exceed 110kts
- significant curve or bend, especially around a deep pressure trough
- the jet stream passes just north of a surface frontal wave
A forcasted area of turbulence implies a ___% probability of encountering turbulence in that area.
50%
Jet streams are depicted on SIG WIX charts when their core speeds are forecast to attain ___kts or more
80
