Analysis Of Weather Charts Flashcards
What is the mean sea level chart?
Lines of equal pressure made from observations at 3am, 9am and 3pm
What is the difference between the MSLP prognosis and analysis chart?
Analysis is now, prognosis is in the future.
What is the general spacing of isobars on mean sea level chart?
2 or 4 hPa
What two SIGWX charts are available ?
Medium (10,000 ft to FL250)
High (FL250 to FL630)
What is the validity time for SIGWX charts?
3 hours either side of states validity time.
What does XXX mean on a SIGWX chart?
Below 10,000 ft or FL250 depending on the chart
What winds do SIGWX charts provide?
Jet Streams
What three levels of Grid Point Weather and Temperature charts are provided?
Low (1000 ft to FL140)
Medium (FL050 to FL240)
High (FL180 to FL450)
How often are GPWT charts issued?
Every 6 hours
What is validity period for GPWT charts?
- For low level, 1.5 hours either side of stated validity time.
- For medium and high level, 3 hours either side of stated validity time.
In a wind and temperature chart, what does a pennant, feather and half feather mean?
Pennant = 50 kts
Feather = 10kts
Half feather = 5kts
What wind and temperature data is displayed in a wind and temperature chart?
Weather at a particular altitude/ flight level
Where are wind and temperature charts issued and what is validity period?
- 6 hourly intervals
- validity period is +-3 hours either side of validity time.
What is a SIGMET and what are the two forms it can exist in?
SIGMET provides urgent in flight advice to aircrew of en route weather phenomena that could be hazardous to the aircraft flight.
What are the two forms of SIGMETs?
- Text
- Graphical
