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MET (Winds (In NH the wind 'BACKS and SLACKS', In NH the surface…
MET
Winds
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In NH the surface wind will VEER in the day, BACK at night
Buys Ballot - "In NH with back to the wind, the LP is on the LEFT"
In the winter the polar front runs from ‘Florida to Folkestone’ and in the summer it runs from ‘Newfoundland to Norway’.
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TRS
- NA = 12
- Darwin = 2
- East Australia = 9
- South china sea = 16
- Disturbance - weak
- Depression - 20-33kt
- Storm (Gale = 1/2) - 34-63kt
- TRS - >= 64kt
Forecasting
- 6hrs generally
- 4hr SIGMET (6hr if VA or Trop Cyc)
- 4hr AIRMET
- TAF - every 3hrs (valid 6,9), every 6hrs if more
Surface Pressure Charts
- Low Level: below FL100
- Medium Level: FL 100 - FL250
- High Level: FL250 - FL630
- HVY SS < 200m
- MOD SS 200-500m
Cold Air Pool
- 200km
- 2-3 days
- High alt. cold air (10-30,000ft)
- Polar air push south
- Only on hi-level charts
Transiometer (RVR)
- 7.5ft / 120m
- 300 -1500 - 300
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Clouds
* :warning: Ceiling warning: >5/8
ITCZ
- 20N July / 20S Jan
- Average - Dakar - 0-5deg
Friction Layer
- Stability, wind speed, roughness of surface
Humidity
- RH = 100 - (T - Dp)*5
- RH = HMR / SMR
** HMR DOES NOT CHANGE WITH TEMP!!!!!
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