Download Absolute stability Environmental lapse rate

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A ratio that compares the amount of
water vapour in the air to the
maximum water vapour capacity at
that temperature
The portion of atmospheric pressure that is
made up of water vapour molecules
(mb or kPa)
The relative humidity of saturated
air is 100%
SATURATION VAPOUR PRESSURE:
The pressure that water vapour molecules
would exert if the air were saturated
(at a given temperature)
RH = [H20 vapour content/H20 capacity] x 100
RELATIVE
HUMIDITY
SPECIFIC
HUMIDITY
Absolute stability
Environmental lapse rate <
moist adiabatic lapse rate
Environmental lapse rate >
Dry adiabatic lapse rate
Cooling
At MALR
6°C/km
Cooling
At MALR
6°C/km
X
VANCOUVER
8°C
Warming
At DALR
10 °C/km
Warming
At DALR
10 °C/km
Cooling
At DALR
10 °C/km
X
LETHBRIDGE
12°C
More sensible heat
Solar heating of Earth’s surface
Warm air advection at surface
Air moving over a warm surface
Cold advection
Radiational cooling of clouds
See weather.unisys.com
0600h GMT
APRIL 5
2003
NORTHEAST
WINDS
SHARP
COLD
FRONT
WARM,
MOIST
SOUTHERLY
FLOW
°
°
www.atmos.washington.edu
°
°
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