Chapter 3
5 stages of a baroclinic low
prewave stage, wave initiation stage, wave intensification, occluded stage, dissipating stage
warm air advection between 1000-500pha indicates
fall SFC pressure
most intense and effective of all lifting mechanisms
orographic lifiting
elongated v shape troughs aloft have cloudiness and precip in what region
south
0- -8 c
clear icing
cycologenis will occur when and where an area of upper level divergence becomes superimposed over a low level frontal zone which exhibits weak thermal advection describes whos rule
Sverre Petterssen
2 adjacent air masses exhibit different temps and density and prevailing winds bring them together
frontogenesis
height at which a parcel of air if sufficiently heated from below will rise adiabatically until it is saturated
Convective condensation level
700 contours are perpendicular the weather will be
narrow
cirrus could lowering and thickening indicates
advancing warm front
lows tend to move with
the speed of the warm front and somewhat slower than the cold front
the temp of a parcel of air must be lowered to its dew point
condensation
parcel of air becomes saturated when it is lifted dry adiabatically
lifted condensation level
cirrus clouds form at what min temp?
-40c
-15 - -22c
rime icing
SFC pressures move with
upper level steering current
non adiabatic cooling results in
fog, light drizzle, dew
the lowest height in a layer to be mixed by wind stirring, at which saturation occurs after the complete mixing of the layer
MCL
cissocumlus, cirrostratus, cirrus
types of cirrus
cloud thickness of 400m-1000m
drizzle
how are lows deflected of a westerly current?
the left
downslope flow on the leeside of mountains results
adiabatic warming
temp minus the dew point depression
dew point
min height of freezing level for snow
1,200ft
-9 - -15c
mixed icing