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21 Cards in this Set

  • Front
  • Back
Warm Core Lows
Warmest air in center
Upper level ridge or closed high
cyclonic circulation that weakens with height
no fronts
circulation aloft may reverse and go cyclonic around high
recieve their energy and warmth by intense heating
precip and clouds are sysmetrical
The three types of warm core lows
Tropical Warm core lows
found on -N of PFJ
500mb is Weak close low or trough
Intense convection wx and heavy precip
heated through latent heat of condensation
weakens with altitude
anticyclonic winds outflow in upper level to remove mass
Polar Lows
+N of PFJI
intense shallow convection or stratiform clouds with occasional intense precip
sensible heat and moisture are extracted from relatively warmer ocean
latent heat of
condenstation/deposition heats center
sometimes reaches Tropical strength
Heat Lows
-N of PFJ
500mb ridging
intense heating within middle tropics
subsidence and clear skies
very shallow and not well defined
will repostion to warmest sfc land or water
mid and upper ridge exists first
elevated heating produces afternoon thunderstorms
cT regions
Cold core lows
coldest at center
no front
cloudy skies with stratiform precip
minor short waves rotate around
may be equatorward or poleward of PFJ
cyclonic circulation
motion of parcel for potential temp
How do you identify systems?
1. Position of PFJ
2. 500 mb reflection
3. Temp Profile
4. Geographic location
Cut-off Low
-N of PFJ
Spring most prevalent
Jet cuts off
Name three things that happen to cut off low
1. remain stationary due to lack of vorticity and advection
2. retreat westward on equatorward side of subtropical high
3. new trough is introduced and provides PVA (called a kicker short wave)
Decaying Wave
+N of PFJ
Last stage of life cycle
deep and slow moving
in cold pockets
Two types of Cold Core Lows
Cut-Off low
Decaying wave
Warm Core Barotropic Highs
Cold SFC warm core
Subtropical high
-N of PFJ
convergence of Hadley and Ferrell cells
Near 30N
500 mb closed high with broad ridge
Cut-off highs
blocking highs
ridge forms ahd of major mid-lat cyclone
Two blocking regimes
Cold SFC Warm High
Plateu high
special case
pollution in air is stagnant
Flat snow covered high
cP and cA region
subsidence aloft
same area for long times
highter elevation 500mb trough
no front +N of PFJ
What is a Polar High?
Cold core high
Cold Core Highs
troughing exists in low levels
anticyclonic circulation weakens with height
stronger in low levels
ma become cyclonic in upper levels
no fronts
+N of PFJ
Baroclinic Lows
out of phase
stack back
stacks toward cold air
-Z of PFJ
500mb reflect 3-9 degree from sfc system
more vertical over time
Baroclinic Highs
axis tilts back toward warm air
+Z of PFJ
system is a result of a disturbance in the mid lat west flow
forms downstream form long wave trough and moves NE