Poleward DCB
• The DCB tends to rise isentropically turning cyclonically
• Typically in the dry slot of the comma pattern
• Winds typically back with height above the cold frontal
surface
• The cold frontal slope is steeper than the average 1:50
• Cold front is likely Anabatic
• Precipitation returns will be limited in extent
• Precipitation will tend to be very cellular
• This results in an incomplete display of the Doppler wind
field in particular
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Cold Frontal Conceptual Models
• Anabatic Cold Front
• Cloud pattern
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B
A
Dual Polarized Post Cold Frontal 2
Cold Frontal Cross-section along
Poleward Branch of the Dry Conveyor
Belt (DCB)
B
Common area for deep instability
A
DCB
CCB
Surface
Cold Front
WCB
B
A
Cold air in Cold Conveyor Belt (CCB) deep and moist
Warm Conveyor Belt (WCB) is deep, warm and moist
CCB backs with height consistent with cold advection
WCB just ahead of cold front also typically veers with height
Frontal slope is steeper than the typical 1:50
Backing winds above the frontal zone indicative of anabatic cold front
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Cross Section of Active Cold Front
The cold frontal cloud tends to be ahead of and behind the active, anabatic cold front
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Active or Anabatic Cold front
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Under DCB
• This is the portion of the DCB pointing directly at
the col in the associated deformation zone.
• It is almost a straight line flow separating
cyclonic curvature to the left (poleward) from
anticyclonic curvature to the right (equatorward)
• There is typically a dry delta pattern just
upstream from the col location
• The cold frontal slope is likely to be close to the
average 1:50
• Cold front is neither Katabatic or Anabatic
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Dual Polarized Post Cold Frontal 11
Cold Frontal Conceptual Models
• Cold Front neither Anabatic or
Katabatic
• Cloud pattern
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A
B
Dual Polarized Post Cold Frontal 12
Cold Frontal Cross-section along
Poleward Branch of the Dry Conveyor
Belt (DCB)
Common area for deep instability
A
DCB
B
CCB
Surface
Cold Front
WCB
B
A
Cold air in Cold Conveyor Belt (CCB) shallow and dry
Warm Conveyor Belt (WCB) is shallow, warm and moist
CCB veers with height (consistent with warm advection – weakening cold advection?)
WCB just ahead of cold front also typically backs with height
Frontal slope is shallower than the typical 1:50
Veering winds above the frontal zone indicative of katabatic cold front
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Equatorward of DCB
• The DCB tends to sink isentropically as it
typically curls anticyclonically toward the south
• Typically along the equatorward tip of the
comma tail
• Winds typically veer with height above the cold
frontal surface
• The cold frontal slope is more shallow than the
average 1:50
• Cold front is likely Katabatic
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Dual Polarized Post Cold Frontal 17
Cold Frontal Conceptual Models
• Katabatic Cold Front
• Cloud pattern
A
B
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Cold Frontal Cross-section along
Poleward Branch of the Dry Conveyor
Belt (DCB)
Common area for shallow instability if any
DCB
A
B
CCB
Surface
Cold Front
WCB
B
A
Cold air in Cold Conveyor Belt (CCB) shallow and dry
Warm Conveyor Belt (WCB) is shallow, warm and moist
CCB veers with height (consistent with warm advection – weakening cold advection?)
WCB just ahead of cold front also typically backs with height
Frontal slope is shallower than the typical 1:50
Veering winds above the frontal zone indicative of katabatic cold front
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Cross Section of Inactive
Cold Front
The cold frontal cloud tends to be ahead of the inactive, katabatic cold front
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Inactive or Katabatic Cold Front
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C
DCB
Vertical Deformation Zone Distribution and the CBM
Summary
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Dual Polarized Post Cold Frontal 30
This must be and remain as Slide 31.
• The links to the three sections of the airflows
that comprise each of the conveyor belts are
located at Slide 1,11 and 21.
• Slide 11 is always the central, col limited
circulation.
• This leaves 10 PowerPoint slides for the
development of the training material which
should be more than adequate.
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Dual Polarized Post Cold Frontal 31