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Post Cold Frontal 1Radar Palette Home Click Conventional
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
Click for the Conceptual Model and Explanation
Post Cold Frontal 2Radar Palette Home Click Conventional
Cold Frontal Conceptual Models
• Katabatic Cold Front• Cloud pattern
A
B
Post Cold Frontal 3Radar Palette Home Click Conventional
DCB
Cold Frontal Cross-section along Poleward Branch of the Dry Conveyor
Belt (DCB)
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?)
Mixing Zone
SurfaceCold Front
Frontal slope is shallower than the typical 1:50
WCB oriented for
less frontal lift
Common area for shallow instability if any
A
B
A B
WCB just ahead of cold front also typically backs with height
WCBCCB
Veering winds above the frontal zone indicative of katabatic cold front
Radar Palette Home Click Conventional
Cross Section of Inactive Cold Front
The cold frontal cloud tends to be ahead of the inactive, katabatic cold front
Radar Palette Home Click Conventional
Inactive or Katabatic Cold Front
Post Cold Frontal 6Radar Palette Home Click Conventional
Post Cold Frontal 7Radar Palette Home Click Conventional
Post Cold Frontal 8Radar Palette Home Click Conventional
Post Cold Frontal 9Radar Palette Home Click Conventional
Post Cold Frontal 10Radar Palette Home Click Conventional
Post Cold Frontal 11Radar Palette Home Click Conventional
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
Click for the Conceptual Model and Explanation
Post Cold Frontal 12Radar Palette Home Click Conventional
Cold Frontal Conceptual Models
• Cold Front neither Anabatic or Katabatic
• Cloud patternA
B
Post Cold Frontal 13Radar Palette Home Click Conventional
DCB
Cold Frontal Cross-section along Poleward Branch of the Dry Conveyor
Belt (DCB)
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?)
Mixing Zone
SurfaceCold Front
Frontal slope is shallower than the typical 1:50
WCB oriented for
less frontal lift
Common area for deep instability
A
B
A B
WCB just ahead of cold front also typically backs with height
WCBCCB
Veering winds above the frontal zone indicative of katabatic cold front
Post Cold Frontal 14Radar Palette Home Click Conventional
Post Cold Frontal 15Radar Palette Home Click Conventional
Post Cold Frontal 16Radar Palette Home Click Conventional
Post Cold Frontal 17Radar Palette Home Click Conventional
Post Cold Frontal 18Radar Palette Home Click Conventional
Post Cold Frontal 19Radar Palette Home Click Conventional
Post Cold Frontal 20Radar Palette Home Click Conventional
Post Cold Frontal 21Radar Palette Home Click Conventional
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
Click for the Conceptual Model and Explanation
Post Cold Frontal 22Radar Palette Home Click Conventional
Cold Frontal Conceptual Models
• Anabatic Cold Front• Cloud pattern A
B
Post Cold Frontal 23Radar Palette Home Click Conventional
DCB
Cold Frontal Cross-section along Poleward Branch of the Dry Conveyor
Belt (DCB)
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
Mixing Zone
SurfaceCold Front
Frontal slope is steeper than the typical 1:50
WCB oriented for
less frontal lift
Common area for deep instabilityA
B
A B
WCB just ahead of cold front also typically veers with height
WCBCCB
Backing winds above the frontal zone indicative of anabatic cold front
Radar Palette Home Click Conventional
Cross Section of Active Cold Front
The cold frontal cloud tends to be ahead of and behind the active, anabatic cold front
Radar Palette Home Click Conventional
Active or Anabatic Cold front
Post Cold Frontal 26Radar Palette Home Click Conventional
Post Cold Frontal 27Radar Palette Home Click Conventional
Post Cold Frontal 28Radar Palette Home Click Conventional
Post Cold Frontal 29Radar Palette Home Click Conventional
Post Cold Frontal 30Radar Palette Home Click Conventional
Vertical Deformation Zone Distribution and the CBMSummary
C
C
C
C
C
DC
B
DCB
CCB
DCB
C
Post Cold Frontal 31Radar Palette Home Click Conventional
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.
