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Pre-warm Frontal 1Radar Palette Home Click Conventional
Ahead of WCB
• Classic area for virga• Probability of virga increases with strength and
dryness of the CCB and the strength and moisture of leading branch of the WCB
• Katabatic portion of warm front
Click for the Conceptual Model and Explanation
Pre-warm Frontal 2Radar Palette Home Click Conventional
WCB
CCB
Warm Frontal Cross-section along Leading Branch of the Warm Conveyor
Belt (WCB)
Cold air in Cold Conveyor Belt (CCB) deep and dry
Moist portion of Warm Conveyor Belt (WCB) is high and veered from frontal perpendicular – katabatic tendency
Dry lower levels of WCB originate from ahead of the system and backed from frontal perpendicular
Mixing Zone
SurfaceWarm Front
Frontal slope is more shallow than the typical 1:200
Precipitation extends equidistant into the unmodified CCB
Precipitation extends further into the moistened, modified CCB
Increasing CCB Moistening
WCB oriented for
maximum frontal lift
WCB oriented for
less frontal lift
Virga Precipitation
Lower
Hydrometeor
Density
Common location for virga A
B
A B
WCB typically veers with height (it is after all, a warm front)
Link to ClassicExample
Pre-warm Frontal 3Radar Palette Home Click Conventional
Vertical Deformation Zone Distribution and the CBMSummary
C
C
C
C
C
WC
B
DCB
CCB
DCB
C
Pre-warm Frontal 4Radar Palette Home Click Conventional
Inactive or Katabatic Warm Front
Pre-warm Frontal 5Radar Palette Home Click Conventional
Ahead of WCB Ex 3C
Pre-warm Frontal 6Radar Palette Home Click Conventional
Pre-warm Frontal 7Radar Palette Home Click Conventional
Pre-warm Frontal 8Radar Palette Home Click Conventional
Pre-warm Frontal 9Radar Palette Home Click Conventional
Pre-warm Frontal 10Radar Palette Home Click Conventional
Pre-warm Frontal 11Radar Palette Home Click Conventional
Under WCB
• Virga only likely on the leading edge of the WCB• The CCB is becoming increasingly moist• Frontal overrunning and isentropic lift is
increasing thus increasing the intensity of the precipitation process.
• Warm front becoming more likely Anabatic
Click for the Conceptual Model and Explanation
Pre-warm Frontal 12Radar Palette Home Click Conventional
WCB
CCB
Warm Frontal Cross-section along Central Branch of the Warm Conveyor
Belt (WCB)
Cold air in Cold Conveyor Belt (CCB) more shallow and moist
Moist portion of Warm Conveyor Belt (WCB) is thicker, higher and perpendicular to front
Lower levels of WCB have the same origin as the upper level of the WCB - frontal perpendicular
Mixing Zone
SurfaceWarm Front
Frontal slope is near the typical 1:200
Precipitation extends further into the moistened, modified CCB. Horizontal rain area begins to expand as CCB moistens.
Increasing CCB Moistening
WCB oriented for
maximum frontal lift
Virga Precipitation
Lower
Hydrometeor
Density
Common location for virga A
B
A B
WCB shows little directional shift with height. A greater WCB depth is frontal perpendicular
PrecipitationAt Surface
Pre-warm Frontal 13Radar Palette Home Click Conventional
Vertical Deformation Zone Distribution and the CBMSummary
C
C
C
C
C
WC
B
DCB
CCB
DCB
C
Pre-warm Frontal 14Radar Palette Home Click Conventional
Active or Anabatic Warm Front
Pre-warm Frontal 15Radar Palette Home Click Conventional
Pre-warm Frontal 16Radar Palette Home Click Conventional
Pre-warm Frontal 17Radar Palette Home Click Conventional
Pre-warm Frontal 18Radar Palette Home Click Conventional
Pre-warm Frontal 19Radar Palette Home Click Conventional
Pre-warm Frontal 20Radar Palette Home Click Conventional
Pre-warm Frontal 21Radar Palette Home Click Conventional
Behind WCB
• Virga much less likely• The CCB has become moist• Frontal overrunning and isentropic lift is
maximized thus maximizing the intensity of the precipitation process.
• Warm front is likely Anabatic
Click for the Conceptual Model and Explanation
Pre-warm Frontal 22Radar Palette Home Click Conventional
WCB
CCB
Warm Frontal Cross-section along Trailing Branch of the Warm Conveyor
Belt (WCB)
Cold air in Cold Conveyor Belt (CCB) even more shallow and more moist
Moist portion of Warm Conveyor Belt (WCB) is thicker, higher and backed from frontal perpendicular – anabatic tendency
Lower levels of WCB have the same origin as the upper level of the WCB
Mixing Zone
SurfaceWarm Front
Frontal slope likely steeper than the typical 1:200
Precipitation extends further into the moistened, modified CCB. Horizontal rain area expands rapidly as CCB moistened.
Increasing CCB Moistening
WCB oriented for
maximum frontal lift
Virga Precipitation
Lower
Hydrometeor
Density
Common location for virga A
B
A B
WCB probably backs slightly with height in spite of the warm air advection. A greater WCB depth is frontal perpendicular
PrecipitationAt Surface
Pre-warm Frontal 23Radar Palette Home Click Conventional
Vertical Deformation Zone Distribution and the CBMSummary
C
C
C
C
C
WC
B
DCB
CCB
DCB
C
Pre-warm Frontal 24Radar Palette Home Click Conventional
Active or Anabatic Warm Front
Pre-warm Frontal 25Radar Palette Home Click Conventional
Behind WCB
Pre-warm Frontal 26Radar Palette Home Click Conventional
Behind WCB
Pre-warm Frontal 27Radar Palette Home Click Conventional
Behind WCB
Pre-warm Frontal 28Radar Palette Home Click Conventional
Behind WCB
Pre-warm Frontal 29Radar Palette Home Click Conventional
Behind WCB
Pre-warm Frontal 30Radar Palette Home Click Conventional
Behind WCB
Pre-warm 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.