radar palette home click doppler post cold frontal 1 poleward dcb the dcb tends to rise...
TRANSCRIPT
![Page 1: Radar Palette Home Click Doppler Post Cold Frontal 1 Poleward DCB The DCB tends to rise isentropically turning cyclonically Typically in the dry slot of](https://reader035.vdocuments.us/reader035/viewer/2022070308/551be95d550346af588b62b7/html5/thumbnails/1.jpg)
Post Cold Frontal 1Radar Palette Home Click Doppler
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
Click for the Conceptual Model and Explanation
![Page 2: Radar Palette Home Click Doppler Post Cold Frontal 1 Poleward DCB The DCB tends to rise isentropically turning cyclonically Typically in the dry slot of](https://reader035.vdocuments.us/reader035/viewer/2022070308/551be95d550346af588b62b7/html5/thumbnails/2.jpg)
Post Cold Frontal 2Radar Palette Home Click Doppler
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 instability
A
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
Behind the Cold Front Conceptual ModelsLeft of the Col looking along the flow.
The same backing winds make the warm front anabatic and active as well.
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Post Cold Frontal 3Radar Palette Home Click Doppler
DCB to the Left of the ColC
Cold frontal surface
Mixing layer
Dry CB
Within the DCB:•West of radar backing, cold advection, Anabatic cold front•East of radar nil VWS or possibly weaker backing
Within the CCB – Cold Advection:•Cold advection probably overpowers the Ekman spiral signature
The Cold Left Wing Climb CM
The eagles left wing is folded backward having just caught more air for a climb.This portion of the DCB in the dry slot is typically ascending.The right wing is still fully extended to catch the lift of the WCB.
oRight Wing
Left
Win
g
The steeper frontal slope of the cold front will be very evident. Notice that the frontal area outlined is an oval skewed to the cold side of the front.
![Page 4: Radar Palette Home Click Doppler Post Cold Frontal 1 Poleward DCB The DCB tends to rise isentropically turning cyclonically Typically in the dry slot of](https://reader035.vdocuments.us/reader035/viewer/2022070308/551be95d550346af588b62b7/html5/thumbnails/4.jpg)
Post Cold Frontal 4Radar Palette Home Click Doppler
The Cold Left Wing Climb CMThis cold front is oriented NE-SW.
Right Wing
Left
Win
g o
Click
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Post Cold Frontal 5Radar Palette Home Click Doppler
Cross Section of Active Cold Front
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Post Cold Frontal 6Radar Palette Home Click Doppler
Active or Anabatic Cold front
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Post Cold Frontal 7Radar Palette Home Click Doppler
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Post Cold Frontal 8Radar Palette Home Click Doppler
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Post Cold Frontal 9Radar Palette Home Click Doppler
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Post Cold Frontal 10Radar Palette Home Click Doppler
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Post Cold Frontal 11Radar Palette Home Click Doppler
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
![Page 12: Radar Palette Home Click Doppler Post Cold Frontal 1 Poleward DCB The DCB tends to rise isentropically turning cyclonically Typically in the dry slot of](https://reader035.vdocuments.us/reader035/viewer/2022070308/551be95d550346af588b62b7/html5/thumbnails/12.jpg)
Post Cold Frontal 12Radar Palette Home Click Doppler
DCB
Cold Frontal Cross-section along Poleward Branch of the Dry Conveyor Belt (DCB)
Cold air in Cold Conveyor Belt (CCB) becoming less deep and less moist compared to the left of the flow
Warm Conveyor Belt (WCB) is still probably deep, warm and moist
CCB nearly a straight flow with weakening cold advection
Mixing Zone
SurfaceCold Front
Frontal slope is near 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 veers with height
WCBCCB
Winds nearly straight above the frontal zone indicative of a cold front which is neither anabatic or katabatic
Behind the Cold Front Conceptual ModelsCentered on the Col looking along the flow.
![Page 13: Radar Palette Home Click Doppler Post Cold Frontal 1 Poleward DCB The DCB tends to rise isentropically turning cyclonically Typically in the dry slot of](https://reader035.vdocuments.us/reader035/viewer/2022070308/551be95d550346af588b62b7/html5/thumbnails/13.jpg)
Post Cold Frontal 13Radar Palette Home Click Doppler
DCB Centred on the ColC
Cold frontal surface
Mixing layer
Dry CB
Within the DCB:•Nil VWS
Within the CCB – Cold Advection:•Cold advection probably overpowers the Ekman spiral signature
The Cold Screaming Eagle CM
Both of the eagle’s wings are fully extended.
oRight WingLeft Wing
The steeper frontal slope of the cold front will be very evident. Notice that the frontal area outlined is an oval skewed to the cold side of the front.
A B
![Page 14: Radar Palette Home Click Doppler Post Cold Frontal 1 Poleward DCB The DCB tends to rise isentropically turning cyclonically Typically in the dry slot of](https://reader035.vdocuments.us/reader035/viewer/2022070308/551be95d550346af588b62b7/html5/thumbnails/14.jpg)
Post Cold Frontal 14Radar Palette Home Click Doppler
The Cold Screaming Eagle CMThis is a placeholder for a real example. o
Right WingLeft Wing
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Post Cold Frontal 15Radar Palette Home Click Doppler
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Post Cold Frontal 16Radar Palette Home Click Doppler
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Post Cold Frontal 17Radar Palette Home Click Doppler
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Post Cold Frontal 18Radar Palette Home Click Doppler
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Post Cold Frontal 19Radar Palette Home Click Doppler
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Post Cold Frontal 20Radar Palette Home Click Doppler
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Post Cold Frontal 21Radar Palette Home Click Doppler
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
![Page 22: Radar Palette Home Click Doppler Post Cold Frontal 1 Poleward DCB The DCB tends to rise isentropically turning cyclonically Typically in the dry slot of](https://reader035.vdocuments.us/reader035/viewer/2022070308/551be95d550346af588b62b7/html5/thumbnails/22.jpg)
Post Cold Frontal 22Radar Palette Home Click Doppler
DCB
Cold Frontal Cross-section along Equatorward Branch of the Dry Conveyor Belt (DCB)
Cold air in Cold Conveyor Belt (CCB) shallow and dry. Precipitation will be lacking for radar coverage.
Warm Conveyor Belt (WCB) is shallow, warm and moderately moist
CCB probably veers backs with height consistent with warm advection … I know this seems odd.
Mixing Zone
SurfaceCold Front
Frontal slope is more shallow 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 veers with height
WCBCCB
Veering winds above the frontal zone indicative of katabatic cold front
Behind the Cold Front Conceptual ModelsRight of the Col looking along the flow.
![Page 23: Radar Palette Home Click Doppler Post Cold Frontal 1 Poleward DCB The DCB tends to rise isentropically turning cyclonically Typically in the dry slot of](https://reader035.vdocuments.us/reader035/viewer/2022070308/551be95d550346af588b62b7/html5/thumbnails/23.jpg)
Post Cold Frontal 23Radar Palette Home Click Doppler
DCB Centred on the ColC
Cold frontal surface
Mixing layer
Dry CB
Within the DCB:•Winds veer with range/height to the west•Katabatic cold front
Within the CCB – Cold Advection:•Cold advection probably overpowers the Ekman spiral signature
The Cold Left Wing Dive CMThe eagles left wing is folded forward as if it is about to turn to the right and swoop down. That is what this part of the DCB does.The right wing is still fully extended to catch the lift of the WCB.
oRight WingLeft Wing
The steeper frontal slope of the cold front will be very evident. Notice that the frontal area outlined is an oval skewed to the cold side of the front.
AB
![Page 24: Radar Palette Home Click Doppler Post Cold Frontal 1 Poleward DCB The DCB tends to rise isentropically turning cyclonically Typically in the dry slot of](https://reader035.vdocuments.us/reader035/viewer/2022070308/551be95d550346af588b62b7/html5/thumbnails/24.jpg)
Post Cold Frontal 24Radar Palette Home Click Doppler
The Cold Left Wing Dive CMThis is a placeholder for a real example. o
Right WingLeft Wing
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Post Cold Frontal 25Radar Palette Home Click Doppler
Cross Section of Inactive Cold Front
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Post Cold Frontal 26Radar Palette Home Click Doppler
Inactive or Katabatic Cold Front
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Post Cold Frontal 27Radar Palette Home Click Doppler
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
![Page 28: Radar Palette Home Click Doppler Post Cold Frontal 1 Poleward DCB The DCB tends to rise isentropically turning cyclonically Typically in the dry slot of](https://reader035.vdocuments.us/reader035/viewer/2022070308/551be95d550346af588b62b7/html5/thumbnails/28.jpg)
Radar Palette Home Click Doppler
Cross Section of Inactive Cold Front
The cold frontal cloud tends to be ahead of the inactive, katabatic cold front
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Radar Palette Home Click Doppler
Inactive or Katabatic Cold Front
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Post Cold Frontal 30Radar Palette Home Click Doppler
Vertical Deformation Zone Distribution and the CBMSummary
C
C
C
C
C
DC
B
DCB
CCB
DCB
C
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Post Cold Frontal 31Radar Palette Home Click Doppler
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.