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 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

Radar Palette Home Click Doppler Post Cold Frontal 2 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 Surface Cold 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 WCB CCB Backing winds above the frontal zone indicative of anabatic cold front Behind the Cold Front Conceptual Models Left of the Col looking along the flow. The same backing winds make the warm front anabatic and active as well.

Radar Palette Home Click Doppler Post Cold Frontal 3 DCB to the Left of the Col C 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. o Right Wing Left 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.

Radar Palette Home Click Doppler Post Cold Frontal 4 The Cold Left Wing Climb CM This cold front is oriented NE-SW. Right Wing Left Wing o Click

Radar Palette Home Click Doppler Post Cold Frontal 5 Cross Section of Active Cold Front

Radar Palette Home Click Doppler Post Cold Frontal 6 Active or Anabatic Cold front

Radar Palette Home Click Doppler Post Cold Frontal 7

Radar Palette Home Click Doppler Post Cold Frontal 8

Radar Palette Home Click Doppler Post Cold Frontal 9

Radar Palette Home Click Doppler Post Cold Frontal 10

Radar Palette Home Click Doppler Post Cold Frontal 11 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

Radar Palette Home Click Doppler Post Cold Frontal 12 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 Surface Cold 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 WCB CCB Winds nearly straight above the frontal zone indicative of a cold front which is neither anabatic or katabatic Behind the Cold Front Conceptual Models Centered on the Col looking along the flow.

Radar Palette Home Click Doppler Post Cold Frontal 13 DCB Centred on the Col C 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. o Right Wing Left 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

Radar Palette Home Click Doppler Post Cold Frontal 14 The Cold Screaming Eagle CM This is a placeholder for a real example. o Right Wing Left Wing

Radar Palette Home Click Doppler Post Cold Frontal 15

Radar Palette Home Click Doppler Post Cold Frontal 16

Radar Palette Home Click Doppler Post Cold Frontal 17

Radar Palette Home Click Doppler Post Cold Frontal 18

Radar Palette Home Click Doppler Post Cold Frontal 19

Radar Palette Home Click Doppler Post Cold Frontal 20

Radar Palette Home Click Doppler Post Cold Frontal 21 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

Radar Palette Home Click Doppler Post Cold Frontal 22 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 Surface Cold 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 WCB CCB Veering winds above the frontal zone indicative of katabatic cold front Behind the Cold Front Conceptual Models Right of the Col looking along the flow.

Radar Palette Home Click Doppler Post Cold Frontal 23 DCB Centred on the Col C 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 CM The 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. o Right Wing Left 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

Radar Palette Home Click Doppler Post Cold Frontal 24 The Cold Left Wing Dive CM This is a placeholder for a real example. o Right Wing Left Wing

Radar Palette Home Click Doppler Post Cold Frontal 25 Cross Section of Inactive Cold Front

Radar Palette Home Click Doppler Post Cold Frontal 26 Inactive or Katabatic Cold Front

Radar Palette Home Click Doppler Post Cold Frontal 27 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 Surface Cold 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 WCB CCB Veering winds above the frontal zone indicative of katabatic cold front

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

Radar Palette Home Click Doppler Inactive or Katabatic Cold Front

Radar Palette Home Click Doppler Post Cold Frontal 30 Vertical Deformation Zone Distribution and the CBM Summary C C C C C DCB CCB DCB C

Radar Palette Home Click Doppler Post Cold Frontal 31 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.