Radar Palet e Home Conveyor Belt CM Analysis & Diagnosis 1.

Analysis & Diagnosis 1Radar Palette Home Conveyor Belt CM


The Conveyor Belt Conceptual Model


The Warm Conveyor Belt (notes pages information)


The Poleward view along the warm conveyor belt


The View perpendicular to the warm conveyor belt


Cold Conveyor Belt - CCB


Dry Conveyor Belt - DCB


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 backs with height

WCBCCB

Backing winds above the frontal zone indicative of anabatic cold front


Preliminary Dry Conveyor Belt - PDCB


The Conveyor Belt Conceptual Model and Vertical Stability


Vertical Deformation Zone Distribution and the CBMSummary

C

C

C

C

C

WC

B

PDCB

CCB

DCB

C


The Conveyor Belt Conceptual Model and Frontal Characteristics – Anabatic - Katabatic


Anabatic and Katabatic Fronts Related to the CBCM

• Consider the winds in the warm air above the frontal surface and apply the principle of continuity

• If the winds back either above a warm or cold frontal surface, convergence results above the front and the air must rise

• If the winds veer either above a warm or cold frontal surface, divergence results above the front and the air must sink

• Anabatic and Katabatic fronts can be located using the Deformation Zone CM applied to the Conveyor Belt CM.

Radar Palette Home Conveyor Belt CM

Active or Anabatic Warm Front


Inactive or Katabatic Warm Front


Active or Anabatic Cold front


Cross Section of Active Cold Front


Inactive or Katabatic Cold Front


Cross Section of Inactive Cold Front


Conveyor Belt Conceptual Model and Conveyor Belt Characteristics


Vertical Deformation Zone Distribution and the CBMSimplified Summary

C

C

WC

B

PDCB

CCB

DCB

C

The WCB overrides the warm frontThe CCB undercuts the warm frontThe frontal surface overlies the mixing layerWind shear in the CCB is variable

Looking along the flow:•In WCB to the right of the Col expect veering winds with height – Katabatic warm front•In WCB approach to the right of the Col expect maximum divergence – the eagle pattern with ascent and increasing pcpn•In WCB to the left of the Col expect backing winds with height – Anabatic warm front


The Precipitation Area Conceptual Model and the CBCM

• The virga trick is a subset of the precipitation area conceptual model

• The precipitation area (reaching the ground) increases with:

• Increasing relative humidity of the CCB– CCB relative humidity is related to:

• CCB characteristics given the source region

• CCB moistening by precipitation (and/or surface characteristics)

• Increasing vertical dynamics and isentropic lift along the frontal surface.– Vertical dynamics is related to:

• Warm frontal slope

• WCB component perpendicular to the frontal surface

• Katabatic versus anabatic frontal diagnosis


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)


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.


WCB oriented for


Virga Precipitation

Lower

Hydrometeor

Density

Virga likely only on leading edge of WCB A

B

A B

WCB shows little directional shift with height. A greater WCB depth is frontal perpendicular

PrecipitationAt Surface


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.


WCB oriented for


Virga Precipitation

Lower

Hydrometeor

Density

Virga unlikely except along the leading edge of the WCB 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


The Precipitation Phase CM and the CBCM

• The precipitation area (reaching the ground) increases with:

• Increasing relative humidity of the CCB– CCB relative humidity is related to:

• CCB characteristics given the source region

• CCB moistening by precipitation (and/or surface characteristics)

• Increasing vertical dynamics and isentropic lift along the frontal surface.– Vertical dynamics is related to:

• Warm frontal slope

• WCB component perpendicular to the frontal surface

• Katabatic versus anabatic frontal diagnosis

• Add in a temperature parameter to deduce this.

Radar Palet e Home Conveyor Belt CM Analysis & Diagnosis 1.

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