ahead of wcb within the warm sector

Warm Sector 1Radar Palette Home Click Doppler

Ahead of WCB within the Warm Sector

These conceptual models will be virtually identical to those associated with the three locations north of the warm front with the exceptions that:

• There will be and cannot be any evidence of the cold conveyor belt

• The veering and backing with height signatures will be less pronounced

• The reduced extent of warm sector precipitation will be an issue

• Gulls are found in the warm sector, more so than eagles… Click for the Conceptual Model and Explanation


WCB

CCB

Cross-section along Central Branch of the Warm Conveyor Belt (WCB) totally

within the WCB

Content under development

Mixing Zone

SurfaceWarm Front

Increasing CCB Moistening

WCB oriented for

maximum frontal lift

Virga Precipitation

Lower

Hydrometeor

Density

A

B

A B

PrecipitationAt Surface


Right of the WCB in the Warm Sector

o

C

Within the WCB:•East of radar veering, warm advection•West of radar nil VWS

Within the PBL:•Probable Ekman spiral near surface resulting in slight veering with range

The Headless Right Wing Stoop CM

The headless gull’s right wing is folded in as if it is about to swoop down.The left wing is still fully extended to catch the lift of the WCB.

Right W

ing

Left

Wing

Signature ofEkman Spiral


The Headless Right Wing Stoop CMThis slide is reserved for an actual radar example.

o Right W

ing

Left

Wing


Under WCB

• This is totally within the warm sector• Only the WCB is sensed• Cloud and precipitation streets will be sensed

Click for the Conceptual Model and Explanation


WCB

CCB


within the WCB


Mixing Zone

SurfaceWarm Front

Increasing CCB Moistening

WCB oriented for

maximum frontal lift

Virga Precipitation

Lower

Hydrometeor

Density

A

B

A B



Within the WCB:•East of radar veering, weak warm advection – veering winds possible•West of radar backing, cold advection – backing winds possible

Under the WCB in the Warm Sector

o

Within the PBL:•Probable Ekman spiral near surface resulting in slight veering with range

The Headless Gull CM

Both wings are fully extended to catch the lift of the WCB. This is a straight line uniform wind field but could be a slightly divergent signature.

Right WingLeft Wing

Note that headless gulls can’t scream…The advections in the warm sector do not warrant this being called an eagle pattern.


The Headless Gull CMThe southwesterly WCB is essentially a straight flow but there are hints of the upper level divergence depicted in the conceptual model. o Right WingLeft W

ing


A

B

C

D

E

F

G

The Headless Gull CMThe southwesterly WCB is essentially a straight flow but there are hints of the upper level divergence depicted in the conceptual model.

o Right WingLeft Wing

•A and B and the black lines joining the inflexion points represent the top of the veering partly due to the Eckman spiral and perhaps some residual warm air advection. Note the A line is “sharper “ looking than B.•C to D represents a low level jet max. •Notice that outward from A and B and the inflexions the lines of constant radial velocity are nearly parallel( except for some slight backing from B to G) to the radials indicating constant wind direction. •We see a higher level jet max from E to F.


Behind WCB in the Warm Sector

Click for the Conceptual Model and Explanation


WCB


within the WCB


SurfaceWarm Front

A

B

A B

CCB

Mixing ZoneIncreasing CCB

Moistening

Virga Precipitation

Lower

Hydrometeor

Density

B



Left of the WCB in the Warm Sector

Within the WCB:•West of radar backing, cold advection•East of radar nil VWS

Within the PBL:•Probable Ekman spiral near surface resulting in slight veering with range o

The Headless Left Wing Stoop CM

The headless gull’s left wing is folded in as if it is about to swoop down.The right wing is still fully extended to catch the lift of the WCB.

Right Wing

Left

Win

g

C


The Headless Left Wing Stoop CMThis slide is reserved for an actual radar example. o

Right Wing

Left

Win

g


Behind WCB pre Cold Front


Behind WCB


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.

ahead of wcb within the warm sector

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