Deep convection 2

Wilfried Jacobs

DWD

Meteorological Training and Conference Centre

Purpose

• To enable you to interpretate small and meso scale structures in radar images identification of relevant structures

corresponding conceptual model( related weather)

Pre-requesites

Pre-reading of material in relation to

"Deep convection Part 2".

Content

1. Quiz based upon self study

2. Detailed investigations of radar images – (mainly super cells in relation to conceptual

models and "weather")• Intensities• Doppler

3. Quiz (time depending)

4. Questions & answers

1. Quiz (self study)

Single cell: Please, mark the correct answer(s) ( )

Multi cell: Please, mark the correct answer(s) ( )

Blueish: high reflectivities

Super cell: Please, mark the correct answer(s)

Blueish: high reflectivities

Please, mark the correct answer(s) ( )

Blueish: approachingRedish-pink: veering away

Please, mark the correct answer(s) ( )

Blueish: approachingRedish-pink: veering away

2. Examples conceptual models(Many Images from Peter Lang (DWD))

Super cells

Radar Berlin: 03 July 2003, around 15 UTC

1 km 3 km + 15 Min

RR2 km

Weak meso cyclone (06 June 2002, around 15 UTC, Feldberg / Black forrest)

Erroneous pixel? animations!

2 km

1 km

Ra

Rotation about 12m/s 6 km

Ra

18:25

Tornado of Wittenberg, 12.06.02, 18:15

No extreme dBz

R2 km

Rotation about 20 m/s

Hail near Munich (23 June 2008, about 13 UTC)

Hail near Munich (23 June 2008, around 13 UTC)

"tilted tower", hail in the upper part

Tornado possible

Hail near Munich (23 June 2008, around 13 UTC)Anvil

Prec, light at surface

Storm motion

WER

WER

Fine structures in super cells (dBz)

2 km

3 km

6 km

12 km

WER / inflow / strong echo gradient (horizontal)

hook echo

WER/ strong echo gradient (vertical)

Updraft

Outlow

FL : flanking line

RFD: rear-flank downdraft (often as Hook-echo)

FFD: Forward flank downdraft

Top: 12 km

FFD

RFD

FL

FL

Fine structures in super cells (Doppler)

2 km

4 km

6km

9 km

12 km

RFD

inflow

R

partly folding

Mini Tornado (15 June 2007, 16:15 UTC)

2 km radar Munich

R

2 km, radar HP

No clear rotation, line orientated shear stronger

R

Squall line

Hazardous weather over Southwest Germany (30 May 2008, 01 UTC)

Gus

tline

3 kmR

R

Folding

Gusts at least: (please tick ):

< 20 m/s

< 30 m/s

> 35 m/s 2 km

2 km

Single / multi cells

20:26 20:41 20:56 21:11

8 km

CON (1 km) DIV (8 km)

DIV 1 km

Weakening of a convective cell

Quiz

Where do you expect a flanking line? (please mark ( ))

2 km

3 km

Where do you expect a WER ? (please mark ( ))

2 km

3 km

WER

6 km

FL : flanking line

RFD: rear-flank downdraft (often as Hook-echo)

FFD: Forward flank downdraft

Where do you find the outflowwith possibly precipitation hail (please mark ( ))?

Where do you expect the highest risk to tornado ? (please mark ( ))

Tornado possible

Difficult: Where is the inflow (please mark ( ))?

2 km

R

Where do you expect the outflow and possible precipitation (please mark ( ))

6km

R

Comming next

• "My Part deep convection 3"– Practical nowcasting

• Potential and weaknesses of data types (NWP, satellite, obs, radar) during nowcasting process

• Case studies among other during class room part

Thank you!Question?