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?