On Sep 23, 11:03 am, "Martin Rowley"
wrote:
A potent looking upper trough driving tonight's development arriving
from the west: wonder if we'll see any tornadic development?

http://www2.wetter3.de/Animation_06_UTC/24_7.gif
[ 500 hPa vorticity advection ]

http://www2.wetter3.de/Animation_06_UTC/24_6.gif
[ 500 hPa vertical velocity ]

Also, indication of local high rainfall totals - Ensemble output
suggests at least 15 mm for our location (East Dorset), and
deterministic ~20 mm; further north, even higher (6hr) totals are
predicted:

http://www2.wetter3.de/Animation_06_UTC/24_4.gif
[ 6 hr PPN accumulation ]

should easily bring to an end the 35 day spell of quiet, dry weather -
and bring a few leaves down as well - nice start to the new working
week!

So what is the difference between whatever fronts cause tornadoes and
with squall lines?

Altitude?

Looks like Google is screwing up again.