THUNDERSTORM T0049 Date: Wednesday 7th July 2004 Time: 01:09
Macclesfield, Cheshire UK Path: Overhead
Mid-level forced convection (in cold but well-mixed
preconditioned air-mass) Duration: 90 minutes Type: Multicell Average lightning type: C-C Average discharge rate: 69 seconds initially, easing to 100 seconds
Footage Quality: VHS
This was one of the most energetic night time storms Iíve filmed yet and the
only storm so far where I know Iíve captured the actual initial discharge. It
developed directly overhead in the slack flow at around 1:00am shortly after
T0048 had dissipated, likely forced from upper level feeding from the top of
the pre-mixed boundary layer of the daytime heating the day before, like
T0048, preceding a Spanish Plume system developing to the south over northern France.
Thunder was often high-amplitude and durable in nature, with large crawling
C-Cs, supporting higher cloud base and multi-cellular structure often
featured in mid-level storms.
At first this cell was
electrically silent but the precipitation was torrential overhead. Knowing that this
atmosphere was unstable to the trop I decided to
put the camera up in hope of catching something else for the night.
Shortly after I did so,
the first discharge of the cell (initiation discharge) happened in the form
of an overhead C-C followed by a powerful crash of thunder. Then within more or
less every minute there was another discharge, mostly crawling C-Cs.
The C-C shown above in particular was very bright
and was accompanied with a very loud thunder, even from a distance.
The following C-C was beautiful and tame in comparison showing a orb-fashioned shape.
A distinct line between the updraught and
downdraught was starting to become evident as C-C spiders danced just in
was confident there were minimal C-G strikes as the storm initiated just as
it left the area, giving a clear view of the whole main cloud base, however
the initiation discharge may have been an out-of-view C-G. The
storm was visible for more than an hour and a half as it slowly creeped its
way northwards giving some immense displays of C-C, often with ďcall and
responseĒ characteristics between two cells. The silhouette of a strong
bubbly updraught-base was also revealed as it left the area.
This next one is one of my favourites
from this storm; as well as lighting up the underside of the updraught base,
C-C had many branches before one connected with the
ground to finish the discharge off. Shame the tree was in the way.
This was one of the best
night-time storms Iíve filmed after T0011 and T0024. It was very easy to
film as the storm initiated overhead, giving some nice close-quarter action,
then the rain curtain immediately left the area leaving nothing but a dry,
calm wind lightshow. The entire line of cells
dissipated around about the time I stopped filming at 2:50am.