THUNDERSTORM T0067 Date: Saturday 21st October 2006 Time: 17:19
Macclesfield, Cheshire UK Path: Overhead
Returning polar maritime airmass, trough-driven line of
convection Duration: 40 minutes Type: Linear rearward-sloping Multicell Average lightning type: C-C Average discharge rate: 126 seconds
Footage Quality: SD 720i, DIGI
was having an afternoon siesta when this rolled up [clearly I was out the
night before]. I wasn’t expecting any
sort of thundery activity given the time of year, (inland areas are less
prone to vigorous daytime convection), and was therefore oblivious to the weather
scenario. I woke up and looked through the window to an ominous-looking
rolling arcus cloud with heavy rain curtains behind it. My immediate
response was to go online and look at some radar imagery and lightning maps to
see if any of it was active, which indeed it was. The cell that was
approaching Macclesfield by this time didn’t have any Sferic history yet,
but as there were a few active cells to the south I pointed the camera at it
anyway, given the way it looked on the horizon. I was right in doing so as
when it made a closer approach, it went bang.
Over the period of its
presence the storm gave five visible lightning discharges amongst some
hypnotic cloud formations. The discharges were on average every 2 minutes,
so steady. A “Whales Mouth” formation was evident with the
rolling arcus cloud in front of the main rain curtain.
Out of the five
discharges it dropped a nearby C-G which appeared to be streaked sideways in
the direction of the wind at the lower end of it, suggesting it was “ribbon”
lightning. It then beaded out ("bead lightning").
A couple more C-Cs
occurred after this.
The storm then fell silent as the tough took the band of rain northwest,
presumably because it lost its daytime heating input.