THUNDERSTORM T0038
Date: Saturday 4th August 2001
Time:
15:17 BST
Location:
Macclesfield, Cheshire UK
Path: Overhead
Synoptics:
Occlusion hook running into unstable air
Duration: 30 minutes
Type: Linear Multicell (likely outflow driven judging by arcus)
Average lightning type: C-C
Average discharge rate: 169 seconds
Footage Quality: VHS / Hi-8
This was one of the more unconventional thunderstorms you get when a
mini-occlusion (or cloud head / trough associated with a triple-point)
becomes more active when it runs into land and lifts warm air. This
particular cell formed on the top end of the trough/occlusion wave which
gave it a long leading-edge to its north side as it pivoted upwards. There
was evidence of a linear arcus cloud advancing north, so perhaps outflow
from the occlusion into the pre-existing unstable airmass triggered this
event.
The
discharges were almost all from under the base (no I-Cs) and composed of
weak C-Cs and a couple of C-Gs. It rolled right overhead and had a persistent
discharge rate showing uniform and steady development.
There was a stroke of luck
with one C-G shot which happened to the north of Macclesfield right in the
centre-frame of the camera, which incidentally was a new angle right after I
moved it from a C-C streak filmed to the south. The C-G appeared to fall
into dry air on the footage, but it was more likely that it was right on the
leading edge of the rain curtain which was just overhead at the time of
strike, as the visibility in the northerly direction was very good.
The
storm continued to do it’s thing as it rolled NE over the Pennines.
SATELLITE IMAGES (Credits)
VISIBLE 04.08.2001 14:07
VISIBLE 04.08.2001 14:07 + Grid
INFRARED 04.08.2001 14:07
INFRARED 04.08.2001 14:07 + Grid
CHARTS
(Credits)
SFERICS (Credits)
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