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THUNDERSTORM 0056

 

Date: 28-06-2005
Time: 21:21 BST
Location:
Macclesfield, Cheshire UK
Type: Frontal Multicell
Documented by: Mark Seltzer
Equipment: Samsung VP-H65 Video Camera
Footage Quality:
VHS, DIGI

Storm Statistics: T0056.doc
Event Timeline: T0056events.xls

An anticipated system moving up from France brought with it some very active cumulonimbus cells imbedded within two separate fronts. In the north-west the first front produced some extraordinarily thick altocumulus of chaotic-sky nature as severe instability broke out ahead of the main front given away by plenty of castellanus (some giving precipitation).

Entry 02/06/2009: Rather than castellanus, this type of cloud when it thickened up may have a new name ("asperatus")
as explained by Cloud Appreciation Society founder Gavin Pretor-Pinney here: link to BBC news

Thunderstorms were already breaking out in this instability fuelled by the warm temperatures of the day, and they also started breaking out along the parent front behind it. By the time the activity reached Macclesfield the two waves had merged to form a large-scale deluge of heavy rain over the north-west region. As the system became frontal and widespread, so did the lightning, in which case it became sporadic and consisted mainly of upper-level discharges (I-Cs).

Therefore the lightning was difficult to capture as it was occurring all around the celestial dome and in places it was in call-and-response fashion, where a distant cell would flash then a closer cell would respond to it by flashing back. There were only a few close-by discharges, some with high-amp bassy thunders.

As the front progressed it dissipated in intensity and continued marching northwards.

DUNDEE SATELLITE IMAGES
(CREDITS)
VISIBLE 28.06.2005 16:49

VISIBLE 28.06.2005 16:49 + GRID
INFRARED 28.06.2005 16:49
INFRARED 28.06.2005 16:49 + GRID

INFRARED 28.06.2005 21:30
INFRARED 28.06.2005 21:30 + GRID


RAVENSTORM CREDITS