Date: Monday 10th May 1999   Time: 16:30 BST
Macclesfield, Cheshire UK
Path: Overhead travelling ENE

Returning Polar Maritime trough
Duration: 15 minutes
Type: Singlecell / Compact Multicell
Average lightning type: Unknown
Average discharge rate: 120 seconds
Footage Quality:


This storm was a quickly developing cell, amongst a cluster of convectional cells that swept over rapidly during the day along a trough in a returning polar maritime airmass. Daytime heating. It gave about 7 thunders during it's passing and a decent small hail shower that lasted 2 minutes. The parent low pressure system was the same that produced T0022 a few days ago (initial front with possible plume). It was now very mature and hanging around in the Atlantic, with a decent track of cold air wrapping around the west side of it reaching the UK. Hence the decent instability. It was fairly windy which may have aided vertical wind shear.

The hail ranged between 5 and 7 millimetres in diameter.

The anvil development as it left the area was classic, with strong nuclear-style mushrooming at the rear end of the storm which was very photogenic.

VISIBLE 10.05.1999 14:18

INFRARED 10.05.1999 14:18
COLOUR 10.05.1999 14:18

VISIBLE 10.05.1999 19:23

INFRARED 10.05.1999 19:23
COLOUR 10.05.1999 19:23


CHARTS (Credits)

SFERICS (Credits)


Mark Seltzer  www.electricsky.co.uk


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