THUNDERSTORM T0080 (Severe Linear MCS) Date: Thursday 12th May 2011 Time:
17:00-23:00 BST Location:
Lee Creek AK,
Smith AK, USA. Path: Overhead
Destabilised Tropical plume ahead of advancing tough, then
thundery surface front Duration: 5 hours (chase) Type: Multicell Average lightning type: CG / Anvil Crawlers Footage Quality: Full HD / DSLR
On the last day of
our self-catered stormchase holiday in the US, we ran out of supercells (2 weeks of high
pressure - there weren't many anyway) so we went full-on into a severe MCS (Mesoscale
Convective System) to see what spectacles that would give.
The storm started off
as an ambient group of elevated cells erupting out of Altocumulus Castellanus fields ahead of a trough.
A couple of hours later they upscaled and very quickly went
surface-based with CAPE values around 1500-2000J/kg. We had 3cm hail, whilst
Sallisaw town itself reported golf-balls, extreme downdraughts, lots
of lightning, big rainbows and adventurous rural roads at Lee Creek were
plenty to get our British adrenaline going. The day finished off with a
lovely display of anvil-crawlers, then the sneaky cold front we didn't know
was coming, followed by another C-G barrage before retiring in Fort Smith.