Convective Outlook: Fri 30 Mar 2018
LOW
SLGT
MDT
HIGH
SVR
What do these risk levels mean?
Convective Outlook

VALID 06:00 UTC Fri 30 Mar 2018 - 05:59 UTC Sat 31 Mar 2018

ISSUED 19:27 UTC Thu 29 Mar 2018

ISSUED BY: Dan

Broad upper trough covers northwest Europe on Friday, with the upper low centre drifting from the Celtic Sea to the English Channel. Various features will be rotating around a multi-centred surface low over Biscay/northern France, adding complications between areas of convective potential vs bands of more dynamic precipitation. 


Given differences over timing and position of these features between various model guidance, it becomes difficult to pinpoint areas most favourable for lightning activity - in either case, it is not expected to be widespread, and generally rather isolated/sporadic given marginal instability.

In a general sense away from areas of showery rain, sufficient insolation and steep mid-level lapse rates will help generate a few hundred J/kg CAPE, capable of producing scattered showers - some perhaps weakly-electrified. Reluctant to issue a SLGT for previously mentioned reasons, but have included a low-end SLGT for parts of C + E Ireland where one or two isolated thunderstorms could occur during the afternoon, and perhaps another area of focus could be the Midlands towards Glocs/SE Wales - but very much dependent on the position and timing of the front approaching from the south. Some small hail will be possible with the strongest cells.