VALID 06:00 UTC Fri 15 Apr 2016 - 05:59 UTC Sat 16 Apr 2016

ISSUED 08:26 UTC Fri 15 Apr 2016

ISSUED BY: Dan

Surface low will drift NE across southern England on Friday - on its northern flank, provided cloud breaks allow sufficient insolation to develop, combined with slack flow and low-level convergence, then there exists the potential for convection to form along zone of enhanced surface convergence. Instability is rather limited (couple hundred Jkg^-1 CAPE) but should be sufficient enough for some heavy showers to develop, with perhaps some sporadic lightning. Once again, slow storm motion brings the risk of local flash flooding issues (10-15mm in an hour), especially where shower-training occurs - particularly from south Midlands across Northern Home Counties to East Anglia. Backed surface winds may allow one or two funnels to form, with perhaps hail up to 1.0cm in diameter from any stronger cells.