|Convective Outlook: Fri 23 Jun 2017|
|What do these risk levels mean?|
VALID 06:00 UTC Fri 23 Jun 2017 - 05:59 UTC Sat 24 Jun 2017
ISSUED 09:54 UTC Fri 23 Jun 2017br> br>
ISSUED BY: Dan
On the southern flank of the upper vortex north of Scotland, strong westerly flow and cold advection will steepen lapse rates on Friday night, with scattered showers containing a low risk of lightning - more especially towards Shetland where the greatest mid-level lapse rates will be.