Most of GTA under severe thunderstorm WARNING

Areas in this warning are:
CITY OF TORONTO
HALTON HILLS - MILTON
MISSISSAUGA - BRAMPTON
CALEDON
YORK - DURHAM (all of it including Vaughan, Markham, Richmond Hill, Newmarket, Oshawa, Pickering, Uxbridge)
KITCHENER - CAMBRIDGE - REGION OF WATERLOO GUELPH - ERIN - SOUTHERN WELLINGTON COUNTY.
WINDSOR - ESSEX - CHATHAM-KENT
SARNIA - LAMBTON
LONDON - MIDDLESEX
WOODSTOCK - TILLSONBURG - OXFORD COUNTY