Much of southern Ontario not in severe thunderstorm warning is under severe thunderstorm watch

Such places are (some are also under severe thunderstorm warning)

BELLEVILLE - QUINTE - NORTHUMBERLAND
CITY OF TORONTO
WINDSOR - ESSEX - CHATHAM-KENT
SARNIA - LAMBTON
ELGIN
LONDON - MIDDLESEX
OXFORD - BRANT
CITY OF HAMILTON
HALTON - PEEL
YORK - DURHAM
KITCHENER - CAMBRIDGE - REGION OF WATERLOO
GUELPH - ERIN - SOUTHERN WELLINGTON COUNTY
PETERBOROUGH - KAWARTHA LAKES
BANCROFT - BON ECHO PARK
HALIBURTON - MINDEN - SOUTHERN HALIBURTON COUNTY.