WUCN13 CWTO 250230 SEVERE THUNDERSTORM WARNING ISSUED BY ENVIRONMENT CANADA. REGIONAL CENTRE TORONTO ONTARIO. 10.30 PM EDT MONDAY 24 AUGUST 1998. SEVERE THUNDERSTORM WARNING ISSUED FOR.. REGIONAL MUNICIPALITY OF NIAGARA. A PARTICULARLY INTENSE CELL NEAR GRIMSBY COULD PRODUCE SEVERE WEATHER MAINLY IN THE FORM OF DAMAGING WINDS LARGE HAIL VERY HEAVY RAIN AND DANGEROUS LIGHTNING. THERE IS ALSO THE RISK OF A FUNNEL CLOUD OR A TORNADO. THE CELL WILL MOVE SLOWLY EASTWARD ALONG THE SOUTHERN SHORE OF LAKE ONTARIO. THIS IS A WARNING THAT SEVERE THUNDERSTORMS ARE IMMINENT OR OCCURRING IN THESE REGIONS. REMEMBER SOME SEVERE THUNDERSTORMS PRODUCE TORNADOES..LISTEN FOR UPDATED WARNINGS. EMERGENCY MEASURES ONTARIO RECOMMENDS TAKING COVER IMMEDIATELY WHEN THREATENING WEATHER APPROACHES. THIS WARNING IS IN EFFECT UNTIL 12.30 AM.