44°31'N / 80°1'V / Altitudine 177 m / 12:52 18.05.2026, America/Toronto (UTC-4)
de la: 18.05.2026, 15:00
la: 19.05.2026, 02:00
Conditions are favourable for the development of squalls with wind gusts up to 45 knots and hail. Thunderstorms are expected to move eastward across the area this afternoon into this evening. ### Please continue to monitor alerts and forecasts issued by Environment Canada. For more information monitor Canadian Coast Guard radio or Weatheradio stations.
Southern Georgian Bay
Mariners are advised to prepare for potential squalls. Vulnerable vessels are most at risk and should seek safe harbour if underway.
Environment Canada
18.05.2026, 11:24
de la: 18.05.2026, 12:00
la: 19.05.2026, 02:52
Yellow warning - heat - in effect The first heat event of the season will begin this afternoon and is expected to continue into Tuesday. What: Daytime highs near 30 degrees Celsius. Humidex values near 36. Overnight lows of 18 to 20 degrees Celsius. When: Beginning this afternoon and continuing into Tuesday. Ending Tuesday night. Additional Information: Temperatures may be cooler along the lake shores. ### For more information: https://www.canada.ca/en/health-canada/services/climate-change-health/extreme-heat/how-protect-yourself.html https://www.canada.ca/en/health-canada/services/climate-change-health/extreme-heat/who-is-at-risk.html Please continue to monitor alerts and forecasts issued by Environment Canada. To report severe weather, send an email to [email protected] or post reports on X using #ONStorm.
Barrie - Collingwood - HillsdaleTake action to protect yourself and others – extreme heat can affect everyone’s health. Determine if you or others around you are at greater risk of heat illness. Check on older adults, those living alone and other at-risk people in-person or on the phone multiple times a day.
Watch for the early signs of heat exhaustion in yourself and others. Signs may include headache, nausea, dizziness, thirst, dark urine and intense fatigue. Stop your activity and drink water.
Heat stroke is a medical emergency! Call 9-1-1 or your emergency health provider if you, or someone around you, is showing signs of heat stroke which can include red and hot skin, dizziness, nausea, confusion and change in consciousness. While you wait for medical attention, try to cool the person by moving them to a cool place, removing extra clothing, applying cold water or ice packs around the body.
Drink water often and before you feel thirsty to replace fluids.
Close blinds, or shades and open windows if outside is cooler than inside.
Turn on air conditioning, use a fan, or move to a cooler area of your living space. If your living space is hot, move to a cool public space such as a cooling centre, community centre, library or shaded park.
Follow the advice of your region’s public health authority.
Plan and schedule outdoor activities during the coolest parts of the day.
Limit direct exposure to the sun and heat. Wear lightweight, light-coloured, loose-fitting clothing and a wide-brimmed hat.
Never leave people, especially children, or pets inside a parked vehicle. Check the vehicle before locking to make sure no one is left behind.Environment Canada18.05.2026, 10:52