Station Name: Slate Island
Station Type: Buoy
Data Source: National Data Buoy Center

Elevation Above Sea Level: 179 meters

Nearest Address:
Terrace Bay Township, ON P0T 2W0
Thunder Bay District County

GPS Coordinates: 48.54, -86.95

Nearby Water Temperatures

squall watch in effect

Effective: Sun July 19, 2026, 7:55 PM
Expires: Mon July 20, 2026, 4:02 AM

Conditions are favourable for the development of squalls with wind gusts up to 45 knots, frequent lightning and hail. Thunderstorms capable of producing strong wind gusts and hail could move over the area later tonight. ### Large hail can damage vessels and cause injury. Please continue to monitor alerts and forecasts issued by Environment Canada. For more information monitor Canadian Coast Guard radio or Weatheradio stations.

Vessels without lightning protection should make their way to shore immediately. Mariners are advised to prepare for potential squalls. Vulnerable vessels are most at risk and should seek safe harbour if underway. Consider delaying or postponing travel in areas under the Squall Watch.

squall watch in effect

Effective: Sun July 19, 2026, 10:26 PM
Expires: Mon July 20, 2026, 6:34 AM

Conditions are favourable for the development of squalls with wind gusts up to 45 knots, frequent lightning and hail. Thunderstorms capable of producing strong wind gusts and hail could move over the area later tonight. ### Large hail can damage vessels and cause injury. Please continue to monitor alerts and forecasts issued by Environment Canada. For more information monitor Canadian Coast Guard radio or Weatheradio stations.

Vessels without lightning protection should make their way to shore immediately. Mariners are advised to prepare for potential squalls. Vulnerable vessels are most at risk and should seek safe harbour if underway. Consider delaying or postponing travel in areas under the Squall Watch.

squall watch in effect

Effective: Sun July 19, 2026, 10:26 PM
Expires: Mon July 20, 2026, 6:34 AM

Conditions are favourable for the development of squalls with wind gusts up to 45 knots, frequent lightning and hail. ### Large hail can damage vessels and cause injury. Please continue to monitor alerts and forecasts issued by Environment Canada. For more information monitor Canadian Coast Guard radio or Weatheradio stations.

Vessels without lightning protection should make their way to shore immediately. Mariners are advised to prepare for potential squalls. Vulnerable vessels are most at risk and should seek safe harbour if underway. Consider delaying or postponing travel in areas under the Squall Watch.

squall warning in effect

Effective: Sun July 19, 2026, 11:30 PM
Expires: Mon July 20, 2026, 3:30 AM

Thunderstorms are moving southeast across the region over the next few hours, squalls with wind gusts up to 50 knots and hail up to 3 cm in diameter are possible. ### Please continue to monitor alerts and forecasts issued by Environment Canada. For more information monitor Canadian Coast Guard radio or Weatheradio stations.

Vessels without lightning protection should make their way to shore immediately. Mariners are advised to prepare for squalls. If underway, seek safe harbour immediately. Take cover immediately, if threatening weather approaches.

yellow watch - severe thunderstorm - in effect

Effective: Sun July 19, 2026, 7:50 PM
Expires: Mon July 20, 2026, 7:01 AM

Conditions are favourable for the development of severe thunderstorms that may be capable of producing strong wind gusts and large hail. What: Wind gusts up to 100 km/h. Up to ping pong sized hail. When: Continuing into this evening and possibly overnight for some areas. Additional information: A warm front pushing through the region may bring severe thunderstorms. ### Large hail can cause significant damage and injury. Severe thunderstorm watches are issued when conditions are favourable for the development of thunderstorms capable of producing damaging hail, wind or rain. Please continue to monitor alerts and forecasts issued by Environment Canada. To report severe weather, send an email to ONstorm@ec.gc.ca or post reports on X using #ONStorm. For more information: https://www.ontario.ca/page/be-prepared-emergency.

When thunder roars, go indoors! Lightning kills and injures Canadians every year. Secure loose objects. Emergency Management Ontario recommends that you take cover immediately if threatening weather approaches.