Abundant storm energy brings flood and tornado risks Thursday
MUST SEE:
Severe storms are expected in multiple rounds Thursday afternoon and evening, and after several days of heat and humidity above 30°C, the abundant moisture in the region could result in torrential downpours. Conditions may also align for potential tornado development north of the Ottawa Valley, across the Laurentians, and in the Gaspé Peninsula. A tornado warning covered the Pembroke, Ont. area just before the lunch hour, but was discontinued shortly after. Tornado-warned storms are likely throughout the day.
You'll want to stay updated on the weather alerts in your area as conditions can change quickly when severe weather hits.
Thursday: Risk of strong thunderstorms with heavy downpours and a possible tornado
A low pressure system and a strong cold front will move through the Great Lakes Thursday, tracking eastward through the day. These conditions will bring the potential for severe thunderstorms in several areas, particularly in eastern Ontario, southern Quebec, and parts of the Maritimes.
Storms moving through the Greater Toronto Area (GTA) are expected to remain non-severe, as energy will peak further east ahead of the cold front by the afternoon.
This increased energy, combined with ample moisture and notable wind shear, could fuel a strong cluster of storms.
SEE ALSO:
North of the Ottawa Valley, severe storms could begin in the afternoon. By evening, areas including eastern Quebec, the Gaspé Peninsula, and northern New Brunswick will also face a severe weather risk.
Ottawa and Montreal residents should prepare for heightened storm intensity between 1–4 p.m., with the window extending from 1–7 p.m. for Quebec City and 3–9 p.m. for the Gaspé Peninsula and northern New Brunswick.
Locally intense rainfall is possible, with 50–100 mm expected in some areas due to thunderstorms.
This raises the risk of localized flooding. Conditions north of the Ottawa Valley, the Laurentians, and the Gaspé Peninsula may also support isolated tornadoes.
DON'T MISS:
It will be important to stay weather-aware throughout the day, and keep updated on any weather alerts or warnings issued in your area.
Following Thursday's storm threat, relief from the heat is on the way, as cooler, drier air moves in for Friday. A more comfortable and seasonal weekend is ahead.
WATCH: How storm chasers in Canada got into the action-packed job
Click here to view the video
Stay with The Weather Network for all the latest on conditions across Ontario and Quebec.
Hashtags
Try Our AI Features
Explore what Daily8 AI can do for you:
Comments
No comments yet...
Related Articles
Yahoo
21 hours ago
- Yahoo
Tornado, damaging wind risk in Ontario and Quebec; prepare in case of outages
Heat and humidity return to Central Canada, elevating the thunderstorm risk in both Ontario and Quebec Thursday. DON'T MISS: Several lines of severe thunderstorms are expected to develop as humidity and instability peak during the afternoon and evening hours. Key factors driving this weather include moisture, instability, wind shear, and a low pressure system acting as a trigger. While the main risks are hail, heavy downpours and potent, potentially damaging wind gusts, there is a chance of rotation and one or two tornadoes for parts of northeastern Ontario, Lake Huron-Georgian Bay shores and Quebec. Make sure you keep an eye on the radar––especially if you have outdoor plans––and stay aware of any severe weather watches or warnings issued in your area. Thursday: Severe storm threat bubbles up with the rising humidity and instability Southern and eastern Ontario will experience humidex values near 40°C during the afternoon, with dry conditions likely until storms develop in the evening hours. SEE ALSO: Timing: 4-5 p.m. Thunderstorm activity is expected to begin as early as 4–5 p.m. in northeastern Ontario and parts of Quebec, where severe weather has the highest confidence. Early-stage storm development may lead to isolated, rotating cells capable of producing tornadoes, particularly in Quebec. Heavy rainfall is also a significant risk, with totals exceeding 50 mm locally due to multiple storm cells passing over the same areas. Localized flooding is a concern. RELATED: 7-8 p.m. As storms mature, a transition to a more linear pattern is expected, increasing the likelihood of damaging wind gusts between 90–100+ km/h, particularly along Georgian Bay and Lake Huron Shores from 7–8 p.m. onwards. Late evening and overnight: Thunderstorms may reach the northern Greater Toronto Area (GTA) during the late evening or overnight hours, but will weaken as energy diminishes. DON'T MISS: Rainy periods could persist into Friday morning for parts of the GTA. WATCH: In a tornado warning? Here's what you should do Click here to view the video Signs of cooler weather for the August long weekend Early next week, conditions will stay mostly sunny, hot, and humid, accompanied by a chance of passing thunderstorms. A strong cold front is expected to sweep south through the region midweek, bringing a heightened risk of thunderstorms. By late next week, cooler air will settle in, with temperatures expected to remain below seasonal averages through the August long weekend and into the first week of the month. However, a return to significantly warmer weather is anticipated for the second week of August. Stay with The Weather Network for more information and updates on your weather across Ontario and Quebec.
CBS News
a day ago
- CBS News
Drier air moves in after round of scattered showers across South Florida
Scattered showers and storms will move across South Florida on Thursday before drier air moves in just in time for the weekend. The chance of rain will be highest in the morning through the midday hours, with the potential for some heavy downpours and localized flooding. The atmosphere remains juicy and unstable due to an upper-level area of low pressure which has led to all the wet weather over the last few days. Afternoon highs will climb to the low 90s, but when the humidity is factored in, it will feel like the upper 90s and 100s. There is a moderate risk of rip currents along the Atlantic beaches and the UV index is extreme. There are no alerts or advisories for boaters over the Atlantic or Keys waters. Late Thursday afternoon, a plume of Saharan dust will begin to move and storms will push inland and to the west. The drier air and high pressure will bring drier, hotter conditions on Friday and through the weekend. It will be a scorcher due to the lack of rain and cloud coverage. Highs will soar to the low 90s and it will feel like the triple-digits. The National Weather Service may issue heat advisories. Early to middle of next week the chance of rain rises with the potential for passing showers and a few storms. The National Hurricane Center is monitoring a trough of low pressure over the north-central Gulf that has a low potential (10% chance) of development as it moves generally westward across the north-central portion of the Gulf. Regardless of development, this system is expected to bring heavy rain and the potential for flooding along the Gulf coast.
CBS News
a day ago
- CBS News
Pittsburgh gets a return of hot and humid weather with storms closing out the week
Hot and humid weather is back today. Did you miss it? It's going to be around for a while with highs near 90° through at least Tuesday of next week. So if you want to impress friends and neighbors, here's a handy tip. WEATHER LINKS: Current Conditions | School Closings & Delays | Submit Your Weather Photos You can get a big tip on just how humid things are going to be by just looking at morning lows. The higher the humidity, the higher the dew point. The temperature can't fall below the dew point. So when we are humid, our morning temperatures are high. When more comfy air moves in, our morning temperatures can drop. So when checking out today's 7-day forecast, you can really see when the humid air will be in place. The other big story is a return of downpours and the risk of flash flooding that is coming our way, and arriving on Friday. Not everyone is going to see big rain totals, but those who do will have a chance for flash flooding. Any storms during the afternoon will bring frequent lightning and some gusty winds. Our severe weather chances right now look marginal at best, but can't be ruled out. When it comes to the forecast, highs today should hit the low 90s in most places. Rain chances should be enough to keep highs in the mid to upper 80s on Friday, Saturday, and Sunday, with morning lows in the mid to low 70s due to how humid it will be. Rain chances on each of those days will be isolated to scattered with downpours possible. Monday rain chances look to be in the isolated range, with scattered rain chances back on Tuesday and Wednesday. Temperatures will return to be near or just below average the rest of next week. Stay up to date with the KDKA Mobile App – which you can download here!
