The Weather Network – Heat and humidity will fuel threat of severe storm in Quebec on Wednesday
Wednesday, July 14, 2021, 7:36 a.m. – Persistent heat and humidity will fuel a threat of severe thunderstorms over southern Quebec on Wednesday.
The summer motif that blankets eastern Canada is not going anywhere in a hurry. Hot, humid air will provide the energy needed to fuel a risk of thunderstorms over a wide swath of Quebec on Wednesday. Some storms in southern Quebec could become severe, posing the risk of torrential rain, strong gusts of wind and small hail. More information on the serious threat and what to expect this weekend, below.
WEDNESDAY: POSSIBLE STRONG THUNDERSTORMS IN SOUTHERN QUÉBEC
Hot and humid with a risk of a thunderstorm – this is a pattern we are familiar with at this point. But familiarity doesn’t make the risks of a rowdy afternoon thunderstorm any less serious.
A surface trough moving over the northeastern United States will advance into southern Quebec during the day on Wednesday, providing the lift and trigger for thunderstorms to develop in the unstable parked air. above the region.
Any thunderstorm that forms in eastern Ontario and southern Quebec could reach severe levels, posing a risk of small hail, strong wind gusts and torrential rain. This threat includes Ottawa, Gatineau, Montreal and Quebec.
A quick glance at humidx values on Wednesday removes much of the mystery of what is driving the threat of strong to severe thunderstorms. Southwesterly winds surrounding a Bermuda high pressure area over the western Atlantic Ocean continue to blow warm, heavy air over eastern Canada.
Daytime highs will reach the upper 20s throughout southern Quebec, with humidx values reaching the mid-30s during the afternoon heat.
THURSDAY: THE SEVERE THREAT IS DECREASING, BUT THE THUNDERSTORM IS STILL POSSIBLE
The surface trough responsible for bringing thunderstorms to severe limits on Wednesday will shift east on Thursday, removing the trigger mechanism that would help thunderstorms reach their full potential.
The heat and humidity could still give rise to ordinary thunderstorms across Quebec, but we should not see a widespread risk of severe weather as we saw on Wednesday.
Thursday appears to be our hottest day, with daytime highs approaching 30 ° C in southern Quebec and humid values reaching the upper 30s for most of the region.
THIS WEEKEND: THE TIMES ARE GOING A LITTLE BUT THE HUMIDITY AND THE RAIN ARE ATTACKING
A center of depression moving over the Great Lakes will bring our next chance for active weather in southern Quebec. The low will push through northern Ontario on Thursday and reach the interior of Quebec by Friday.
The cold front extending from this low will move slowly towards southern Ontario and southern Quebec by the end of the week, bringing the possibility of showers and thunderstorms on Friday and Saturday.
In addition to the risk of precipitation, the limit will reduce temperatures to seasonal for the weekend and next week. However, stubborn humidity levels will always make the 30s feel like low to mid-range throughout the region.
Be sure to check out the latest news on the serious threat in Quebec.