Fog, Showers and Thunderstorms Move In as Blocking Pattern Takes Hold
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Monday brought two very different versions of summer weather to Newfoundland and Labrador. That contrast is being driven by an easterly flow off the Atlantic, which continues to push fog and low cloud onto eastern-facing coastlines. More moisture will arrive Monday night as an area of low pressure approaches from the south, spreading fog, drizzle and eventually rain into a larger portion of Newfoundland.
Rain and thunderstorms possible Tuesday
Showers will move onto the Burin and Avalon peninsulas Tuesday morning before expanding across more of the Island by midday.
The eastern half of Newfoundland will also face the risk of showers and thunderstorms during the afternoon. Any storms that develop could produce frequent lightning, gusty winds and intense downpours. Rainfall rates could briefly approach 30 mm per hour beneath the strongest showers.
Western Newfoundland should see the best weather Tuesday. While a few scattered showers remain possible, there will be less fog, some sunny breaks and warmer temperatures near the West Coast.
Labrador will also face a risk of afternoon showers and thunderstorms, with locally heavy rain, lightning and gusty winds possible.
Labrador heat continues—for now
Heat warnings remain in effect for parts of central and coastal Labrador, where temperatures will once again approach 30°C Tuesday.
The heat will begin to ease in some areas during the next couple of days, although Happy Valley-Goose Bay may remain hot through Wednesday. A more noticeable cooldown arrives Thursday, but temperatures could return to the middle or upper 20s around Upper Lake Melville by the weekend.
A stubborn weather pattern develops
The bigger story is a blocking high over Greenland that will slow the movement of weather systems around Atlantic Canada.
Areas of low pressure will repeatedly develop or track near Newfoundland and Labrador, but the Greenland block will prevent them from moving away quickly. The counterclockwise flow around those lows will frequently direct cool, damp Atlantic air toward eastern and northeastern Newfoundland.
That does not mean every day will be a washout. There will be sunny breaks between areas of showers, drizzle and possible thunderstorms. However, it will be difficult for eastern Newfoundland to find any sustained summer heat.
Temperatures in eastern and central Newfoundland will generally remain in the upper teens or lower 20s through the next week. Western Newfoundland should fare better, with daytime highs frequently reaching the lower or middle 20s.
The Northern Peninsula and coastal Labrador will also remain on the cooler side, while Labrador West faces repeated opportunities for showers and thunderstorms. Upper Lake Melville will be the exception, with warmer temperatures potentially returning by the weekend.
In short, the upcoming pattern will be changeable rather than consistently wet—but if you are looking for prolonged heat and sunshine, western Newfoundland and parts of central Labrador will be your best bets.
The next forecast update will be tomorrow morning! Check back for updates!
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Thanks Eddie