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Prairies: Severe storm threat before big cooldown, snow

The Weather Network logo The Weather Network 2019-05-15 Digital Writers
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The thunderstorm threat lingers across the Prairies through Wednesday with the risk largely spreading to Saskatchewan and Manitoba this time. The milder-than-average temperatures that are fueling that risk however, won't last for much longer. We take a look at the timing of these latest storms, which have the potential to become severe in nature for some, plus a colder pattern that will leave many stuck in the single digits this weekend, below.

WEATHER HIGHLIGHTS

  • Thunderstorm risk shifts to the eastern Prairies for Wednesday, some severe risk
  • Cooler temperatures to return late week; up to 10-degree drop for some
  • Cooler, unsettled pattern lasts into long weekend
  • Latest watches and warnings HERE

WATCH BELOW: THUNDERSTORM RISK EBBS AND FLOWS

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Warmer temperatures and instability in the atmosphere have been the perfect primer for thunderstorms on the Prairies this week. And while most storms that have developed have been non-severe in nature, we're closely watching a conditional threat for a few severe storms near the southern Saskatchewan and Manitoba border Wednesday afternoon and evening. That's as a narrow corridor of instability develops ahead of an advacing cold front.

The main threats with these storms include small hail and strong wind gusts, but some lingering cloud cover could limit daytime heating through Wednesday afternoon, which would then lower the severe risk as the day wears on.

"We may not end up seeing too much activity because of the amount of cloud that's forecast, but if we can get some clearing along the international border, we'll see storms that will want to try and spark around the late afternoon and evening hours," says Weather Network meteorologist Tyler Hamilton. "So we still can let our guards down at this point."

a close up of a map: PR thunderstorm risk baron 19-05-14 © Provided by Pelmorex Media Inc. PR thunderstorm risk baron 19-05-14

As moisture from B.C. gradually drifts eastward across the region, the storms in the south will be paired with showers for areas further north, with some receiving as much as 20 mm by Thursday.

a close up of a map: PR rain baron 19-05-14 © Provided by Pelmorex Media Inc. PR rain baron 19-05-14

TEMPERATURE DIVE INTO THE LONG WEEKEND, THREAT FOR SNOW IS BACK

Temperatures will remain seasonably warm through mid-week before a cooling trend drops temperatures back down by Thursday. Highs will fall by as much as 10 degrees for some spots between Monday and the end of the week, with those chillier temperatures expected to linger right through the long weekend.

a close up of a map: ab thur © Provided by Pelmorex Media Inc. ab thur

"We'll see a much cooler and more unsettled pattern for western Canada late week and into the long weekend and we're watching the potential for upslope snow into the foothills and possibly even into the Calgary area on Friday," says Weather Network meteorologist Dr. Doug Gillham.

Temperatures will stay well below seasonal through the long weekend across the Prairies and the "extended forecast for Calgary is especially chilly," Gillham warns.

Be sure to check back for the latest updates on the weather in your area.

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