Four things you need to know about Tuesday
Tuesday, June 17, 2014, 7:08 AM - Wondering what you missed overnight or what you can expect for the day ahead?
Here's your weather briefing for Tuesday, June 17.
1. Nebraska braces for cleanup after tornado destruction
At least two people are dead after tornadoes touched down in northeastern Nebraska on Monday. Officials say up to three-quarters of Pilger, a town of about 350 people in northeast Nebraska, was destroyed.
Residents were evacuated Monday night, but were expected to return Tuesday morning to survey the damage and gather any immediate valuables.
TORNADOES IN CANADA: Everything you need to know
According to the U.S. National Weather Service, two twisters touched down within only a couple of kilometres of each other.
The severe weather also caused damage in the towns of Wisner, Stanton and Pender.
2. Severe storm threat in southern Ontario
A "potent disturbance" is approaching southern Ontario with showers and thunderstorms expected through the afternoon and evening hours.
"Heavy downpours, frequent lightning and gusty winds will probably be associated with many of the thunderstorms," warned Environment Canada in a special weather statement issued early Tuesday.
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According to Weather Network chief meteorologist Chris Scott, this could be the most significant severe storm threat for the region so far this year.
Heads-up Southern Ontario for Tuesday, most significant severe t-storm threat so far this year. Details sketchy, but watch close #onstorm— Chris Scott (@ChrisScottWx) June 16, 2014
"An organized complex of rain and thunderstorms with gusty winds and torrential downpours is expected to track across parts of southern Ontario on Tuesday," adds Weather Network meteorologist Doug Gillham. "The most likely timing for the GTA is during the afternoon. Depending on the timing on the system and the amount of sunshine that can occur before it arrives, scattered strong to severe thunderstorms may also develop ahead of the system."
3. Serious rainfall event for southern Alberta
"A slow moving system with a prolonged period of upslope flow against the Foothills in Alberta will lead to heavy rain with the threat for localized flooding across southern Alberta, especially in the Pincher Creek area," says Gillham. "Current indications are that the heaviest rain will fall Tuesday afternoon/evening and then diminish late Tuesday night into Wednesday morning."
Upwards of 100 mm of rain is expected in the hardest hit areas through Wednesday.
4. Heavy rain arrives one year following Alberta's devastating floods
It's been a year since the province was devastated by the worst flooding in Canadian history and several communities including Calgary, High River, Canmore and Bragg Creek are still feeling the effects.
Thirty-two states of emergency were declared across the province starting on June 19, 2013, as the flows of three major rivers rose to almost 10 times their normal rates.
Will this current rain event be as bad?
"One of the keys to the flood potential is whether the rain is relatively evenly distributed across the time period or whether convection enhances rainfall rates for a couple of hours over localized areas," explains Gillham.
Once you get into triple-digit rainfall forecasts over a three-day period however, localized flooding becomes a real possibility, adds Weather Network meteorologist Brett Soderholm.
"That said, Alberta has learned a lot since the 2013 floods and has contingency plans in place."