The thunderstorm forecast is issued daily from April 1 to September 30.

Thunderstorm Forecast for Friday, July 3, 2020:

Canada:  Isolated-severe thunderstorms are possible in parts of southern and eastern Ontario, southern Manitoba, southern and NW Saskatchewan, and northern Alberta on Friday. With the most unstable CAPE (MUCAPE) values reaching as high as 5000 j/kg and pockets of moderate wind shear, these storms will be in an area with enough instability to create supercells, as well as hail measuring between 2 and 5 cm, heavy downpours, and damaging wind gusts up to 100 km/h are possible with these discrete and/or semi-discrete thunderstorms.  There is a possible funnel cloud risk in northern Alberta, and the NW Saskatchewan border with Alberta.

                                                      

These storms likely will remain mostly as isolated-severe on Friday due to pockets of low - moderate levels of CIN. This is because these pockets of low - moderate levels of CIN, could potentially slow the speed of the MUCAPE, and instability altogether, which would reduce the possibility of experiencing prolonged severe storms, if any at all depending on the how limiting the low - moderate levels of CIN will be on Friday. 

Non-severe thunderstorms are forecasted for multiple areas in the country on Friday.  Small hail measuring <2 cm, wind gusts up to 90 km/h, and isolated flooding may occur with these storms. 

United States of America: Isolated-severe thunderstorms are possible in multiple parts of U.S. on Friday. With the most unstable CAPE (MUCAPE) values reaching as high as 6500 j/kg and pockets of moderate wind shear, these storms will be in an area with enough instability to create supercells, as well as large hail, isolated heavy downpours, and damaging wind gusts are likely with these discrete and/or semi-discrete thunderstorms.  There is a slight tornado potential with the relatively unstable atmosphere.

                                                      

These storms likely will remain mostly as isolated-severe on Friday due to pockets of low - moderate levels of CIN. This is because these pockets of low - moderate levels of CIN, could potentially slow the speed of the MUCAPE, and instability altogether, which would reduce the possibility of experiencing prolonged severe storms, if any at all depending on the how limiting the low - moderate levels of CIN will be on Friday.

Non-severe thunderstorms are also expected Friday throughout multiple areas of the U.S. Small hail, wind gusts up to 90 km/h, and isolated flooding may occur with these storms. 

To learn more about the terms used in the thunderstorm outlook, visit our glossary. 

 

Get Inside

Move to a sturdy building or car. Remember when thunder roars go indoors! Get out of the weather.

When Outside

Do Not take shelter under isolated trees. Get out of boats and away from water. 

Remember

Unplug appliances. Avoid using the telephone or any electrical appliances. Do not take a bath or shower.

Don't Forget

Lightning can strike any location more than once. In fact, given enough time, it is actually inevitable.

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