Severe thunderstorm frequency normally tops out at the start of June, or near the time when peak heating of the Sun is still attacking the last of Winter's leftover chill.
On occasion, on the rear flank of a convective system responsible for a progressive derecho, a nearly stationary band of thunderstorms may form. The split-panel illustration below shows several mesovortices along a derecho-producing squall line as viewed by Doppler radar. As the collisions and freezing continue to occur, and the charges at the top and bottom of the cloud increase, the electric field becomes more and more intense -- so intense, in fact, that the electrons at the Earth's surface are repelled deeper into the Earth by the negative charge at the lower portion of the cloud. The development of a thunderstorm's downdraft ordinarily marks the dissipation stage of that particular storm. As a result, striking shelf clouds on occasion occur in conjunction with relatively benign thunderstorms.

Whether you love them or hate them, thunderstorms are a fact of life about this time of the year in Calgary. A thunderstorm can be considered to be severe if it is accompanied by gusts of wind that blow at a speed of 58 mph or more or there are hail stones that are an inch in diameter.
A thunderstorm warning - A warning indicates that a severe thunderstorm is on its way and you should get prepared for it. Most thunderstorms last about 30 minutes and are typically about 15 miles (24 km) inĀ­ diameter. When a storm is approaching an area you'll often hear a thunderstorm warning or watch bulletin on your local radio or TV station. It indicates that a thunderstorm is in the area but it's not close enough to issue a warning.

Heat lightning refers to the lightning that you can see from a thunderstorm that is far away in the distance.
Thereafter, the instance of severe weather fades, slowly at first, then at a quickening pace, as Sun's power begins to wane and the atmosphere reaches full Summer warmth. To understand why thunderstorms occur more often during the warm months requires some understanding of thunderstorm basics.Thunderstorms thrive under certain conditions.
About 94% of the deaths and 74% of the injuries happen between the months of June and August.

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