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en.wikipedia.org/wiki/Supercell

A supercell is a thunderstorm characterized by the presence of a mesocyclone: a deep, ... To the extent that records are available, supercells are most frequent in the Great .... LP supercells rarely spawn tornadoes and those that form tend to be weak, ... of a hook echo, when in fact they are producing a tornado at the time.

en.wikipedia.org/wiki/Thunderstorm

A thunderstorm, also known as an electrical storm, lightning storm, or thundershower, is a storm ... Thunderstorms can form and develop in any geographic location but most .... This is the most common type of thunderstorm development. ..... of general readiness (as a thunderstorm can occur at any time of the day or year).

www.nssl.noaa.gov/education/svrwx101/tornadoes

Because wind is invisible, it is hard to see a tornado unless it forms a ... Tornadoes can also happen at any time of day or night, but most tornadoes occur between ... severe non-tornadic winds, unusually frequent lightning, and flash floods.

www.nssl.noaa.gov/education/svrwx101/tornadoes/faq

In the U.S. they are most common in the central plains of North America, east of the ... in every state in the United States, on any day of the year, and at any hour. ... Although the process by which tornadoes form is not completely understood, ... Detailed statistics about the time a tornado is on the ground are not available.

www.weather.gov/media/bis/TStorms_Tor_Lightning.pdf

Waterspouts are tornadoes that form over warm water. Water spouts can move ... Tornadoes can occur at any time of day, any day of the year. □ Have a plan of .... Lightning fatalities are most common during summer afternoons and evenings.

www.physicalgeography.net/fundamentals/7t.html

The most common type of thunderstorm is the air mass storm. ... At the same time, the ground surface in the mid-latitudes is receiving elevated levels of insolation which .... Tornadoes also have particular times of the day in which they form.

www.wunderground.com/resources/education/tornadoFAQ.asp

View More Tornado Photos. Global Tornado Map. Global Tornadoes. Frequently Asked Question. Where do tornadoes most often occur in the United States? ... However, tornadoes have occurred in every month and at all times of the day or ... Tornadoes form under a certain set of weather conditions in which three very ...

atoc.colorado.edu/~saraht/atoc1050/Class_News/Chapter19ppt.pdf

What kinds of storms do tornadoes form in? Supercells (most common), squall lines, near end of bow echoes .... What time of day do they occur most often?

www.mcc.co.mercer.pa.us/dps/SevereWeather.htm

Severe thunderstorms and tornadoes occur most often in the spring months of ... But tornadoes have occurred in every hour of the day and night, so no time of day is ... When these conditions come together, severe thunderstorms form and with .... can strike any time of the year, but, like tornadoes, are much more frequent in ...