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My family and I are moving to Logan in about 3 weeks. We are moving from Henderson, NV. I was wondering how often tornados occur? Do thunderstorms happen frequently? Thank you for taking my comment and questions, I hope to hear back from you! Susan M.
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Tornadoes in Utah are rare, and I don't know of any that have occurred in the Cache Valley (Logan) in the past few decades. It is generally too mountainous for tornadoes to form. There are occasional waterspouts over the Great Salt Lake or Utah Lake (Provo) but they happen once every 2-3 years. Some tornadoes also develop over the central Utah flat areas, but again they happen once every 4-5 years.
Thunderstorms are a late spring and summer occurrence in Utah, especially along the Wasatch Front from Logan to south of Provo. Thunderstorms pop up in southern Utah in the late summer and early autumn times too. It is hard to give an exact number of thunderstorms because each year is different. Here is a link to the National Weather Service office in Salt Lake City: http://www.wrh.noaa.gov/slc/
Scroll down to Climate, then Local; on the next page click on NOWData and you can find some data for Logan as far as temperatures and precipitation are concerned.
I hope this helps. Welcome to Utah. Logan will be significantly cooler than Henderson, but I think the view more than compensates for it.
Keith Merrill KSL Meteorologist