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Old 08-03-2011, 05:49 PM
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Derecho Derecho is offline
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Default Re: All Ontario Confirmed & Probable Tornadoes

Quote:
Originally Posted by Smokin Joe View Post
maybe i was reading this wrong but I thought the totals were inflated in the states from reading this from tornado faq's from NOAA:

"What are county-segments in NCDC tornado data? A county-segment is that portion of a tornado's path within a single county. If a tornado stays in one county, then a "tornado" is the same as a "segment." But this also means that tornadoes are counted twice when they cross into another county, three times when they enter a third county, and so forth. The reason for county-segment tornado recordkeeping is that the National Weather Service historically has verified tornado warnings by county. So when you look at NCDC tornado databases or the NWS Natural Hazard Statistics (based on Storm Data), you are not counting tornadoes, but instead county-segments of tornado tracks. This causes inflation of the tornado totals often reported by media and others who do not notice this important distinction." "
Oh that's for NCDC archives. They have drop down menus to select county data so if a tornado moved through three counties it appears three times, but includes a special note about being the same tornado that some must ignore.

NWS/SPC averages of 1300-1600 tornadoes a year are still correct and NWS confirmations are still correct. Just the NCDC does it differently.
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