Weather Severity Over Time

Question: Is weather getting more severe each year?

According to the NOAA's Weather Service Storm Prediction Center, Severe Weather Events are Tornado, Hail & Wind storms.

The breakdown by sub-category (Tornado, Hail & Wind) is as follows:

The number of tornados over the last 23 years looks like this:

 

The number of hail storms over the last 23 years looks like this:

The number of severe wind storms over the last 23 years looks like this:

One problem with trying to ascertain trends from this data is that NOAA claims that advances and automation in reporting infrastructure over time have resulted in fewer and fewer low-profile weather events like wind & hail going unreported over time, and these events, but their sheer number, tend to dominate the overall data. The other problem is that this data is just counting the number of events, not their destruction or severity.

NOAA's data for the United States for the totals of Severe Weather Events over the last 23 years looks like this:

 

It should be noted that Hurricanes are not included in this data. The number of hurricanes is so small compared to these numbers, adding them would not be discernable on these plots.

Additional Info:

 

NOAA National Severe Storms Laboratory
NOAA Severe Thunderstorm Climatology
NOAA Severe Weather Potpourri

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