U.S. tornadoes and severe thunderstorms

Severe convective storms in the United States are a key peril for the insurance, reinsurance and catastrophe bond markets. U.S. severe thunderstorms and the resulting hazards of large hail, damaging winds and tornadoes cause billions of dollars of damage each year and heavy losses to insurers and reinsurers.

With the catastrophe bond and insurance-linked securities (ILS) market increasingly exposed to these perils it is vital to keep abreast of the development of severe convective weather which could result in tornadoes and extreme hail. This page provides resources to keep up to speed with developments during the U.S. tornado season and the trends in terms of seasonal tornado impacts.

Today’s tornado and hail outlook

From the U.S. Storm Prediction Center. Click on the images for a larger version (opens in new window).

One day tornado outlook map

One day tornado outlook map

One day wind outlook map

One day wind outlook map

One day hail outlook map

One day hail outlook map

Annual U.S. tornado trends

From the U.S. Storm Prediction Center. Click on the images for a larger version (opens in new window).

Daily tornado count and annual running trend

Daily tornado count and annual running trend

Annual trend of local storm report tornadoes

Annual trend of local storm report tornadoes

Inflation adjusted tornado total and percentile ranks

Inflation adj. tornadoes and percentile ranks

Tornado probabilities

The probability of 1+ tornadoes occurring on any single day in the U.S. Shows the patterns of tornado incidence and when the peak of the tornado season typically occurs.

Daily Probability of a Tornado Anywhere in U.S., based on 33 years of historical data

Daily Probability of a Tornado Anywhere in U.S., based on 33 years of historical data - Source: NOAA Storm Prediction Center

Average U.S. tornado activity

Map showing locations of historical tornado activity. Useful for showing the highest risk areas based on historical tornado data. From Weather Underground
U.S. tornado activity

U.S. tornado touchdowns by longitude and latitude

U.S. tornado touchdowns by longitude 1950 – 2013

U.S. tornado touchdowns by longitude 1950 – 2013 - Source: Tim Brice, NWS El Paso, Texas


U.S. tornado touchdowns by latitude 1950 – 2013

U.S. tornado touchdowns by latitude 1950 – 2013 - Source: Tim Brice, NWS El Paso, Texas

U.S. lightning strikes (last two hours)

Shows the location and age of lightning strikes, useful for spotting where severe weather is currently located – From Accuweather.com
Recent U.S. lightning strikes