Advanced Hydrologic Prediction Service (AHOPS)
Big Sandy River







Interesting Weather Facts
TORNADO FACT
Largest and most severe: The Super Outbreak: 148 tornadoes occurred in a span of 16 hours from 3-4 April 1974. They affected 13 US states and Ontario, Canada, and included 24 F4s and 6 F5s, more F5s than have been reported in any other year, until 2011. Until 2011, more significant tornadoes occurred during that 24 hours than any other entire week on record. However, the outbreak of tornadic acticity in 2011 is again being classified as a Super Outbreak. On 27 April 2011 alone, 197 tornadoes were spawned. An unprecedented total of 748 tornadoes spawned in April 2011 alone. The hardest hit was Joplin, MO. (04-22-2011 - EF5). 344 tornadoes were spawned between 25-28 April 2011. Of the 344 tornadoes, 15 were classified as EF4 or greater including the Tuscaloosa, AL (04-27-2011 - EF4) tornado.