World Weather/Climate Extremes Website

Tornado: Widest Tornado (maximum diameter)

Record Value Nearly 4000m (2.5mi) in width
Date of Event 22/5/2004
Length of Record 1950-present
Geospatial Location Hallam, Nebraska [40°34'N, 96°47'W, elevation: 451m (1480ft)]

Reference

http://www.crh.noaa.gov/oax/archive/hallam/hallam.php

Discussion

Peak width of nearly two and a half miles was surveyed by National Weather Service Forecast Office, Omaha/Valley, Nebraska

Additional Images

Hallam Nebraska's Wide Tornado region
GOES12 Satellite image, 23/5/2003
Hallam Tornado's track

Track of Hallam's tornado

Regional satellite overhead view of Hallam, Nebraska region

Regional satellite overhead view of Hallam, Nebraska region