Storm expert discussing tornado  Updated May 21, 2013 18:40:00
The twister was on the ground for 40 minutes. The US National
Weather Service says it was both unusual and unlucky that an
urban area was struck. Jonathan Kurtz is a meteorologist with
the weather service in Norman, Oklahoma.  Source: PM | Duration:
2min 37sec  Topics: storm-disaster, cyclones, united-states
DAVID MARK: The US National Weather Service says it was both
unusual and unlucky the twister struck an urban area.  Peter
Lloyd is speaking to Jonathan Kurtz, a from the weather service
in Norman, Oklahoma.  JONATHAN KURTZ: It looks like its width
was about three city blocks wide, which given the city of Moore
is probably about quarter of a mile to a mile wide at some
points.  PETER LLOYD: Is that an unusual size of a tornado?
JONATHAN KURTZ: Not unusual for the southern plains of the
United States. What's unusual I guess - if you want to call it
unusual - is the fact that it hit an extremely heavily populated
area.  PETER LLOYD: What's th