Originally Posted by UK Met Office
The Met Office routinely provides input to the warning process by sending its forecasts of hurricane tracks to NHC every 12 hours. NHC (National Hurricane Centre, Miami] uses these, along with its other forecast aids, to produce a forecast for the public, emergency planners and the government.
In the case of Hurricane Katrina, Met Office forecasts predicted the location of landfall to an accuracy of 60 km, as early as three days before the hurricane struck the coast