Answer Happy

Which of the following statements is wrong?
a.If atmospheric conditions favor hazardous weather occurring
over a particular region during a specified time period, but the
actual location and timing of the occurrence is uncertain, a
warning will be issued to inform the public.
b.The computer forecast models tend to do a better job at
predicting temperature than precipitation.
c.Medium-range (3 to 8 days) forecasts are almost entirely based
on computer-derived products, such as forecast charts and
statistical forecasts.
d.The trend forecast assumes surface weather systems tend to
move in the same direction and at approximately the same speed as
they have been moving, if there is no evidence to indicate
otherwise.