Because of changes over time, the most accurate weather forecasts are
a. seven-days forecasts.
b. short-term forecasts.
c. long-term forecasts.
d. analog forecasts

B. short-term forecasts are the most accurate weather forecasts because:

- the weather changes over time rapidly;
- also short-time forecasts can be done using simple procedures. Long time forecasts require more sophisticated techniques. 

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