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All answers having "Forecast" as clue:

4 Character Answers:

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BODE

TOLD



5 Character Answers:

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BODED

TREND



7 Character Answers:

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OUTLOOK

PREDICT

PRESAGE

PRETELL



8 Character Answers:

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OVERLOOK

PRESAGED

PROPHECY



9 Character Answers:

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HOROSCOPE

PROGNOSIS

PROJECTED



10 Character Answers:

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PREDICTION

PROJECTION



15 Character Answers:

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PROGNOSTICATION