名詞 forecast:

1. a prediction about how something (as the weather) will develop
   同義詞：prognosis

動詞 forecast:

1. predict in advance
   同義詞：calculate
2. judge to be probable
   同義詞：calculate, estimate, reckon, count on, figure
3. indicate by signs
   同義詞：bode, portend, auspicate, prognosticate, omen, presage, betoken, foreshadow, augur, foretell, prefigure, predict

1. Are you at all worried about the forecast?
   對這項預報你不擔點兒心嗎?
2. He was left with egg all over his face when his forecast was proved wrong.
   他的預言證實是錯的，他顯得很尷尬。
3. Despite the good weather forecast, the next morning was as wet as ever.
   盡管預報稱天氣很好，但次日上午仍陰雨綿綿。
4. It's said by forecast that the humidity in the air today is 60%.
   據預報說今天的空氣濕度是百分之六十。
5. Share prices plunged as a result of the gloomy economic forecast.
   該項預測展望經濟前景暗淡，因而股票價格大跌。
6. The weather forecast says it will be sunny tomorrow.
   天氣預報說明天是晴天。
7. They tried to forecast the result of the football match.
   他們試圖預測這場足球比賽的結果。
8. According to the weather forecast it will rain tomorrow.
   天氣預報說明天有雨。

fore.cast

v.（動詞）
fore.cast 或 fore.cast.ed fore.cast.ing,fore.casts
v.tr.（及物動詞）
To estimate or calculate in advance, especially to predict (weather conditions) by analysis of meteorological data.See Synonyms at predict
預測, 預報：提前預料或估計，尤其指通過對氣象數據的分析來預測（天氣狀況）參見 predict
To serve as an advance indication of; foreshadow:
預示：作為提前的預兆；預示：
例句：
price increases that forecast inflation.
物價上漲預示著通貨膨脹

v.intr.（不及物動詞）
To calculate or estimate something in advance; predict the future.
預測：提前估算或預測某事；預測未來
n.（名詞）
A prediction, as of coming events or conditions.
預言：如對于將要發(fā)生的事件或狀況的預測

來源：
Middle English forecasten [to plan beforehand]
中古英語 forecasten [事先安排]
fore- [fore-]
fore- [在…之前]
casten [to throw, calculate, prepare] * see cast
casten [預言，估算，準備] *參見 cast

【引伸】
forecast.able
adj.（形容詞）
fore.cast.er
n.（名詞）