最佳解答: The forecast was for clear skies this morning乃為The forecast was called for clear skies this morning之省略=The forecast was predicted clear skies this morningcall for在此意思=predict(American English: to say that a particular kind of weather is likely to happen))預測
2012-08-03 11:04:22 補充：
2012-08-03 14:27:47 補充：
CALL FOR(AmE)to say that a particular kind of weather is likely to happen =predict
LONGMAN DICTIONARY OF CONTEMPORARY ENGLISH 2003 P209
2012-08-03 14:42:00 補充：
When we say "the forecast is/was for clear skies/rain/etc.," it means: "the forecast is predicting ..." [whatever type of weather it happens to be].
be動詞的前後如果都是名詞時，表示這兩個名詞是相同的東西。但forecast =/= clear skies，要加上介系詞，讓後面的名詞成為介系詞片語，才能在語意上符合邏輯。for與against常用來表示讚同及反對的主張：I am against all forms of censorship.(反對）；Everyone says they are for equal opportuniteis.；The weather forecast is for a dry sunny day tomorrow.
The forcast was for clear skies this morning. = 氣象報告原來的主張是今天天晴的（但後來突然更改了）。
Clear/cloudy skies are used to talking about the weather.
Tomorrow we expected clear skies in the morning, with rain in the afternoon.
to call for something = to make something necessary or suitable
The present crisis calls for mature judgment on the part of our leaders.
Skill and initiative are called for in this job.
2012-08-03 12:11:05 補充：
1. To appear, as on someone else's premises, in order to get: My chauffeur will call for you at seven.
2. To be an appropriate occasion for: This news calls for champagne.
3. To require; demand: work that calls for patience.