'forewarn' is correct and can be used in written English.
You can use it to refer to the act of warning someone about a potential problem or danger before it happens. For example, "The manager forewarned the team about the difficult conditions of the project before they began working on it."
Though laser technology is deployed alongside its runways to monitor changes in wind speed and thus forewarn pilots, that is often not enough.
The trouble that Mr Greenspan took to forewarn of reversing just one of those three rate cuts may still point to worries about the amount of borrowing in the system.
A few months earlier, an expert group on rural indebtedness had provided a long list of worthy proposals, such as organising farmers into self-help groups, and employing satellites to forewarn farmers of unkind weather.But the government decided that a far quicker and easier way to help them was to let them off their debts.
That, at least, is the conclusion of a sobering study just published in PLOS ONE, by Martha McClintock and Jayant Pinto of the University of Chicago.Dr McClintock and Dr Pinto were prompted to conduct their investigation because they knew olfactory problems can forewarn of neurodegenerative diseases such as Alzheimer's and Parkinson's.
Now he stands accused of disrespecting Congress as a partner in the war in Iraq by failing to take the opportunity of a closed session with its members last week to forewarn them of accusations of torture and abuse (this is not mere amour propre: Congress formally declares war in America).
The new law is another attempt to forestall violence.Besides requiring masked protesters to identify themselves to the police when asked, the law would stiffen penalties for vandalism and require organisers of demonstrations to forewarn authorities about protests.
Then, with no forewarning, the murk simply fell away.
From The Twilight of the Gods, in the scene where Ford imagines himself cuckolded by Falstaff; from Siegfried, in the horn calls and string curlicues before Fenton's aria in act three; and from Klingsor's music in Parsifal (as Martin Kettle, who was also in Milton Keynes, forewarned me) in the chromatic slithering that accompanies the drenched Falstaff at the start of the final act.
Not being forewarned, El Salvador were not at all forearmed.
"I was the first generation to be forewarned about the tradeoffs," she said.
I often had calls from my own risk managers forewarning me that a senior trader was about to call me to complain about a declined transaction.
