The phrase "as forewarning" is correct and usable in written English.
It can be used to indicate that something is being said or done in advance to alert someone about a potential issue or event.
Example: "As forewarning, I must inform you that the deadline for submissions has been moved up by a week."
Alternatives: "as a warning" or "as a heads-up".
Such steps might include the use of appropriate supportive care medication as well as forewarning the patient and initiating a more intensive early monitoring scheme and action plan for early intervention.
This gives you leeway to purchase fabric that you like, or that's within budget, etc., as well as forewarning you that you will may have a bad experience if you try to use fabric not suited for the pattern in question!
As forewarned, some students were sent home today for this reason.
Our response to Syria's gassing its own people should have been an instantaneous strike, as forewarned.
This the world has seen unfold nightly on the news as civil war engulfs Iraq, exactly as forewarned by all the war's opponents.
Also, it is important that none of the 5V pins are connected directly to the 3V chip, as forewarned on the PJRC website, which requires bi-directional level shifting.
As forewarned by the prosecuting U.S. Attorney, Ken Fimberg (later Ken Scott), the Department of Justice's stated findings and plea agreement with Rockwell were heavily contested by its own, 23-member special grand jury.
As forewarned by Seaman et al. [ 2], our 12-week follow-up period avoids major confounding by periodic changes in ex-prisoners' drug use.
He e-mails her and remembers what she had on in a tone that reads as a forewarning for something worse.
Maybe we should have taken the climax of the opening ceremony as a forewarning: though no fault of its own, the 1980 United States hockey team will always represent a mixing of sport with political attitudes and agendas.
The ITV Digital collapse has had an effect on the Premiership in that it serves as a forewarning of what is to come when the current Sky TV deal is over and we renegotiate.
