The phrase "abruptly appear" is correct and usable in written English.
It can be used to describe something that suddenly becomes visible or noticeable without warning.
Example: "The magician made the rabbit abruptly appear from the hat, leaving the audience in awe."
Alternatives: "suddenly emerge" or "unexpectedly show up".
In the final drive, as if by magic, the Giants abruptly appeared poised and capable.
That's a fair enough analogy," Stipe says, before abruptly appearing to be put out.
Finally, Dr. Tony Garcia of the medical unit abruptly appeared at the tent opening and shouted: "Get in the hole!
Local watermen said the boat had abruptly appeared one day in February, and had not been touched in weeks.
Wearing the military uniform of Iraq's élite counterterrorism force, Prime Minister Haider al-Abadi abruptly appeared on Iraqi national television in the early hours of Monday morning.
That is about one-tenth of the typical annual take of 300,000 pounds before 1985, the year the abruptly appearing algae all but wiped out scallops.
He vanished for three months and abruptly appeared on Iranian state television, confessing, apparently under duress, that he had been sent by the C.I.A. His family members, who live in Flint, Mich., were traumatized.
Last month, a group of young people abruptly appeared in the middle of downtown Beijing, carrying on their shoulders a woman wearing a mask and wrapped in white cloth.
Hiddink has made it clear he prizes the balance that Mikel John Obi brings to the team and, having been an unused substitute against Scunthorpe, the Nigerian, rather abruptly, appeared to enjoy "rested-star-against-cup-minnow" status.
Last Wednesday, the police seized eight people after 100 demonstrators abruptly appeared and linked arms in the asphalt-covered town square, almost in the shadow of Lenin's statue.
