The phrase "alarming indication" is correct and usable in written English.
It can be used when referring to a sign or signal that suggests something concerning or troubling is occurring.
Example: "The sudden increase in pollution levels is an alarming indication of environmental degradation."
Alternatives: "worrying sign" or "disturbing signal".
"This is an alarming, an alarming indication of where this is going," said Christopher Dunn, an attorney with the New York Civil Liberties Union.
At around $30, the average price of a club sandwich is an alarming indication of what you should expect to spend on a visit to Geneva.
FIFA President, Joseph S. Blatter said that the number of girls who are excluded from school is an "alarming indication that girls today are entering a future without hope and without options.
Even if we assume that the Iranians do eventually put pen to paper and sign the official documents, there have been alarming indications in recent days that would rather suggest that this won't make the slightest difference to restraining Iran's conduct on the world stage.
Although nobody knows for sure yet what the constant onslaught of noise does to the whales, whale researchers have found alarming indications of stress.
The most recent education news provides alarming indications that the "pipeline" from early childhood neglect to young adult incarceration is disappearing.
Recall that at the time, the economic data was turning sour at an alarming clip — a disturbing indication that the recovery would be slow and tortured.
That becomes all the more alarming when the initial indications suggest that Spotify is a tricky balancing act to make profitable.
RAMALLAH, West Bank — A new poll shows that an overwhelming majority of Palestinians support the attack this month on a Jewish seminary in Jerusalem that killed eight young men, most of them teenagers, an indication of the alarming level of Israeli-Palestinian tension in recent weeks.
Every indication is that this alarming trend continues.
Although indications are that this alarming rate is dropping, it is still avoidably high.
