The phrase "alarming case" is correct and usable in written English.
It can be used to describe a situation or instance that causes concern or fear, often in a serious context.
Example: "The report highlighted an alarming case of environmental degradation that required immediate attention."
Alternatives: "disturbing situation" or "worrisome instance".
There is no more alarming case study of the consequences of historical ignorance than President Trump.
In a report today highlighting this profoundly alarming case, the Independent Police Complaints Commission IPCCC) has made various conduct findings.
Amnesty also warned that the arrest of the Vice journalists was another alarming case of the arbitrary use of Turkey's anti-terrorism laws.
Another alarming case was Zena Briggs, who was forced to live on a witness protection scheme after fleeing an arranged marriage in 1993.
One alarming case has been seen in the Peñalara national park near Madrid, where the climate has become more humid and the fungus has caused mass mortality among amphibians.
A paper in the Veterinary Record, published in 1975, reported an alarming case of bird death by frying pan: 'Five cockatiels died within 30 minutes following exposure to fumes from a frying pan coated with the "non-stick" plastic polytetrafluoroethylene (PTFE) that had accidentally overheated.
Parry Aftab, a lawyer and safety expert, says she is increasingly hearing about alarming cases involving online dating, like pedophiles who woo single mothers to get near their children.
"I think this is one of the more alarming cases where they were actually limiting a student's academic choices," said Dr. Jason Lanter, an assistant professor of psychology at Kutztown University and president of the Drake Group, an N.C.A.A. watchdog.
In the past year or so, researchers have identified rapid rises in meltwater and alarming cases of glacial retreat in Greenland, West Antarctica, the Canadian and Alaskan coastal mountains, in Europe and in the Himalayan massif.
Late last year, in what American officials described as one of the more alarming cases, the Kuwaiti police arrested a local man, an Afghan veteran, who said he was associated with Mr. bin Laden's group and planning to bomb American and Kuwaiti targets.
Part of the problem is the breakneck pace of technological change, which results in alarming cases of obsolescence.
