Difference between Horrible and Alarming

HORRIBLE vs ALARMING: NOUN

A person wearing a comic or grotesque costume in a parade of horribles.
A thing that causes horror; a terrifying thing, particularly a prospective bad consequence asserted as likely to result from an act.

Frightening because of an awareness of danger
Causing apprehension, fear or alarm; frightening
Exciting, or calculated to excite, alarm; causing apprehension of danger. -- A*larm"ing*ly, adv.
Causing alarm or fear

Synonyms Execrable, Abominable, etc. (see nefarious); frightful, fearful, horrid, awful, revolting.
Hideous; shocking; extremely repulsive: as, horrible deformity; a horrible smell.
Exciting or tending to excite horror; dreadful; terrible: as, a horrible sight; horrible cruelty; a horrible story.

Disgusting, Appalling, Bad, Hideous, Horrific, Horrid, Awful, Dreadful, Horrendous, Terrible, Alarming, Frightful, Ugly, Horrifying, Atrocious

Ghastly, Horrific, Dreadful, Terrifying, Chilling, Grim, Scary, Horrendous, Dire, Dismaying, Unnerving, Horrifying, Ominous, Appalling, Frightening

Disgusting, Appalling, Bad, Hideous, Horrific, Horrid, Awful, Dreadful, Horrendous, Terrible, Alarming, Frightful, Ugly, Horrifying, Atrocious

Ghastly, Horrific, Dreadful, Terrifying, Chilling, Grim, Scary, Horrendous, Dire, Dismaying, Unnerving, Horrifying, Ominous, Appalling, Frightening

This is a horrible company with horrible people and the owner Brian Tillman could care less about you if and when things go bad.
Victim is a child, the name of the most horrible products are often the horrible.
Locksmith will be the last resort but this is definitely a Horrible Promblem to have at a Horrible Timming.
You guys get two stars because of the horrible horrible employees you have working there.
The rep I spoke with had a horrible attitude, she spoke horrible.
Overall just a horrible experience and a horrible company to do business with.
Santa, not only the most horrible of horrible bosses but a drunken letch to boot.
The whole thing with Super PACs is a horrible, horrible scam.
Shopclues is perhaps the most horrible site with horrible service.
The bottom half was horrible, utterly, hopelessly, unforgivably horrible.

But for me, it is an alarming indicator.
Losing your child is actually a alarming prospect.
Online porn is growing at an alarming amount.
Google search also would have yielded alarming results.
Corso says conversion cases are the most alarming.
Budget data revealed an alarming state of affairs.
Other reports followed, still more emphatic and alarming.
This was very surprising and alarming to us.
It was alarming to suppose that that thing was perhaps dead; and still more alarming to think that it was perhaps alive.
Alarming as thmore alarming still are the transboundry economical dependencies they create.