The phrase "a blast of reality" is correct and usable in written English.
It can be used to describe a sudden and impactful realization or confrontation with the truth.
Example: "After months of living in denial, the news of the layoffs hit him like a blast of reality."
Alternatives: "a wake-up call" or "a jolt of truth".
A win and a draw in his first two games in charge created a belief that his new career would be a stroll; a subsequent run of eight successive defeats has quickly introduced a sharp blast of reality.
Penguin/Viking; £12.99The sluttish, rapacious blonde who is determined to marry the narrator's elderly widowed father brings a raw blast of reality from eastern Europe to a novel that has delighted audiences young and old.
The play comes like a rare blast of reality.
Published outside the normal bounds of painfully balanced journalism, her missive gave readers an unfiltered blast of reality.
The Obama administration has just got a multi-kiloton blast of reality from North Korea's second test of a nuclear weapon.
The attacks appeared to have taken a toll on Mr. Hussein, whose somewhat disordered appearance on television shortly after the first raid left one Iraqi with the feeling that his leader had, as he put it, been exposed to a sudden, shocking blast of reality.
That blast of reality will deliver quite a shock to Britain's heavily indebted households.Some worry that Britain could go the way of Greece.
STEVEN FELD Lufkin, Tex., Aug. 19, 2012 To the Editor: While your description of the transnational costs of air-conditioning is highly cautionary, California's experience with engaging consumers to help avoid power outages offers a usefully positive counterpoint to the article's cold blast of reality.
Archigram set out to shake Britain up, to inject a blast of excitement into the drab realities of the suburbs into which most of them were born.
