The phrase "abruptly upon" is correct and usable in written English.
It can be used to describe an action or event that occurs suddenly or unexpectedly at a specific moment or point in time.
Example: "The meeting ended abruptly upon the arrival of the unexpected guest."
Alternatives: "suddenly at" or "unexpectedly on".
Because the individualized attention provided to patients in the operating room could not be terminated abruptly upon completion of an operation, recovery rooms, intensive care units, and respiratory care units became necessities.
The typical pattern is one of e-mail exchanges that draw the cybersuitors into a flurry of correspondence, an epistolary romance featuring an enormous emotional intensity that fizzles abruptly upon the first meeting.
After driving in a Toyota four-by-four for eighoursurs through the eastern desert from the Niger border town of Gao, we came abruptly upon a series of sandstone mesas towering over the plain — a landscape reminiscent, in its stark beauty, of Utah's Monument Valley.
These trends have led to speculation that we are approaching the end of retirement or at least entering a period in which older workers will stop working gradually rather than abruptly upon reaching retirement age, which currently stands at 65 for men and 62 for women in the UK but will rise to 67 for both by 2028.
Sensor resistances decrease abruptly upon exposure to H2 and recover to initial values after purging by dry air.
"When a bot crashes the concurrent sessions end abruptly; upon restart the bot requests a new set of cookies.
Although this autobiography abruptly ends upon the publication of "The Tin Drum" in the autumn of 1959, when the young novelist and his wife went to the Frankfurt Book Fair "and danced till morning," it is hard to imagine there will be a sequel.
The first would be by frontal impact or ejection that occurs when the part of the motorcycle is abruptly stopped upon impact while the rest of it, together with the rider, continues to move.
Abruptly, we came upon row after row of trees laden with fat orange fruit.
Upon abruptly releasing the cloud from the trap, the gas is observed to expand rapidly in the transverse direction while remaining nearly stationary in the axial direction.
She succeeded Leonard Riggio, who abruptly resigned in 2006 upon learning that the institution's charismatic longtime director, Michael Govan, had taken the top job at the Los Angeles County Museum of Art.
