The phrase "a warning at the" is not complete and lacks context, but it is grammatically correct and can be used in written English.
You can use it when referring to a specific location or point in time where a warning is issued or displayed.
Example: "There was a warning at the entrance of the park indicating the presence of wild animals."
Alternatives: "a notice at the" or "an alert at the".
Is there a warning at the box office, in the program, in the theater before you enter?
There should be a warning at the start; dozens of animals were killed during the making of this programme.
But in a warning at the same time, Mr. Almunia said his decision to approve that acquisition would not exonerate any wrongdoing by Motorola in the past.
In keeping with much of the art inside, a warning at the museum entrance reminds visitors that carrying firearms inside is illegal — another sign that you're in Texas.
Trigger warnings Sometimes called "content notes", a warning at the top of an article or front of a book that lets people know of distressing content such as rape, violence or racism.
The figures follow a warning at the weekend from the Bank of England governor, Mark Carney, that the booming housing market posed the biggest risk to Britain's economic recovery as a shortage of new homes drives up prices.
The convention now prints a warning at each seat on the dais: "Please be aware that many members of your audience may be under 18".
A room in the exhibition entered through a glass door comes with a warning at its entrance that the material there is disturbing.
In a warning at 02 17 (07:17 GMT), the NWS tweeted that an "intense snow band" was moving through the area, "expect rapid accumulations and near-whiteout conditions".
It is a warning directed at the West, at dissidents like Liu Xiabo, and at the 23 party veterans.
Mulberry published a profit warning at the end of January, blaming a retail price war for handbags and a big cancelled wholesale order from Korea, a country that was not mentioned in its first-half results the month before.
