"be observant of" is a correct and usable phrase in written English.
It implies that someone should pay close attention to a situation or event. Example sentence: "Be observant of your surroundings while walking home late at night."
He warns the public to be observant of rising water and notes that it could be far deeper than it seems or the current far stronger.
One must assume that Kelly, now in his sixth year with the team, has cautioned those around him to be observant of any and all banana peels on South Bend sidewalks.
De La Rosa would later tell a Santa Ana police department's terrorism liaison officer that she grew suspicious when Razak "appeared to be observant of his surroundings and was constantly surveying all areas of the facility".
The key findings that emerged were: the sample reported a higher level of exposure to fixed cameras (even though there are more operational mobile cameras), younger males were most likely to speed and be observant of speed cameras and that perceived certainty of apprehension was the largest reported deterrent force.
Westerners should also be observant of holy fasting days during which they should not eat, drink or smoke in public.
Be observant of the expectations around deadlines.
He was observant of their ways, and appreciated stories of their intelligence.
That, by traditional Jewish law, makes one Jewish regardless of whether someone is observant of the religion, or oblivious.
He's observant of tears and laughter alike, but he might have made fewer sacrifices in the name of a tidy package.
"We felt that the community out there who is observant of dietary laws should not be deprived of Nathan's products," Mr. Paley said.
