It added that winds could carry the ash southwest toward Bali's global airport and Java, Indonesia's most densely populated island.
Most travel insurance policies for Bali have excluded any volcano-related incidents since it began erupting previous year, as it is considered a known risk.
The global airport on the Indonesian resort island of Bali reopened Friday afternoon after a almost 12-hour closure due to a volcanic ash threat that disrupted travel plans for thousands.
A number of flights between Australia and Bali have been cancelled or turned back due to ash from the eruption of the island's Mount Agung.
"Based on the meteorology agency prediction, the volcanic ash will reach the airport on Friday morning", airport spokesman Yanus Suprayogi said in a statement, adding that a possible extension of the airport closure after 7pm would be reviewed.
The volcano's alert level remains moderate.
The major reason for cancelling the flights during a volcanic eruption is that it can damage engines, clog fuel and can even hamper visibility.
Virgin Australia, Qantas and Jet Star were monitoring the situation in consultation with Australia's Bureau of Meteorology's Volcanic Ash Advisory Centre, which was due to meet on Friday morning to assess when flights might resume.
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Australian airlines had canceled flights scheduled for Thursday evening while the airport was still operating.
In a later tweet, the airport advised people to "stay updated for every information from our official account".
Volcanic activity had only subsided by February 2018, and the Bali Tourism office announced that the volcano alert had been downgraded to a Level III.
The queue at Bali's worldwide airport.
The report further suggests that the sudden increase in the lava eruption has forced millions of people to evacuate the nearby regions of the volcanoes.
Bali's main worldwide gateway will be closed until at least Friday evening, according to officials, who added that two other domestic airports were also shut.
The agent said it was important customers did not assume that all flights would be cancelled. Government seismologists monitor more than 120 active volcanoes.