Less than 24 hours after the last typhoon warning was cancelled, the Hong Kong Observatory said on Monday that it will issue the typhoon signal No 1 on Monday night as Tropical Cyclone Toraji moves closer to the city.

The HKO said in a weather advisory that it will issue the Standby Signal, No. 1 at 10:20 pm when Toraji comes within 800 kilometers of Hong Kong.

“Toraji will move towards the vicinity of the western coast of Guangdong to the Pearl River Estuary in the next couple of days,” the observatory said. “The observatory will consider issuing the Strong Wind Signal, No 3 (T3) between later tomorrow (Tuesday) and early Wednesday.”

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Hong Kong had been under T3, which meant winds with a sustained speed of 41-62 kilometers per hour were expected, from Saturday afternoon until Sunday morning due to Severe Typhoon Yinxing.

The observatory canceled all cyclone warnings on Sunday afternoon after Yinxing moved further away from the territory.     

Toraji may come relatively close to the vicinity of the Pearl River Estuary on Thursday, but it may also weaken at the same time, the observatory said.

“Whether a higher Tropical Cyclone Warning Signal will be issued depends on the distance between Toraji and the Pearl River Estuary, its intensity and the change in local wind conditions,” the observatory added.

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As of 1 pm Monday, Toraji was centered about 250 kilometers north of Manila and was forecast to move west-northwest at about 18 kilometers per hour across Luzon.

The observatory also noted that an area of low pressure near Yap in the Caroline Islands in the western Pacific has intensified into a tropical depression.

The tropical depression was centered about 290 kilometers north of Yap at 1 pm Monday and was forecast to move west-northwest at about 26 kilometers per hour in the general direction of the seas east of the Philippines.