Wind gusts and low humidity are helping to fuel wildfires burning across the Northeast, with cities in the region on high alert Saturday.

Red flag warnings — which indicate an increased risk of fire danger due to warm temperatures, very low humidity, and stronger winds — had been in effect for some Northeastern cities through Saturday afternoon.

A number of cities in Connecticut, Massachusetts and Rhode Island will be under a red flag warning between 9 a.m. and 6 p.m. Sunday, according…