Firefighters in California gained a foothold in the battle against a wildfire north of Los Angeles while weather officials on Tuesday issued red flag warnings across the Northeast, where two fires disrupted a popular train service between New York and Boston. The Mountain Fire in California’s Ventura County, whose explosive growth was fueled by 80-mph winds last week, has burned 32 square miles as of Tuesday. …The fire has torched over 200 homes and businesses and injured six people, according to Cal Fire, the state’s firefighting agency. …In the Northeast, weather officials issued red flag warnings from New Jersey to Massachusetts after a modest amount of weekend rainfall brought only temporary relief to the drought-stricken region. …The rain helped firefighters gain some control over the Jennings Creek Wildfire along the New Jersey-New York border, which had engulfed 3,500 acres of land and was 20% contained as of Tuesday morning.