Dry weather and gusty winds that drove the blaze over 47 square miles in the San Bernardino Mountains were replaced Friday by higher humidity, clouds and even a few sprinkles. [...] a 100-acre fire outside the city of San Bernardino was 75 percent contained a day after drone aircraft in the area temporarily grounded air tankers fighting it. Another chance of thunderstorms was forecast for the weekend but they could bring bad news for firefighters in the form of strong, erratic winds and high temperatures with little rain.