(Grubstreet) - Temperatures over the Labor Day weekend reached an unseasonable 110 degrees in parts of Northern California. Nice for a final beach day, you might say, but winemakers weren’t too thrilled because the oppressive heat withered their grapes into raisins still clinging hopelessly to the vine. The San Francisco Chronicle reports that the area effectively got three straight days of triple-digit heat. The awful daytime temperatures didn’t cool off enough at night, meaning around-the-clock dehydration for the fruits — and now a year that looked like “a promising and average-yielding vintage” is one where Napa vineyard owners watched as much as half their crop literally shrivel up