Luke Thomas on QuakePrediction.com is predicting (on 4th June, 2011) a large 4.5 to 6.0 earthquake is guaranteed to hit the Big Bear City to Victorville area in the next 48 hours.
EARTHQUAKE WARNING; 4.5 to 6.0 - Big Bear City, Running Springs, Barstow, Palmdale, Victorville, Highland, Hesperia. Source QuakePrediction.com