904 AM PDT Sun Sep 10 2017 San Miguel and Santa Rosa Islands-Santa Cruz and Anacapa Islands- 904 AM PDT Sun Sep 10 2017 .NOW... A cluster of thunderstorms will affect the Channel Islands through 10 AM this morning. Mainly Santa Rosa and Santa Cruz Islands. Main threat will be brief heavy rain, occasional lightning, and locally gusty winds. Local flooding possible in low lying areas including arroyos, dry stream beds.