On Monday at 11 am, the Lake County Sheriff’s office will conduct a full-length test of warning sirens in Middletown, Anderson Springs, Cobb, Loch Lomond, and Kelseyville Riviera (formerly known as the Clear Lake Riviera). The test will last about 3 minutes. Message reminders will be sent out just before the test through LakeCoAlerts and Nixle. Testing of the sirens is held on the first Monday of the month.