One hailstorm can put a week of calls into an afternoon, so plan two staffing modes
Your answer rate on a normal Tuesday tells you nothing about your answer rate on the morning after a storm, and the second one costs more.
Set a normal mode and a surge mode, and decide in advance who moves where. Surge mode usually means an extra person on the phone, an outbound text within minutes to anything that reaches voicemail, and a separate path for glass and screen calls so they do not eat the retail queue.
Measure the answer rate, not the call count. A missed call in a burst is not recoverable by returning it the next day, because that homeowner called four more companies while yours rang.
Text back fast when a call is missed. A short message with a name and a time you will call is enough to hold the position while the phone is still in their hand.
Storm callers asking about claims should be pointed to their own insurer. Have the sentence written down so whoever answers says the same careful thing every time.