This really isn’t a problem! We have some homeowners or renters who panic if they leave a hose in a pool too long, or want to drain the pool down before a heavy rainstorm. The pool may overflow, but no more so than if a patio or grass area was there instead. Appropriate drainage has most always been provided for in the pool design. Keeping the water in the pool provides the important weight to hold the pool in the ground. An empty pool is subject to “floating” or “popping” out of the ground due to “lift” (Hydrostatic) pressure from excessive ground water caused by the heavy rains that may accompany the storm.
Loose objects such as chairs, tables, toys and pool tools which can become dangerous projectiles in high winds should be stored inside of buildings. It’s not advisable to throw patio furniture into the pool. These items in the pool to cause damage to the interior finish and need to be removed as soon as possible to avoid staining. NEVER throw a glass table into the pool- yes we’ve had that too!