Cooling Tower Handbook - 'link'

Here it is, the line you should memorize and stencil onto the tower control panel:

From the Cooling Tower Handbook, 4th Edition cooling tower handbook

Ice formation begins not at the bottom basin, but at the air inlets—specifically on the louvers and fill. As falling water droplets drift into the sub-freezing air stream, they flash into ice crystals that adhere to the leading edges of the fill. This is called accretion . If left unchecked, an ice bridge will form across the air intake, strangling airflow, collapsing the fill, and ultimately toppling the fan deck. Here it is, the line you should memorize

When ice forms, panic leads to silence. Silence leads to stagnation. Stagnation leads to a tower that looks less like a heat exchanger and more like a frozen waterfall. A frozen cooling tower cannot be thawed with steam hoses; it must be rebuilt in April. If left unchecked, an ice bridge will form

As ambient temperature drops, the cooling tower’s capacity for heat rejection actually skyrockets. A tower designed to cool 100°F water down to 85°F on a 95°F summer day can easily overcool that same water to 40°F or lower on a 20°F winter night. While this sounds like a performance gain, it leads to the "Ice Paradox": The better the tower performs thermally, the faster it self-destructs structurally.