Understanding Bay-Effect Snow: How Lake and Bay Waters Create Snowfall

What is Bay-Effect Snow?

• ❄️ Bay-effect snow is a phenomenon that occurs when cold air moves over relatively warmer bodies of water, such as lakes or bays.
• 💡 This process involves the condensation of cold air as it travels over the water's surface, leading to snowfall.

Factors Influencing Bay-Effect Snow

• 🎯 A critical factor is the fetch, which is the distance air travels over water. A longer fetch allows for more significant condensation.
• 🌡️ The temperature difference between the cold air and the warmer water is essential for lifting and condensing the air.
• 💨 Wind direction plays a crucial role; when winds align with the longest axis of a bay, like Galveston Bay, they maximize the distance cold air travels over open water, increasing the potential for snow.

Snowfall Potential in Galveston

• ⚠️ Reports of snow flurries have been observed coming off bodies of water like Lake Houston and on the east side of the city.
• 📈 With temperatures dropping rapidly and a favorable wind shift to the north, there is a potential for decent snow squalls over Galveston Island by the following morning.
• 🌊 Galveston Bay, with its significant fetch, is identified as a key area where this phenomenon could produce snow squalls.