Warm surface water and cooler deep water can mix through a process called convection. As warm water cools, it becomes denser and sinks, displacing deeper water and causing mixing. Wind and currents can also help in mixing water layers within a lake.
This process is called lake turnover. During the spring and fall, changes in temperature cause surface water to mix with deeper water layers. This helps distribute nutrients and oxygen throughout the lake, benefiting aquatic life.
Hurricanes don't necessarily need the water to be a certain depth as long as the water in a shallow area is warm all the way to the bottom. What you're probably referring to is the necessity that, when in deeper waters, there is a significant (150 feet is a common estimate) layer of warm (80F+) water at the surface. The reason for this is that as a hurricane passes over the water, it will generate waves intense enough to mix a shallow layer of warm water with cooler waters beneath it. In this way, the hurricane will rob itself of the warm water it needs.
Generally speaking the greater the depth of the warm water, the stronger the hurricane can get. Is is because a greater depth means a greater volume of warm water to supply energy for a hurricane.
A line where temperature changes.
An Arctic air mass moving over relatively warm lake water can cause lake effect snow. As the cold air near the surface picks up moisture from the warmer lake, it becomes unstable and produces localized bands of heavy snow downwind of the lake.
This process is called lake turnover. During the spring and fall, changes in temperature cause surface water to mix with deeper water layers. This helps distribute nutrients and oxygen throughout the lake, benefiting aquatic life.
Deeper colder water can be churned up by currents in a lake. The currents can be caused by wind or upwelling (water introduced from below) the stratification of water in a lake is a very complex mater.
The cold spots is water from the deep end of the lake or pond that got mixed up to the surface by wind or a boat or something. The deeper the water naturally the colder its gonna be and the windier the day most likely the water will be cooler due to a lot of mixing going on.
Water at the surface of a lake is exposed to sunlight and is able to absorb heat, causing it to warm up. As you go deeper, there is less sunlight and less heat absorption, resulting in cooler water at the lower depths. This difference in temperature causes the warmer water to remain on top.
The vapor pressure of a warm lake is higher than that of a cold lake because higher temperatures increase the kinetic energy of water molecules, causing them to evaporate more easily and increase the pressure of water vapor above the lake's surface.
This is known as a thermocline. It is a layer where the temperature decreases rapidly with depth. The thermocline often separates the warm surface waters from the colder deeper waters in a lake or ocean.
Warm water molecules in a lake will have more kinetic energy and will tend to rise to the surface due to buoyancy. As they rise, they will displace cooler water and contribute to mixing and circulation within the lake. This can affect the distribution of temperature and nutrients, as well as impact the overall ecosystem.
Water temperatures in Newfound Lake in New Hampshire are generally in the low to mid 70's in July. After a warm spell they can spike to the upper 70's
Hurricanes don't necessarily need the water to be a certain depth as long as the water in a shallow area is warm all the way to the bottom. What you're probably referring to is the necessity that, when in deeper waters, there is a significant (150 feet is a common estimate) layer of warm (80F+) water at the surface. The reason for this is that as a hurricane passes over the water, it will generate waves intense enough to mix a shallow layer of warm water with cooler waters beneath it. In this way, the hurricane will rob itself of the warm water it needs.
Generally speaking the greater the depth of the warm water, the stronger the hurricane can get. Is is because a greater depth means a greater volume of warm water to supply energy for a hurricane.
A line where temperature changes.
thermocline