This is another type of fog which requires wind to form. As air rises near these slopes, it starts to cool, which in turn allows moisture to condense, thereby helping to form this type of fog. Upslope Fog The Weather Doctor up slope fogĪs the name implies, this is a type of fog which is typically formed up the slope of a large hill or mountain. In winter, it can take several days before this type of fog is dispersed. While other types of fog can blow in or recede over an area due to weather systems and other factors, valley fog tends to be more confined by the valley in which it is occurring. This is often due to temperature inversion, which can occur when warm air passes above valleys. However, valley fog is a very real phenomenon, and can occur when cold air begins to settle and condense in lower parts of a valley. We tend to imagine fog as being something which encroaches on the type of shorelines and misty mountainous areas which we’ve described thus far. Valley Fog The Weather Doctor valley fogĬhances are you don’t think of valleys as places which get too much fog. Heat does not tend to disperse this type of fog easily. This type of fog can linger over large bodies of water for weeks at a time, moving inland during the day, back out to sea at night, and then encroaching on the shoreline once more the next morning. In addition, stronger winds can also lift moisture from overhanging stratus clouds, adding to the fog. The more wind there is, the thicker and denser the fog can become. In addition, this type of fog requires some wind velocity to form. This type of fog is prevalent in the spring and occurs when moist warm air moves inland from offshore. While radiation fog can sit for longer periods of time in mountainous areas, advection fog is more particular to the coastal areas of Northern Europe, especially the British Isles. Advection Fog The Weather Doctor Advection fog The colder the temperature and the thicker the fog, the longer it will take to dissipate. Warm temperatures are needed to dissipate this type of fog. Radiation fog tends to cling relatively close to the ground, rarely extending more than 20 feet from the surface. Here, sunrise does not impact the temperature as immediately, meaning that it can remain colder longer and thus allow radiation fog to persist. One exception to this rule is areas located at a high elevation above sea level. It occurs most commonly in winter, when the land starts to cool overnight and moisture lingers in the air close to the ground. The idea of a cold, foggy night is a popular one in books, and it’s those kinds of weather conditions which can contribute to radiation fog. Radiation Fog The Weather Doctor radiation fog With that in mind, let’s look at some different types of fog and where and how they occur.ġ. Different causes produce different types of fogs. The same holds true anywhere there is fog. Lawrence’s mining towns in Northern England.īut while the fog in Oliver Twist, Jane Eyre, and Sons and Lovers may all “read” the same, flying through foggy conditions in the areas in which they’re set would be very different experiences. Thumb through British literature, and you’ll see fog pop up everywhere from Charles Dickens’ London to the Yorkshire Country of the Brontë Sisters to D.H. However, there’s a lot more to it than that.įor one thing, location can play a big part in how fog works and where it’s seen. For most of us, fog is simply a murky white-grey-ish cloud that hangs over an area and makes it hard to see. What you may not know, however, unless you’re a pilot, meteorologist, or citizen of an oft-foggy city like London, is just how many “types” of fog there are. Fog lowers visibility, which can make it harder to see where you’re going.
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