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Upslope fog explanation

Upslope fog Upslope fog or hill fog forms when winds blow air up a slope called orographic uplift. The air cools as it rises, allowing moisture in it to condense. Evaporation fog Upslope Fog a fog that forms as moist air is force d up a hill or mountain.

What is Fog?

Upslope Precipitation Upslope fog Fog that forms when warm moist air is forced up a slope by wind. It forms when moist air flows upon windward side of hillsides or mountain slopes. It can persist for many days over an extensive area. Upslope precipitation Precipitation that forms due to moist, stable air gradually rising along an elevated plain. Upslope precipitation is common over the western Great Plains, especially east of the Rock Mountains.

Upwelling The upward circulation of cold, nutrient-rich bottom water toward the ocean surface.

upslope fog

When humid air gradually moves up slope or up a hill, air expends and cools adiabatically, and if the temperature of the air drops to the dewpoint temperaturefog is produced. UT or UTC According to U.

The most common types of fog in Taiwan are radiation and advection fog; they usually appear in winter and spring. A dense mass of small water droplets suspended in the air near the ground.

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Visibility is reduced to less than 1 kilometre. Forced convection Upslope fog. Topic: Meteorology.The scene can be as spectacular as a view from above showing only the tops of city skyscrapers poking through or as disorienting as a sheet of gray directly in front of you.

According to the Glossary of Meteorology from the American Meteorological Society, fog is a collection of water droplets suspended in the atmosphere in the vicinity of the earth's surface that affects visibility. Specifically, fog reduces visibility below 1 kilometer or 0. Often in the fall, you'll see morning fog hug lower valleys of the Appalachians. This valley fog, really just a type of radiation fog, results from cold, dense air draining down mountain slopes at night, collecting in the valley floors, then forming as any other radiation fog described above.

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As solar energy heats the ground near the fog's edge, vertical mixing brings drier air into the fog's edge, evaporating it. A typical ground fog will dissipate first at its edges, where its depth is more shallow, working its way toward the thicker center of the fog. Sometimes fog forms when warm air moves over a cold surface.

Warm air moving over snow-covered ground in winter and sea fog drawn inland over a cool land surface along the West Coast are two prime examples of so-called advection fog. Unlike radiation fog, advection fog can sometimes be seen as moving laterally along or near the ground. When surface temperatures are below freezing, water droplets in a fog are supercooled, waiting to freeze on contact with any subfreezing surface. These freezing fog events can be dangerous not only for a reduction in visibility but also for a light accumulation of ice on roads, particularly bridges and overpasses.

At even colder temperatures, fog made up solely of tiny ice crystals will form. This ice fog is common in the winter months in parts of Alaska's interior, among other locations closer to the poles.

upslope fog explanation

You may also notice steam fog from some lakes in the fall or early winter. Cold air overlaying warm air near the warm lake surface is an unstable configuration, lending itself to rising air. The mixing of cool air chills the warmer, more moist air immediately above the lake to allow condensation and a cloud to form. You can typically see wispy, vertical currents of fog rising from the lake. The Appalachians, parts of northern New England and the Pacific Northwest each typically see at least 40 days a year with dense fog at least one-quarter mile visibility or lower.

Parts of the northern Gulf Coast and California coast can also have frequent fog, if not always dense fog. In winter, valley fog can hang stubbornly in lower elevations of the Great Basin, as well as California's Central Valley, as the combination of warmer air aloft moves over an area just soaked by the storm.

What about the least foggy location in the Lower 48 States? That would be the Desert Southwest, from southern Nevada and southwest Utah into Arizona and southwest New Mexico, averaging only a few days a year of dense fog. Daily 10 Today. By Jon Erdman October 14, Mountain valley fog in eastern Kentucky.

Average days per year with dense fog defined as reducing visibility to one-quarter mile or less in the U.This Weather Guide on wind will answer all your questions.

Our meteorologists helped create this guide so you can clear up the difference between fact and myth. Use the buttons below to jump to a specific question or read the entire guide and become an expert.

Types of Fog.

upslope fog explanation

Fog Dangers. Download a PDF version of the guide you can access later. Nearby bodies of water, topography, and weather conditions are three factors that influence fog. You can think of it as a low-lying cloud. Fog most resembles stratus clouds, or low-lying, horizontally layered clouds.

It is difficult to see through because of the varying concentrations of the water droplets. You can watch Earth Networks Meteorologist, Fred Allen, explain how it forms in the video below or you can scroll down to read about it. When water vapor condenses, it turns into tiny droplets of varying concentration in the air.

Dew Point: The temperature below which water droplets start to condense and form dew or frost.

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Dew point is a surface weather observation. Fog can be a little tricky. Sometimes it forms at lower humidities. Air in this area becomes saturated by any of these three processes:. Addition of moisture. Mixing with another air parcel.

To get fog, you need a thicker layer of saturated air at the surface. You also need a light breeze to help mix the atmosphere, but not too strong or drier air higher in the atmosphere will mix out the higher moisture near the surface. This is one of the most frequently asked questions on the subject.

Now that you know a little bit about what fog is and how it forms, do you think you could answer this question? There are instances where dew points rise to the air temperature, but common morning fog is created as the atmosphere cools.

Since it forms in a number of ways, there are also various types of fog. This section includes definitions for several types of fog, including: evaporation, freezing, and radiation fog — just to name a few! This may come as a shock, but there really is no difference between fog and mist.Related to Upslope fog: Steam fogValley fogEvaporation fog. Condensed water vapor in cloudlike masses lying close to the ground and limiting visibility. An obscuring haze, as of atmospheric dust or smoke.

upslope fog explanation

A mist or film clouding a surface, as of a window, lens, or mirror. A cloud of vaporized liquid, especially a chemical spray used in fighting fires. A state of mental vagueness or bewilderment. Something that obscures or conceals; a haze: shrouded their actions in a fog of disinformation. To make vague, hazy, or confused: a memory that had been fogged by time.

To be blurred, clouded, or obscured: My glasses fogged in the warm air. A new growth of grass appearing on a field that has been mowed or grazed. All rights reserved. Physical Geography a mass of droplets of condensed water vapour suspended in the air, often greatly reducing visibility, corresponding to a cloud but at a lower level.

Physical Geography a cloud of any substance in the atmosphere reducing visibility. Photography photog a blurred or discoloured area on a developed negative, print, or transparency caused by the action of extraneous light, incorrect development, etc. Chemistry a colloid or suspension consisting of liquid particles dispersed in a gas.

Photography photog to produce fog on a negative, print, or transparency or of a negative, print, or transparency to be affected by fog. Copyright, by Random House, Inc.

A dense layer of cloud lying close to the surface of the ground or water. Farlex Trivia Dictionary. It was like wading about in dark milk soup —Erich Maria Remarque The fog was thick and strangely white.

Similes Dictionary, 1st Edition.Start your free trial today and get unlimited access to America's largest dictionary, with: More thanwords that aren't in our free dictionary Expanded definitions, etymologies, and usage notes Advanced search features Ad free!

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Test your knowledge - and maybe learn something a Login or Register. Save Word. Definition of upslope fog. Love words? Learn More about upslope fog. Dictionary Entries near upslope fog upskill upslip upslope upslope fog upsoar up someone's street upspeak See More Nearby Entries. Statistics for upslope fog Look-up Popularity. Get Word of the Day daily email!

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Take the quiz True or False? Take the quiz Play the game.Updated: Dec 31, Fog is just a cloud on the surface. Fog can cause a variety of issues for pilots including icing and IFR conditions.

Upslope fog

Fog is classified by the manner in which it forms. Here's what you need to know. Forms on clear nights with relatively little to no wind present.

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Most commonly found in low-lying areas like mountain valleys. Formation is caused when the ground cools rapidly due to terrestrial radiation and the surrounding air temperature reaches its dew point. Forms when a layer of warm, moist air moves over a cold surface. Unlike Radiation Fog, Advection Fog needs wind speeds up to 15 knots in order to form. Winds above 15 knots will lift the fog into a low stratus cloud. Most commonly found in coastal areas.

Upslope fog occurs when moist, stable air is forced up sloping land features like a mountain range. This type of fog also requires wind for formation.

Forms when cold, dry air moves over a warmer body of water. As the water evaporates, it rises and resembles smoke or steam. Most commonly found over bodies of water during the coldest seasons of the year. Occurs in cold weather when the temperature is much below freezing and water vapor forms directly into ice crystals.

Conditions favorable for its formation include outside air temperatures of F or colder. Author - Nate Hodell.Skip to main content. Toggle navigation. Introduction Foreword to the edition Meteorological definition of a meteor General classification of meteors Hydrometeors Lithometeors Photometeors Electrometeors. Introduction and principles of cloud classification Definition of a cloud Appearance of clouds Principles of cloud classification Cloud classification summary Cloud abbreviations and symbols.

Useful concepts Definitions of clouds. Introduction Orographic influence on the windward side Orographic influence on the leeward side. Nacreous clouds Nitric acid and water polar stratospheric clouds Noctilucent clouds polar mesospheric clouds.

Classification and symbols of meteors other than clouds Hydrometeors Lithometeors Photometeors Electrometeors Character and intensity of precipitation Additional symbols.

upslope fog explanation

Hydrometeors other than clouds Lithometeors Photometeors Electrometeors. Introduction Observation of hydrometeors other than clouds Observation of lithometeors Observation of photometeors Observation of electrometeors. Observation of clouds from the earth's surface Introduction Identifying clouds Total cloud cover and cloud amount Height and altitude Direction and speed of movement Optical thickness Observation of clouds from mountain stations Observation of upper atmospheric clouds.

Issues for observation of clouds from aircraft Descriptions of clouds as observed from aircraft Fog and haze as seen from aircraft. Search Image Gallery Compare two images. Editorial note Appendix 1 - Etymology of latin names of clouds Appendix 2 - Historical bibliography of cloud classification Appendix 3 - History of cloud nomenclature Appendix 4 - Lists of tables, figures and acronyms History of the ICA Foreword to the edition of volume II Preface to the edition of volume I Preface to the edition Preface to the edition.

ICA Vol. Other Meteors Classification and symbols of meteors other than clouds Definitions and descriptions of meteors other than clouds Hydrometeors other than clouds Hydrometeors consisting of a suspension of particles in the atmosphere Fog Fog compared with Mist Freezing fog Radiation fog Advection fog Evaporation fog Upslope fog Hill fog Frontal fog Ice fog Hydrometeors consisting of a fall of an ensemble of particles precipitation Hydrometeors consisting of an ensemble of particles raised by the wind Hydrometeors consisting of a deposit of particles Hydrometeors consisting of a vortex of particles Spouts Lithometeors Photometeors Electrometeors Observation of meteors other than clouds from the Earth's surface.

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