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In meteorology, visibility is a measure of the distance at which an object or light can be clearly discerned. It is reported within surface weather observations and METAR code either in meters or statute miles, depending upon the country. Visibility affects all forms of traffic: roads, sailing and aviation. Meteorological visibility refers to transparency of air: in dark, meteorological visibility is still the same as in daylight for the same air.

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Wikipedia about visibility

In meteorology, visibility is a measure of the distance at which an object or light can be clearly discerned. It is reported within surface weather observations and METAR code either in meters or statute miles, depending upon the country. Visibility affects all forms of traffic: roads, sailing and aviation. Meteorological visibility refers to transparency of air: in dark, meteorological visibility is still the same as in daylight for the same air.

Definition

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a) the greatest distance at which a black object of suitable dimensions, situated near the ground, can be seen and recognized when observed against a bright background;
b) the greatest distance at which lights of 1,000 candelas can be seen and identified against an unlit background.
Note.— The two distances have different values in air of a given extinction coefficient, and the latter b) varies with the background illumination. The former a) is represented by the meteorological optical range (MOR).

Annex 3 also defines Runway Visual Range (RVR) as:

The range over which the pilot of an aircraft on the centre line of a runway can see the runway surface markings or the lights delineating the runway or identifying its centre line.

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In extremely clean air in Arctic or mountainous areas, the visibility can be up to to . However, visibility is often reduced somewhat by air pollution and high humidity. Various weather stations report this as haze (dry) or mist (moist). Fog and smoke can reduce visibility to near zero, making driving extremely dangerous. The same can happen in a sandstorm in and near desert areas, or with forest fires. Heavy rain (such as from a thunderstorm) not only causes low visibility, but the inability to brake quickly due to hydroplaning. Blizzards and ground blizzards (blowing snow) are also defined in part by low visibility.

Fog, mist, and haze

==Very low visibility== Visibility of less than are usually reported as zero. In these conditions, roads may be closed, or automatic warning lights and signs may be activated to warn drivers. These have been put in place in certain areas that are prone to repeatedly low visibility, particularly after massive pile-up accidents involving collisions of several (or even dozens) of automobiles have occurred there.

==Low visibility warnings== In addition, an advisory is often issued by a government weather agency for low visibility, such as a dense fog advisory from the U.S. National Weather Service. These generally advise motorists to avoid travel until the fog burns off or other conditions improve. Airport travel is also often delayed by low visibility, sometimes causing long waits due to instrument flight rules and wider spacing of aircraft.

Search results for Visibility

Visibility | Air & Radiation | US EPA

Visibility impairment is often caused by air pollution in the United States. ... Visibility in Parks and Wilderness Areas - Pollutants, photos, trends, and ...www.epa.gov/air/visibility/index.html

Business Intelligence Services & Solutions

kpi, key performance indicator, bi, business intelligence ... Visibility Corporation - 200 Minuteman Road, Suite 202 ... Visibility Europe Ltd. - 3rd Floor, 1 ...www.visibility.com/bi/

visibility: Definition, Synonyms from Answers.com

visibility n. , pl. -ties . The fact, state, or degree of being visible. The greatest distance under given weather conditions to which it is ... Wikipedia: visibility ...www.answers.com/topic/visibility

Search Engine Marketing

Offers natural search engine optimization, pay-per-click, paid inclusion, conversion enhancement, and more.www.primevisibility.com/

Helpful tips on building a website

Visibility.tv is an internet consultancy operated by Craig Goldwyn, a former ... By Craig Goldwyn, visibility.tv. Do and don't do. ...visibility.tv/tips/

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News about Visibility

Police hold one day crackdown on drivers

Scotland TodayPolice across Scotland are staging a one day crackdown on drivers who flout the law by speeding and not wearing their seatbelt. The campaign which involves all eight Scottish forces will see high visibility patrols out on the roads.http://www.stv.tv/news/West_Central_Scotland/Police_hold_one...

Authorities warn drivers of dust storm

East Valley Tribune A dust storm rolled through the Valley on Thursday afternoon, while Department of Public Safety officials warned that visibility was seriously impaired on many roads. http://www.eastvalleytribune.com/story/125520

DPS advises caution as dust storms move into Valley

KTAR 92.3 PhoenixIn situations of no visibility, pull off the freeway/highway, turn the lights off, take your foot off the brake and wait for the storm to pass. Do not use emergency flashers. Having your lights on when pulled over may lead other drivers to believe you're in a lane and still moving.http://news.ktar.com/?nid=6&sid=957849

Crash caused by poor visibility-report

Kenya Broadcasting CorporationThe plane crash that claimed the lives of former Cabinet Minister, the late Bomet MP Kipkalia Kones and Assistant Minister Lorna Laboso resulted from poor visibility.http://www.kbc.co.ke/story.asp?ID=52394

Dust Devils Photographed in Martian Arctic

SPACE.com via Yahoo! News Dust devils raging across the arctic plains of Mars were caught on film by NASA's Phoenix Mars Lander.http://news.yahoo.com/s/space/20080912/sc_space/dustdevilsph...

News about Visibility

King Claw! It's Eddy the crusher

Cornish GuardianIn good visibility lobsters can also catch fast moving prey such as shrimps and small fish. Eddy, who could be up to 50 years old or more, will now enjoy a well earned retirement in a special display at the aquarium in Newquay.http://www.thisiscornwall.co.uk/cornishguardian/King-Claw-s-...

Channel Tunnel fire quelled

Globe and MailTemperatures reached 1,000 Celsius while smoke reduced visibility to zero. “The fire has been brought under control. We are in a phase of cooling down residual fires around the main fire,” local official Gerard Gavory said from the port city of ... http://www.theglobeandmail.com/servlet/story/RTGAM.20080912....

Is your network performance getting you down?

Silicon.comIan Cummins, VP of EMEA for Network Instruments said these problems will continue to grow as companies implement new technologies and applications on their networks, and said without the "necessary visibility" into these applications, performance ... http://networks.silicon.com/lans/0,39024663,39180549,00.htm

SEO Reporting: Going Beyond Rankings

Search Engine WatchEnterprise-level SEO provides consistently outstanding ROI over the life of the project. One of the best ways to substantiate this is through ongoing reporting. In the past, many SEOs relied simply on providing visibility reports that detailed the ... http://searchenginewatch.com/3630833

Apple Estimates Trimmed By AmTech: Shift Toward Cheaper Macs (AAPL)

Alleyinsider.comIndustry "likely to aim for lean inventory" during slower macro conditions. Supply chain checks offer "low visibility in the December and March quarters, which we believe will likely impact build plans.http://www.alleyinsider.com/2008/9/amtech-trims-apple-estima...

Search results for Visibility

Visibility: Contact Details

Visibility formerly the Glasgow and West of Scotland Society for the Blind provides services such as information, training, emotional support and advocacy for people and their ... http://www.visibility.org.uk/contact-us/contact-details

visibility - Definitions from Dictionary.com

noun . 1. the state or fact of being visible. http://dictionary.reference.com/browse/visibility

visibility definition |Dictionary.com

vis·i·bil·i·ty / ?v?z ??b?l ? ti / Pronunciation Key - Show Spelled Pronunciation [viz-uh-bil-i-tee] Pronunciation Key - Show IPA Pronunciationhttp://dictionary.reference.com/search?q=visibility&r=67

Visibility.biz : Leading Experts on Microsoft Office Visio

Visibility.biz is an award-winning consulting group with leading experts on Microsoft® Office Visio® offering education and consulting ... http://www.visibility.biz/

Visibility Software, LLC

Visibility Software LLC was founded in 1999 as a provider of add-on products that could help “fill the gaps” in existing products available on the market.http://www.visibilitysoftware.com/?interbiznet
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Snow, Ice, Fog Limiting Visibility ...

Snow, Ice, Fog Limiting Visibility In Cajon PassDriving through the Cajon Pass on the 15 Freeway has been treacherous due to weather conditions. Melissa McCarty reports.Windows Media - Video

"Severe Visibility" Trailer

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Papermate Visibility - Retractable ...

Papermate Visibility - Retractable Ballpoint Pen Medium Fashion Assorted 5 CardA good quality pen that writes well and has a nice gripFlash - Video

Network and Application Visibility

Network and Application VisibilityPodTech's John Furrier sits down with Juniper's Sanjay Beri, Director of Product Management for the Security Products Group. For more information on Juniper Networks, please...MP3 - Video

V: Visibility

V: VisibilityMore and more each day, thanks to series like Transamerican Love Story, the trans community becomes increasingly visibile. Visibility is a powerful tool to combat the ignorance...Flash - Video

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Visibility_200K.wmv

Visibility_200K.wmvMedium (200K)msmedia: 3.3 MB w:320px - h:240px

Visibility_300K.wmv

Visibility_300K.wmvHigh (300K) Get Windows Media Player Related Press Releasesmsmedia: 5.3 MB w:320px - h:240px

visibility2.avi

visibility2.aviFrédo Durand, Rachel Orti, Stéphane Rivière and Claude Puech. Video of the 12th Annual ACM Symposium on Computational Geometry, Philadelphia, May 1996. avi version (189 MB)avi: 189.1 MB w:640px - h:480px

visibility1.avi

visibility1.avimade visibly simple. Frédo Durand and Claude Puech. Video of the 11th Annual ACM Symposium on Computational Geometry, Vancouver, June 1995. avi version (158 MB)avi: 158.4 MB w:640px - h:480px

CAVOK_2viste_PP1.avi

CAVOK_2viste_PP1.aviAttachment ANIMATION 1- Collision dynamics in optimum visibility conditions (CAVOK) representing the path of both aircraftsavi: 7.8 MB w:800px - h:640px

Answers for Visibility

tucsondude

Have you noticed that in the past few years automakers have decided to sacrifice visibility for styling?

tucsondudeI recently considered buying a 2008 Tundra but after a test drive i decided not too because I didnt feel safe driving it. The windshield angle and the huge blind spots were too much. there is no way...
Jesi

how can I reduce the visibility of pores?

Jesi
Dechman

Notice planes on base leg to intercept ILS much lower in poor visibility?

DechmanIt is probably a step-down altitude they are at before intercepting the ILS. Or they could be radar vectored at a specific altitude. ILS Glide Slope intercepts are always done from below to avoid ...
Amr

CBR600rr: How to adjust my bikes mirrors for best visibility?

AmrWhy is a CBR your first bike? surely you have ridden something smaller in order to pass your CBT or is this a question to catch people out. One of the first things you learn in a CBT is how to adjust ...
Sarah

How can I improve my merchant website's visibility?

Sarah

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