Therefore, light intensity is measured in terms of lumens per square foot (footcandles) or lumens per square meter (lux). It is measured in footcandles or lux – it is the amount of light (lumens) falling on a surface (over any given square foot or square meter). Illuminance is the metric that is used to measure the light intensity within a space. What is the Best Metric to Measure Light Intensity?
#Lightning on a clear day how to#
This article will cover a few basic principles related to light intensity – how to measure light intensity, the difference is between lumens and illuminance (and what they mean), plus we will discuss the ways in which artificial light has become so critical to our daily lives and well-being. Shop for Architectural Lighting Solutions by BIOS It is especially useful to understand light intensity in order to properly evaluate whether or not a space has adequate lighting conditions. The lighting industry has well-established light level recommendations for a wide range of applications and space types. During the watch, people should review severe thunderstorm and lightning safety rules and be prepared to move a place of safety if threatening weather approaches.In architectural lighting, light intensity or light output is measured to understand whether a particular light source provides enough light for an intended application. These watches are issued with information concerning the watch area and the length of time they are in effect. Severe Thunderstorm Watch - Issued by the Storm Prediction Center to alert the public that conditions are favorable for the development of severe thunderstorms in and close to the watch area.
Short Term Forecast - Issued by the National Weather Service as a 1-2 hour forecast of local weather conditions emphasizing hazardous weather. Tallahassee, Tampa, Melbourne, and Miami. Graphical Hazardous Weather Outlooks can be found from the following National Weather Service Offices:
Graphical Hazardous Weather Outlook - A graphic issued by some National Weather Service Offices that shows the potential for lightning and other weather threats on the current day. This is issued to advise storm spotters and emergency managers of potentially hazardous weather and other threatening conditions. Hazardous Weather Outlook - A statement produced by the local National Weather Service offices to provide information regarding the potential of significant weather expected during the next week. In addition to the severe risk areas, general thunderstorms (non-severe) are outlined in green on the map. The HIGH risk category is only used a few times each year. The HIGH risk implies that a major severe weather outbreak is expected, with large coverage of severe weather and the likelihood of extreme severe (i.e., violent tornadoes or very damaging wind events). A MDT risk is usually reserved for days with an enhanced chance for a significant severe storm outbreak. A MDT (moderate) risk implies a greater concentration of severe thunderstorms, and in most situations, greater magnitude of severe weather and greater forecaster confidence compared to a SLGT risk. A SLGT (slight) risk implies that well-organized severe thunderstorms are expected but in relatively small numbers, or a small chance of a more significant severe event.
The outlooks show the areas where severe thunderstorms may develop and qualifies the degree of risk. Therefore, if you know that thunderstorms are in the forecast, you know that lightning is, too.Ĭonvective Outlooks: The Storm Prediction Center issues forecasts based on the potential for organized severe thunderstorms.
#Lightning on a clear day registration#
0 kommentar(er)
