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GLOSSARY


Our comprehensive glossary is available to assist in your understanding of the S'COOL lesson plan vocabulary words. Please select the first letter of the word you wish to check for a definition and further information.


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All definitions


Weather word translations
L
latitude:
a measure which identifies the north - south location of a point on the Earth. It is the angle between the line connecting a point on the Earth and the Earth'center, and the equatorial plane of the Earth. There are three ways to express latitude. You may be most familiar with 0-90 North and 0-90 South. In the computer era this became -90 to +90, where -45 equivalent to 45 South. The third method is less familiar and is called the colatitude. Colatitude is 0 at the north pole, 90 at the equator, and 180 at the south pole. So, 45 South is equivalent to a colatitude of 135..   diagram showing latitude
L
Lifting Condensation Level:
The level in the atmosphere at which a parcel of moist air that rises as it is warmed will reach 100% relative humidity and cloud droplets will begin to form.  
L
lightning:
a giant electric spark created during a thunderstorm.   Double lightning
L
line graph:
a particular type of graph that uses lines to show a trend in a data set.   Image of Line Graph
Image courtesy NASA S\'COOL Project
L
Local Daylight Saving Time:
The local standard time, plus an hour. This change is made in some parts of the world during summer months so as to cause the day's activities to begin earlier, with the goal of providing more time for leisure and recreation..  
L
Local Solar Time:
The local time where you are using the sun as a reference. Noon would be when the Sun is at its highest point. A sundial would help you measure this..  
L
Local Standard Time:
The time established for a region by law, or general use - it's the time you see on a correctly set clock, if you're not in daylight savings time (summer).  
L
longitude:
a measure which identifies the east - west location of a point on the Earth. It is the angular distance along a line of latitude from the Greenwich Meridian - a reference longitude set to be zero degrees. There are three equivalent ways to express longitude, and scientists tend to use them interchangeably. You may be most familiar with longitude as 0-180 East, and 0-180 West. It can also be expressed as 0-360 East, or just 0-360. In that case, 270 East is equivalent to 90 West. The third system arose in the computer era, when carrying both a number (0-180) and a character (East or West) was inconvenient. The new convention of -180 to +180 was then developed. In this case,-90 is equivalent to 90 West.   diagram showing longitude
L
low clouds:
Cloud types that have a maximum approximate height of 2 Km. These include cumulus, nimbostratus, fog, stratocumulus as well as cumulonimbus clouds.   Cloud Types at Low, Mid and High Levels
L
low pressure:
a pressure reading in millibars that is less than the standard sea level reading of 1013.25 mb.  
L
low pressure area:
a particular region in which the average atmospheric pressure is lower than the standard sea level pressure of 1013.25 mb.