Pressure: The pressure exerted by the earth's atmosphere at any given point. (The National Weather Service Glossary)
Feels Like (i.e., RealFeel Temperature): An index developed by AccuWeather, Inc. that describes what the temperature really feels like; it is a unique composite of everything that affects how warm or cold a person feels and measures the effects of temperature, wind, humidity, sunshine intensity, cloudiness, precipitation and elevation on the human body. (http://wwwa.accuweather.com/help.asp?help=site&page=realfeel)
Relative Humidity: The ratio of the amount of water vapor actually present in the air to the greatest amount possible at the same temperature. (Merriam Webster Dictionary)
Wind Chill: A measure of the effect when increased wind speeds accelerate heat loss from exposed skin. (National Weather Service Glossary)
Wind Direction: The direction from which the wind is blowing. (The American Meteorological Society's Glossary of Meteorology, http://amsglossary.allenpress.com/glossary)
Wind Speed: The rate at which air is moving horizontally past a given point. (The National Weather Service Glossary)
Temperature: A degree of hotness or coldness measured on a definite scale. (Merriam Webster Dictionary)
Visibility: The distance at which a given standard object can be seen and identified with the unaided eye. (National Weather Service Glossary)
