Cloud droplets combining with gaseous pollutants, such as oxides of sulfur and nitrogen, to make falling rain or snow acidic. AIR MASS: A widespread body of air with consistent temperature and moistur [..]

An area of high pressure centered over the western Atlantic Ocean.  This weather system produces a southerly wind which often moves warm, humid air into the Northeast. BIOMETEOROLOGY: The portion of t [..]

The statistical collective of weather records during a specified period of time. COLD FRONT: The front edge of a cold air mass. It often produces precipitation and, frequently, severe weather. CONDENS [..]

A principal cloud type, dense and vertically developed, which produces heavy precipitation. It features an anvil shape on top and a dark base. CUMULUS: A principal cloud type of vertical elements havi [..]

A type of weather radar which displays atmospheric motion.  It utilizes the Doppler Effect to measure the velocity of particles in the atmosphere. DOWNBURST: A strong localized downdraft of wind that [..]

Less than 4/10 opaque cloud cover, no precipitation, and no extremes in temperature, visibility or wind. FLASH FLOOD: A flood which is caused by heavy or excessive rainfall in a short period of time, [..]

(cryoseism

Below-freezing temperatures are expected during the growing season and may cause significant damage to plants and crops. FROSTBITE: The partial freezing of exposed parts of the body, causing injury to [..]

Issued when the Heat Index is expected to exceed 105 during the day and 80 during the night for at least two consecutive days. HEAT INDEX: Also known as the Apparent temperature, it is a non-physical [..]

Relatively strong winds concentrated within a narrow band in the atmosphere.