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Lowest-Observed-Adverse-Effect Level (LOAEL): The lowest tested dose of a substance that has been reported to cause harmful (adverse) health effects in people or animals.

Melting Level: The altitude at which ice crystals and snow flakes melt as they descend through the atmosphere.

Mean Water Level Line (MWLL): The line on a chart or map which represents the intersection of the land with the water surface at the elevation of mean water level.

Mezzanine Level: The period in a company's development just before it goes public.

Minimal Risk Level (MRL): An ATSDR estimate of daily human exposure to a hazardous substance at or below which that substance is unlikely to pose a measurable risk of harmful (adverse), noncancerous effects. MRLs are . . . View Full Definition

National Water Level Observation Network (NWLON): The network of tide and water level stations operated by the National Ocean Service along the marine and Great Lakes coasts and islands of the United States. The NWLON is composed of the pri . . . View Full Definition

Mean Water Level (MWL): A datum. The mean surface elevation as determined by averaging the heights of the water at equal intervals of time, usually hourly. Mean water level is used in areas of little or no range in tide.

Next Generation Water Level Measurement System (NGWLMS): A fully integrated system encompassing new technology sensors and recording equipment, multiple data transmission options, and an integrated data processing, analysis, and dissemination subsystem.

Mean Sea Level (MSL): A tidal datum. The arithmetic mean of hourly heights observed over the National Tidal Datum Epoch. Shorter series are specified in the name; e.g., monthly mean sea level and yearly mean sea level.

Low Level Jet (LLJ): Strong winds that are concentrated in relatively narrow bands in the lower part of the atmosphere. It is often amplified at night. The southerly wind over the US Plains states during spring . . . View Full Definition