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 and summer is a notable example.

 

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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

Mean Lower Low Water (MLLW): A tidal datum. The average of the lower low water height of each tidal day observed over the National Tidal Datum Epoch. For stations with shorter series, comparison of simultaneous observat . . . View Full Definition

Mean Low Water Springs (MLWS): A tidal datum. Frequently abbreviated spring low water. The arithmetic mean of the low water heights occurring at the time of spring tides observed over the National Tidal Datum Epoch. It is . . . View Full Definition

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

Mean Lower Low Water Line (MLLWL): The line on a chart or map which represents the intersection of the land with the water surface at the elevation of mean lower low water.

Mean River Level: A tidal datum. The average height of the surface of a tidal river at any point for all stages of the tide observed over the National Tidal Datum Epoch. It is usually determined from hourly h . . . 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.

Mean Tide Level (MTL): A tidal datum. The arithmetic mean of mean high water and mean low water. Same as half-tide level.

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.

Mean Sea Level: The average height of the sea surface water level. For the United States, it is computed by averaging the levels of all tide stages over a nineteen year period, determined from hourly height . . . View Full Definition