Hudson Bay Low: An area of low pressure over or near the Hudson Bay area of Canada that often introduces cold air to the north central and northeast United States.

 

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Hudson Bay Low: An area of low pressure over or near the Hudson Bay area of Canada that often introduces cold air to the north central and northeast United States.

Mainstream Flow: The flow in a part of the fluid (e.g., in a tidal creek) that is well above the bottom or well away from a surface and essentially not under the influence of the boundary layer (see boundary layer).

Lowsiding: Lowsiding occurs when a motorcycle falls over and drops the rider to the ground. Some riders have been known to deliberately drop their bikes to avoid an accident. This is usually a bad idea . . . View Full Definition

Make Allowance (Or Milk Manufacturing Marketing Adjustment): The margin between the government support price for milk and the CCC’s purchase price for butter, nonfat dry milk, and cheese. This margin is administratively set to cover the costs of 'maki . . . View Full Definition

Marshmallow: A soft hitting ball; ineffective ball.

Mean Low Water (MLW): A tidal datum. The average of all the low water heights observed over the National Tidal Datum Epoch. For stations with shorter series, comparison of simultaneous observations with a control . . . View Full Definition

Marshmallow root (Althea officinalis): The root soothes mucous membranes, helps heal wounds, ointments and cremes made from the root are effective on chapped hands and lips, internally treats inflammation and problems of the geni . . . View Full Definition

Lowland: A relatively flat area in the lower levels of regional elevation.

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.

Lowest Astronomical Tide: As defined by the International Hydrographic Organization, the lowest tide level that can be predicted to occur under average meteorological conditions and under any combination of astronomi . . . View Full Definition