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La Niña – a cooling of the equatorial waters in the Pacific Ocean.

Land breeze – a wind that blows from the land towards a body of water. Also known as an offshore breeze. It occurs when the land is cooler than the water.

Late – from sunset (winter), from two hours before sunset (summer).

Leeward – situated away from the wind; downwind - opposite of windward.

Left Mover – a thunderstorm which moves to the left relative to the steering winds and to other nearby thunderstorms; often the northern part of a splitting storm.

Lifting – the forcing of air in a vertical direction by an upslope in terrain or by the movement of a denser air mass.

Lifting condensation level – the level in the atmosphere where a lifted air parcel reaches its saturation point, and as a result, the water vapor within condenses into water droplets.

Lightning – any form of visible electrical discharges produced by thunderstorms.

Likely – in probability of precipitation statements, the equivalent of a 60 or 70 percent chance.

Low – an area of low pressure, usually accompanied by cyclonic and inward wind flow. Also known as a cyclone.

Low cloud – stratus, stratocumulus, cumulus and cumulonimbus.

Low-level jet – a region of relatively strong winds in the lower part of the atmosphere.