Upwind

UPWIND The direction from which the wind is blowing. Also the windward side of an object. The opposite of the downwind or leeward side.
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UPWIND - Into the wind, or in the direction of the prevailing wind.
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Upwind, or the direction from which the wind is blowing: the opposite of leeward.
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Windward - Upwind, or the direction from which the wind is blowing; the opposite of leeward.

UPSTREAM / UPWIND- The direction from which a flow is coming from. A boat moving down a river will be moving downstream but came from upstream.

KNUCKLES - The upwind side of a thunderstorm anvil top with mamma-like protrusions along the edge that resemble the knuckles on a hand. These are not mammatus clouds.

windward - The upwind direction from a point, for example, westward in the case of a west wind.

Thunderstorm anvils may spread hundreds of miles downwind from the thunderstorm itself, and sometimes may spread upwind.

Dividing StreamlineIn the blocked flow region upwind of a mountain barrier, the streamline that separates the blocked flow region near the ground from the streamlines above which go over the barrier.

Back-building ThunderstormA thunderstorm in which new development takes place on the upwind side (usually the west or southwest side), such that the storm seems to remain stationary or propagate in a backward direction.

Set-upThe process whereby strong winds blowing down the length of a lake cause water to "pile up" at the downwind end, raising water levels there and lowering them at the upwind end of the lake.

rain shadow"A region of sharply reduced precipitation on the lee side of an orographic barrier, as compared with regions upwind of the barrier.

Air rises on a mountain's windward (upwind) side and sinks on the lee (downwind) side. This sinking motion warms the air and causes the cloud to evaporate, destroying the cloud.

[Slang], a thunderstorm anvil which spreads upwind, against the flow aloft. A back-sheared anvil often implies a very strong updraft and a high severe weather potential.
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Simply searching past records for situations similar to current conditions upwind of a city can produce a forecast based upon what usually happens in that city, but this "analogues" approach is now less common.

A thunderstorm in which new development takes place on the upwind side (usually the west or northwest side), such that the storm seems to remain stationary or propagate in a backward direction.

In the blocked flow region upwind of a mountain barrier, the streamline that separates the blocked flow region near the ground from the streamlines above which go over the barrier.
Dividing Streamline Height ...

Back-sheared Anvil - [Slang], a thunderstorm anvil which spreads upwind, against the flow aloft. A back-sheared anvil often implies a very strong updraft and a high severe weather potential. (See Fig. 7, supercell.) ...

They usually appear on the upwind side of a back-sheared anvil, and indicate rapid expansion of the anvil due to the presence of a very strong updraft. They are not mammatus clouds. See also cumuliform anvil, anvil rollover.

Anvil Rollover - [Slang], a circular or semicircular lip of clouds along the underside of the upwind part of a back-sheared anvil, indicating rapid expansion of the anvil. See cumuliform anvil, knuckles, mushroom.

Venturi effect: the speedup of air through a constriction due to the pressure rise on the upwind side of the constriction and the pressure drop on the downwind side as the air diverges to leave the constriction.

Chinook arch - Altostratus clouds downwind of a mountain range. Visible gap between overhead sheet and upwind horizon, when viewed from the ground below.

( However, these same areas may be the only places to experience moist convection in winter and provided the air is cold enough, and the sea is close and upwind, then snow showers can be frequent. ) Heat from major urban areas (provided areally ...

Upwind: When walking the wind will be from front to your back.
UTC: Universal Tome
Unstable Air: Air which rises easily.
UV Rays: (UV) Ultraviolet Radiation: Shortwave electromagnetic radition emitted by the Sun.

Upward total radiation Solar and terrestrial radiation directed upward (away from the earth's surface); outgoing radiation. Upwind In the direction from which the wind is blowing. UTC Coordinated Universal Time.

It influences climate by bringing colder, more nutrient-rich water to the surface. A vital factor of the El Nino event. UPWIND The direction from which the wind is blowing. Also the windward side of an object.

See also: Cloud, Clouds, Air, Storm, Weather