OPAQUE
A condition where a material, such as a cloud, blocks the passage of radiant energy, especially light. Opaque sky cover refers to the amount of sky cover that completely hides all that might be above it.
An opaque coating of tiny, white, granular ice particles caused by the rapid freezing of supercooled water droplets on impact with an object. See also clear ice.
RIOGD
Rio Grande ...
White, opaque, approximately round ice particles between 2 and 5 mm in diameter that form in a cloud either from the sticking together of ice crystals or from the process of accretion.
Snow rollers(6) ...
Less than 4/10 opaque clouds, no precipitation, no extremes of visibility/temperature/wind
SKYWARN A nationwide network of volunteer weather spotters who report to and are trained by the National Weather Service.
FairDescribes weather in which there is less than 4/10ths of opaque cloud cover, no precipitation, and there is no extreme visibility, wind or temperature conditions.Fall windA strong, cold, downslope wind.
SNOW GRAINS Frozen precipitation in the form of very small, white, opaque grains of ice. The solid equivalent of drizzle. It is reported as "SG" in an observation and on the METAR.
Snow grains Precipitation of very small, white, opaque particles of ice, fairly flat or elongated, with diameters less than 1 mm. The solid equivalent of drizzle.
caliche Also called hardpan; an opaque, reddish-brown-to-white calcareous material, which occurs in layers near the surface of stony soils in arid and semiarid areas. Calvin cycle The incorporation of CO2 into glucose by enzymatic reactions.
Mostly ClearWhen the 1/8th to 2/8ths of the sky is covered by with opaque (not transparent) clouds. Sometimes referred to as Mostly Sunny if this condition is present during daylight hours.
°F = (°C * 9/5) + 32FairIt is usually used at night to describe less than 3/8 opaque clouds, no precipitation, no extremes of visibility, temperature or winds. It describes generally pleasant weather conditions.
hailstonesTransparent or partially opaque particles of ice that range in size from that of a pea to that of golf balls.
Snow Grains: Very small, white, opaque grains of ice.
Pressure Altitude: The standard altitude of a given pressure: Example 500 mb = 18,000 ft.
rime - A white or milky and opaque granular deposit of ice formed by the rapid freezing of supercooled water drops as they impinge upon an exposed object.
snow pellets"(Also called soft hail, graupel, tapioca snow.) Precipitation consisting of white, opaque, approximately round (sometimes conical) ice particles having a snowlike structure, and about 2-5 mm in diameter.
Rime: Ice that is opaque, milky and crystalline ice forming on vertical and horizontal surfaces by the freezing of supercooled water.
Rime Ice It is a rough, milky, opaque ice formed by the instantaneous freezing of small supercooled droplets as they strike the aircraft.
SNOW PELLETS Frozen precipitation in the form of white, round or conical opaque grains of ice. Their diameter ranges from 0.08 to 0.2 inch (2 to 5 mm).
FAIR - Less than 4/10 opaque cloud cover, no precipitation, and no extremes in temperature, visibility or winds.
FCST- Forecast
FIRE UP- A favorite phrase of forecasters. It means storms are developing or will develop.
Precipitation of either transparent, or partly or completely opaque particles or ice (hailstones) usually spheroidal, conical or irregular in form and of diameter very generally between 5 and 50 millimeters, ...
Mostly Cloudy: When the predominant/average sky condition is covered by more than half, but not completely covered by opaque (not transparent) clouds. In other words, 5/8 to 7/8 of the sky is covered by opaque clouds.
Snow pellets White, opaque, approximately round ice particles between 2 and 5 millimeters in diameter that form in a cloud either from the sticking together of ice crystals or from the process of accretion.
Snow Pellets - precipitation in the form of white, opaque, approximately round ice particles, about 2 to 5 mm in diameter, with a snow-like structure
Snow Shower - intermittent snow falling from a convective cloud ...
When the predominant/average sky condition is covered by more than half, but not completely covered by opaque (not transparent) clouds. In other words, 5/8 to 7/8 of the sky is covered by opaque clouds. Same as Considerable Cloudiness.
Snow Grains- Precipitation of very small, white, opaque grains of ice.
Snow Pellets- Precipitation of white, opaque grains of ice. The grains are round or sometimes conical. Diameters range from about 0.08 to 0.2 inch (2 to 5 mm).
Hail - Precipitation in the form of transparent or partially opaque balls or irregular lumps of concentric ice. Hail is normally defined as having a diameter of 5 millimeters or more and is produced by thunderstorms.
A multiple-vortex tornado had just dissipated from beneath this distant updraft, and an opaque precipitation shaft was developing in the previously rain-free area where the tornado occurred.
flow field ...
Snow grains Frozen form of precipitation consisting of opaque particles of white ice having diameters less than 1 mm; originates in the same way as drizzle.
Different frequencies attenuate at different rates, such that some components of air are opaque to some frequencies and transparent to others. Radio waves used for broadcasting and other communication tend to suffer the same effect.
TurbidityThe thickness or opaqueness of water caused by the suspension of matter. The turbidity of rivers and lakes increases after a rainfall.TurbulenceIrregular motion of the atmosphere, as indicated by gusts and lulls in the wind.
 See also: Surface, Air, Cloud, Layer, Water
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