obscuration


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obscuration

[‚äb·skyu̇′rā·shən]
(meteorology)
In United States weather observing practice, the designation for the sky cover when the sky is completely hidden by surface-based obscuring phenomena, such as fog. Also known as obscured sky cover.

obscuration

A condition in which the sky, or the dividing line between a cloud and the clear air below, is completely hidden by surface-based obscuring phenomena such as fog, mist, or smoke. Also known as obscured sky cover.
References in periodicals archive ?
This required capability is cross-domain obscuration. The objective of cross-domain obscuration is to deny enemy forces the ability to acquire and target friendly forces across the EMS.
The PSS APS 780 autodilutor is designed to deliver and dilute a fixed volume of a concentrated emulsion or suspension to a light obscuration sensor for particle/globule counting and sizing.
We report a different method in this paper, in which the series of suspensions is measured in a light obscuration counter.
Symptoms that patients may report include blurred vision from optic nerve dysfunction or from induced hypermetropia (the eyeball is shortened by pressure from the dilated optic nerve sheath), transient visual obscurations (often postural), photopsias and transient or persistent diplopia (there may be third, fourth or sixth cranial nerve palsy due to raised ICP).
Visibility along a path can be calculated from smoke obscuration as
occultation Complete or partial obscuration of an astronomical object by another.
Using light obscuration technology, the new particle counter produces accurate and reliable test results in just two minutes.  When used in the laboratory, the Icount ACM20 uses a case mount pump to draw a test sample into the machine.  When used in the field, it can be connected directly to an existing sample point using a supplied quick connect fitting up to a maximum of 420 bar pressure.
But while the news is positive for United in the short-term, Owen's obscuration has effectively put them on notice of his intention to leave the club.
As a result, frequent automated checking for counter-feits regardless of misorientation and obscuration and with high integrity will be a matter for interminable RFID trials and little more.
As they settle, particles are detected by a sensor; typical methods include X-ray attenuation and light obscuration. These measurements offer a basis for determining the density of particles of a given size at a particular moment.
However, obtaining an AP or PA projection of the patella completely free of bony obscuration from the relatively dense condylar and epicondylar portions of the distal femur sometimes is difficult because of the position of the patella in relation to the femur.