These simulators also offer extremely good visibility into the design for debugging purposes, and they can evaluate the effects of delay-related narrow pulses and glitches that are very difficult to find using other techniques.
Sanders said she believes the fire is not actively spreading, although she noted it's difficult to evaluate the fire's reach because of "extremely restricted" visibility.
Neither of the Air Force fighter pilots saw anything exit the airliner, either visually or on radar, nor did they see a parachute open; but at night, with extremely limited visibility and cloud cover obscuring any ground lighting below, an airborne human figure clad entirely in black clothing could easily have gone undetected.
On clear nights with extremely good visibility, urban sky glow is caused by the scattering of light by molecules (Rayleigh scattering).
Nevertheless, in conditions of extremely low visibility, vocalisations of the corncrake must play an especially important social role, limiting the frequency of territorial conflicts and facilitating mutual localisation.
For intermediates like myself, those trails were challenging, but never excessively so, even when snow was falling and visibility extremely limited.
The roads and areas that have been closed are unsafe due to fire-weakened, burned trees that pose a risk of falling, as well as frequently heavy smoke making visibility extremely poor.
That makes screen visibility extremely important.
