Air traffic controllers have multiple radar systems in place to track flights over land and sea, so when a plane disappears from radar, it's usually a sign that it's lost power, switched off its transmitters or dropped below cruising altitude.
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Tracking of certain flights, governmnt, military mission flights and so on, are blocked to prevent tracking… It means the owner has requested that the craft's details (tail #, filed flight plan, etc) not be displayed.
Red: When an aircraft is displayed as red that means that you are currently following that specific aircraft on the map or that an emergency squawk is on for this aircraft.
The position is calculated based on many different parameters and in most cases it's quite accurate, but for long flights the position can in worst cases be up to about 100 km (55 miles) off. In settings there is an option to set for how long time you want to see estimated aircraft on map.
I often see military flights in the sky, which do not appear on FlightRadar24. I do understand that low-flying military airplanes do no necessarily get picked up by these trackers, and that some military aircrafts switch of transponders. However some flight do appear on this ADSB-Tracking website.
Yes, weather radar can help predict convective turbulence and clear air turbulence. Most commercial aircraft now pack weather radar – from the Airbus A321 to the Boeing 777.
It's important to note that pilots do not see other planes on radar directly. Instead, air traffic controllers use radar to track the location and altitude of planes in their airspace, and then communicate this information to pilots through their cockpit instruments and radios.
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