Definition
The inherent constraints of NEXRAD (Next Generation Radar) weather data when displayed in the cockpit, including age delays of up to several minutes between actual weather conditions and what appears on the screen, gaps in radar coverage, and the limitation that displayed precipitation intensity reflects a composite or mosaic image rather than real-time conditions. These limitations make NEXRAD unsuitable for tactical (close-range) thunderstorm avoidance.
Plain English
NEXRAD weather images shown on cockpit displays are not live. The picture you see can be several minutes old, may have coverage gaps, and may not show exactly what the storm is doing right now. Because of this, you should use it for big-picture planning, not for dodging individual thunderstorm cells up close.
Context Anchor
Seen when using cockpit weather displays, especially on an MFD, to view radar-based precipitation during preflight planning or in flight.
Derivation
NEXRAD stands for Next Generation Radar, a network of ground-based weather radar sites operated by the National Weather Service. The word 'limitations' is used here in the engineering sense -- the boundaries of what the system can reliably tell you -- not in the sense of flaws or defects.
Why Pilots Care
Recognizing these limits prevents over-reliance on the display and reduces the chance of inadvertently entering hazardous weather.
Analogy
NEXRAD is like a traffic map on your phone. It is excellent for deciding which route to take across a city, but you would not use it to decide whether to change lanes right now -- the picture is always a few minutes behind reality.
Grounding Statement
Use NEXRAD to make broad weather decisions, not to squeeze through small gaps near storms.
Intuition Check
Do not assume “limitations” means the system is unreliable or useless. It means NEXRAD is useful only within safe boundaries: broad awareness and planning, not real-time close-up storm avoidance.
Example Sentence 1
Because of NEXRAD limitations, the pilot used the displayed precipitation image to plan a deviation around the storm system from 50 miles away rather than to navigate between individual cells.
Example Sentence 2
Because of NEXRAD limitations such as the time delay, the storm cells shown on the display were already several miles farther east than the image indicated.