Terminal Radar: It’s the Weather Pilots Don’t See

Many approach control facilities have airport surveillance radar physically located on the field.

Scott Dennstaedt, Ph.D

Monday, May 26, 2025 at 07:00 AM ET

Verified

Edited By:

Travis Tingle

During the warm season, many pilots will tell you that they are dependent on their datalink weather. [Courtesy: Scott Dennstaedt]

Key Takeaways:

Pilots should rely on Air Traffic Controllers (ATC) for critical, near real-time weather guidance in high-impact terminal areas, as datalink weather systems can have significant latency.
ATC facilities are equipped with advanced ground-based radar systems, such as Airport Surveillance Radar (ASR) and Terminal Doppler Weather Radar (TDWR), which provide high-resolution and frequently updated weather data.
The Terminal Doppler Weather Radar (TDWR) is particularly effective at detecting hazardous low-level wind shear and microbursts, often originating from visually benign storms, and delivers timely, specific alerts to pilots.
The combination of advanced ground-based radar technologies (like TDWR) and enhanced pilot training has dramatically improved aviation safety, virtually eliminating wind shear-related fatalities since 1995.

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Even if you have a datalink weather capability in the cockpit, don’t give up on your air traffic controllers. Many other technologies are at work—albeit unseen, but critical to get the pilot back on the ground safely.

This is especially true when flying through a high-impact terminal area during the warm season when convective SIGMETs are sprinkled nearly everywhere. Your satellite-based weather receiver becomes less effective in the busy terminal area due to its latency—especially if an update or two is missed. The good news is that some approach controllers are armed with near real-time weather data from two additional sources to include the Airport Surveillance Radar (ASR) and Terminal Doppler Weather Radar (TDWR). Even though the controller can’t see your view outside of the cockpit, they can offer near real-time guidance around the most significant cells. This is especially critical when microbursts have reared their ugly head in and around the terminal area.