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 not solely rely on cockpit datalink weather in terminal areas; Air Traffic Controllers (ATCs) provide crucial, near real-time guidance using advanced ground-based radar.
ATCs utilize systems like Airport Surveillance Radar (ASR) and Terminal Doppler Weather Radar (TDWR) which offer higher resolution, more frequent updates, and superior low-altitude coverage compared to datalink, especially for convective weather.
The TDWR is particularly effective at detecting dangerous low-level wind shear and microbursts, often from visually benign cells that pose significant risks to aircraft during approach and departure.
The implementation of ground-based radar technologies like TDWR, coupled with improved pilot training, has significantly reduced wind shear-related aviation 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.