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 datalink weather in busy terminal areas due to its latency, as air traffic controllers (ATCs) offer crucial, near real-time weather guidance.
ATCs utilize advanced ground-based radar systems like Airport Surveillance Radar (ASR) and Terminal Doppler Weather Radar (TDWR) to provide frequently updated weather information, including detailed wind shear and precipitation data.
The TDWR is particularly effective for detecting hazardous low-altitude wind shear and microbursts, which can originate from seemingly benign cells and pose a significant threat to aircraft.
These sophisticated ground-based detection systems, combined with enhanced pilot training, have been instrumental in virtually eliminating wind shear-related aviation fatalities in the U.S. 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.