Who's Looking Matters

Recently, a friend who flies out of Houston Hobby (KHOU) shared something thats bothered him for some time. Just seven miles east of Hobby is Ellington Field (KEFD), a joint-use military/civilian airport. Both airports issue TAFs. Hobbys TAFs come from the NWS and Ellingtons are issued by the military. Interestingly, sometimes there is a great disparity between the forecasts. Do they each have their own biases? Are they looking through different glasses? Its like asking two witnesses what they see in an accident that hasnt happened yet.

Editorial Staff

Monday, March 07, 2016 at 12:00 AM ET

Verified

Key Takeaways:

Civilian (NWS) and Military Terminal Aerodrome Forecasts (TAFs) differ significantly in format, specific elements included (e.g., military TAFs include QNH, wind shear, icing, turbulence, and temperatures), and terminology used for changes.
NWS forecasters, serving general public and commercial aviation, may lean towards an "optimistic outlook" or "benefit of doubt" bias in their forecasts.
Military forecasters, conversely, aim for "brutally honest" or "pessimistic" forecasts to prepare crews for the worst potential conditions.
These differing operational goals and biases lead to noticeable disparities in forecasts, even for geographically close airports, requiring pilots to consider the forecaster's perspective.

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Police-officer friends often share frustration they have piecing together an accident from testimony of the participants and the witnesses. Everyone has their own biases and perspective.

Recently, a friend who flies out of Houston Hobby (KHOU) shared something that’s bothered him for some time. Just seven miles east of Hobby is Ellington Field (KEFD), a joint-use military/civilian airport. Both airports issue TAFs. Hobby’s TAFs come from the NWS and Ellington’s are issued by the military. Interestingly, sometimes there is a great disparity between the forecasts. Do they each have their own biases? Are they looking through different glasses? It’s like asking two witnesses what they see in an accident that hasn’t happened yet.