Green DOT Syndrome, by UHST, March 2026

Republished in the EASA Community Rotorcraft to raise awareness and support dissemination of the safety message.

How to avoid the “green DOT syndrome”

Green DOT Syndrome – USHST, March 2026

Article by Matt Johnson, FAA Designated Pilot Examiner (DPE), Single‑Pilot Instrument Flight Rules (SPIFR) Air Medical Helicopter Pilot at Metro Aviation, Inc.

Summary

Many pilot applicants do not struggle with weather theory itself, but rather with applying and interpreting real‑world weather information, particularly when relying on colour‑coded displays on electronic flight bags (EFBs). 

Although most can define ceilings, visibility, and cloud‑clearance rules, many pilots simply glance at a “green” display and assume conditions are suitable, missing critical details. 
 

The 'green dot' displayed ion an Electronic Flight Bag

A common misunderstanding is how quickly a non‑ceiling layer – reported as FEW or SCT – can become a ceiling, as a ceiling begins at five oktas (broken or overcast).

EFBs show VFR as “green”, but this only reflects ceilings above 3,000 ft AGL and visibility greater than five miles. Pilots often overlook lower FEW or SCT layers that may sit just one okta above becoming MVFR, IFR, or even LIFR. This over‑reliance on green coding – dubbed “green dot syndrome” – can lead to departures into unexpectedly low conditions.

To address this risk, the author requested that the US National Weather Service highlight potentially significant FEW and SCT layers below 3,000 ft. The NWS implemented an orange ring around green dots on aviationweather.gov when such layers are present. This new feature helps draw attention to low cloud layers that are not technically ceilings but may still affect safe flight operations. 

Pilots are encouraged to use this enhanced display as part of a more thorough weather assessment, both in practice and on check‑ride day.

Acronyms

FEW = Few = 1–2 oktas of cloud cover
SCT = Scattered = 3–4 oktas of cloud cover
BKN = Broken = 5–7 oktas of cloud cover
OVC = Overcast = 8 oktas of cloud cover
EFB – Electronic Flight Bag
VFR – Visual Flight Rules
AGL – Above Ground Level
MVFR – Marginal Visual Flight Rules
LIFR – Low Instrument Flight Rules
NWS – US National Weather Service

References

Green DOT Syndrome – USHST
Featured in VAI DAILY of March 6, 2026 (https://verticalavi.org/news/vai-daily/)