Definition
An indicator used on aviation weather reports and forecasts to flag that an altimeter setting, pressure value, or other reported element falls outside the standard range or format normally expected, prompting the pilot or controller to give it special attention.
Plain English
A short note meaning 'this value is unusual — don't read past it as if it were ordinary.' It tells you the number you're looking at is outside the normal range and needs a closer look.
Context Anchor
Seen in aviation publications, airport information, chart notes, and other short operational notices where space is limited.
Why Pilots Care
Alerts pilots to deviations that may require different techniques, extra coordination, or specific approvals to maintain safety.
Intuition Check
NOT STD does not automatically mean unsafe or closed. It means different from the normal standard, so check what part is different before acting on it.
Example Sentence 1
The METAR included a NOT STD remark next to the altimeter setting, alerting the crew that pressure was unusually low that morning.
Example Sentence 2
The pilot received a NOT STD routing after the preferred departure procedure was unavailable.