ADJUSTING YOUR FLIGHT PLAN
How to Adjust Your Flight Plan When the Weather Changes
Weather is one of the most dynamic and unpredictable factors in aviation. Even a perfectly planned flight can require last-minute changes if conditions deteriorate or shift before departure.
Good pilots don’t just react, they adapt.
Here’s what to consider when the weather changes before the flight.
1. Re-check the latest METAR and TAF
Start with the basics: check the most recent METARs and TAFs. Look for changes in:
Visibility
Wind speed and direction
Ceilings and cloud coverage
Presence of fog, thunderstorms, or icing conditions
These updates can directly affect your departure, enroute, and arrival plans.
2. Rethink your alternate
If your destination’s weather drops below minima or becomes questionable, your original alternate might no safe.
Recalculate your fuel needs based on a more distant or suitable alternate. Double-check alternate weather requirements and NOTAMs as well.
3. Adjust fuel planning
Unfavorable winds, longer routes, or holding patterns due to poor weather may all require extra fuel.
In commercial ops, that means checking for:
Contingency fuel
Alternate fuel
Final reserve
Any additional required by company SOPs
For GA pilots, it’s even more important to plan conservatively. Margins matter.
4. Change your departure/arrival procedures
Low visibility, wet runways, or gusty crosswinds may make certain SIDs or STARs less favorable or even unavailable.
Can you still meet the required climb gradients?
Are the minimums for your approach still met?
Will a circle-to-land still be allowed?
Rebrief the updated procedures clearly with your crew or instructor.
5. Know your aircraft’s limitations
If there's a risk of icing, does your aircraft have certified protection? If there’s wind shear or convective weather, are you trained and comfortable flying through those conditions?Is the crosswind within limits?
6. Brief your plan B (and C)
When the weather changes, your alternate plans become more important than ever. Brief a missed approach.Review holding procedures. Be mentally prepared to delay, divert, or even cancel.
7. Communicate with ATC and Dispatch
If you're in a commercial environment, stay in close contact with dispatch. They may have access to more recent updates and can suggest alternate routes.
If you’re flying GA, call the tower, ATIS, or Flight Service for a real-time update before engine start.
When weather changes. Plans must follow.
Professional pilots adjust early and smart. That means gathering the latest information, recalculating your options, and keeping safety above all.
Better to delay or reroute than to push into uncertainty.