How would you evaluate weather information to decide if a diversion or alternate is necessary?

How would you evaluate weather information to decide if a diversion or alternate is necessary?

• A. Weigh forecasted conditions, remaining fuel margins, available alternates with acceptable approaches, and likelihood of METAR/TAF changes to determine the safer option.
• B. Only current METAR is considered.
• C. Diversion is chosen if it starts to rain.
• D. Weather is not considered in route planning.

Answer: (C)

Evaluating weather for a diversion or alternate is about a forward-looking risk assessment that combines forecasted conditions with fuel and available options. You don’t rely on the current snapshot alone; you compare forecasted weather at the destination and potential alternates, examining METARs and TAFs for current conditions and expected trends, including ceilings, visibility, icing, and convective activity, plus the likelihood of deterioration before you could safely land. Then you assess your fuel margins to ensure you can reach the chosen alternate with a safe reserve and verify that the alternate has an acceptable instrument approach and availability of needed procedures. If the forecast suggests conditions will worsen or remain marginal, the safer choice is to divert or select an alternate to maintain required safety margins. Relying on rain starting as the trigger is reactive and ignores the broader weather picture and planning margins.

Evaluating weather for a diversion or alternate is about a forward-looking risk assessment that combines forecasted conditions with fuel and available options. You don’t rely on the current snapshot alone; you compare forecasted weather at the destination and potential alternates, examining METARs and TAFs for current conditions and expected trends, including ceilings, visibility, icing, and convective activity, plus the likelihood of deterioration before you could safely land. Then you assess your fuel margins to ensure you can reach the chosen alternate with a safe reserve and verify that the alternate has an acceptable instrument approach and availability of needed procedures. If the forecast suggests conditions will worsen or remain marginal, the safer choice is to divert or select an alternate to maintain required safety margins. Relying on rain starting as the trigger is reactive and ignores the broader weather picture and planning margins.