Our destination is 3JO. The weather upon our arrival according to the Graphical Aviation Forecast is ceiling at 2500' and visibility at 5 miles. Do we need an alternate?

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First, let's restate the scenario and the choices to ensure clarity.
- Question: Our destination is 3JO. The Graphical Aviation Forecast shows ceiling 2500' and visibility 5 miles upon arrival. Do we need an alternate?
- Answer options: 1) Yes  2) No

Now, analyze each option step by step.
Option 1: Yes
- Why someone might think this is true: They may recall that alternates are sometimes required when the destination weather is marginal or forecasts indicate weather below certain minimums at arrival.
- Why this is incorrect given the data: The relevant rule for requiring an alternate is tied to forecast weather at destination at the ETA (and sometimes within a time window around ETA) relative to standard alternate minimums. A forecast of 2500 feet ceiling and 5 miles visibility exceeds the common alternate minimums of 2000 feet ceiling and 3 miles visibility. Since the forecast meets or improves these thresholds, the FAA requirement to file an alternate is not triggered in this scenario. Therefore, claiming that an alternate is required would be inconsistent with the standard alternate-minimums criteria based on the given forecast.

Option 2: No
- Why this is correct given the data: With a forecast of 2500' ceiling and 5 miles visibility at ETA, the weather meets the typical alternate-minimums criteria (at or above 2000' and 3 miles). This means you are not obligated to designate an alternate under the standard IFR procedures that require an alternate only when the destination weather at ETA does not meet those minimums. The forecast indicates adequate weather for a direct arrival to 3JO without needing an alternate.
- Additional nuance to consider: If there were any special airport constraints, an unusual approach, or if the forecast window around ETA extended beyond the standard lookahead, the decision could differ. But strictly from the given data (ceiling 2500', visibility 5 miles at arrival), the requirement for an alternate is not triggered under the typical rule set.

Summary of reasoning differences:
- The “Yes” option implies the weather is insufficient for not having an alternate, but the numbers (2500' / 5 miles) comfortably meet standard alternates thresholds (2000' / 3 miles).
- The “No” option aligns with these thresholds, indicating no alternate is required based on the forecasted arrival weather.

Note on potential confusion: If one misconstrues the rule and believes any forecast surface weather below a certain level necessitates an alternate, that would be a misconception. The key is the comparison to the established minimums (typically 2000' ceiling and 3 miles visibility) used for determining the need for an alternate.

FA_221 Lesson 35 Quiz

Our destination is 3JO. The weather upon our arrival according to the Graphical Aviation Forecast is ceiling at 2500' and visibility at 5 miles. Do we need an alternate?

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