Look beyond the departure window
A clear view from a terminal covers only one place and moment. A journey also involves a destination, a route and an aircraft arriving from somewhere else. The FAA's weather FAQ explains how storms can restrict usable airspace and reduce capacity. This provides a possible network explanation for a delay away from the visible weather. It does not establish the actual cause of your flight's disruption; that needs the relevant official or airline update.
Compare the right weather product
An observation describes reported conditions at a time and location; a forecast describes expected conditions for its stated period. The Aviation Weather Center data guide distinguishes products such as METAR observations and TAF forecasts. When reading a screenshot, retain its station, product type and time. A fresh browser page containing an older report is still an older report. Nor does a single airport observation describe weather everywhere along a possible route. Use these differences to frame a question, not to decide whether an aircraft should operate.
Do not reverse-engineer a flight's cause from a map
A storm near a route drawn on a public tracker may be relevant context, but proximity alone does not demonstrate causation. The displayed route could be incomplete, the aircraft position could be delayed, and the weather image could refer to another time. Mark these uncertainties explicitly. A useful comparison records each source's timestamp and distinguishes a published reason from your own hypothesis. Avoid sharing a confident explanation that the airline or traffic authority has not actually given.
Historical weather categories are not a live explanation
The BTS delay-cause explanation shows that weather-related effects are not confined to the extreme-weather category. This matters when reading a chart: a small slice with that label is not a complete measure of every weather influence. Historical reporting categories also cannot tell you the cause of an individual disruption today. Keep an annual or monthly statistical finding labelled with its period rather than attaching it to a current aircraft marker.
Use a source-first sequence
For travel, first read your operating airline's message. Next check any applicable airport or FAA advisory and its time. Then use weather sources or PocketWorld for geographic context if that helps you understand the published explanation. Do not calculate a new departure time from how fast a storm appears to move. PocketWorld does not provide dispatch decisions, route clearances or a safety assessment. When the evidence does not identify a cause, “not confirmed by the available sources” is a more useful conclusion than guessing from a clear sky or a colourful map.
Data sources
Official references are linked beside the explanations above. This educational guide does not provide current flight status, navigation, dispatch or safety advice.