I have recently started using the free weather API to get current weather at a given lat/lon and most of the time this works well. But a few times, the weather suddenly changes to 503, "very heavy rain" when this is completely inappropriate. It is doing this now at lon=>-1.130000, lat=>51.250000 @ 17:15 GMT. The weather has been pretty much clear sky all day, but currently shows "very heavy rain" when there is not a cloud in the sky.
Is there some kind or problem giving anomalous rain, or is the data unreliable here?