An aviation safety researcher has posted satellite imagery which appears to show stormy weather on the planned flight path of AH5017.
The diagonal green area is near Gao in Mali, where the plane was said to have lost contact.
In a separate tweet, Mr Proud adds: "Athough there were storms, it is normal for the region. This was a big one, but not atypical."
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Friday will see sunny spells across Northern Ireland and Scotland, but also some scattered showers turning heavier.