521 Squadron of the Royal Air Force was a Second World War meteorological observation unit operating from Norfolk.

It took part in Coastal Command's Meteorological operations[4] The squadron had inherited from its 1401 flight aircraft such as Gloster Gladiator biplanes and some Hawker Hurricanes.

The operations of the original Flights and later the Squadron was taking meteorological information for weather forecasting – previously provided by merchant shipping to the Met Office.

The squadron's Mosquitoes would operate on "PAMPA" flights that took them deep into occupied Europe to assess the weather over target areas for the bombers.

[5][6][7] The squadron reformed on 1 September 1943 at RAF Docking, a satellite of the Bircham Newton station, adding to its original equipment Handley Page Hampdens, but doing without the earlier Mosquitos and Blenheims.