FMI Radar Network

The Finnish Meteorological Institute has a network of ten radars, which covers most of the country. In addition, data from neighbouring countries, obtained though the international exchange, improves the coverage especially on sea areas.

Coverage of FMI's radar networkA radar sees the weather phenomena to a distance of 250 km in the Finnish climate. Therefore a network of several radars is needed to cover bigger land areas. The coverage depends on the weather conditions. Summer rain is seen to a distance of 250 km and more (outer line in the figure), and winterly snowfall to a distance of 120 km (circles in the figure).

The FMI Radar Network

  • 9 dual-polarization  C-Band Doppler radars: Vantaa, Anjalankoski, Ikaalinen, Korpo, Kuopio, Utajärvi, Luosto (upgraded 2009-2014), Kesälahti (built 2014) and Petäjävesi (built 2015)
  • 1 single-polarization  C-Band Doppler radars: Vimpeli (built 2005)
  • Fully automated network
  • Design, planning, maintenance and operation by FMI
  • Data availability annually > 98%

Technical details of FMI radars

  • Antenna diameter:  4.2 m
  • Radome: 6.7 m
  • Antenna beam width: 0.95 degrees
  • Dual-pol radars: Vaisala HW & SW
  • Single-pol radar : Selex-Gematronik HW & Vaisala-Sigmet SW
  • Transmitter: magnetron
  • Frequency: 5600-5650 MHz
  • Wave length: 5.3 cm
  • Pulse peak power: 250 kW
  • Average power: 300 W