Class-2-warnings were issued by the Swedish Meteorological and Hydrological Institute. These variables may be hydrographic, meteorological, and geographic. It is the principal agency responsible for meteorological observations, weather forecasting and seismology. The earliest almanacs were calendars that included agricultural, astronomical, or meteorological data. The atmospheric background varies greatly with wind direction and meteorological conditions. India also operates geostationary satellites called INSAT which carry instruments for meteorological purposes. Telemetry has been used by weather balloons for transmitting meteorological data since 1920. Nanoparticles are naturally produced by many cosmological, geological, meteorological, and biological processes. The last decade was the warmest in the history of meteorological observations of Moscow. Tornadoes are among the most violent known meteorological phenomena. Continued records of tides and meteorological conditions were also required. Operations under instrument meteorological conditions were not permitted. Others host visitors for science, conservation, meteorological observation and tourism. Procedures used after launch are based on meteorological and environmental conditions. It is a primary instrument for flight in instrument meteorological conditions.