Apparatus and methods for passively and remotely and continuously locating, monitoring, and measuring present weather and nowcasting and forecasting weather and meteorological phenomena and parameters by utilizing observations of infrared emissions and reflections are disclosed. Based on observations of an instrument such as an infrared noncontact thermometer, the methods provide useful information on the presence of aerosol, dust, cloud, and precipitation for the purpose of determining present weather, weather tracking, weather nowcasting, and weather forecasting as well as other weather phenomena. One embodiment of this invention is an infrared sensor pointed vertically and reflected from a suitable mirror rotating about a vertical axis such that the field of view of the sensor scans azimuthally at an elevated angle above the horizon.

 
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