Post-storm Report A report issued by a US National Weather Service office summarizing the impact of a tropical cyclone on its forecast area. These reports include information on observed winds, pressures, storm surges, rainfall, tornadoes, damage and casualties. Post-tropical cyclone A cyclone that no longer possesses sufficient tropical characteristics to be considered a tropical cyclone. Post-tropical cyclones can continue carrying heavy rains and high winds. Note that former tropical cyclones that have become fully extratropical...as well as remnant lows...are two classes of post-tropical cyclones. Potential tropical cyclone At the start of the 2017 season, the NHC changed their internal policy to allow advisories and thus tropical cyclone watches and warnings to be issued for tropical disturbances that do not yet satisfy the definition of a tropical cyclone, but have a high chance at becoming one, and pose the threat of tropical storm-force winds to landmasses within 48 hours. These systems are designated as "Potential Tropical Cyclones". Preliminary Report Now known as the "Tropical Cyclone Report". A report summarizing the life history and effects of an Atlantic or eastern Pacific tropical cyclone. It contains a summary of the cyclone life cycle and pertinent meteorological data, including the post-analysis best track (six-hourly positions and intensities) and other meteorological statistics. It also contains a description of damage and casualties the system produced, as well as information on forecasts and warnings associated with the cyclone. NHC writes a report on every tropical cyclone in its area of responsibility. Present Movement The best estimate of the movement of the center of a tropical cyclone at a given time and given position. This estimate does not reflect the short-period, small scale oscillations of the cyclone center. R Radius of maximum wind The distance from the center of a tropical cyclone to the location of the cyclone's maximum winds. In well-developed hurricanes, the radius of maximum winds is generally found at the inner edge of the eyewall. Radius of outermost closed isobar (ROCI) One of the quantities used to determine the size of a tropical cyclone. The ROCI is determined by measuring the radii from the center of the storm to its outermost closed isobar in four quadrants, which is then averaged to come up with a scalar value. It generally delimits the outermost extent of a tropical cyclone's wind circulation. Rapid intensification An increase in the maximum sustained winds of a tropical cyclone of at least