This light appears reddish due to the Rayleigh scattering of blue light, the same reason sunrise and sunsets are more orange than during the day. When the moon is totally eclipsed by the Earth, it takes on a reddish color that is caused by the planet when it completely blocks direct sunlight from reaching the Moon surface, as only the light reflected from the lunar surface has been refracted by Earth's atmosphere. The type and length of a lunar eclipse depend on the Moon's proximity to the lunar node.
#PICTURE OF LUNAR ECLIPSE DIAGRAM FULL#
This can occur only when the Sun, Earth, and Moon are exactly or very closely aligned (in syzygy) with Earth between the other two, which can happen only on the night of a full moon when the Moon is near either lunar node.
Such alignment occurs during an eclipse season, approximately every six months, during the full moon phase, when the Moon's orbital plane is closest to the plane of the Earth's orbit. For detailed information, please refer to the Weather Radar Image website.Latter phases of the partial lunar eclipse on 17 July 2019 taken from Gloucestershire, United KingdomĪ lunar eclipse is an astronomical event that occurs when the Moon moves into the Earth's shadow, causing the moon to be darkened. The Hong Kong Observatory's radar images closest to the time of tropical cyclone analysed position can be shown by pressing the 'Radar Image' button, below which is the 'Time of image' representing the time when radar completes its scan.Since it takes time to receive and process the satellite data as well as generate the image, the time of image may somtimes be different from the time of tropical cyclone analysed position. The infra-red satellite image closest to the time of tropical cyclone analysed position can be shown by pressing the 'Satellite Image' button, below which is the 'Time of image' representing the time when satellite data is completely received at the ground reception system.These departures are partly due to uncertainties in locating the centre of the tropical cyclone, and partly due to actual short-term variations in the direction and speed of movement of the tropical cyclone itself. Short-term erratic departure of the tropical cyclone from the general direction of movement may occur from time to time.The corresponding radius of 'Potential Track Area' is determined from the statistics in the past years as the mean value. Such real-time positions could deviate from those obtained later through "Best Track Analysis" when more comprehensive sets of observations become available. *Analysed position refers to the positions of tropical cyclones fixed by the Observatory based on observation data available in real time. The size in terms of radius of the 'Potential Track Area' corresponding to different forecast hours are determined from the error statistics of the forecasts issued in past years (updated in 2022) and are as shown in the following table:
It will be particularly larger beyond 72 hours and is indicated with lighter shadings on the map. The area grows as the forecast hour increases. Literally, it means that among 10 times of track forecast for similar situations, the tropical cyclone will be centred within the indicated area in about 7 times. By pressing the 'Potential Track Area' button, the probable area within which the tropical cyclone will fall with a probability of 70% will be shown.
No Tropical Cyclone Warning Signal in force
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