Astronomers.. Tomorrow is the beginning of spring

Ibrahim Al-Jarwan, Chairman of the Board of Directors of the Emirates Astronomy Society, member of the Arab Union for Astronomy and Space Sciences, said that the date for the astronomical start of the spring season, or the date of the astronomical spring solar equinox this year, will be tomorrow “Sunday” at 19:33 UAE time and will continue in the northern half of the Earth until next June 21 Where is the summer solstice.

Al-Jarwan pointed out that the most important astronomical phenomena in this season are the perpendicularity of the sun on the equator at the beginning of the spring equinox on March 20 and 21, then this perpendicular crawling north until it reaches the Tropic of Cancer at the summer solstice on June 20 and 21 next, and the length of night and day are equal in The week preceding the vernal equinox, then the length of the day begins to gradually increase. As for the inclination of the sun at meridian or noon, it is about 65 degrees from the azimuth “middle of the sky” at the beginning of the season, then the sun approaches the zenith (above the observer’s head) at its end at the time of the summer solstice. The tilt reaches 88 degrees and the meridian shadow fades at that time.

He explained that the spring season is characterized by mild weather, and the average temperature at its beginning is approximately 16 degrees at the minimum and close to 28 at the maximum. And April and be dry during the next April and May.

He pointed out that during the first half of this season, warm and humid air masses coming from Central and Eastern Africa, and cold air masses coming from Europe will converge over the atmosphere of the Arabian Peninsula, in addition to the wide thermal differences between the air masses that affect the region and between the surface of the Earth and the upper air layers with what they do. On the formation of frequent atmospheric instability during this period, forming a state of atmospheric turbulence, with which the winds may intensify and cumulus clouds are formed that are accompanied by heavy rain.

He noted that the arrival of dusty waves is likely during this season, and these rapid weather changes during the spring transitional periods are called 'spring weather disturbances'. From mid-May to the end of July, it is the dry north wind that blows from time to time during the summer and is dry and dusty at times.

Al-Jarwan said, "During the second half of the spring season, tropical conditions begin in the Arabian Sea and the northern Indian Ocean, and the season of tropical conditions begins with all its types" tropical depression, tropical storm and tropical cyclone" in the northern Indian Ocean and the Arabian Sea from the beginning of May to the end of June. Maximum between mid-May to mid-June, with a probability of forming a tropical condition in the Arabian Sea at a rate of 40 percent over the rest of the months of the year, pointing out that during the past sixty years, the number of tropical cases that were classified as a hurricane and affected the Arabian Sea exceeded more than 25 tropical cyclones at the rate of a hurricane. At least one orbital period in a three-year period.

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