In fact, you can have a very nice weather in a high pressure zone, with clear sunny sky and little wind, but during daytime, the pressure drops a little to climb up again during the night. That is a normal diurnal variation of pressure; when it is hot, air rises and pressure drops a bit. It is not the drop in itself but the rate of fall that is the most important point and that's why some people have barographs that register the pressure over time. An old seafarer's rule is that a pressure fall of ten millibars (today, called hecto-Pascal) in eight hours is a certain sign of a gale force wind coming in. And that is the only thing that is 100 percent certain in meteorology; a pressure fall must be followed by a wind of air trying to fill again the lower pressure.
Causes Of Enlarged Kidneys In Fetus. While in some cases, enlarged kidney may not be associated with any apparent cause, there are some common causes that have been identified, Vesicoureteral reflux: This condition is associated with faulty functioning of the valves which are present at the juncture of the ureters and the urinary bladder.
However, in some cases, the enlarged ovary may twist or become dysfunctional. Ovarian cancer and benign tumors may also lead to an enlarged ovary. Common causes of an enlarged ovary include: Corpus luteum cyst (cyst present in the second half of the menstrual cycle) Dermoid cyst (benign tumor also known as a teratoma) Follicle cyst (cyst that forms during the menstrual cycle) Endometrioma (endometriosis affecting the ovary)