Cyclonic Storm Pressure
المؤلف:
GEORGE A. HOADLEY
المصدر:
ESSENTIALS OF PHYSICS
الجزء والصفحة:
p-175
2025-11-11
30
The relation between the readings of the barometer and the direction of the wind in circular or cyclonic storms may be studied in connection with the weather map, Fig. 161. At the center, or eye of the storm (marked Low), the pressure is least; while at the outside the pressure is greater, and the air therefore rushes toward the center. In. the northern hemisphere winds are deflected to the right by the rotation of the earth. In approaching the center of low pressure, therefore, the direction of each air current is to the right of the center. This gives to the storm a rotary motion in a counter-clockwise direction; and if a person stands with his back to the wind, the storm center, or region of lowest barometer, will be on his left hand.
The observations of the Weather Bureau on barometric pressures for a series of years indicate that there is a well-defined movement of low pressures, or storm centers, across the continent. These areas of low pressure generally enter the United States on the northwest boundary, coming from British America, move southeastwardly until they have crossed the Rocky Mountains, and then turn northeastwardly and disappear on the Atlantic coast, or pass down the St. Lawrence River. The storms that come into the country from the Gulf of Mexico usually travel northeast along the Atlantic coast.
الاكثر قراءة في الميكانيك
اخر الاخبار
اخبار العتبة العباسية المقدسة
