For interior (or coast) stations, with onshore (or offshore) winds, in the United States during the month (or months) of +--------------------+-------+-------+-------+--------+--------+---------+------+ |Rates of Pressure | | | | | | | | |Change per Latitude | ∞-20 | 20-10 | 10-5 | 5- | 3-1/2- | 2-1/2 | etc. | |Degree | | | | 3-1/2 | 2-1/2 | -2 | | +--------------------+-------+-------+-------+--------+--------+---------+------+ |Distances between | | | | | | | | |Isobars in Latitude | 0-1/2 | 1/2-1 | 1-2 | 2-3 | 3-4 | 4-5 | etc. | |Degrees | | | | | | | | +--------------------+-------+-------+-------+--------+--------+---------+------+ +--------------------+-------+-------+-------+--------+--------+---------+------+ | | | | | | | | | | | | | | | | | | |Wind Velocities | | | | | | | | | (miles per hour) | | | | | | | | | | | | | | | | | | | | | | | | | | +--------------------+-------+-------+-------+--------+--------+---------+------+ | Sums | | | | | | | | +--------------------+-------+-------+-------+--------+--------+---------+------+ | Cases | | | | | | | | +--------------------+-------+-------+-------+--------+--------+---------+------+ | Means | | | | | | | | +--------------------+-------+-------+-------+--------+--------+---------+------+ The wind velocity for each station is to be entered in the column at whose top is the rate of pressure change found for that station. Thus, if for any station the rate of pressure change is 3-1/2 (_i.e._, .03 inch in one latitude degree), and the wind velocity at that station is 17 miles an hour, enter the 17 in the fourth and fifth columns of the table. When you find that the rate of pressure change for any station falls into two columns of the table, as, _e.g._, 10, or 5, or 3-1/3, then enter the corresponding wind velocity in both those columns. In the space marked _Sums_ write the sum-total of all the wind velocities in each column. The _Cases_ are the number of separate observations you have in each column. The _Means_ denote the average or mean wind velocities found in each column, and are obtained by dividing the sums by the cases.