"Always," the Forecaster answered, "but, unless I'm mistaken, Ross, you're using the word 'cyclone' in the wrong sense. Most people do. I suppose you think a cyclone is some kind of a whirlwind, a particularly violent storm, eh?"
"Yes, sir," said Ross, "that's what I thought."
"Well, Anton can tell you better than that," the weather expert rejoined. "Tell him what a cyclone is, Anton."
"So far as I can make out," the crippled lad answered, "a cyclone is a whirl in the air, generally from five hundred to a thousand miles across, in the middle of which the barometer is very low, and on the edge of which the barometer rises. It always has winds that blow spirally inwards, those in the United States whirling in a direction opposite to the movement of the hands of a clock.
"So you see, Ross, to the east of a 'low' or ahead of it, the winds are southeasterly, to the north they are northeasterly, to the west, or behind it, they are northwesterly, and to the south, they are southeasterly, all curving into the centre and shifting as the 'low' advances. As these 'lows' travel along the storm track at an average rate of four hundred miles a day, as mountains interfere, and as the shape of a 'low' in America isn't quite round, but looks like a sort of crooked oval, it takes close figuring to find out what the wind is going to do."
"And where does the cold wave come in?" persisted the farmer.
"That comes after the cyclone," explained Anton. "A 'low' means that the pressure of the atmosphere is less than usual, and, consequently, doesn't press the mercury up so far in the barometer. The air weighs less, that shows that it must be expanding. The winds in front blowing into a 'low' are generally warm winds. When a 'low' is traveling fast, with a 'high' or 'anti-cyclone' behind, the colder winds come rushing forward to take the place of the rising warm air and they bring colder weather with them. The freeze comes during the early clearing weather of a 'high,' before the anti-cyclonic winds—which blow in the opposite direction, the way of the hands of a clock—have had a chance to steady down."
"Then," said the farmer shrewdly, "if you get reports of wind and of barometer from points to the west and northwest, you can tell when a cold wave in on the way. Is that it?"
"Exactly," the Forecaster replied. "We cannot always tell, of course, when the weather is going to be a little colder or a little warmer, but a cold wave, serious enough to damage crops and property, can always be foretold. Remember your storm tracks again. In this county, in the State of Mississippi, we are very unlikely to get a freeze, unless there is a rapidly moving 'low' passing up towards the Ohio and St. Lawrence Valleys followed by an equally energetic 'high' plunging down from the Canadian Northwest."
"And can you always tell what the weather is like, all over the country?"