Studies of weather types and storms by professors and forecast officials of the Weather bureau . e usually re-quired for a cold wave to advance from Texas to the southAtlantic coast. In January the cold waves of the centraland northern districts attend the passage of the general typeof storms that pass eastward from the north Pacific coast andthe Saskatchewan Valley. As these cold waves drop downfrom the British Northwest Territory in the rear of and im-mediately follow the storms of this type, they assume cor-responding velocities. The average time for a cold wave toadvance from the British N
Studies of weather types and storms by professors and forecast officials of the Weather bureau . e usually re-quired for a cold wave to advance from Texas to the southAtlantic coast. In January the cold waves of the centraland northern districts attend the passage of the general typeof storms that pass eastward from the north Pacific coast andthe Saskatchewan Valley. As these cold waves drop downfrom the British Northwest Territory in the rear of and im-mediately follow the storms of this type, they assume cor-responding velocities. The average time for a cold wave toadvance from the British Northwest Territory to the middleAtlantic and New England States, would, therefore, be sixtyto seventy-two hours. But as the storms vary in velocity, sowould the time required for a cold wave to sweep the north-ern regions vary. In all cases the velocity of cold wavesmust be governed by the velocity of the low areas and of thesucceeding high areas, and their intensity upon the observedtemperature distribution, and the intensity of the low andhigh areas which promote, sustain, and propel a f |1| iiH|imlln I
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