. The climate and weather of Baltimore . and extensive areasof high pressure, or anti-cyclones, shown upon the chart: One coveredthe eastern section of the country, comprising all of the Atlantic coaststates, with the maximum barometer over Nova Scotia; the other spreadover most of the country west of the Mississippi Eiver, with the centerto the north of Montana. Between these two vast anti-cyclones, therewas a narrow trough of relatively low pressure, extending from the UpperLake region to the Gulf of Mexico. In advance of this trough of lowpressure, or elongated cyclonic depression, the temp
. The climate and weather of Baltimore . and extensive areasof high pressure, or anti-cyclones, shown upon the chart: One coveredthe eastern section of the country, comprising all of the Atlantic coaststates, with the maximum barometer over Nova Scotia; the other spreadover most of the country west of the Mississippi Eiver, with the centerto the north of Montana. Between these two vast anti-cyclones, therewas a narrow trough of relatively low pressure, extending from the UpperLake region to the Gulf of Mexico. In advance of this trough of lowpressure, or elongated cyclonic depression, the temperatures rose rapidlyunder the influence of strong southerly winds. To westward of thetrough the cold northwest winds blowing out of the well developed anti-cyclone brought freezing weather far down into the southern states. Thewestern anti-cyclone moved southeastward as a great wave of cold air,closely following the cyclonic depression, causing a very steep gradient ^ See page 128 for details of cold waves. MARYLAND WEATHER SERVICE 393. Fig. 139.—Cold Wave of December 13, 1901.
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