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roughly toward the top of the picture, withportions of the Great Lakes appearing in t,he upper left.T!Ie intersection point of the center-cross fiducial marklies slightly to the east of Columbus, Ohio.At the time of this photograph, a recent surge of cold airhad invaded the eastern United States. The surface mapfor 1200 GJIT, April 9, showed a high pressure center (1030mb.) loctlt,ecl over Arkansas, 15-ith rrest-to-northr\-estwinds, near freezing t'emperatures, and scattered snowflurries over the

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),beginning near the center of Lake Superior and extendingin narrow parallel rows to the south shore. At that timea deep cyclone (976 mb.) was centered over southwesternQuebec, just east of the pictured area, and Lake Superiorlay beneath a northerly flow of very cold air (middaytemperatures far below freezing). Wisconsin was largelycloud-free but with a heavy snow cover bordering thewestern shore of Lake Michigan. Dense clouds obscureLower Michigan and the eastern shore of Lake Michigan

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David M. Schultz, Derek S. Arndt, David J. Stensrud, and Jay W. Hanna

1. Introduction On the morning of 23 January 2003, an anticyclone with a central pressure of 1048 hPa moved equatorward east of the Rocky Mountains ( Fig. 1 ) bringing the coldest air of the winter south and east. Several stations set record cold low temperatures for the day [−31.1°C (−24°F) at Huron, South Dakota, and −22.8°C (−9°F) at Kansas City, Missouri]; others set record cold high temperatures for the day [−11.1°C (12°F) at Paducah, Kentucky, and −6.1°C (21°F) at Huntsville, Alabama

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