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<br />o 20 40 6 eo <br />SCALE OF MILES <br />I I <br />III 110 <br /> <br />109 <br /> <br /> <br />Glasgow <br />. <br /> <br /> <br />Havre <br /> <br />11,2 <br /> <br />108 <br /> <br />Figure 2.3.-Isohyetal map for the Warrick, MT storm (0) for period <br />June 6-8, 1906. <br /> <br />away from the Warrick center. With strong northerly winds, the rainfall center <br />at Warrick was at least partially the result of spillover rainfall. The observed <br />rainfall center was on the southward-facing slopes of the mountains. With <br />northerly winds, the orographic influences in this storm could undoubtedly have <br />produced greater rainfall amounts on the northward-facing slope, though the <br />observation network in 1906 was too sparse to confirm this idea. <br /> <br />2.4.1.2 Penrose, Colorado - June 2-6. 1921 (31). The Penrose, CO storm was a <br />very extensive storm occurring in parts of five states. Total duration of the <br />storm was 114 hr taking into consideration rainfall which occurred over an area <br />of approximately 140,000 mi2. It did not rain over the entire area concurrently; <br />rather, there were several rainfall centers located within the five state area. <br />The Penrose center, which was the largest, recorded 12 in. in an 18-hr period <br />beginning about 6:00 p.m. June 3 and ending around noon of June 4. <br /> <br />On June 3, a cold front progressed slowly southeastward across the western <br />United States (fig. 2.4). Meanwhile, a large high pressure area moved generally <br />southward to a position in the vicinity of the Great Lakes. On the morning of <br />June 4, this zone of high pressure became elongated along an east-west axis and <br />dominated the weather and flow pattern from the Great Lakes southward to the Gulf <br />of Mexico. This east-west elongation of the High produced an easterly flow over <br />most of the southern and midwestern United States. At the western edge of the <br />Great Plains, the airflow turned and became southwesterly. This flow brought the <br />moist warm air from the southern United States northwestward. The terrain caused <br />this moist air to be lifted, at first gradually over the higher terrain of <br />western Texas and Oklahoma and then abruptly, by the first upslopes of the Rocky <br />Mountains. It was this moist unstable air that produced the Penrose rainfall <br />center on the evening of June 3 and the morning of June 4. <br /> <br />21 <br />