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Last modified
7/28/2009 2:35:13 PM
Creation date
4/15/2008 2:38:48 PM
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Weather Modification
Title
Weather Modification Programme - Catalogue of Data Sets for the International Cloud Modelling Workshop/Conference
Date
6/1/1984
Weather Modification - Doc Type
Report
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<br />candidates for storm development. Two storms developed out of this field during <br />the early and mid afternoon. A much larger complex of storms was also forming <br />to the northwest of the CCOPE project area. A strong outflow region developed <br />beneath these storms and began spreading southward. The outflow spread across <br />the CCOPE network late in the afternoon triggering a line of storms which <br />reached from North Dakota southwestward towards Mi 1 es Ci ty. Severe wi nd and <br />hail damage from this line was observed near Glendive, Montana, northeast of <br />Mil es City. <br /> <br />Only three rawinsondes were released during the day from Miles City: 0600,1330, <br />and 1620 MOT. Data from these soundings and from the research aircraft flying <br />near the storms shows the following meteorological conditions: <br /> <br />Subcloud e = 3120 K, <br />q = 11 g/kg, <br />0w - 22.6 oC, <br />LCL temperature = +10 oC, <br />LCL pressure = 700 mb, <br />LI (500) = -7. <br /> <br />NOTE: Large hail falling through the updraft region of the second storm <br />(1530-1720 MDT) damaged QA 3040. It was the last research flight for this <br />ai rcraft. <br /> <br />Two large cumulonimbus clouds were observed. These were very similar in <br />appearance, orientation, and vigor. As with most storms this summer, the new <br />growth zone was not composed of classic feeder cells but some weak, sheared <br />turrets in a flanking line (on the upshear side of the main complex) and rapid <br />vigorous growth of one dominating cell just upwind of the main cell (obscured by <br />anvil or mid-level shelf frequently) which in turn became the main cell. This <br />dominant growth occurred in approximately the same storm-relative position. The <br />first cumulonimbus was just east of the network, while the second was over its <br />center and may be the best Doppler study of the season. Good aircraft coor- <br />dination occurred on the new growth, subcloud, and penetration. Aircraft <br />sustained hail damage. Aircraft penetrations were the most turbulent of the <br />season even though they were through small turrets sprouting near the edge of <br />the dominant cell. <br /> <br />3.2.1.2 Finer resolution <br /> <br />Experiments on finer resolution may be performed on the July 19, 1981 CCOPE case <br />described in section 3.1.1.1.3.A. This case especially is appropriate for stu- <br />dies of internal and external mixing processes, because sailplane data and <br />multiple aircraft penetrations documented the evolution of a cumulus congest us <br />cloud. <br /> <br />3.2.2 Model architecture <br /> <br />The July 19, 1981 CCOPE case is also recommended for studies in these <br />experiments. <br /> <br />Numerical methods, formulation of equations and non-uniform mesh techniques will <br /> <br />21. <br />
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