UW-Madison AOS 453 - AOS 453 Lecture Notes (15 pages)

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AOS 453 Lecture Notes



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AOS 453 Lecture Notes

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Pages:
15
School:
University of Wisconsin, Madison
Course:
Aos 453 - Mesoscale Meteorology

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The Supercells of April 13th 2006 in Iowa and Wisconsin Brian Miretzky Senior Undergrad at the University of Wisconsin Madison Final Case Study AOS 453 May 9th 2006 Photo taken by Ryan Pfannkuch and Ben McMillan Photo taken by Dr Pao Wang ABSTRACT The night of April 13th 2006 was a very interesting night for many citizens of a certain section of the Midwest The states of Iowa Wisconsin and Illinois were all affected by a severe weather event This event started as convection in west central Iowa and developed into supercells over eastern Iowa The supercells then went separate directions into Wisconsin and Iowa This was a result of mesoscale interaction between the cells and the overall synoptic circulation The mesoscale interaction is very confusing and will be a subject of debate for a long time into the future Overall the storms produced many tornadoes in Iowa and many reports of large hail in Wisconsin Two pictures which represent this event are the placed before the abstract The first picture is of the tornado to hit Iowa City IA area and the second picture is of the hail to hit the Madison WI area Using different tools both the synoptic and mesoscale conditions will be discussed to understand the origins and movement of the supercells 1 Introduction The movement of supercell thunderstorms are never that easy to predict Supercells have their own distinct circulation patterns that lead to their hard to predict movement Sometimes they follow the synoptic flow pattern and sometimes they do not Supercell thunderstorms are most prevalent during the spring and early summer when the temperatures warm and the synoptic flow is still relatively strong There are also many other atmospheric characteristics that are conducive to supercells Some of the characteristics are shear instability moisture and low level convergence All four of these characteristics are present on April 13th 2006 in the evening hours The intent of this case study is to concentrate on the movement of



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