Role of Environmental Wind Shear and Helicity in Simulated  Tornadoes
{'Code': '06020102', 'Directorate': {'Abbreviation': 'GEO', 'LongName': 'Directorate For Geosciences'}, 'Division': {'Abbreviation': 'AGS', 'LongName': 'Div Atmospheric & Geospace Sciences'}}
{'SignBlockName': 'Robert W. Taylor', 'PO_EMAI': None, 'PO_PHON': None}
A combined use of a rotating screen at the bottom and an                   exhaust fan at the top of a cylindrical chamber can produce                     tornado-like vortices through the conservation of angular                       momentum.  However, the existence of vertical wind shear in a                   thunderstorm environment can induce horizontal vorticity which                  in turn induces vertical vorticity when tilted by convective                    updrafts.  By replacing the rotating screen with three tiers of                 plexiglass guide vanes, thereby simulating the storm-relative,                  vertically veering winds, the vortex chamber at the University                  of Oklahoma is now capable of simulating vortices by vorticity                  tilting instead of vorticity stretching.  This project will                     allow extensive measurements to be made in the vortex chamber                   and thereby examine the role of environmental wind shear and                    helicity (the dot product of the vorticity vector and velocity                  vector) in the simulated tornadoes.
[{'FirstName': 'Eugene', 'LastName': 'Wilkins', 'PI_MID_INIT': 'M', 'PI_SUFX_NAME': None, 'PI_FULL_NAME': 'Eugene M Wilkins', 'EmailAddress': None, 'NSF_ID': '000371522', 'StartDate': '11/15/1987', 'EndDate': None, 'RoleCode': 'Principal Investigator'}, {'FirstName': 'Douglas', 'LastName': 'Lilly', 'PI_MID_INIT': 'K', 'PI_SUFX_NAME': None, 'PI_FULL_NAME': 'Douglas K Lilly', 'EmailAddress': 'dlilly@ou.edu', 'NSF_ID': '000455681', 'StartDate': '11/15/1987', 'EndDate': None, 'RoleCode': 'Co-Principal Investigator'}]
{'Name': 'University of Oklahoma Norman Campus', 'CityName': 'NORMAN', 'ZipCode': '730193003', 'PhoneNumber': '4053254757', 'StreetAddress': '660 PARRINGTON OVAL RM 301', 'StreetAddress2': None, 'CountryName': 'United States', 'StateName': 'Oklahoma', 'StateCode': 'OK', 'CONGRESSDISTRICT': '04', 'CONGRESS_DISTRICT_ORG': 'OK04', 'ORG_UEI_NUM': 'EVTSTTLCEWS5', 'ORG_LGL_BUS_NAME': 'UNIVERSITY OF OKLAHOMA', 'ORG_PRNT_UEI_NUM': None}
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{'Code': '1522', 'Text': 'PHYSICAL METEOROLOGY'}
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