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10-Year Warm-Season Doppler Radar Climatology of Horizontal Convective Rolls and Cellular Convection in Central Oklahoma
Identification_Information:
Citation:
Citation_Information:
Originator:The Pennsylvania State University
Publication_Date:2019
Title:
10-Year Warm-Season Doppler Radar Climatology of Horizontal Convective Rolls and Cellular Convection in Central Oklahoma
Other_Citation_Details:
David J. Stensrud and Matthew R. Kumjian, Principal Investigators, Department of Meteorology and Atmospheric Science, The Pennsylvania State University John R. Banghoff, Masters of Science Graduate Student Jacob D. Sorber, Undergraduate Researcher
Online_Linkage: http://www.datacommons.psu.edu/
Description:
Abstract: 
Horizontal convective rolls (HCRs) and cellular convection (cells) are observed frequently within the convective boundary layer, yet a large data base of HCR and cell events spanning several years has not been previously available to researchers.  This data set corrects this gap.  Daily information on HCRs and cells from the warm season (April-September) months of 2008 to 2017 have been created over central Oklahoma and are provided in an easy to use Excel spreadsheet.  Doppler radar observations from the Twin Lakes (KTLX), Oklahoma, WSR-88D are used to determine the start and end times of HCRs and cells for each day during these 10 years.  The start and end times were determined by visual inspection of animated loops of a 1.4 degree elevation angle plan position indicator (PPI) display of radar reflectivity observations between 1200 and 0000 UTC each day.  Even in clear air conditions, WSR-88D observations are available roughly every 10 min, providing high temporal sampling of the atmosphere near the radar.  There are 1830 days during this 10-year warm-season period and KTLX observations are available on 1807 days.  Of these 1807 days, HCRs and/or cells are observed on 1382 days as discussed in Banghoff et al. (2020), with the majority of the days without HCRs and/or cells being days with precipitation.  In addition to the start and end times of HCRs and cells, and their transitions, KTLX observations from 2013-2017 are used to determine HCR and cell wavelengths and aspect ratios and HCR orientation angles.  Only data from 2013 onward are used for these more detailed analyses owing to the availability of dual-polarization observations starting in 2013 which allow for the estimation of convective boundary layer depth (see Banghoff et al. 2018).  An analysis of these data is presented in Banghoff et al. (2020) that includes a careful analysis of the frequency of HCRs and cells, their duration, wavelengths, aspect ratios, and HCR orientation angles.  These results are compared to those from earlier studies to set the 10-year climatology into context.  With such a lengthy and rich data set, we expect that others will benefit from the daily information on HCRs and cells created as part of our research studies.
Purpose: 
Data in the spreadsheet are organized by year. Days from 1 April through 30 September are shown by row, with columns for start and end times for HCRs (rolls) and Cells. Tabs indicate the different years (2008 – 2017). Times of transition from HCRs to cells or vice versa also are indicated. All times are UTC. NaN means not observed. Wavelength, orientation and aspect ratio information only for years 2013-2017. Wavelength and convective boundary layer (CBL) depth in units of km. Orientation angle in standard degrees from north, so 180 degrees means winds are from due south. VAD is the Velocity Azimuth Display approach that uses Doppler radial velocity observations to calculate the mean wind at a selected distance from the radar. Orientation departure is VAD wind orientation minus the HCR orientation, providing information on how close the HCRs are aligned with the mean CBL wind.
Supplemental_Information: 
Banghoff, J. R., D. J. Stensrud, and M. R. Kumjian, 2018: Convective boundary layer depth estimation from S-band dual-polarization radar. J. Atmos. Oceanic Technol., 35, 1723–1733, https://doi.org/10.1175/JTECH-D-17-0210.1
Banghoff, J. R., J. D. Sorber, D. J. Stensrud, G. S. Young, and M. R. Kumjian, 2020: A 10-year warm-season climatology of horizontal convective rolls and cellular convection in central Oklahoma. Mon. Wea. Rev., 148, 21–42, https://doi.org/10.1175/MWR-D-19-0136.1
Time_Period_of_Content:
Time_Period_Information:
Single_Date/Time:
Calendar_Date:2017
Currentness_Reference: 
publication date
Keywords:
Theme:
Theme_Keyword_Thesaurus:ISO 19115 Topic Categories
Theme_Keyword:Horizontal convective rolls
Theme_Keyword:Cellular convection
Theme_Keyword:Climatology
Theme_Keyword:Convective boundary layer
Theme_Keyword:climatologyMeteorologyAtmosphere
Place:
Access_Constraints:None.
Use_Constraints: 
The University excludes any and all implied warranties, including warranties or merchantability and fitness for a particular purpose.
The University makes no warranty or representation, either express or implied, with respect to the FILES or accompanying documentation, including its quality, performance, merchantability, or fitness for a particular purpose. The FILES and documentation are provided "as is" and the USER assumes the entire risk as to its quality and performance.
The University will not be liable for any direct, indirect, special, incidental, or consequential damages arising out of the use or inability to use the FILES or any accompanying documentation.
The USER is granted permission to translate and add value to the FILES for the use of the FILES on its computer hardware; provided, however, that the USER annually notify the University of any customizing or value-adding work done.
Point_of_Contact:
Contact_Information:
Contact_Person_Primary:
Contact_Person:David J. Stensrud
Contact_Organization:Penn State
Contact_Position:Department of Meteorology and Atmospheric Science
Contact_Address:
Address_Type:mailing address
Address: 
503 Walker Building
City:University Park
State_or_Province:Pennsylvania
Postal_Code:16802
Country:USA
Contact_Electronic_Mail_Address:david.stensrud@psu.edu
Native_Data_Set_Environment:
Microsoft Windows 2000 Version 5.0 (Build 2195) Service Pack 4; ESRI ArcCatalog 8.3.0.800
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Distribution_Information:
Distributor:
Contact_Information:
Contact_Person_Primary:
Contact_Organization:Penn State Data Commons
Contact_Address:
Address_Type:mailing and physical address
Address: 
115 Land and Water Building
City:University Park
State_or_Province:Pennsylvania
Postal_Code:16802
Country:United States
Contact_Voice_Telephone:(814) 865 - 8792
Contact_Electronic_Mail_Address:datacommons@psu.edu
Distribution_Liability: 
The USER shall indemnify, save harmless, and, if requested, defend those parties involved with the development and distribution of this data, their officers, agents, and employees from and against any suits, claims, or actions for injury, death, or property damage arising out of the use of or any defect in the FILES or any accompanying documentation. Those parties involved with the development and distribution excluded any and all implied warranties, including warranties or merchantability and fitness for a particular purpose and makes no warranty or representation, either express or implied, with respect to the FILES or accompanying documentation, including its quality, performance, merchantability, or fitness for a particular purpose. The FILES and documentation are provided "as is" and the USER assumes the entire risk as to its quality and performance. Those parties involved with the development and distribution of this data will not be liable for any direct, indirect, special, incidental, or consequential damages arising out of the use or inability to use the FILES or any accompanying documentation.
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Metadata_Reference_Information:
Metadata_Contact:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization:Penn State Data Commons
Contact_Position:Metadata Coordinator
Contact_Address:
Address_Type:mailing address
Address: 
115 Land and Water Building
City:University Park
State_or_Province:Pennsylvania
Postal_Code:16802
Country:United States
Contact_Voice_Telephone:814-865-8792
Contact_Electronic_Mail_Address:datacommons@psu.edu
Metadata_Standard_Name:FGDC Content Standards for Digital Geospatial Metadata
Metadata_Standard_Version:FGDC-STD-001-1998
Metadata_Time_Convention:local time
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