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Seven-Doppler Radar and In Situ Analysis of the 25–26 June 2015 Kansas MCS during PECAN
  • Published Date:
    2020
  • Source:
    Mon. Wea. Rev. (2020) 148 (1): 211–240.
Filetype[PDF-10.51 MB]


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Seven-Doppler Radar and In Situ Analysis of the 25–26 June 2015 Kansas MCS during PECAN
Details:
  • Personal Author:
  • Description:
    This case study analyzes a nocturnal mesoscale convective system (MCS) that was observed on 25–26 June 2015 in northeastern Kansas during the Plains Elevated Convection At Night (PECAN) project. Over the course of the observational period, a broken line of elevated nocturnal convective cells initiated around 0230 UTC on the cool side of a stationary front and subsequently merged to form a quasi-linear MCS that later developed strong, surface-based outflow and a trailing stratiform region. This study combines radar observations with mobile and fixed mesonet and sounding data taken during PECAN to analyze the kinematics and thermodynamics of the MCS from 0300 to 0630 UTC. This study is unique in that 38 consecutive multi-Doppler wind analyses are examined over the 3.5 h observation period, facilitating a long-duration analysis of the kinematic evolution of the nocturnal MCS. Radar analyses reveal that the initial convective cells and linear MCS are elevated and sustained by an elevated residual layer formed via weak ascent over the stationary front. During upscale growth, individual convective cells develop storm-scale cold pools due to pockets of descending rear-to-front flow that are measured by mobile mesonets. By 0500 UTC, kinematic analysis and mesonet observations show that the MCS has a surface-based cold pool and that convective line updrafts are ingesting parcels from below the stable layer. In this environment, the elevated system has become surface based since the cold pool lifting is sufficient for surface-based parcels to overcome the CIN associated with the frontal stable layer.
  • Keywords:
  • DOI:
    https://doi.org/10.1175/MWR-D-19-0151.1
  • Document Type:
    Journal Article
  • Funding:
    Grant no. NA11OAR4320072
  • Place as Subject:
    Kansas
  • Collection(s):
    NOAA Cooperative Institutes
    Office of Oceanic and Atmospheric Research (OAR)
  • Main Document Checksum:
  • Supporting Files:
    No Additional Files
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