New Findings on Meteorology Described by Investigators at Pennsylvania State University (The Impact of Vertical Wind Shear on Hail Growth in…

Ecology, Environment & Conservation

New Findings on Meteorology Described by Investigators at Pennsylvania State University (The Impact of Vertical Wind Shear on Hail Growth in Simulated Supercells)

By a News Reporter-Staff News Editor at Ecology, Environment & Conservation -- New research on Meteorology is the subject of a report. According to news reporting out of University Park, Pennsylvania, by VerticalNews editors, research stated, "Severe hailstorms produce over $1 billion in insured losses annually in the United States, yet details of a given storm's hail threat (e.g., maximum hailstone size and total hailfall) remain challenging to forecast. Previous research suggests that, in addition to maximum updraft speed, the storm-relative airflow could be equally important for hail formation and growth."

Financial support for this research came from Insurance Institute for Business and Home Safety.

Our news journalists obtained a quote from the research from Pennsylvania State University, "This study is a first step toward determining how changes in environmental wind shear and subsequent changes in simulated supercell storm structure affect hail growth. Using Cloud Model 1 (CM1) with 500-m horizontal and 250-m vertical grid spacing, 20 idealized simulations are performed in which the thermodynamic profile remains fixed but the environmental hodograph is systematically altered. Hail growth is quantified using the hail mass mixing ratio from composites of storms over the last hour of simulation time. Hailstone growth 'pseudotrajectories'' are computed from these storm composites to determine favorable embryo source regions. Results indicate that increased deep-layer east-west shear elongates the storm's updraft in that direction, providing 1) increased volumes over which microphysically relevant hail processes can act, 2) increased hailstone residence times within the updraft, and 3) a larger potential embryo source region; together, these lead to increased hail mass. Increased low-level north-south shear, which results in hodographs with increased 0-3-km storm-relative helicity, also elongates the updraft in the north-south direction."

According to the news editors, the research concluded: "However, hail mass is reduced owing to a separation of favorable embryo source regions (which shift southward) and available hydrometeors to serve as embryos (which shift northward)."

For more information on this research see: The Impact of Vertical Wind Shear on Hail Growth in Simulated Supercells. Journal of the Atmospheric Sciences, 2017;74(3):641-663. Journal of the Atmospheric Sciences can be contacted at: Amer Meteorological Soc, 45 Beacon St, Boston, MA 02108-3693, USA. (American Meteorological Society - www.ametsoc.org; Journal of the Atmospheric Sciences - www.ametsoc.org/pubs/journals/jas)

Our news journalists report that additional information may be obtained by contacting M.R. Kumjian, Pennsylvania State University, Dept. of Meteorol & Atmospher Sci, University Park, PA 16802, United States.

Keywords for this news article include: University Park, Pennsylvania, United States, North and Central America, Meteorology, Pennsylvania State University.