Synergetic Use of the WSR-88D Radars, GOES-R Satellites, and Lightning Networks to Study Microphysical Characteristics of Hurricanes

Journal Article · Mon Jun 01 00:00:00 EDT 2020 · Journal of Applied Meteorology and Climatology

DOI:https://doi.org/10.1175/JAMC-D-19-0122.1· OSTI ID:1631204

Hu, Jiaxi  ^[1]; Rosenfeld, Daniel ^[2]; Ryzhkov, Alexander ^[1]; Zhang, Pengfei ^[1]

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1. Cooperative Institute for Mesoscale Meteorological Studies, University of Oklahoma, and NOAA/OAR, National Severe Storms Laboratory, Norman, Oklahoma
2. Department of Atmospheric Sciences, Hebrew University of Jerusalem, Jerusalem, Israel

This study analyzes the microphysics and precipitation pattern of Hurricanes Harvey (2017) and Florence (2018) in both the eyewall and outer rainband regions. From the retrievals by a satellite red–green–blue scheme, the outer rainbands show a strong convective structure while the inner eyewall has less convective vigor (i.e., weaker upper-level reflectivities and electrification), which may be related to stronger vertical wind shear that hinders fast vertical motions. The WSR-88D column-vertical profiles further confirm that the outer rainband clouds have strong vertical motion and large ice-phase hydrometeor formation aloft, which correlates well with 3D Lightning Mapping Array source counts in height and time. From the results from this study, it is determined that the inner eyewall region is dominated by warm rain, whereas the external rainband region contains intense mixed-phase precipitation. External rainbands are defined here as those that reside outside of the main hurricane circulation, associated with surface tropical storm wind speeds. The synergy of satellite and radar dual-polarization parameters is instrumental in distinguishing between the key microphysical features of intense convective rainbands and the warm-rain-dominated eyewall regions within the hurricanes. Substantial amounts of ice aloft and intense updrafts in the external rainbands are indicative of heavy surface precipitation, which can have important implications for severe weather warnings and quantitative precipitation forecasts. The novel part of this study is to combine ground-based radar measurement with satellite observations to study hurricane microphysical structure from surface to cloud top so as to fill in the gaps between the two observational techniques.

• Sponsoring Organization: USDOE
• Grant/Contract Number: SC0014295; SC0018967
• OSTI ID: 1631204
• Journal Information: Journal of Applied Meteorology and Climatology, Journal Name: Journal of Applied Meteorology and Climatology Vol. 59 Journal Issue: 6; ISSN 1558-8424
• Publisher: American Meteorological Society
• Country of Publication: United States
• Language: English