Noah Brauer - April 15

Weather and Climate Seminar The Inland Maintenance and Re-intensification of Tropical Storm Bill: Tropical Precipitation Microphysics   Noah Brauer Wednesday, April 15th 3:00pm Central Time (US and Canada)/Zoom Meeting Join Zoom Meeting https://oklahoma.zoom.us/j/505651584 Meeting ID: 505 651 584 Zoom Password: 996546   Tropical Storm Bill produced over 400 mm of rainfall

Start

April 15, 2020 - 3:00 pm

End

April 15, 2020 - 4:00 pm

Weather and Climate Seminar

The Inland Maintenance and Re-intensification of Tropical Storm Bill: Tropical Precipitation Microphysics

 

Noah Brauer

Wednesday, April 15th

3:00pm Central Time (US and Canada)/Zoom Meeting

Join Zoom Meeting
https://oklahoma.zoom.us/j/505651584

Meeting ID: 505 651 584

Zoom Password: 996546

 

Tropical Storm Bill produced over 400 mm of rainfall to portions of southern Oklahoma from 16-20 June 2015 which resulted in catastrophic urban and river flooding. Prior to this event, unprecedented excessive precipitation that occurred across Oklahoma and Texas during May and June 2015 resulted in anomalously high soil moisture and latent heat fluxes over the region, acting to increase the available boundary layer moisture. Tropical Storm Bill progressed inland displaying polarimetric radar signatures associated with tropical, warm rain events. Vertical profiles of polarimetric radar variables such as ZH, ZDR, KDP, and rhv were analyzed along the track of the storm over Texas, southern Oklahoma, Missouri, and southern Illinois. The profiles suggest that Tropical Storm Bill maintained warm rain features and specifically collision-coalescence process signatures in the liquid phase as it tracked hundreds of kilometers inland away from the landfall point. Ground-based radar data were complemented with spaceborne radar observations with vertical profiles of Ku-band reflectivity, mass-weighted mean drop diameter, and drop number concentration from the NASA Global Precipitation Measurement Mission (GPM) Dual Frequency Precipitation Radar (DPR). These high-resolution profiles were analyzed during the periods of tropical cyclone maintenance and reintensification and showed similar signatures of collision-coalescence and/or drop breakup while Bill moved progressed inland.

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