edu.ucar.opensky::articles:43774 UCAR/NCAR - Library OpenSky Support PO Box 3000 Boulder CO 80307-3000 opensky@ucar.edu http://opensky.ucar.edu/ homepage pointOfContact 2025-12-24T17:48:07.951075 ISO 19115-2 Geographic Information - Metadata - Part 2: Extensions for Imagery and Gridded Data ISO 19115-2:2009(E) https://n2t.net/ark:/85065/d74q80d1 https://doi.org/10.24381/cds.adbb2d47 https Related Dataset #1 ERA5 hourly data on single levels from 1940 to present https://doi.org/10.26023/3NMW-GCXD-600M https Related Dataset #2 Nairobi, Kenya High Resolution BUFR Radiosonde Data. Version 1.0 https://doi.org/10.5281/zenodo.7158583 https Related JournalArticle #1 An observational study of Lake Breeze over the Victoria basin in Uganda Toward improved short-term forecasting for Lake Victoria Basin. Part II: Preconvective environment analysis with ERA5 2025-06-01T00:00:00Z publication https://n2t.net/ark:/85065/d74q80d1 https://doi.org/10.1175/MWR-D-24-0074.1 del Moral Méndez, Anna author Roberts, Rita author Weckwerth, Tammy author Wilson, James W. author UCAR/NCAR - Library publisher Lake Victoria is the largest freshwater lake in Africa, with around 30 million people living on its coastline, and it serves as one of the largest natural resources for East African communities due to its prosperous fishing industry. However, around 1000 fishermen die annually on the lake due to severe weather-related accidents. Radar-based research from the &#8220;High Impact Weather Lake System&#8221; (HIGHWAY) project in 2019 confirmed the marked diurnal cycle on Lake Victoria, studied over decades, where organized, intense convective systems pose a major risk to the fishermen operating overnight. Building upon the results from Part I of this study, we investigate the preconvective environment over the lake for the modes that have been previously identified with a radar-based classification for the two wet seasons in 2019. ERA5 reanalysis data show that in 2019, instability and steeper low-level lapse rates were higher during season I [March&#8211;May (MAM)], allowing unorganized storms overnight to have stronger downdrafts, increasing the potential for strong and damaging winds over the lake. Second, the multicell linear mode in season II [October&#8211;December (OND)] and at nighttime presents significantly low RH 700&#8211;500hPa , which might indicate potential strong winds at the surface (evaporative cooling). Third, bulk shear was higher in season I 2019 for almost all modes, with some modes indicating the capacity to organize into multicell systems and even some to have rotating updrafts. Finally, some modes in season I, at nighttime and early morning, present high storm-relative helicity values in midlevels, which, combined with high bulk shear, may lead to embedded rotations in dynamically complex systems. UCAR/NCAR - Library OpenSky Support PO Box 3000 Boulder CO 80307-3000 opensky@ucar.edu http://opensky.ucar.edu/ homepage pointOfContact PDF Text theme Resource Type 2016-01-01T00:00:00Z publication <span style="font-family:Arial;font-size:10pt;font-style:normal;font-weight:normal;" data-sheets-root="1">Copyright 2025 American Meteorological Society (AMS).</span> None eng geoscientificInformation