edu.ucar.opensky::technotes:67 UCAR/NCAR - Library OpenSky Support PO Box 3000 Boulder CO 80307-3000 opensky@ucar.edu http://opensky.ucar.edu/ homepage pointOfContact 2025-12-26T17:39:39.347272 ISO 19115-2 Geographic Information - Metadata - Part 2: Extensions for Imagery and Gridded Data ISO 19115-2:2009(E) https://n2t.org/ark:/85065/d7k073p8 The National Hail Research Experiment Report on the Alberta Hail Project 1976-01-01T00:00:00Z publication https://n2t.org/ark:/85065/d7k073p8 https://doi.org/10.5065/D64Q7RX8 Simpson, J. author UCAR/NCAR - Library publisher The Alberta Hail Project conducts airborne silver iodide seeding to test hail suppression in an 1800 square mile target which experiences 55-65 hail days annually. Randomization by days occurs in the northern half of the target, with the exception of some south-moving storms. Full operational seeding is conducted in the southern half. Seeding on top (at about -14C) with droppable flares and at cloud base with fusees is executed by a maximum of seven aircraft, one of which is instrumented for cloud physics. The seed criterion is an echo intensity of 35 dBZ in or approaching the target. Present findings suggest (from radar and photography) a gradual transition between multicell and supercell storms. Tracer results suggest on top seeding may be more effective in silver iodide distribution in the storm. 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 Hail storms Precipitating convective cloud systems Hail theme U.S. National Aeronautics and Space Administration Global Change Master Directory GCMD 2021-09-17 revision 11.2 NASA Global Change Master Directory originator Valids List: Science and Services Keywords Copyright Author(s). This work is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License. None eng geoscientificInformation