USDA/NASS Disaster Analysis Web Page https://www.nass.usda.gov/Research_and_Science/Disaster-Analysis/index.php Metadata Event: Hurricane Helene - September 2024 Last Updated: October 8, 2024 ------------------------------------------------------------------------- Report File Name: Hurricane_Helene_2024_Oct08.pdf Hurricane Helene was a large, deadly catastrophic hurricane, which caused high storm surge, hurricane-force wind gusts, and rainfall-triggered flooding across the Southeastern U.S. in late September 2024. The storm made landfall in Florida on September 26, 2024 as a Category 4 hurricane. It degenerated to a post-tropical cyclone on September 27, 2024 over Tennessee. The United States Department of Agriculture's National Agricultural Statistics Service (NASS) produced an assessment on the extent of potential damage to agricultural land from this event. A disaster assessment was conducted using available Sentinel-1 Synthetic Aperture Radar (SAR) and cloud-free Sentinel-2 and Landsat 8/9 optical imagery coverage to identify inundated areas due to Hurricane Helene. Inundated areas were then compared to the 2023 Cropland Data Layer (CDL) to estimate crops potentially affected by the floods. Additional wind and precipitation analysis were conducted using the 2023 CDL. -------------------- Imagery Inputs Name: Sentinel-1 Synthetic Aperture Radar (SAR) Dates: 08/26/24 to 10/05/24 Obtained From: https://developers.google.com/earth-engine/datasets/catalog/COPERNICUS_S1_GRD Name: Sentinel-2 Multi-Spectral Instrucment (MSI) Median Composite Image Dates: 08/26/24 to 10/05/24 Obtained From: https://developers.google.com/earth-engine/datasets/catalog/COPERNICUS_S2_SR -------------------- Weather Inputs Name: NOAA National Hurricane Center, Preliminary Best Track downloaded on October 3, 2024. Obtained From: https://www.nhc.noaa.gov/gis/ Name: NOAA National Water Prediction Service, Precipitation Estimate Last 10 Days downloaded on October 4, 2024. Obtained From: https://water.noaa.gov/ -------------------- Agricultural Inputs Name: NASS 2023 Cropland Data Layer (planted acres) Obtained From: https://developers.google.com/earth-engine/datasets/catalog/USDA_NASS_CDL Disclaimer: These data are not official NASS estimates. -------------------- Processing Software Google Earth Engine - https://zheli.users.earthengine.app/view/flood-detection-and-monitoring-system-v19-hurricane-helen-2024 --------------------