USDA/NASS Disaster Analysis Web Page https://www.nass.usda.gov/Research_and_Science/Disaster-Analysis/index.php Metadata Event: Illinois and Indiana Flooding - August 2026 Last Updated: September 3, 2026 ------------------------------------------------------------------------- Report File Name: 2026_August_IL_IN_Event_report.pdf Description: A prolonged wet period has affected areas of Illinois and Indiana in mid-August 2026. In Indiana, the event began with a derecho and heavy rainfall on August 11, 2026, followed by successive rounds of storms and floods, ending on August 17, 2026. Approximately 300,000 customers lost power. In Illinois, multiple rounds of thunderstorms produced significant flash flooding from August 13-16, 2026. The United States Department of Agriculture's National Agricultural Statistics Service (NASS) produced an assessment on the extent of potential damage to agricultural land and activities 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 imagery coverage to identify likely inundated areas by the flooding event in early August 2026. Inundated areas were then compared to the 2025 Cropland Data Layer (CDL) to estimate crops potentially affected by the floods. -------------------- Assessment Inputs RAPID V2.1 Beta (Real-time Assessment and Prompt Inundation Detection): https://agriwatch.projects.earthengine.app/view/rapid Real-time Assessment and Prompt Inundation Detection (RAPID) was designed for near-real time flood extent mapping and depth estimation using multi-sensor remote sensing data such as ESA Copernicus Sentinel-1 C-band SAR imagery, Sentinel-2, USGS Landsat 8/9, USGS 3DEP National Map Seamless 1/3 Arc-Second DEM, etc. Maximum flood inundation conditions are reflected for specified time windows. The 2025 USDA NASS Crop Data Layer (CDL) is integrated in this app for the use of crop impact assessment. Author: Dr. Zhe Li (zhe.li@usda.gov). Pre-event assessment: July 1 - August 10, 2026 Post-event assessment: August 10 - August 26, 2026 -------------------- Agricultural Inputs Name: NASS 2025 Cropland Data Layer (planted acres) Obtained From: Google Earth Engine Website: https://developers.google.com/earth-engine/datasets/catalog/USDA_NASS_CDL Disclaimer: These data are not official NASS estimates. Acres impacted based on raw pixel counts from the 2025 CDL, which are not official NASS estimates. Therefore, the amount of cropland affected by storm inundation may be different than these estimates indicate. --------------------