Fig. 3: Comparison of precipitation forecasts from NowcastNet and HRRR for the Waverly flood event (August 21, 2021): spatial accuracy and power spectral density analysis.
From: Hybrid physics-AI outperforms numerical weather prediction for extreme precipitation nowcasting
Precipitation forecasts (in mm/h) from NowcastNet (1 km spatial resolution) and HRRR (3 km spatial resolution) at different lead times (T + 1 h, T + 2 h, and T + 3 h) with MRMS QPE32 for the Waverly flood event on August 21, 2021 (T = 8:00 UTC) within the TVA area. The precipitation images cover a spatial extent of 384 km × 384 km. The base map shows US state boundaries. NowcastNet predicts the MRMS precipitation patterns more closely than HRRR does, in terms of the spatial distribution and intensity of the precipitation. The last row depicts the PSD at different wavelengths, at different lead times (T + 1 h, T + 2 h, and T + 3 h).
