HAFS Storm Precipitation and Trajectories, 2020 and 2021

Operational forecast models are necessary for the prediction of weather events in real time. Verification of these models must be performed to assess model skill and areas in need of improvement, particularly with different types of weather events that may occur. Despite the devastating impacts that can be caused by tropical cyclones (TCs) that undergo extratropical transition (ET) and become post-tropical cyclones (PTCs), these storms have not been extensively studied in the context of short-term weather prediction. This study completes the first analysis of the Global Forecast System (GFS) and a pre-operational version of the newly operational Hurricane Analysis and Forecast System (HAFS) models in forecasting the occurrence of ET and the rainfall associated with ET storms in the North Atlantic basin. GFS’s skill exceeds that of HAFS in forecasting the occurrence of ET, but HAFS tends to have lower track and rain rate errors in the fully tropical phase of ET storms’ life cycles. Both ..., This dataset includes the data from HAFS in the manuscript \"Verification of Operational Forecast Models in cases of Extratropical Transition of North Atlantic Hurricanes\" for the analysis of precipitation throughout the entire TC life cycle.
This dataset enables the analysis of precipitation throughout the entire tropical cyclone (TC) life cycle, including points during and after extratropical transition (ET) occurs. The ET process enables TCs to lose their tropical characteristics and be sustained by midlatitude forcing.
The files beginning with \"traj_**********\" are trajectories for the entire TC and PTC life cycle. TCs are first tracked with TempestExtremes, and these files are the TC trajectories extended using ExTraTrack to include all points during and after ET occurs. Further information about the contents of these files can be found here: https://github.com/zarzycki/ExTraTrack. Finally, the netCDF files (beginning in \"masked\" and ending in \".nc\") contain the isolated TC and PTC ..., , # HAFS Storm Precipitation and Trajectories, 2020 and 2021

[https://doi.org/10.5061/dryad.wpzgmsbxw](https://doi.org/10.5061/dryad.wpzgmsbxw)

## Description of the data and file structure

This dataset contains the storm-related rainfall and trajectory files from the HAFS model runs used in the associated manuscript. These files are generated by tracking the TC of interest in each operational simulation, including the extension of the TC trajectory into the post-tropical phase. Rainfall is then tracked using a 1 mm/hr threshold for identifying precipitation objects. The area over which to extract the storm-related rainfall is created by identifying the locations around the storm center where the geopotential height at 500 hPa (Z500) increases by 10 m from the value at the center of the storm (Z500 mask). Finally, the rainfall objects and the Z500 mask are overlaid, thus co-locating rainfall with its respective storm. The TC tracking, precipitation tracking, Z500 mask generation, and c...