6 July 2023 - Download the new version 2.0.0 of the Antecedent Precipitation Tool (APT)
This new version of the APT contains additional functionalities, to include the incorporation of a newly developed gridded daily precipitation dataset from the National Oceanic and Atmospheric Administration, National Centers for Environmental Information. This new data- the U.S. Climate Gridded Dataset-Daily (nClimGrid-Daily) precipitation dataset- will be useful for instances in which there are not enough suitable weather stations to perform the APT analysis due to poor weather station coverage or instances in which multiple nearby weather stations are missing the same periods of precipitation. This dataset may also be useful when the primary station is further away from the observation point than the dimensions of the grid cell (e.g., if the primary station is 40 miles from the observation point).
USACE is also announcing the release of a new user guide for APT 2.0.0. This publication serves as both a user guide and the technical documentation for the APT, including its inputs, outputs, analyses, common errors, and troubleshooting tips. All users should download the new version of the APT (version 2.0.0) from GitHub at the following location: https://github.com/erdc/Antecedent-Precipitation-Tool/releases/tag/v2.0.0
The changes from version 1.0.23 to version 2.0.0 include:
To report additional issues with the APT, please email firstname.lastname@example.org.
16 March 2023 - Download the new version 1.0.23 of the Antecedent Precipitation Tool (APT)
A recent change to the U.S. Geological Survey (USGS) server housing the elevation data required by the Antecedent Precipitation Tool’s (APT) weather station selection criteria caused the APT to become inoperable. The U.S. Army Corps of Engineers (USACE) has released a new version of the APT which remedies this issue. All users should download the new version of the APT (version 1.0.23) from GitHub at the following location: https://github.com/erdc/Antecedent-Precipitation-Tool/releases/tag/v1.0.23.
This new version includes or incorporates the following:
Additional functionalities, to include the incorporation of gridded precipitation data within the APT, will soon be released with an updated APT user guide. To report additional issues with the APT, please email email@example.com.
February 2022 - Antecedent precipitation Tool (APT) Version 1.0 Technical and User Guide
The Wetlands Regulatory Assistance Program (WRAP) recently published the Technical Note, Antecedent Precipitation Tool (APT) Version 1.0: Technical and User Guide
. This document serves as both a user guide and the technical documentation for the APT, including discussions on its inputs, outputs, and analyses. The Technical Note also provides troubleshooting tips to diagnose and address potential errors associated with the APT. The publication is attached and can also be downloaded from the following link: http://dx.doi.org/10.21079/11681/43160
5 August 2020 - The Corps Antecedent Precipitation Tool (APT) is now available for download from GitHub
The APT is an automation tool that was created by the Corps to rapidly evaluate three climatological parameters, for a given latitude, longitude, and date, to assist in the making and documenting of various determinations required by policy for the execution of U.S. Army Corps of Engineers' Regulatory Program.
The APT is one tool that the Corps may use to determine and document Typical Year conditions (i.e., whether precipitation and other climatic variables are within the normal periodic range (e.g., seasonally, annually) for the geographic area of the applicable aquatic resource based on a rolling thirty-year period).
Instructions for downloading and installing the tool are included on the GitHub page, and are also provided below:
To install the APT you will need to do the following:
- Download the "Antecedent.Precipitation.Tool.7z" file.
- Use 7zip to extract the 'Antecedent Precipitation Tool' folder to your preferred installation location (right-click the folder, choose 7-Zip, and then Extract Files).
- This will extract a folder named “Antecedent.Precipitation.Tool”. This folder IS the program, so put it somewhere out of the way.
- At this point you may delete the 7zip folder. However, the extracted “Antecedent.Precipitation.Tool” folder will need to remain on your PC in order for the APT to function.
- Navigate to the “Antecedent.Precipitation.Tool” folder and Double-click the "Antecedent Precipitation Tool.exe" file. This will run the installer.
- Read/Accept the terms of the User License Agreement.
- A Shortcut will be created on your Desktop and the tool will launch. Use the desktop shortcut (see attached screen shot) any time you want to run the APT.
- Note that the APT is configured to automatically update itself as improved versions are released. Therefore, you will only need to follow this installation process one time, and after that you should use the desktop shortcut any time you want to run the APT.
The Corps is developing additional training materials to support use of the APT, and those materials will generally be released via the APT Help Page. The APT Help Page can be accessed by clicking APT Help Button, which is an orange question mark icon located in the top right portion of the APT user interface.