AERMINUTE is the pre-processor program which reads wind data from Automated Surface Observing System (ASOS) stations in the United States and prepares hourly-averaged wind speed and direction values. Up to now, AERMINUTE only read 1-minute data records in a specific format (TD-6405).
The US EPA recently updated the AERMINUTE executable (dated 15272). This update now allows modelers to supplement the record with 5-minute ASOS wind data to fill in gaps in the 1-minute data records. Lakes Environmental has added this AERMINUTE update to the latest release of AERMET View (Version 9.1).
To incorporate 5-minute data into an existing AERMET View project, follow these simple steps:
Step 1: Open your AERMET View project by double-clicking the .amf file
Step 2: Select the ASOS 1-Minute tab from the Surface display. Select the AERMINUTE button to open the AERMINUTE Utility.
Step 3: In the Utility, select the Specify 5-Minute ASOS Wind Data (TD-6401 / DSI-6401) tab. AERMINUTE is now capable of reading 5-minute ASOS wind data in TD-6401 format from the U.S. National Centers for Environmental Information (NCEI, formerly NCDC). AERMET View includes a link to NCDC’s data archive to retrieve the necessary files. Press the Download Files button to open the link to NCDC’s FTP site.
Step 4: Select Load 5-Minute ASOS Files to begin downloading the files needed for your project. Files are named by station callsign, 4-digit year, and 2-digit month. This example uses data from Reno, NV (KRNO) for the full year 2010 (201001 – 201012).
Step 5: AERMINUTE will prepare comparison files for the 1-minute & 5-minute data. These files are enabled by default in the AERMINUTE Utility. Once complete, you can click the Preview icon to view these files and see where the 5-minute data is incorporated.
Step 6: You’re ready to run! Click Process to run AERMINUTE. Once you’re done reviewing the output, click OK to exit the Utility. The file will now indicate that 5-minute data was used.
AERMINUTE produces an hourly data file which is automatically incorporated to your AERMET View project. You can also view a summary file of the hourly averages calculated in the program.