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Meteorological Processors and Accessory Programs

Surface and upper air data, provided by NWS, are important inputs for air quality models. Before these data are used in some of the EPA dispersion models, meteorological processors are used to manipulate the data. Some of these processors re-format data for input into air quality dispersion models, while other processors use the NWS observational data to calculate important inputs for the dispersion models. These processors include: AERMET, Mixing Height Program, MPRM, PCRAMMET, and STAR. Other accessory programs are also provided that produce graphical or statistical outputs that can aid in the interpretation and understanding of the NWS data or dispersion model results. These accessory programs include: BINTOASC, METLIST, WINDROSE, WRPLOT.

Meteorological Processors
AERMET - Version 15181
AERMET is a meteorological data preprocessor for AERMOD. AERMET processes commercially available or custom on-site met data and creates two files: a surface data file and a profile data file. The tool AERSURFACE can be used to estimate the surface characteristics for input to AERMET.

Model Code
Executable (v15181) (ZIP, 845KB)
Source Code (v15181) (ZIP, 458KB)

Model Documentation
User's Guide Addendum (v15181) (ZIP, 2.0MB)

Model Change Bulletin #6 - Version Date 15181 (PDF, 35KB)
Model Change Bulletin #5 - Version Date 14134 (PDF, 32KB)
Model Change Bulletin #4 - Version Date 13350 (TXT, 8KB)
Model Change Bulletin #3 - Version Date 12345 (TXT, 7KB)
Model Change Bulletin #2 - Version Date 11059 (TXT, 11KB)
Model Change Bulletin #1 - Version Date 06341 (TXT, 8KB)

March 8, 2013 Clarification Memorandum - Use of ASOS Meteorological Data in AERMOD Dispersion Modeling (PDF, 1.3MB)

Test Cases
Test Cases README (TXT, 1KB)
Test Cases (ZIP, 173.4MB)

FIXISHD Utility Program (This is no longer needed.)

AERMINUTE - Version 14337
AERMINUTE processes 1-minute ASOS wind data to generate hourly average winds for input to AERMET in Stage 2.

Code, Executable, and User's Guide
Model Change Bulletin #3 - Version Date 14337 (TXT, 1KB)
Model Change Bulletin #2 - Version Date 14237 (TXT, 2KB)
Model Change Bulletin #1 - Version Date 11325 (TXT, 1KB)

Mixing Height Program
A program which calculates twice daily mixing heights for use in PCRAMMET. This program requires surface and radiosonde files as inputs.

Model Code
Executable (130KB,ZIP - Readme included)
Source Code (19KB,ZIP)

Model Documentation
Test Case  (827KB,ZIP)
User's Guide (11KB,ZIP)
Latest Model Change Bulletin (txt file)
MPRM (Meteorological Processor for Regulatory Models)
A program used to process meteorological data, both National Weather Service and on-site, for use in regulatory modeling.  MPRM has 3 stages: (1) listing missing, suspect , and invalid data, (2) merging quality assured and corrected meteorological data, and (3) creating meteorological data files for input to air quality dispersion models. It contains the PCRAMMET program.

Model Code
MPRM Executable (244KB,ZIP) (Revised 6/24/99)
Executable for data extraction and quality assurance (265KB,ZIP)
Source Code (200KB,ZIP) (Revised 6/24/99)

Model Documentation
README (5KB,TXT) (Revised 6/24/99)
Test Case (197KB,ZIP) (Revised 6/24/99)
User's Guide (272KB,ZIP)
Addendum to User's Guide
Latest Model Change Bulletin (text file)
A meteorological processor which combines hourly NWS surface and twice daily mixing heights into a single file, computes a mixing height for each hour. PCRAMMET also incorporates surface characteristic parameters (Monin-Obukhov length, surface roughtness length, albedo, Bowen ratio, anthropogenic heat flux, and net radiation) for deposition modeling. Output from PCRAMMET is commonly used as input to ISCST3 and BLP. PCRAMMET is a PC version of the original RAMMET program.

Model Code
Executable (160KB,ZIP - with readme)
Source Code (52KB.ZIP)

Model Documentation
User's Guide
Latest Model Change Bulletin (text file)

Test Cases Using Different Input Data Formats:
PCREX1 - CD144/TD3240 fixed format example (323KB,ZIP)
PCREX2 - SAMSON example (291KB,ZIP)
PCREX3 - SCRAM example (174KB,ZIP)
PCREX4 - CD144/TD3240 variable format example (322KB,ZIP)
PCREX5 - HUSWO data (320KB,ZIP)

PCRAMMET Demonstration (362K,ZIP)
PCRAMMET Program  (166K,ZIP)
Tutorial Documentation (27K,ZIP)
Instructions on PCRAMMET tutorial  (text file)
STAR (STability ARray program)
This program calculates a frequency distribution for wind speed, wind direction and wind stability.  The output is an array suitable for input to ISCLT3.

Model Code and Documentation
Executable, Source Code and Test Case (216KB,ZIP - Readme included)
Latest Model Change Bulletin (text file)

Accessory Programs
A program that converts meteorological data from binary format to ASCII format. It is used primarily to give convert meteorological data when using the deposition option in the ISCST3 model (and is located with the model).
This program creates a listing file of specified meteorological data for a specified day or range of days, for QC or other purposes of inspection of a meteorological dataset. This program is used with the ISC3 model (and is located with the model).
A program that produces wind frequency statistics for 16 directions (22.5 degree arcs) to generate a graphical wind rose for each wind sector. The program uses the TD-1440 meteorological data (raw SCRAM format) as input.

Model Code and Documentation
Executable and Test files (285KB,ZIP)
Latest Model Change Bulletin (text file)
A program which computes wind rose statistics based on 10 degree wind increments. Unlike WINDROSE, WRPLOT can provide a graphical plot. Windrose uses the TD-1440 SCRAM meteorological data as input.

Model Code
Executable and test data (1087KB,ZIP)

Model Documentation
Tutorial - Documentation, test data and readme. 
WRPLOT Demonstration (1084K,ZIP)
Tutorial Documentation (48K,ZIP)
Instructions for WRPLOT Tutorial (2K,TXT)
Latest Model Change Bulletin (text file)

Test Data Sets
1984 Meteorological Data for RDU, NC (71K,ZIP)
1998 Meteorological Data for RDU, NC (70K,ZIP)
1986 Meteorological Data for RDU, NC (71K,ZIP)
1987 Meteorological Data for RDU, NC (70K,ZIP)
1988 Meteorological Data for RDU, NC (71K,ZIP)
1989 Meteorological Data for RDU, NC (71K,ZIP)


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