Calm hours are identified in the ASCII meteorological data files by a wind speed of 0.0 m/s.  For unformatted PCRAMMET files that are converted to the ASCII format by BINTOASC (see Section C.2), the conversion program checks for calm hours based on the PCRAMMET convention of a wind speed equal to 1.0 m/s and a flow vector equal to the flow vector for the previous hour, and sets the wind speed to 0.0 in the ASCII file.

F.2 PCRAMMET METEOROLOGICAL DATA

     The PCRAMMET preprocessor generates an unformatted file of meteorological data from National Weather Service observations suitable for use by several dispersion models, including the ISCST model.  The file contains two types of records, the first is a header record and the second is the meteorological data.  The second contains the data for one 24‑hour period (midnight to midnight) and is repeated until all data are listed.  The data are written unformatted to the file.  This type of file may also be generated by the MPRM processor designed for processing on‑site meteorological data.

     The format of the header record is:

          READ(u) ID1,IYEAR1,ID2,IYEAR2

                              

                               ╚═ Last 2 digits of beginning year of mixing

                                  height data.

                           

                            ╚═ 5‑digit station identification of mixing

                               height data.

                     

                      ╚═ Last 2 digits of beginning year of hourly

                         surface data.

                  

                   ╚═ 5‑digit station identification of hourly

                      surface data

 

301 - 302 - 303 - 304 - 305 - 306 - 307 - 308 - 309 - 310 - 311 - 312 - 313 - 314 - 315 - 316 - 317 - 318 - 319 - 320 - 321 - 322 - 323 - 324 - 325 - 326 - 327 - 328 - 329 - 330 - 331 - 332 - 333 - 334 - 335 - 336 - 337 - 338 - 339 - 340 - 341 - 342 - 343 - 344 - 345 - 346 - 347 - 348 - 349 - 350

 

 

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