NCDC data formats into a form required by the MESOPAC

meteorological model. READ56 operates on the older TD-5600

data format. Although this format is not currently used by

NCDC, many historical data sets contain data in this format.

READ62 processes data in the current TD-6201 format.

Although the data inputs are different, the user inputs to

the program are identical as is the processed output file. In

the user input file, the user selects the starting and ending

dates of the data to be extracted and the top pressure level.

Also selected are processing options determining how missing

data are treated. The programs will flag or eliminate sounding

levels with missing data.

If the user selects the option to flag (rather than

eliminate) levels with missing data, the data field of the

missing variables are flagged with a series of nines. If the

option to eliminate levels with missing data is chosen, only

sounding levels with all values valid will be included in the

output data file.

Although MESOPAC allows missing values of wind speed, wind

direction, and temperature at intermediate levels (i.e., levels

other than the surface and model top), the user is cautioned

against using soundings with significant gaps due to missing

data. For example, adequate vertical resolution of the morning

temperature structure near the surface is especially important

to the model for predicting daytime mixing heights. It should

be kept in mind that the model will fill in missing data by

assuming that a straight-line interpolation between valid

levels is appropriate. If this assumption is questionable, the

sounding should not be used with the model.

Two input files are required by the preprocessor: a user

input control file and the NCDC upper air data file. Two

output files are produced: a list file summarizing the user

option selected and missing data monitored and the processed

data file in MESOPAC format. Table A-1 contains a listing of

the input and output files for READ56 and READ62.

The READ56/READ62 control file consists of two lines of

data entered in FORTRAN free format. A description of each

input variable is shown in Table A-2. A sample input file is

shown in Table A-3.

The output data file (UP.DAT) produced by READ56/READ62 is

a formatted file containing the pressure, elevation,

temperature, wind speed, and wind direction at each sounding

level. The contents and format of the UP.DAT file are

discussed in Section A.2.3.




n1301 - n1302 - n1303 - n1304 - n1305 - n1306 - n1307 - n1308 - n1309 - n1310 - n1311 - n1312 - n1313 - n1314 - n1315 - n1316 - n1317 - n1318 - n1319 - n1320 - n1321 - n1322 - n1323 - n1324 - n1325 - n1326 - n1327 - n1328 - n1329 - n1330 - n1331 - n1332 - n1333 - n1334 - n1335 - n1336 - n1337 - n1338 - n1339 - n1340 - n1341 - n1342 - n1343 - n1344 - n1345 - n1346 - n13247 - n1348 - n1349 - n1350


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