Seasonal & 30-day Gridded Forecast Dataset Documentation Files in each annual archive are tar'd, then compressed to save space; once unpacked the files consist of ASCII (plain DOS text) files, each containing one grid per category per forecast (thus, for any given forecast there are 6 files, 3 forecasts of temperature probabilities and 3 of precipitation forecasts). Currently, April 2007, only the 30day forecasts have been redigitized and stored for most of the forecasts, some later years have full sets of 14 leads for each forecast. 30-day forecasts are designated lead 14 for convenience. TABV -- Forecast of probability of Above normal temperature TNRM -- Forecast of probability of Near normal temperature TBLW -- Forecast of probability of Below normal temperature PABV -- Forecast of probability of Above normal precipitation PNRM -- Forecast of probability of Near normal precipitation PBLW -- Forecast of probability of Below normal precipitation file names are of the form [parm].[lead].out where parm is one of the forecast types above, and lead is the lead number [1-14] where lead 14 is the 30-day forecast Typical header information in each file ------ TIME -- the target date of the 30-day forecast / lead number PARM -- the forecast parameter (see above) AREA -- geographical area covered, lower left corner to upper right awna is predefined as 8;-135.5;37.7;-19.25 GRID SIZE -- the number of rows & columns in the source grid overall COLUMNS -- the column number as defined by the longitude ROWS -- the row number as defined by the latitude so, this grid (and all the 30-day grids) begin at 8N,135.5W or row 8, col 219 and ends at 37.7N, 19.25W or row 37, col 342 Grid file: ../archives/1995/02/output.199502.out.grd GRID IDENTIFIER: TIME1 TIME2 LEVL1 LEVL2 VCORD PARM 950215/1400 0 NONE TABV AREA: awna GRID SIZE: 360 91 COLUMNS: 219 342 ROWS: 8 37 Scale factor: 10** 0 COLUMN: 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 ROW 37 33.33 33.33 33.33 33.33 33.33 33.33 33.33 33.33 33.33 33.33 33.33 33.33 35.48 37.72 39.46 41.11 42.91 45.43 46.34 47.75 45.48 41.12 38.00 35.00