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WSBU31 LBSM 041903

LBSR SIGMET U01 VALID 041903/042030 LBSF-
LBSR SOFIA FIR
SEV TURB OBS AT 1858Z WI N4331 E02239 - N4349 E02246 - N4347 E02305
- N4347 E02329 - N4330 E02329 - N4304 E02327 - N4317 E02255 - N4331
E02239 FL370/400 STNR NC=