Set -ncpu 1 for MPMD wgrib2 calls NOAA-EMC#2206

scripts/exglobal_atmos_products.sh

@@ -111,7 +111,7 @@ for (( nset=1 ; nset <= downset ; nset++ )); do
     fi
 
     # Break tmpfile into processor specific chunks in preparation for MPMD
-    ${WGRIB2} "${tmpfile}" -for "${first}":"${last}" -grib "${tmpfile}_${iproc}"
+    ${WGRIB2} -ncpu 1 "${tmpfile}" -for "${first}":"${last}" -grib "${tmpfile}_${iproc}"
     export err=$?; err_chk
     input_file="${tmpfile}_${iproc}"
     output_file_prefix="pgb2${grp}file_${fhr3}_${iproc}"