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Hi Pam- Good seeing you again at the storm conference. Please send my congrats to the club for an excellent conference. I wanted to follow up on the problem you were having plotting isallobars. I tried the following: SP PSL-PSL USA 12-9 and got: --MDX-- NO DATA FOUND..CHECK MAP & SORT SPECS LAT= 21.0000 58.0000 LON= 64.0000 128.0000 TIME 9. DAY 73. TYPE 0. However, if I used the DAY= keyword: SP PSL-PSL USA 12-9 DAY=2000073 it worked: ---PLOTTING DONE I tried this again using SPC without the day: SPC PSL-PSL USA 12-9 and it worked: ---PLOTTING DONE The "problem" is that SP was sunset by SSEC and we do not make any modifications to it. When the SCHEMA changed and the date format changed, SP couldn't handle it. Our program (SPC) is a suped up version of SP and does account for the new SCHEMA. So, until SFCPLOT and SFCCON can do math (ie: subtraction), you should use SPC and SCC, but not SP and SC. If none of these cases explains the problem you are seeing, send a note back to support with the exact command syntax that is not working. Here is the URL for the list of upcoming sunset commands: http://www.unidata.ucar.edu/packages/mcidas/mcx/sunset.html If you are using any of these commands to be sunset, you should switch to using the alternative supporting commands listed. Don ************************************************************* Don Murray UCAR Unidata Program address@hidden P.O. Box 3000 (303) 497-8628 Boulder, CO 80307 ************************************************************* Unidata WWW Server http://www.unidata.ucar.edu/ McIDAS Demonstration Machine http://mcdemo.unidata.ucar.edu/ *************************************************************