Do you have a copy of Aviation Weather Services, AC 00-45E? DZ is drizzle,
E means ended, B means began, RA means rain,. UP is not included in the
list of abbreviations and acronyms, but whatever it is, it began at 47 and
ended at 49....hardly long enough to note if it is a weather phenomenon
(UPD means updraft, but that is weird in a METAR context). The AC is well
worth adding to your library, because it has three full pages of URLs for
weather info, etc.

UP is unknown precipitation.

Actually yes to AC 00-45E, but it's inaccessible at another house. I
figured DZ was drizzle and RAB was "rain began" but forgot what E was,
and then UP.

Thanks.