I'm trying to interpret the Terminal Constraints listed on the Operations Plan Advisory (https://www.fly.faa.gov/adv/adv_spt.jsp). RA seems to be used in the context of weather, but I haven't been able to find a definition for what "RA" means other than "Resolution Advisory" which I don't think is applicable in this context.



-RA is the METAR code for light rain.

LOCIGS is low ceilings, and TSTMS is thunderstorms.*

* Air Traffic Management Glossary of Terms (faa.gov).

  • $\begingroup$ If you can link to a reference that might be helpful for the OP $\endgroup$
    – Pondlife
    May 19 '18 at 1:46
  • 1
    $\begingroup$ In this case, I believe the "-" is just a hyphen to separate the fields, not an indication the rain is light. All the terminal constraints use a hyphen between the airport name(s) and the conditions, e.g. "LAX-RWY 07L/25R CLOSED THROUGH 05/24/18." While -RA is light rain in a METAR/TAF context, this seems like more of an informal usage. $\endgroup$ May 19 '18 at 6:57
  • $\begingroup$ Could be, but I only see the hyphen used in front of those letters. $\endgroup$
    – John K
    May 19 '18 at 19:29
  • $\begingroup$ @ZachLipton No, the hypen means light. A space (or no character) means moderate and a + means heavy. This is defined precisely by ICAO annex 3 appendix 3 chapter 4 (don't remember the exact paragraph). $\endgroup$
    – Jupiter
    Sep 5 '18 at 20:59
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    $\begingroup$ @Jupiter In a METAR, absolutely. But this isn't a METAR; it's an airspace planning document. Look at the current version. It says "MSP/ORD/MDW/CLT/MEM/DFW/DAL/IAH/HOU/DEN-TSTMS" Presumably that's a list of airports, a hyphen, and thunderstorms, not an indication that there are "light thunderstorms" in the vicinity of all of those airports. The next line says "PDX-RWY 1OL/28R CL0SED," and surely there's not a "light runway closure." I don't know for sure, but it doesn't seem like it means light in this context. $\endgroup$ Sep 5 '18 at 22:08

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