Was this interference?

The usual, garden variety connection problem: was on a site, then couldn't move around within, saw the Transmit Rate had dropped to 1, then lost the Airport icon, i.e. dimmed completely. Got message, "None of your preferred networks are available." I saw that my Network wasn't on the list in the dropdown any longer. Then it appeared, but couldn't connect; kept getting "Connection timed out." I was eventually able to get back on, which I assumed was due to the interference subsiding.
Here's the question: I was assuming this was from interference, but was it? And, if so, is this the way it behaves? Opened up AirRadar, where I saw that the raw value for Noise was -88 and the Signal was also -88. OK, Noise was completely canceling out the Signal; that explains it. However, what I don't understand was with massive interference, I would have expected the noise to be much stronger than the signal. +I usually get Noise around -88 when I am not having any problems,+ while my usual signal is ~ -60 to -70. I was expecting to see my signal still at roughly the same strength, but the Noise or interference to be much stronger than the usual -88.
So, the effect of strong interference is to reduce the signal? And, a further question: if it was interference, and if the interference was not located on one channel, i.e. spectrum wide. across all channels (e.g. originating from a microwave oven, or something similar which would radiate everywhere) -- which I have been supposing it generally is -- why was I still able to see the other Networks, including the one right next door to the channel I'm on?

Tesserax, thanks very much for all the information.
Finally, it is also possible that the Signal drops may be due to a failing radio transmitter in your AirPort and not necessarily due to the presence of Noise.
"Failing radio transmitter in your AirPort." Did you mean the AirPort Card, the Router, or both? Any way to know if it's the Card acting up? If you wouldn't mind, here is the log from this episode. Would any of these be Card related, or is this just generic stuff from not being able to connect? (You may see that I tried turning AirPort off and on several times.) I know there's a lot of repetition of the same errors while I was trying to connect, but I was afraid to edit this down in case I might, by accident, remove something important. Thanks again.
Mar 11 06:16:27 Macintosh-3 kernel[0]: AirPort: Link Down on en1
Mar 11 06:16:27 Macintosh-3 airportd[116]: AirPort off, bailing - GetPower() = off (0)
Mar 11 06:16:30 Macintosh-3 configd[36]: setting hostname to "Macintosh-3.local"
Mar 11 06:16:33 Macintosh-3 airportd[116]: Error: Apple80211Associate() failed -6
Mar 11 06:17:03: --- last message repeated 1 time ---
Mar 11 06:17:04 Macintosh-3 airportd[116]: Error: Apple80211Associate() failed -6
Mar 11 06:17:04 Macintosh-3 airportd[116]: Error: processcommanddict() failed
Mar 11 06:17:04 Macintosh-3 SystemUIServer[98]: Error: airportd MIG failed = -6 ((null)) (port = 66187)
Mar 11 06:17:11 Macintosh-3 airportd[116]: Error: Apple80211Associate() failed -6
Mar 11 06:17:11 Macintosh-3 SystemUIServer[98]: Error: airportd MIG failed = -6 ((null)) (port = 66187)
Mar 11 06:17:11 Macintosh-3 airportd[116]: Error: processcommanddict() failed
Mar 11 06:17:11 Macintosh-3 SystemUIServer[98]: Error joining *****: Connection timeout (-6 timeout connecting)
Mar 11 06:17:27 Macintosh-3 airportd[116]: Error: Apple80211Associate() failed -6
Mar 11 06:17:27 Macintosh-3 SystemUIServer[98]: Error: airportd MIG failed = -6 ((null)) (port = 66187)
Mar 11 06:17:27 Macintosh-3 SystemUIServer[98]: Error joining *****: Connection timeout (-6 timeout connecting)
Mar 11 06:17:27 Macintosh-3 airportd[116]: Error: processcommanddict() failed
Mar 11 06:17:32 Macintosh-3 airportd[116]: Error: Apple80211Associate() failed -6
Mar 11 06:17:32 Macintosh-3 SystemUIServer[98]: Error: airportd MIG failed = -6 ((null)) (port = 66187)
Mar 11 06:17:32 Macintosh-3 SystemUIServer[98]: Error joining *****: Connection timeout (-6 timeout connecting)
Mar 11 06:17:32 Macintosh-3 airportd[116]: Error: processcommanddict() failed
Mar 11 06:17:33 Macintosh-3 ntpd[16]: sendto(17.151.16.23) (fd=23): No route to host
Mar 11 06:17:35 Macintosh-3 airportd[116]: Error: Apple80211Associate() failed -6
Mar 11 06:17:35 Macintosh-3 SystemUIServer[98]: Error: airportd MIG failed = -6 ((null)) (port = 66187)
Mar 11 06:17:35 Macintosh-3 SystemUIServer[98]: Error joining *****: Connection timeout (-6 timeout connecting)
Mar 11 06:17:35 Macintosh-3 airportd[116]: Error: processcommanddict() failed
Mar 11 06:17:51 Macintosh-3 airportd[116]: Error: Apple80211Associate() failed -6
Mar 11 06:17:51 Macintosh-3 SystemUIServer[98]: Error: airportd MIG failed = -6 ((null)) (port = 66187)
Mar 11 06:17:51 Macintosh-3 airportd[116]: Error: processcommanddict() failed
Mar 11 06:17:56 Macintosh-3 airportd[116]: Error: Apple80211Associate() failed -6
Mar 11 06:17:56 Macintosh-3 SystemUIServer[98]: Error: airportd MIG failed = -6 ((null)) (port = 66187)
Mar 11 06:17:56 Macintosh-3 SystemUIServer[98]: Error joining *****: Connection timeout (-6 timeout connecting)
Mar 11 06:17:56 Macintosh-3 airportd[116]: Error: processcommanddict() failed
Mar 11 06:18:28 Macintosh-3 airportd[125]: AirPort off, bailing - GetPower() = off (0)
Mar 11 06:18:36 Macintosh-3 airportd[125]: Error: Apple80211Associate() failed -6
Mar 11 06:18:47: --- last message repeated 1 time ---
Mar 11 06:18:47 Macintosh-3 Apple80211Agent[126]: Error: airportd MIG failed = -6 ((null)) (port = 25091)
Mar 11 06:18:47 Macintosh-3 Apple80211Agent[126]: Error joining *****: Connection timeout (-6 timeout connecting)
Mar 11 06:18:47 Macintosh-3 airportd[125]: Error: processcommanddict() failed
Mar 11 06:19:21 Macintosh-3 airportd[127]: Error: Apple80211Associate() failed -6
Mar 11 06:19:21 Macintosh-3 SystemUIServer[98]: Error: airportd MIG failed = -6 ((null)) (port = 66187)
Mar 11 06:19:21 Macintosh-3 airportd[127]: Error: processcommanddict() failed
Mar 11 06:19:33 Macintosh-3 airportd[127]: Error: Apple80211Associate() failed -6
Mar 11 06:19:33 Macintosh-3 SystemUIServer[98]: Error: airportd MIG failed = -6 ((null)) (port = 66187)
Mar 11 06:19:33 Macintosh-3 SystemUIServer[98]: Error joining *****: Connection timeout (-6 timeout connecting)
Mar 11 06:19:33 Macintosh-3 airportd[127]: Error: processcommanddict() failed
Mar 11 06:28:16 Macintosh-3 airportd[132]: AirPort off, bailing - GetPower() = off (0)
Mar 11 06:28:34 Macintosh-3 airportd[132]: Error: Apple80211Associate() failed -6
Mar 11 06:29:04: --- last message repeated 1 time ---
Mar 11 06:33:45 Macintosh-3 airportd[170]: Error: Apple80211Associate() failed -6
Mar 11 06:33:45 Macintosh-3 SystemUIServer[98]: Error: airportd MIG failed = -6 ((null)) (port = 66187)
Mar 11 06:33:45 Macintosh-3 airportd[170]: Error: processcommanddict() failed
Mar 11 06:33:55 Macintosh-3 airportd[170]: Error: Apple80211Associate() failed -6
Mar 11 06:33:55 Macintosh-3 SystemUIServer[98]: Error: airportd MIG failed = -6 ((null)) (port = 66187)
Mar 11 06:33:55 Macintosh-3 SystemUIServer[98]: Error joining *****: Connection timeout (-6 timeout connecting)
Mar 11 06:33:55 Macintosh-3 airportd[170]: Error: processcommanddict() failed
Mar 11 06:34:01 Macintosh-3 kernel[0]: AirPort: Link Up on en1
Feb 8 22:50:34 Macintosh-3 airportd[664]: Error: Apple80211Associate() failed -6
Feb 8 22:50:36 Macintosh-3 airportd[664]: Error: Apple80211Associate() failed -6
Feb 8 22:50:47 Macintosh-3 Apple80211Agent[665]: Error: airportd MIG failed = -6 ((null)) (port = 25091)
Feb 8 22:50:47 Macintosh-3 airportd[664]: Error: processcommanddict() failed
Feb 8 22:51:10 Macintosh-3 airportd[664]: Error: Apple80211Associate() failed -6
Feb 8 22:51:10 Macintosh-3 Apple80211Agent[665]: Error: airportd MIG failed = -6 ((null)) (port = 25091)
Feb 8 22:51:10 Macintosh-3 airportd[664]: Error: processcommanddict() failed
Feb 8 22:51:26 Macintosh-3 airportd[664]: Error: Apple80211Associate() failed -6
Feb 8 22:51:26 Macintosh-3 Apple80211Agent[665]: Error: airportd MIG failed = -6 ((null)) (port = 25091)
Feb 8 22:51:26 Macintosh-3 airportd[664]: Error: processcommanddict() failed
Feb 8 22:52:25 Macintosh-3 airportd[673]: Error: Apple80211Associate() failed -6
Feb 8 22:52:25 Macintosh-3 airportd[673]: Error: processcommanddict() failed
Feb 8 22:52:25 Macintosh-3 SystemUIServer[576]: Error: airportd MIG failed = -6 ((null)) (port = 70223)
Feb 8 22:52:31 Macintosh-3 airportd[673]: Error: Apple80211Associate() failed -6
Feb 8 22:52:31 Macintosh-3 SystemUIServer[576]: Error: airportd MIG failed = -6 ((null)) (port = 70223)
Feb 8 22:52:31 Macintosh-3 airportd[673]: Error: processcommanddict() failed
Feb 8 22:52:34 Macintosh-3 airportd[673]: Error: Apple80211Associate() failed -6
Feb 8 22:52:34 Macintosh-3 SystemUIServer[576]: Error: airportd MIG failed = -6 ((null)) (port = 70223)
Feb 8 22:52:34 Macintosh-3 airportd[673]: Error: processcommanddict() failed
Feb 8 22:52:47 Macintosh-3 airportd[673]: Error: Apple80211Associate() failed -6
Feb 8 22:52:47 Macintosh-3 SystemUIServer[576]: Error: airportd MIG failed = -6 ((null)) (port = 70223)

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