For RSL's period of record (1/1/91 to present) 
rainfall on 11/20/98 and 11/21/98 set quite a few local records:

Maximum daily amount 5.43" Saturday Nov 21, 1998
Maximum 24-hr amount 6.87" ending at 5 pm Saturday Nov 21, 1998
Maximum 12-hr amount 4.67" ending at 10:10 am Saturday Nov 21, 1998
Maximum 6-hr amount 2.57" ending at 3:20 am Saturday Nov 21, 1998
(There were 2 non-overlapping 6-hour periods that both 
broke the previous record)

For short durations, the records still stand from Feb 21, 1998:

Maximum 2-hr amount   1.10" ending at Feb 21, 1998: 0250
Maximum 1-hr amount   0.84" ending at Feb 21, 1998: 0250
Maximum 30-min amount 0.65" ending at Feb 21, 1998: 0240