Can u count a certain # of things that occur over a range of dates?

I need to know if: Is is possible to determine which meter_ids have more than 30 consective days of -99 readings in the period from 1/96 to 12/98?

I have a 2,000,0000 row table with the following structure

meter_id         varchar
reading_dt      date
read1-24           number


meter_id        reading_date    read1   read2....read24
243344          01/01/1996      3       41       -99     4


..


243344          12/31/19998     4       -99     65      2
36456            01/01/1996    -99      -99     -99      -99


...            


36456           12/31/19998     -99     -99     -99     3

each meter_id can have up to 1096 rows (one for each day from 1/96 to 1/98) some will have a value of -99 which indicates a missing read.

What I need to know is: Is is possible to determine which meter_ids have more than 30 consective days of -99 readings in the period from 1/96 to 12/98? I need at least 30 not less Received on Tue May 04 1999 - 18:55:11 CDT