GOES-13 Sounder Filter Wheel Anomalies Return
The GOES-13 Sounder imagery has shown signatures intermittently over the past 4 days that suggest a Filter Wheel Anomaly is ongoing. The image above is from 0246 UTC on 17 July 2012. Similar events occurred on 16 July (at 0046 and 1446 UTC), on 15 July (at 2346 UTC), on 14 July (at 1946 UTC) and on 13 July (1346, 1846, 2046 and 2146 UTC). The GOES-13 Sounder suffered from Filter Wheel Anomalies in June, as well, as noted here.
As before, when the GOES Sounder Data are degraded by filter wheel anomalies, derived products (such as Total Precipitable Water, or Lifted Index), are also degraded. An example of Total Precipitable Water computed when there are Filter Wheel Anomalies in the data is shown below. The Blended Total Precipitable Water products in AWIPS are unaffected, however (Link), because they rely on GPS data over land.
[Update, 23 July 2012 and 25 July] Sounder anomalies persist, and occurred at 2246 UTC and 2346 UTC on 19 July, at 0346 UTC on 20 July, and 2046 UTC on 22 July; at 0046 UTC, 1446 UTC and 1546 UTC on 24 July; at 0046 UTC, 0146 UTC and 0246 UTC on 25 July; at 0546 UTC and 2346 UTC on 26 July; at 2046 UTC and 2146 UTC on 30 July and at 1847 UTC and 2047 UTC on August 4th.