Topic: SNPP CRIS Midwave (MW) Anomaly

Date/Time Issued: March 29, 2019 2110 UTC

Product(s) or Data Impacted: SNPP CRIS products

Date/Time of Initial Impact: March 26, 2019 2000 UTC

Date/Time of Expected End: TBD

Length of Outage: TBD

Details/Specifics of Change: M-BThe SNPP Cross-track Infrared Sounder (CrIS) MW (Mid-wave) region started tripping quality flags and resulting in fill data for that portion of the spectrum. The SW (Short-wave) and LW (Long-wave) IR (Infra-Red) regions are nominal.M-B Engineers and the CrIS instrument vendor are analyzing available information to determine whether the root cause is related to a MW signal processor board issue.

Efforts are underway to determine the root cause and to develop options to return the SNPP CrIS MW region back to nominal conditions. The affected MW region is being populated with fill data and the quality flags reflect that portion of the spectrum is not currently usable. M-B

CrIS Products Affected:

- Outgoing Longwave Radiation (OLR)

- Trace gas retrievals (Ozone, Methane, Carbon Dioxide, Carbon Monoxide)

- Atmospheric Vertical Moisture/Temperature Profiles

- MW Radiances

Please note: Daily ESPC notices will not be sent until further information is made available warranting another update.

Contact Information for Further Information: ESPC Operations at ESPCOperations@noaa.gov and 301-817-3880

Web Site(s) for applicable information: N/A

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