Update #6: The SNPP CrIS side-2 SDR met the Provisional maturity requirements on August 1, 2019 at 16:49:40 UTC.M-B The NUCAPS team confirmed that performance of the CrIS side-2 met specifications without the need for further updating of codes/coefficient files.M-B Based on the documentation provided from the NUCAPS team on August 6, 2019, the SNPP NUCAPS EDRs produced from side-2 SDRs are also at the Provisional maturity level. SNPP EDRs will resume nominal processing and distribution starting on August 12, 2019 around 1600 UTC.

Update #5: The two-week SNPP CrIS switch effort has concluded and has now achieved provisional maturity status. SNPP CrIS products is now available to all approved users.

Update #4: The full recovery/reactivation plan of SNPP CrIS will commence June 24, 2019 at 1332 UTC.

Update #3: The full recovery/reactivation plan of SNPP CrIS has moved to no earlier than June 25, 2019.

M-B

Update #2: The timing and approval has been confirmed for the full recovery/reactivation plan of SNPP CrIS.

M-B

Update #1: M-B This notification is being withdrawn since it was prematurely released.M-B Once the exact timing and approval of the full recovery/reactivation plan of the SNPP CrIS is confirmed, a follow-up notification will be issued.

M-B

Topic: SNPP CrIS Switch to Side-2 Electronics

Date/Time Issued: August 8, 2019 1955 UTC

Product(s) or Data Impacted: SNPP/CrIS products, including CrIS RDR, SDR and NUCAPS L2 products

Date/Time of Initial Impact:M-B June 25, 2019 1800 UTC

Date/Time of Expected End:M-B ~14 weeks later

Length of Outage: up to 14 weeks from time of initiation

Details/Specifics of Change:M-B During the week of June 25-28, 2019 a switch of the SNPP/ Cross-track Infrared Sounder (CrIS) electronics from the current side-1 to the redundant side-2 will be performed.M-B This effort will be undertaken to recover from a CrIS midwave signal processor failure that occurred on side-1. Once the switch over to side-2 is initiated, all SNPP/CrIS science data (including NUCAPS L2 data) will be unavailable for up to a two week period as instrument adjustments are being performed.M-B Once the two-week switch effort is concluded, a 12-week Calibration/Validation effort will be undertaken to ensure the CrIS data is at the highest quality and maturity levels.M-B

All SNPP/CrIS Products will be affected:

- During the first 2 weeks, all SNPP/CrIS products will be unavailable.

- After the initial 2 weeks, products will only be available to Cal/Val approved users.

- When the Cal/Val period is complete, all SNPP CrIS products will be made available to all approved users.

Important note: HRD/Direct Readout users should not use the data until notified that the data has reached an acceptable maturity level.M-B

The Beta, Provisional and Full Validation Readiness definitions are:

- Beta -

- Product is minimally validated, and may still contain significant identified and unidentified errors.

- Information/data from validation efforts can be used to make initial qualitative or very limited quantitative assessments regarding product fitness-for-purpose.

- Documentation of product performance and identified product performance anomalies, including recommended remediation strategies, exists.

- Provisional

- Product performance has been demonstrated through analysis of a large, but still limited (i.e., not necessarily globally or seasonally representative) number of independent measurements obtained from selected locations, time periods, or field campaign efforts.

- Product analyses are sufficient for qualitative, and limited quantitative, determination of product fitness-for-purpose.

- Documentation of product performance, testing involving product fixes, identified product performance anomalies, including recommended remediation strategies, exists.

- Product is recommended for potential operational use (user decision) and in scientific publications after consulting product status documents.

- Full Validation

- Product performance has been demonstrated over a large and wide range of representative conditions (i.e., global, seasonal).

- Comprehensive documentation of product performance exists that includes all known product anomalies and their recommended remediation strategies for a full range of retrieval conditions and severity level.

- Product analyses are sufficient for full qualitative and quantitative determination of product fitness-for-purpose.

- Product is ready for operational use based on documented validation findings and user feedback.

- Product validation, quality assurance, and algorithm stewardship continue through the lifetime of the instrument.

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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