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Update #1: M-B This notification is being withdrawn since it was prematurely released.M-B Once the exact timing and approval of the full recovery/reactivation plan of the SNPP CrIS is confirmed, a follow-up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