Subject: Product Anomaly,NOAA-19 AMSU-A AND MHS Issued: July 01, This is a multi-part message in MIME format. --------------070502040506060906090800 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit *UPDATE: **Update: It is still early, but it appears that the behavior of the NOAA-19 AMSU-A instrument is back to normal. We will monitor these data closely and advise the users to also monitor these data closely for the near future. The behavior of the NOAA-19 MHS is still abnormal, and we continue to investigate its behavior. * Topic: *NOAA-19 AMSU-A and MHS* Date/Time Issued: *JULY** 01, 2009 1530 UTC* Product(s) or Data Impacted*:** NOAA-19 AMSU-A and MHS Level 1b; TOVS; MIRS; MSPPS* Date/Time of Initial Impact: *JUNE 27, 2009 * Date/Time of Expected End: *Unknown* Length of Event: *TBD * Impacts on Users and Significance: *NESDIS has evaluated the impact of the NOAA-19 AMSU-A and MHS anomalies on the TOVS sounding products and the analysis did not show any significant differences. Therefore, at this point ESPC will not suspend distribution of the products. ESPC also concluded that there has not been any significant impacts on the MIRS products. All other AMSU and MHS instruments are operating normally.* *NESDIS has been in contact with the National Weather Service (NWS) National Centers for Environmental Prediction (NCEP) Environmental Modeling Center (EMC) and they have adjusted the model parallel assimilation to remove NOAA-19 AMSU-A channel 8.* User Actions: *Users are encouraged to review all products using NOAA-19 AMSU-A and MHS level 1b.* Details/Specifics of Change: NESDIS Center for Satellite Applications and Research (STAR) has detected several anomalies with the NOAA-19 AMSU-A (Advanced Microwave Sounding Unit) and MHS (Microwave Humidity Sensor). The AMSU-A channels 3 and 8 are showing high errors, as well as the MHS channels 3 and 4. NESDIS STAR, OSO, and OSDPD are currently investigating the issue. Preliminary analysis indicates the AMSU-A and MHS errors began around June 27, 2009. Contact Information for Further Information: *ESPC Operations Crew Leader at ESPCOperations@noaa.gov and 301-817-3880* Web Site(s) for applicable information: Operational AMSU retrievals: http://www.osdpd.noaa.gov/soundings/html/N19/AODF/bt_t1.html NESDIS STAR Calibration for NOAA-19 AMSU: http://www.star.nesdis.noaa.gov/smcd/spb/icvs/satMonitoring_n19_amax.php NESDIS STAR Calibration for NOAA-19 MHS: http://www.star.nesdis.noaa.gov/smcd/spb/icvs/satMonitoring_n19_mhsx.php --------------070502040506060906090800 Content-Type: text/html; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit UPDATE: Update: It is still early, but it appears that the behavior of the NOAA-19 AMSU-A instrument is back to normal. We will monitor these data closely and advise the users to also monitor these data closely for the near future. The behavior of the NOAA-19 MHS is still abnormal, and we continue to investigate its behavior.

Topic: NOAA-19 AMSU-A and MHS

Date/Time Issued: JULY 01, 2009 1530 UTC

Product(s) or Data Impacted: NOAA-19 AMSU-A and MHS Level 1b; TOVS; MIRS; MSPPS

Date/Time of Initial Impact: JUNE 27, 2009

Date/Time of Expected End: Unknown

Length of Event: TBD

Impacts on Users and Significance: NESDIS has evaluated the impact of the NOAA-19 AMSU-A and MHS anomalies on the TOVS sounding products and the analysis did not show any significant differences. Therefore, at this point ESPC will not suspend distribution of the products. ESPC also concluded that there has not been any significant impacts on the MIRS products. All other AMSU and MHS instruments are operating normally.

NESDIS has been in contact with the National Weather Service (NWS) National Centers for Environmental Prediction (NCEP) Environmental Modeling Center (EMC) and they have adjusted the model parallel assimilation to remove NOAA-19 AMSU-A channel 8.

User Actions: Users are encouraged to review all products using NOAA-19 AMSU-A and MHS level 1b.

Details/Specifics of Change: NESDIS Center for Satellite Applications and Research (STAR) has detected several anomalies with the NOAA-19 AMSU-A (Advanced Microwave Sounding Unit) and MHS (Microwave Humidity Sensor). The AMSU-A channels 3 and 8 are showing high errors, as well as the MHS channels 3 and 4. NESDIS STAR, OSO, and OSDPD are currently investigating the issue. Preliminary analysis indicates the AMSU-A and MHS errors began around June 27, 2009.

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

Web Site(s) for applicable information: Operational AMSU retrievals: http://www.osdpd.noaa.gov/soundings/html/N19/AODF/bt_t1.html NESDIS STAR Calibration for NOAA-19 AMSU: http://www.star.nesdis.noaa.gov/smcd/spb/icvs/satMo NESDIS STAR Calibration for NOAA-19 MHS: http://www.star.nesdis.noaa.gov/smcd/spb/icvs/satMo

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