Reminder: T he IMS Snow Depth Product Correction is scheduled to occur on Tuesday, March 26, 2019 at 1800 UTC.

Update #2: Due to the extension of Critical Weather Day (CWD), the I MS Snow Depth Product Correction has been rescheduled to occur on Tuesday, March 26, 2019 at 1800 UTC.

Update #1: Due to Critical Weather Day (CWD), the I MS Snow Depth Product Correction scheduled for Wednesday, March 20, 2019 at 1800 UTC has been rescheduled to occur on Thursday, March 21, 2019 at 1800 UTC.

Topic: IMS Snow Depth Product Correction

Date/Time Issued: February 19, 2019 M-B2215 UTC

Product(s) or Data Impacted: M-BIMS Snow Depth GRIB2 product

Date/Time of Initial Impact: March 20, 2019 1800 UTC

Date/Time of Expected End: N/A

Length of Outage: See details below.

Details/Specifics of Change: M-BA correction to the Interactive Multisensor Snow and Ice Mapping System (IMS) M-bM-^@M-^\Snow DepthM-bM-^@M-^] and M-bM-^@M-^\Snow Depth QCM-bM-^@M-^] products will be implemented on March 20, 2019 at 1800 UTC. The change will correct the product units.

The IMS M-bM-^@M-^\Snow DepthM-bM-^@M-^] and M-bM-^@M-^\Snow Depth QCM-bM-^@M-^] are fields within the IMS 4KM GRIB2 snow-products output file. They are pixel maps with resolution and geometry coincident to the IMS snow/ice cover products. M-BM-B

Please Note: The M-bM-^@M-^\Snow DepthM-bM-^@M-^] field will be changed from centimeters to meters, correctly matching its GRIB2 parameter unit.M-B Users should give attention to modify if necessary any hard coded units in software.

The M-bM-^@M-^\Snow Depth QCM-bM-^@M-^] field will range from 0. to 1., with larger values indicating increasing confidence. M-B This change will fix current output that was incorrectly copying snow depth values.

The M-bM-^@M-^\Snow CoverM-bM-^@M-^] and M-bM-^@M-^\Days-Since-Last-ObservedM-bM-^@M-^] fields will remain unchanged.

The affected product has the following filename and PDA product shortname:

NIC.IMS_snow_v3_YYYYJJJHH_4km.GRIB2.gz M-BM-B NESDIS_IMS-V3_snow_4km

This product algorithm change will be rescheduled in the event of a Critical Weather Day (CWD).

Contact Information for Further Information: John Woods at John.Woods@noaa.gov

M-B

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

M-B

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