[Ncep.list.idp.mrms.users] Some bad Canadian Radar data not getting QC'd out of MRMS, impacting QPE

Joseph Moore - NOAA Federal joseph.moore at noaa.gov
Wed Jul 18 14:23:06 UTC 2018

Thank you for the quick response, Derek! I look forward to follow-up from
NSSL as they have time.


On Wed, Jul 18, 2018 at 9:09 AM, Derek VanPelt - NOAA Affiliate <
derek.vanpelt at noaa.gov> wrote:

> Hi Joseph,
> Thanks much for the detailed feedback.  I am going to pass this email back
> to the MRMS development team at NSSL, as they will be best to respond and
> address your concerns.
> If there is anything else we can do please let us know.
> Derek
> On Wed, Jul 18, 2018 at 9:57 AM, Joseph Moore - NOAA Federal <
> joseph.moore at noaa.gov> wrote:
>> Good morning,
>> I just wanted to share some feedback on MRMS and Canadian Radar data.
>> We've noticed that some mornings we see the Canadian radar reflectivity
>> data not being QC'd out of MRMS, causing errors in QPE. This was an issue a
>> week ago when we had a period of heavy rainfall, but then the QPE got
>> exaggerated (values increased due to bad reflectivity) along the
>> international border in northern Minnesota. I have attached (via Google
>> Drive) a few GIFs of MRMS products this morning demonstrating the bad
>> reflectivity values being ingested and accumulating on the QPE product in
>> northern Minnesota.
>> Problem: Some high reflectivity values from morning inversions are being
>> ingested into MRMS precip products from our Canadian radars. (Specifically
>> Dryden radar and occasionally the Superior West (Thunder Bay) radar site.)
>> Expected behavior: Since there is no precip in the area (no clouds), I
>> would expect these values to be QC'd out like MRMS usually does.
>> When the problem occurs: Usually in the morning hours when a strong
>> inversion is present.
>> Urgency: This is not an urgent issue, but it would be good to see
>> addressed eventually since MRMS precip impacts so many things downstream,
>> like FLASH.
>> Linked GIFs show (from top left, clockwise): GOES-16 Clean IR Ch 11,
>> GOES-16 Red Vis Ch 2, 0.5 degree NEXRAD Reflectivity composite, and the
>> MRMS product in question. (In one GIF I included the MRMS 1-hour QPE to
>> show that MRMS is accumulating these reflectivity values as precip.)
>> Let me know if you have any other questions. I can continue to send
>> examples if it would help diagnose the issue.
>> **NOTE** This has NOTHING to do with the MRMS outage this morning even
>> though some of the frames in this GIF are from when the issues were
>> happening.
>> -Joe Moore
>>>>  2018-07-18-12z-mrms-Composite-1KM.gif
>> <https://drive.google.com/a/noaa.gov/file/d/17tHY7INKLiHiFBgI6I9xuB0ZnYElTyRA/view?usp=drive_web>
>> ​​
>>  2018-07-18-12z-mrms-RALA.gif
>> <https://drive.google.com/a/noaa.gov/file/d/1NhS2-2jMclsi6bEB38Z-J0Ubvak35wx3/view?usp=drive_web>
>> ​​
>>  2018-07-18-12z-mrms-SHSR+1hr-QPE.gif
>> <https://drive.google.com/a/noaa.gov/file/d/15f0nxGsdgU_uFUzy9MEywXrNdOU0e5xw/view?usp=drive_web>
>> ​​
>>  2018-07-18-12z-mrms-SHSR.gif
>> <https://drive.google.com/a/noaa.gov/file/d/1T7TIPx5Hh7Fk8L3Vfj-D8csl95NkJtCy/view?usp=drive_web>
>> --
>> *Joseph J. Moore*
>> Meteorologist | WFO Duluth Social Media & IDSS Program Leader | Open
>> Source GIS Evangelist
>> NOAA/National Weather Service Duluth, MN
>> _______________________________________________
>> Ncep.list.idp.mrms.users mailing list
>> Ncep.list.idp.mrms.users at lstsrv.ncep.noaa.gov
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>> idp.mrms.users
> --
> Derek Van Pelt
> IDP Onboarding

*Joseph J. Moore*
Meteorologist | WFO Duluth Social Media & IDSS Program Leader | Open Source
GIS Evangelist
NOAA/National Weather Service Duluth, MN
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