Hi Patrick,
I think I might know what is going on here....maybe.
I pulled up the
RTMA
QC kml and opened it with Google Earth for 1/30/2021 00 UTC.
KDYT is in there twice, once as "KDYT" with the provider
as "METAR" showing an observed wind speed of 13.02 knots.
It is also listed as "KDYT" with the provider "GLERL
ADJUSTED" with an observed value of 22.04 knots. That value in
your plot looks like it matches the GLERL ADJUSTED. Greg Mann would
know way more about this, but basically, the GLERL Adjusted obs were
created to help with the lake/land mask when the RTMA was using a
course background, RAP I think. Around a year ago this topic came
up and we were able to blacklist the GLERL adjusted because they
were causing issues in the RTMA/URMA analysis and therefore NBM bias
correction, and not really necessary with the HRRR as the background.
I've cc'd Greg Mann, maybe he can chime in.
Best,
-Nick
All,
I
noticed winds at KDYT Duluth Sky Harbor Airport in the marine
environment (see map below) have been really too low the past
couple of days. All of our sites outside of the marine
environment have been tracking much better:
Thanks!
--
Patrick Ayd
Science and
Operations Officer
NOAA/NWS WFO
Duluth, MN
Office: 218-729-6697
Cell: 651-245-7829
--
Nick Langlieb
Science
and Operations Officer
National
Weather Service
WFO
Marquette, MI
906-475-5782 ext 766
