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[aor-rtma] Low dew points Rocky Mountain Front MT

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David Bernhardt, modified 3 Years ago.

[aor-rtma] Low dew points Rocky Mountain Front MT

Youngling Posts: 27 Join Date: 9/24/12 Recent Posts
I have not been able to find obs that support the low dew points analyzed in the RTMA to the lee of the Rocky Mountains in MT.

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Dave Bernhardt

 

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Matthew Morris, modified 3 Years ago.

RE: [aor-rtma] Low dew points Rocky Mountain Front MT

Youngling Posts: 158 Join Date: 12/6/17 Recent Posts
Hi Dave,

Please see the attached slide deck:
There is a moisture observation that isn't displayed on the NBM Viewer nor in the URMA KML files: HADS station GSNM8 (circled in red on slide 3).  Recall that moisture observations will not be included in the URMA KML files for dew point temperature if the station does not also report temperature and pressure.

However, this behavior appears to be due to the analysis overfitting observations in the vicinity, as none of the nearby specific humidity observations are < 1 g/kg and the large negative increment on slide 4 is centered between GSNM8 and the mesonet stations immediately to the east.  We could try to flag moisture observations from GSNM8 to see if that resolves the issue.  Please let us know if you wish to flag this station.

Also, we will be using shorter correlation lengths in the upcoming 3D-RTMA system (implementation expected in FY2023), which should help with the overfitting issue.

Matt

On Tue, Nov 3, 2020 at 1:31 PM VLab Notifications <VLab.Notifications@noaa.gov> wrote:
I have not been able to find obs that support the low dew points analyzed in the RTMA to the lee of the Rocky Mountains in MT.

image.png

Dave Bernhardt

 


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David Bernhardt RTMA/URMA Discussion Group Virtual Lab Forum http://vlab.noaa.gov/web/715073/home/-/message_boards/view_message/12414731VLab.Notifications@noaa.gov

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