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Overview of upgrade scheduled for December 2017. Note that this was originally scheduled for October 2017, but has been pushed back due to technical issues.

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URMA wind errors at SF Bay Area ASOS sites during recent RFW/High Wind event

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Warren Blier, modified 4 Years ago.

URMA wind errors at SF Bay Area ASOS sites during recent RFW/High Wind event

Youngling Posts: 14 Join Date: 9/24/12 Recent Posts
Comparing 08Z Mon Oct 26 URMA winds at SF Bay Area ASOS sites with corresponding METARS
image.png

Aside from KLVK and KCCR, differences are really large.  Wondering why?

Thanks,

Warren

-------------------------------------------
Warren Blier, Ph.D.
Science and Operations Officer
NOAA/NWS San Francisco Bay Area Forecast Office
831-238-8109 (cell)
831-656-1724 (ops floor)  



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Matthew Morris, modified 4 Years ago.

RE: URMA wind errors at SF Bay Area ASOS sites during recent RFW/High Wind event

Youngling Posts: 175 Join Date: 12/6/17 Recent Posts
Hi Warren,

When considering the URMA wind speed analysis valid 08Z 26 October, the background fields (from the HRRR) are responsible for the analyzed wind speeds being weaker than observed at the METAR sites.

The attached slide deck shows that the analyzed winds from URMA are stronger than the background winds at all METAR sites except for KSTS.  In the case of KSTS, there is a nearby mesonet station (RZAC1) that is reporting weaker winds (3.46 kts).  I would suggest taking a closer look at the data from this mesonet station to determine if it should be flagged.
Lastly, RAPv5/HRRRv4 is scheduled for implementation in December.  Any improvements to the wind forecasts in HRRRv4 will also help improve the RTMA/URMA wind analyses.

Matt

On Wed, Oct 28, 2020 at 8:31 PM VLab Notifications <VLab.Notifications@noaa.gov> wrote:
Comparing 08Z Mon Oct 26 URMA winds at SF Bay Area ASOS sites with corresponding METARS
image.png

Aside from KLVK and KCCR, differences are really large.  Wondering why?

Thanks,

Warren

-------------------------------------------
Warren Blier, Ph.D.
Science and Operations Officer
NOAA/NWS San Francisco Bay Area Forecast Office
831-238-8109 (cell)
831-656-1724 (ops floor)  




--
Warren Blier RTMA/URMA Discussion Group Virtual Lab Forum http://vlab.noaa.gov/web/715073/home/-/message_boards/view_message/12349934VLab.Notifications@noaa.gov


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  • 2011 RTMA Paper (Weather and Forecasting)

    The most recent peer-reviewed paper on the RTMA. Published in Weather and Forecasting in 2011.
    7 Visits

  • Public RTMA/URMA Viewer

    Another viewer of the current RTMA/URMA, with an archive going back 24 hours. This version is open to the public, but does not contain information about the (many) restricted obs used.
    54 Visits

  • RAP downscaling conference preprint (23rd IIPS)

    This link is to a presentation from the (then) RUC group on how the downscaling process works. Although we now use the RAP, HRRR, and NAM, the logic of the downscaling code is mostly unchanged from this point.
    2 Visits