Change Log for TAQ regional RUC10 runs at FSL

    Main RUC homepage

    Be sure also to look at: Development RUC20 (used for initializing TAQ RUC10 runs) change log

    This change log starts from late August 2002.

    2 August 2002 - 0000 UTC

    HYBPOST - fixes to BUFR output, precip type.

    14 August 2002 - 1800 UTC

    Updated SST/LST file - was using 24 July data for last 3 weeks

    26 August 2002 - 1800 UTC

    HYBCST - (soil123.F, soilsnow.F, sfctmp.F, inithybv.F, POINT2D, SOILVEG) - fix for thin snow problem with near-surface temperatures

    26 August 2002 - 1800 UTC

    HYBPOST - more fixes to BUFR output.

    27 August 2002 - 1800 UTC

    HYBCST - Increase ice particle fall speed from formula which typically gave 10-25 cm/s up to 1 m/s. Done to decrease excessive cirrus cloud.

    18 Sept 2002 - 1200 UTC

    HYBCST - roughness length for deciduous and evergreen forest vegetation types decrease from 0.8-2.0 m down to maximum of 0.5 m. Done to improve light wind bias in RUC over northeastern US where these land-use types are dominant.

    19 Sept 2002 - 1800 UTC

    HYBPOST - Yesterday's change also needed in post-processing -- roughness length for deciduous and evergreen forest vegetation types decrease from 0.8-2.0 m down to maximum of 0.5 m. Done to improve light wind bias in RUC over northeastern US where these land-use types are dominant.

    8 Jan 2003 - 1800 UTC

    HYBCST - Switch to centered differencing for vertical advection of moisture instead of upstream. Includes stability check. Improves moisture conservation and increases overall model precip 5-7% in winter and summer case studies
    Allow sub-grid-scale precipitation processes to co-exist when resolved scale precipitation is forecast in a given time step. Previously, this had not been allowed in an attempt to force more resolved-scale precipitation, but with the introduction of centered differencing in the vertical moisture advection (above), the precip behavior now appears more realistic to remove this previous constraint.
    Implement land-surface model changes for thin snow cover, which avoids cold spots. This is the same package implemented into the operational RUC20 in early October 2002.