> Yuan: > > The reason why I think I'm not geteting 0 hour analyses is that there is > 3-hour accumulated precipitation at 1800 UTC, 0000 UTC, etc. That field > should be zero at an analysis time. At least that's they way it has > been historically. Perhaps it is using a 3-hour forecast rather than a > 6-hour forecast, but in any event, it's not grabbing the analysis time > as it should. > > Yes, a proposed analysis dataset collection might help, although if you > want something every 3-hours from the NAM or GFS, we still need to find > a way to put the 3-h forecasts in there. However, I think it will > probably help quite a bit with the HRRR. > > Jim > Jim, The parameter of 3-hour accumulated precipitation is very unique in the BST, it is so called time interval variable. John believes it is better to use previous run value for the current run 0 hour. Otherwise, the it is difficult to find the physical meaning of 0 hour value for the parameter of 3-hour accumulated precipitation. Yuan > > On 2/11/15, 10:39 PM, Unidata IDV Support wrote: > >> Yuan: > >> > >> Here's another issue that might be more on the THREDDS Side than IDV. > >> > >> In the attached bundle gfs-BTS-problem.xidv, I'm accessing 3-h GFS > >> Best Time Series data. Note in the outgoing long-wave radiation how it > >> is flicking back and forth presumably from differing model grids. These > >> are clearly not analysis times or forecast hours from the same model. > >> > >> Also, I thought that "Best Time Series" was supposed to grab > >> analysis grids where possible? In the attached atmos5010-nam.xidv > >> bundle, it is clearly grabbing forecast grids when it should be grabbing > >> analysis grids. > >> > >> Let me know if you have further questions. > >> > >> Jim > > Jim, > > At this point, we know what is going on with the Best Time Series > > (BTS) of GFS. I think the proposed analysis dataset collection > > will be very helpful for your case. > > > > By the way, I did some tests on the NAM 12 km BTS and individual > > runs, it does look correct to me and I wonder how > > you come to the conclusion of: " First, during the periods prior to the > > latest model run, I should be getting 0 hour analyses or > > 3 hour forecasts from the NAM. That isn't the case, at least at times when > > a 0 hour analysis is available. Instead, > > I'm getting a 6 hour forecast (see, for example, 00, 06, 12, or 18 UTC > > times early in the loop when satellite and radar > > imagery are available." > > > > I compared the first few time steps of BTS with each individual runs, > > not seeing any 6 hour forecast in the BTS. Do I miss > > something? > > > > Yuan > >> > >> > > Ticket Details > > =================== > > Ticket ID: XNQ-939998 > > Department: Support IDV > > Priority: Normal > > Status: Open > > > > Ticket Details =================== Ticket ID: XNQ-939998 Department: Support IDV Priority: Normal Status: Open
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