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Feb 17/18 Storm Threat - Discussion


mahk_webstah

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Eh, I don't buy the 18z run hiccup stuff. Better chance this just brushes us.

 

I haven't looked at probably 2 panels of any model on this event not will I for another day.   When the models haven't locked like the Blizzard it just seems to be a waste of time as there's so much play in the tracks.

 

That said, the off hour stuff hasn't been as good lately, not sure why.  Obviously has something to do with the pattern, speed of s/w's etc.

 

I'd stick with the Canadian stuff for now to be honest.

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I haven't looked at probably 2 panels of any model on this event not will I for another day.   When the models haven't locked like the Blizzard it just seems to be a waste of time as there's so much play in the tracks.

 

That said, the off hour stuff hasn't been as good lately, not sure why.  Obviously has something to do with the pattern, speed of s/w's etc.

 

I'd stick with the Canadian stuff for now to be honest.

 

LOL, Canadian? We all hope. It's possible it comes in better...we'll see.

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let's not focus so much on the coastal..I think that's what some folks are thinking is going to prodcue the snows.

 

teh Euro ens have a nice widespread .25-.50 reginwide..Its going to snow a few inches minimum..If the coastal gets going quicker and closer in,,then we can start talking Ukie like totals..if not it's a 3-5 type event

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let's not focus so much on the coastal..I think that's what some folks are thinking is going to prodcue the snows.

 

teh Euro ens have a nice widespread .25-.50 reginwide..Its going to snow a few inches minimum..If the coastal gets going quicker and closer in,,then we can start talking Ukie like totals..if not it's a 3-5 type event

Even back to here?

-skisheep

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is run from the models below but not sure if it's based on 18Z's or other data

 

 

§10 NAM-Eta members
§5 Regional Spectral Model (RSM) members
§6 WRF members

That info is incorrect...they totally changed the members last year.

 

Earlier we were discussing how they initialize. I believe it is from the 3hr prog of the most recent NAM run, but there may be some GFS/RR input as well.

 

The SREFs shouldn't make anyone jump though. Let's wait for the rest of the 00z suite first.

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That info is incorrect...they totally changed the members last year.

 

Earlier we were discussing how they initialize. I believe it is from the 3hr prog of the most recent NAM run, but there may be some GFS/RR input as well.

 

The SREFs shouldn't make anyone jump though. Let's wait for the rest of the 00z suite first.

 

Yeah, sorry about that, below are the changes:

 

1.  Remove two of the four models currently used in the SREF: the

Eta and the Regional Spectral Model (RSM). A new model will be

added: the Non-hydrostatic Multiscale Meteorological Model on the

B grid (NMMB).

 

2.  Upgrade two Weather Research and Forecasting (WRF) model

cores in model version from WRF v2.2 to WRF v3.3: Non-hydrostatic

Multiscale Meteorological Model (NMM) and Advanced Research 

WRF (ARW).

 

3.  Increase the NMM and ARW horizontal resolution from 32/35km

to 16km. The NMMB will also have a 16km horizontal resolution.

 

4.  Increase the number of WRF members for NMM and ARW from 5 

to 7. There will be 7 members for the new NMMB model. The naming

convention of all the files will follow the pattern:

sref_MODEL.tCCz.pgrb???.PERT.fxx, where MODEL is nmm, em, nmb

for the NMM, ARW and NMMB, respectively, CC is the model cycle

(03, 09, 15, 21), ??? is the number of the grid the data are on,

PERT is the perturbation, represented by ctl, n1, p1, n2, p2, n3,

p3, and fxx is the forecast hour.

 

5.  Increase diversity by selecting physic schemes used in

existing models: NAM, GFS, NCAR, HWRF and Rapid Refresh (RAP).

 

6.  Increase Initial Condition (IC) diversity by:

    -Using RAP analysis as a control analysis for the ARW, NAM

     analysis used for the NMMB, and GFS analysis used for

     the NMM.

    -Mixing IC perturbation schemes by using a mix of the Global

     Ensemble Transform with Rescaling (ETR), regional Breeding

     and blending between the two.

     -Increasing the Land Surface Initial States (LSIS) diversity

      by using the LSIS from the NAM, GFS, and RAP.

 

7.  New capabilities will be added in post-processing SREF data:

    -Bias correction (by frequency matching) of the precipitation

     forecasts for both individual members and the ensemble mean.

    -Clustering with two methods, NCEP and University of Oklahoma,

     with output including a text table about each cluster's

     membership and size, a GRIB output of probability of each

     cluster, and a GRIB output of cluster products for the mean

     and spread of thirty-nine fields, as well as the

     probabilities for 2-meter temperature and 3hr-accumulated

     precipitation.

    -Performance ranking of each ensemble member, providing

     different weights for different members in both text and

     GRIB format.

    -Statistical surface down-scaling from 16km SREF to 5km NDGD

     grid using the 5km Real-Time Mesoscale Analysis (RTMA)

     fields.

 

8.  Modified the snow liquid ratio from being fixed at 10:1 to a

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Did the NAM ever have this storm?  Dr. NO jr?

Had something at 12z, not like everything else but the EURO, but I was right on the border of the .25 line which was going NE from me, and here it's flurries. It wasn't like the GFS, UKIE, or GGEM in showing a bomb though, if the GGEM and UKIE loose it in a few hours, it's over.(Although I think it is already for anything more than just an inch or two, although who knows)

-skisheep

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It's almost like the storm developing off of SC is the one to watch. The initial S/W causes the low that the 12z runs blew up to be further east, but now that the energy coming around the backside of the trough is stronger..this SC low is gaining steam. One stupid little kink in this trough means cirrus or 12".

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It's almost like the storm developing off of SC is the one to watch. The initial S/W causes the low that the 12z runs blew up to be further east, but now that the energy coming around the backside of the trough is stronger..this SC low is gaining steam. One stupid little kink in this trough means cirrus or 12".

 

 

Yeah its focusing on the 2nd wave, Nam is out to lunch

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