SREF-32 km Operational Change Log
Date |
Change |
Jif # |
12Z June 28,
2006 |
Implementation
of SREF 4x/day runs
In
addition to the current 09Z and 21Z runs, the script is being modified
to add off-time cycles 03Z and 15Z for SREF 21 member 87 hour
forecasts.
|
729-738 |
12Z June 20,
2006 |
Addition of
GEMPAK NCO Graphical products SREF_GEMPAK_GIF. (Sager,
NP12). New script gempak_srefgif3.sh creates five new sets of
Short Range Ensemble Forecast (SREF) model GEMPAK graphics for the NCEP
Model Analysis and Forecast website. The new graphics being
generated are Predominate
Precipitation Type, Probability of CAPE greater than 500, Probability
of 850mb Temperatures less than 0 Celsius, Probability of 2-meter winds
greater than 25 Knots, and Probability of 6 hour precipitation greater
than .25 inches. Script are also being changed to
create graphics for every three rather than six forecast hours and to
extend the graphics out to 87 hours.
exsref_post. (Du, NP2). This program produces ensemble products (mean, spread and prob) for the SREF. The cloud ceiling is being added as required by AWIPS. |
684-687 709 |
12Z June 13,
2006 |
Eta and WRF
member initialization from new NAM-WRF GSI analysis
SREF_PREP_GET_NDAS.SH - IBM Job exsref_prep.sh.sms. (Du and
Chuang, NP2). This program reads in high-resolution regional
analysis to covert it into lower-resolution for the SREF Eta
members. The program is being modified to interperate the WRF
restart file instead of the Eta restart fileEXSREF_WRFPERTURB.SH.SMS - IBM Job JSREF_WRF_REAL.sms.prod. (Du and Jovic, NP2). This program extracts land surface states from ndas to replace GFS's ones. The program is being modified to match the regional analysis (ndas) change (from Eta-based to WRF-nmm based). |
664-665 |
12Z June 6,
2006 |
Generation of
GRIB2 ensemble products SCRIPT
- JSREF_POST.sms.prod. (Vuong, NP11). Script
exsref_post.sh.sms produces the (mean, spread and probability) of
selected variables and writes them out in GRIB format. The script
is being modified to produce grids 212, 216 and 243 in GRIB2 format for
AWIPS from the SREF model.
|
592-594 |
12Z May 30,
2006 |
Use of
GEFS forecasts for init and Lateral boundary conditions for all members Jobs changed to point to Global Ensembl Forecast System (GEFS) directory and file name structure and for WRF: exsref_wrfprelim.sh.sms. (Du, NP2). This program runs WRF standard initialization (SI) for the WRF-NMM and WRF-EM model in the SREF. The following modifications are being implemented: (1) Global ensemble's directory name and file names are being modified to match the new glb ensemble output format. (2) a new pair of glb ensemble members is being assigned as LBCs to the 3 WRF ARW members for more diversity. |
535-539 |
12Z April
25, 2006 |
PARM FILE - IBM Job exsref_post.sh.sms. (Du, NP2). Parm file sref_product_variable.bl defines variables and product type that are calculated in the SREF ensemble product generator. Helicity, CIN and vorticity fields have been added back after they were mistakenly removed in the previous code upgrade for AWIPS. |
Crisis 356 |
12Z April
18, 2006 |
Inclusion
of additional ensemble product fields for AWIPS
EXSREF_POST. (Du, NP2). This program calculates ensemble products i.e. mean, spread and probability output GRIB files. The program is being modified to (1) add all missing variables required by AWIPS (requested by NCO); (2) change units from K to C for lifted index to avoid all zero probability values; and (3) correct an error to output the probability of snow only once, not twice. |
335, 336 |
12 Z March
21, 2006 |
WRF and RSM
members precip fix
SREF_WRFPOST - (Du, NP2). The program calculates ptype for RSM and WRF members in the SREF. Two errors are being corrected: (1) use instanteous precip rate now instead of 3hr-accumulated precip previously and (2) remove tiny precip rate values in the calculation to avoid too wide spread ptype areas from RSM members (a characteristic of spectral model) observed by SPC's forecasters. |
270 |
12 Z March
14, 2006 |
WRF & RSM
member Precip type fix
SREF_WRFPOST_SOURCE - (Du, NP2). This program determines the precip type category such as rain, snow, sleet or freezing rain. The program is modifying an error that caused incorrect dimensions in a few of the arrays, this lead to an increased bias for freezing rain category. |
256 |
12 Z
February 14, 2006 |
WRF ARW PBL
fix, Precip type algorithm improvement
The YSU PBL used in the WRF-ARW
members was corrected. This correction now allows ARW members to
maintain numerical stability with longer time steps (currently,
DT=108s, DX=45 km). Songyou Hong, KMA, provided the correction to limit
variables such as uflxpbl, vflxpbl to realistic values. High fluxes can
sometimes occur in response rare point instability caused by strong
vertical shear in the YSU PBL..An improved dominant precipitation type algorithm (developed by Geoff Manikin, EMC) was implemented in the ensemble product generator. The dominant type is derived by first computing precip types from various algorithms (eg: Baldwin, Rainer,...) and then determining the dominant precip type from each member and then for the whole ensemble. |
1XX 1YY |
12 Z
February 7, 2006 |
WRF member
optimization, ARW LSM fix, NMM non-hydro option
NAMELIST - IBM Job
exsref_wrffcst. (Du, NP2). This program defines how the
WRF_arw and nmm members are executed in SREF. The program was
modified to change the debug level from 5000 to 0 to speedup the
model run. Each WRF NMM and ARW member now run in
under 30 and 40 minutes respectively.ARW_SOURCE - IBM Job exsref_wrffcst. (Du, NP2). This is the NOAH land surface model used by ARW (EM) members in SREF. The program is being modified to; (1) to correctly initialize downward longwave radiation; and (2) to avoid dividing by zero in light snow condition. This change was recommended by NCAR/MMM to help control instabilities noted in NMM in the NE portion of the ARW domain near Greenland. SOLVE_NMM - IBM Job exsref_wrffcst. (Du, NP2). This program is the dynamical solver of WRF_nmm model used in SREF. The program is being modified to turn on the Non-hydrostatic option for the vertical velocity field. |
108,113 117
118 |
12 Z January
10, 2006 |
WRF-NMM nenbers
V2.0 GFDL radiation and BMJ convective physics fixes
RADIATION SOURCE - IBM Job sref_wrffcst. (Du, NP2). This
program is the radiation calculation code for the WRF_nmm model in
SREF. The program has been modified to add logic to prevent
downward surface solar insolation and shortwave potential temperature
tendencies from being overwritten when running the GFDL shortwave
radiation. CUMULUS SOURCE - IBM Job sref_wrffcst. (Du, NP2). This is BMJ cumulus paramerization code for the WRF_nmm model in SREF. The program has been modified to comment out 3 lines of code that inadvertently resulted in bypassing all of the shallow convection code. Vertical Motion fields added to SREF member GRIB files in addition to Omega |
CRISIS 29, 30 |
12 Z
December 28, 2005 |
WRF members
script
Script
exsref_wrfprelim.sh.sm executes the WRF SI job for SREF. The
script has been modified to not use date information in the
identification to real_input files (in order to avoid time confusion
during the transition from one year to another). |
CRISIS 5. |
2005 JIFS |
||
December 13,
2005 |
Eta Members
CAPE postprocessing
SREFETA_ETAPOST - IBM Job sref_eta_post. This program
calculates the Convective Available Potential Energy (CAPE). The
surface-based CAPE calculation is being revised based on SPC's
suggestion (now searches a depth based on surface pressure rather than
a fixed lowest 70mb previously). |
1160 |
December 6, 2005 |
|
? |
August
30, 2005 |
|
? |
August
16, 2005 |
ETA members SST
initial condition change
The SREF program to read in all Eta related
global and regional files including SST, snow, ndas and gfs data has
been modified to use the Real-time Global SST analysis data instead of
the 50km SST analysis, recently changed by NESDIS. |
CRISIS 679 |
June
28, 2005 |
Eta members
BUFR sound postprocessing
The bufr sounding station list was modified
to match the new operational RUC and NAM list. |
554 |
May
31,
2005 |
All SREF
members: Upgraded GFS ICs/LBCs
SREF system
modified to
initialize IC and LBCs with
upgraded GFS T382 system |
|
May
3, 2005 |
Eta members LSM
physics upgrade
New Land
surface
initialization codes added to SREF system to initialize SREF members
with upgraded NAM-12 LSM using
1 km land and soil type fields. |
|
March
14, 2005 |
Ensemble mean
FVS
(Forecast Verif. System) Files added to NCO processing |
226 |
March
8, 2005 |
The specific humidity(q) has been modified to
reset to a small value, when q = 0 (absolute dry in atmosphere) to
avoid a mathematical problem (divided by zero) in the initial condition
breeding or forecast process. |
221-223 |
February
22, 2005 |
NDAS scripts modified to save the 06z and 18z
cycles of the NDAS initial conditions to meet the proposed running SREF
4 cycles per day. |
170 |
January
3, 2005 |
Eta members
freezing level postprocessing: Fixed problems with freezing
level computations. |
2
Crisis |
2004
Changes
|
||
9/21/04 |
RSM-Post jobs changed to run post
simultaneously with model and therefore have outputs available
earlier |
823-824 |
8/17/04 |
SREF 32 improved physics
diversity and scaled breeding system implemented: Change Notice
|
654-681 |
SREF-48 km
Operational Change Log: 2001-2003
Date |
Change |
Jif # |
09/04/01 |
TheShort Range Ensemble
Forecasting (SREF) system consisting of ten members (five Eta
and five Regional Spectral Model (RSM) members) at a 48 km resolution
covering the Eta model domain with regional breeding for generating initial conditionperturbations was implemented. To enable product availability at approximately the same time as the operational Eta from 00Z and 12Z, the SREF runs will start three hours earlier (at 21Z and 9Z respectively) and run through 63 forecast hours with output available in Three hour intervals. Lateral boundary conditions are provided by the respective nine hour old global ensemble runs. |
|
01/22/02 |
Eta Members: Implemented new Ferrier Cloud physics |
|
08/06/02 |
Eta
Members: Updated land-sfc model heat flux
routines to prevent negative fluxes & precip |
|
07/08/03 |
Eta members: Corrected truncation program that outputs Eta-12 at 48 km resolution to read from new format Eta restart files |
|
09/16/03 |
RSM
Members: Modified RSM-Post to produce extra output levels (40) and
storm relative humidity, storm grid motion, 2m dewpoint temps,
and best cape fields in member grib files |
|
09/16/03 |
Eta
Members: Modified Grib post to produce
extra
cloud and convective output fields in member grib files Officially
Add 5
Eta-KF members to operational SREF system (now 15 members) |
|
09/16/03 |
Eta Members: Create individual Eta Bufr member files |
|
12/16/03 |
Common Products: Use of NCEP standard grib extension definitions for all SREF probabilistic products |
|
05/25/04 |
Corrected RSM member winds to be relative to true north. Corrected RSM Helicity sign error |
SREF-32 Physics Diversity/scaled breeding
Parallel System Change
Log
Summer 04 Implementation
Date |
Change |
Impact |
11/01/03 |
Began Testing on Enhanced Physics Diversity System 1 Control run: Eta-Ferrier Shallow Convective param (FSC) 7 perturbed pairs(p,n) run with operational SREF unscaled breeding: 32 km: (PAR-04A) 2 Eta-BMJ, 2 Eta-KF, 2 RSM-SAS 2 Eta-SAT, 2 Eta-DET, 2 RSM-RAS, 2 Eta-RAS |
Too much spread, esp 1/2/04 run |
12/18/03 |
Reduced RSM member resolutions to 40 km to fit in operational window |
|
1/22/04 09Z |
Turned breeding perturbation off for all 10 Eta perturbed members. LBC perturbations kept on. RSM members, breeding turned off, but different Ic’s used from GFS ensemble |
Spread too small |
1/30/04 09 Z |
Turned breeding perturbation on using GFS & WRF scaled perturbation system. Used average 850 mb T standard deviation (0.5 C) to scale IC perturbations. IC perturbation scale = 0.5/ D Where D=Fneg-Fpos of the 12 hour domain avg 850 mb T forecast. |
Reasonable spread (48h forecast) : 1/30/04 à BMJ-SAT, RSM-RAS too wet 1/31/04 à RSM-RAS too wet, BMJ-SAT |
2/3/04 21 Z |
Reduced membership diversity: (Par-O4B): 4 perturbed pairs 3 Eta-BMJ, 3 Eta-KF, 3 RSM-SAS, 3 RSM-RAS 1 Eta-Sat, 1 Eta-DET, 1 Eta-RAS |
2/4/04 21z à 2/5/21z : did not complete. 2/13-2/16/04 à Did not complete Not enough spread..esp on low precip amts |
3/3/04 21Z |
PAR-04C less control runs: 6 perturbed pairs 3 Eta-BMJ, 3 Eta-KF, 3 RSM-SAS 2 Eta-SAT, 2 Eta-DET, 2 RSM-RAS |
Improved forecast variance with small effects on skill |
3/12/04 21z |
Increased Eta nphysics frequency call to every other time step (180 sec) Except for KF members where physics are called every time-step |
Reduced Eta RH bias at upper levels |
4/5/04 21z |
Fixed RSM wind output to be true rather than grid relative. Corrected helicity sign error. |
|
4/12/04 21z |
Changed BMJ-SAT saturated moisture profile to a dryer moist profile |
Done to account for very high BMJ-SAT precip biases and low KF-Det precip scores |
6/10/04 21z |
Corrected error in BMJ-SAT run where convective param was turned off Changed KF-DET to allow for ½ instead of full convective cloud detrainment |
Improved BMJ-SAT over-prediction biases. |
|
|
|
|
|
|
|
Member |
PAR-A |
PAR-B |
PAR-C |
Eta-BMJ |
2 (p,n) |
3 (c,p,n) |
3(c,p,n) |
Eta-KF |
2 |
3 |
3 |
RSM-SAS |
2 |
3 |
3 |
RSM-RAS |
2 |
3 |
2 |
Eta-SAT |
2 |
1 |
2 |
Eta-DET |
2 |
1 |
2 |
Eta-RAS |
2 |
1 |
|
Eta-FSC |
1 (c) |
|
|
|
|
|
|
Eta-BMJ type memb 5 |
4 (2 sat) |
4 |
5 (2 sat) |
Eta-KF type memb 5 |
4 (2 det) |
4 |
5 (2 det) |
RSM-SAS 5 |
2 |
3 |
3 |
RSM/Eta-RAS |
4 |
4 |
2 |
# perturbed members 12 |
14 |
8 |
12 |