# Presentation: 947803

## Review of NAEFS Variables

**NAEFS workshop Oct 6-8 2008, NCEP**
**Lewis Poulin, MSC-CMC**
**Implementation. and Operational services**
_**[lewis.poulin@ec.gc.ca](mailto:lewis.poulin@ec.gc.ca)**_
**With information and assistance provided by:**
**Normand Gagnon, MSC-CMC**
**Dick Wobus, Yuejian Zhu, NCEP**

## Latest set of NAEFS expanded dataset (October 2008)

| Variables | NCEP: Pgrba file  / CMC: naefs file | Total 78(26) |
| --- | --- | --- |
| GHT | Surface, 10, 50, 100, 200, 250, 500, 700, 850, 925, 1000hPa | 11 (3) |
| TMP | 2m, 2mMax, 2mMin, 10, 50, 100, 200, 250, 500, 700, 850, 925, 1000hPa | 13 (3) |
| RH | 2m, 10, 50, 100, 200, 250, 500, 700, 850, 925, 1000hPa | 11 (3) |
| UGRD | 10m, 10, 50, 100, 200, 250, 500, 700, 850, 925, 1000hPa | 11 (3) |
| VGRD | 10m, 10, 50, 100, 200, 250, 500, 700, 850, 925, 1000hPa | 11 (3) |
| PRES | Surface, PRMSL | 2 (0) |
| PRCP-NCEP | Categorical: APCP, CRAIN, CSNOW, CFRZR, CICEP | 5 (0) |
| PRCP-CMC | Cummulative from 00hr: Rain, Snow, Freezing rain, Ice pellets |  |
| FLUX (surface) | LHTFL, SHTFL, DSWRF, DLWRF, USWRF, ULWRF 
(CMC-cmltv, NCEP 6hr avg) | 6 (6) |
| FLUX (top) | ULWRF (OLR)  (CMC-cmltv, NCEP 6hr avg) | 1 (1) |
| PWAT | Total precipitable water at atmospheric column | 1 (0) |
| TCDC | Total cloud cover at atmospheric column  (CMC instantaneous, NCEP 6hr avg) | 1 (0) |
| CAPE | Convective available potential energy | 1 (0) |
| SOIL | SOILW(0-10cm), WEASD(water equiv. of accum. Snow depth), SNOD(surface), TMP(0-10cm down) | 4 (4) |
| NCEP Notes | Surface GHT is only in analysis file and first pgrb file when the resolution changed.
23 of 26 new variables are from pgrbb files, 10, 50hPa RH and SNOD are new variables |  |

- _Latest set of NAEFS expanded dataset (October 2008)_

## NAEFS expanded variables dataset

| Variables | NCEP: Pgrba file  / CMC: naefs file | Total 78(26) |
| --- | --- | --- |
| GHT | Surface, 10, 50, 100, 200, 250, 500, 700, 850, 925, 1000hPa | 11 (3) |
| TMP | 2m, 2mMax, 2mMin, 10, 50, 100, 200, 250, 500, 700, 850, 925, 1000hPa | 13 (3) |
| RH | 2m, 10, 50, 100, 200, 250, 500, 700, 850, 925, 1000hPa | 11 (3) |
| UGRD | 10m, 10, 50, 100, 200, 250, 500, 700, 850, 925, 1000hPa | 11 (3) |
| VGRD | 10m, 10, 50, 100, 200, 250, 500, 700, 850, 925, 1000hPa | 11 (3) |
| PRES | Surface, PRMSL | 2 (0) |
| PRCP-NCEP | Categorical: APCP, CRAIN, CSNOW, CFRZR, CICEP | 5 (0) |
| PRCP-CMC | Cummulative from 00hr: Rain, Snow, Freezing rain, Ice pellets |  |
| FLUX (surface) | LHTFL, SHTFL, DSWRF, DLWRF, USWRF, ULWRF 
(CMC-cmltv, NCEP 6hr avg) | 6 (6) |
| FLUX (top) | ULWRF (OLR)  (CMC-cmltv, NCEP 6hr avg) | 1 (1) |
| PWAT | Total precipitable water at atmospheric column | 1 (0) |
| TCDC | Total cloud cover at atmospheric column  (CMC instantaneous, NCEP 6hr avg) | 1 (0) |
| CAPE | Convective available potential energy | 1 (0) |
| SOIL | SOILW(0-10cm), WEASD(water equiv. of accum. Snow depth), SNOD(surface), TMP(0-10cm down) | 4 (4) |
| NCEP Notes | Surface GHT is only in analysis file and first pgrb file when the resolution changed.
23 of 26 new variables are from pgrbb files, 10, 50hPa RH and SNOD are new variables |  |

- _NAEFS expanded variables dataset_

## Managing NAEFS variables - some considerations

- How will increase in no. of variables impact file sizes, operational timings?
- If timings are impacted
- High and low priority variables?
- High and low priority exchange files?
- Delay products because we are waiting for low priority variables?
- Manage differences for same variables between centers:
- Variables covering different intervals between centers
- Ex: APCP, Flux   (CMC cumulative, NCEP /6 hour)
- TCLD (CMC: Instant cloud cover, NCEP: 6 hour average)
- Do we want variables to converge to same definitions (eventually) for all centers
- Consistency of coding in GRIB2 between centers
- Testing of GRIB2 encoding/decoding can be time consuming
- NCEP standard, vs WMO grib2 standard
- Document clearly for users

## Managing NAEFS variables - some considerations

- Adding variables to dataset not always easy
- Manage expectations, requirements via a list, well documented
- What are short, mid and long term goal for variables?
- May take long periods of time to add variables that require in house development work to make those available
- ?? What if ?? implement new variables same time each year?
- Adding variables at set times may make it easier to plan for
- Of course can add variables any time if ready, otherwise set times
- Each center has variables expert and contact person
- CMC – Normand Gagnon, NCEP: Dick Wobus
- Other centers should ID their ‘variables’ expert
- See additional info of previous work on next slides

## Previous work on variablesNew NAEFS Variables

**Variables in or available to be added to GEFS for NAEFS exchange**
**GEFS status on Jan. 16, 2008 (D. Wobus)**
**CMC status on Mar. 20 2008 (N. Gagnon)**

## Proposed NAEFS variables 1 of 4

| Request | In pgrbb files (Production) | In pgrbd files (Experimental) | CMC
Via Direct model outputs | CMC
Via Post-processing |
| --- | --- | --- | --- | --- |
| Helicity 0-1km, 0-3km |  | HLCY 0-1Km
HLCY 0-3Km | No | No |
| Wind Shear 0-6km |  |  | No | No |
| 10M Wind Max
(max over 6 or 12hr interval?) |  |  | No | No |
| Surface Wind Gust |  | GUST at forecast hour | No | No |

## Proposed NAEFS variables 2 of 4

| Requested | In pgrbb files (production) | In pgrbd files (experimental) | CMC
Via Direct model outputs | CMC
Via Post-processing
 |
| --- | --- | --- | --- | --- |
| U, V, T, RH at 100, 50, 10 hPa | U, V, T at 100, 50, 10; RH at 100 hPa | RH 50, 10 hPa | Yes, but 10 hPa is our model lid. | - |
| Dew Point at 2m | DPT at 2m |  | Yes | - |
| CIN | CIN sfc, 0-180 from sfc | CIN 0-90mb and 0-255mb | No | No |

**Proposed NAEFS variables 2 of 4**

## Proposed NAEFS variables 3 of 4

| Requested | In pgrbb files (production) | In pgrbd files (experimental) | CMC
Via Direct model outputs | CMC
Via Post-processing
 |
| --- | --- | --- | --- | --- |
| surface latent, sensible, SW, LW fluxes | LHTFL, SHTFL, DSWRF, USWRF, DLWRF, ULWRF
at sfc
(interval average) |  | LHTFL, SHTFL (instantaneous “FV”,”FC” and 6 hour average,”AZ”,”AY”) DSWRF, DLWRF (instantaneous, “FB”,”FI”, total accumulation, “N4”,”AD”)
  | DSWRF, USWRF DLWRF, ULWRF
(6 hour interval) |
| OLR | ULWRF at top
(interval average) |  | ULWRF (instantaneous, “EI”, accumulation, “AR”) | ULWRF
(6 hour interval)
 |

**Proposed NAEFS variables 3 of 4**

## Proposed NAEFS variables 4 of 4

| Requested | In pgrbb files (production) | In pgrbd files (experimental) | CMC
Via Direct model outputs | CMC
Via Post-processing
 |
| --- | --- | --- | --- | --- |
| Snow | WEASD (liq. equiv.)  | SNOD (depth) | Yes, but for half of members it is a constant during the integration. “I5”,”SD” | - |
| Soil variables | TMP
SOILW (frac. water)
(0-10cm, 10-40cm, 40-100cm, 100-200cm) |  | Yes, for half of the members the soil moisture is constant. For the other half we have the 0-10cm layer but not the other ones.”I0”, ”I1(1)”in m3/m3 | - |

**Proposed NAEFS variables 4 of 4**

## Proposition of CMC

- U,V,T,RH at 100 ,50 and 10 hPa; i.e. wind, temperature, relative humidity
- DPT at 2m; i.e. dew-point
- LHTFL, SHTFL (total accumulation); i.e. surface latent and sensible heat flux
- DSWRF, DLWRF (total accumulation); i.e. down surface short and long wave radiation
- OLR (total accumulation); i.e. outgoing long wave radiation
- WEASD, SNOD; i.e. snow water equivalent and snow depth
- Temperature and soil moisture at level 1 (0-10 cm)
*BLUE=available via TIGGE*