1. Larry Burch, WAFC Washington Nigel Gait, WAFC London
Web-Based Graphical Output of WAFS Gridded Icing, Turbulence, Cumulonimbus Cloud .
Larry Burch, WAFC Washington
Nigel Gait, WAFC London
WAFC Science Meeting April 2009 Washington DC.

2. WAFS Gridded ICE, TURB, CB
Three Output Components
GRIB2
The full product suite
Web-based graphics
Limited set of products
“High-at-a-Glance”
Minimum set of products
WAFC Science Meeting April 2009 Washington DC.

3. WAFC Science Meeting 20-21 April 2009 Washington DC.
GRIB2 Data Set
Everything currently in GRIB1,
i.e., Wind, Temp, Humidity, Trop Height , Max Wind,
Plus
Icing, Turbulence, Cumulonimbus Cloud.
WAFC Science Meeting April 2009 Washington DC.

4. GRIB2 Full Product Suite
3 hourly time steps forecasts:
6,9,12,15,18,21,24,27,30,33 and 36 hours.
3 additional level for wind/temp:
FL 270, 320 and 360.
1.25 degree resolution. (regular grid = unthinned)
Issued 4 times per day, based on 00Z, 06Z, 12Z, 18Z model runs.
Note: Current WAFS GRIB1 product suite to remain unchanged.
WAFC Science Meeting April 2009 Washington DC.

5. GRIB2 Full Product Suite
Icing (mean and max) hPa thick layers centered at:
800hPa (FL060), 700hPa (FL100), 600hPa (FL140), 500hPa (FL180), 400hPa (FL240) and 300hPa (FL300).
CAT (mean and max). 50 mb thick layers centered at:
400hPa (FL240), 350hPa (FL270), 300hPa (FL300), 250hPa (FL340), 200hPa (FL390) and 150hPa (FL450)
In-Cloud Turbulence (mean and max). 100 mb thick layers centered at:
700hPa (FL100), 600hPa (FL140), 500hPa (FL180), 400hPa (FL240) and 300hPa (FL300).
CB Cloud:
Horizontal extent, Bases, Tops.
WAFC Science Meeting April 2009 Washington DC.

6. Web-Based Graphical Output of gridded ICE, TURB, CB.
Primarily intended for WAFS users in Least Developed Countries.
Web-based output is a partial set of the full GRIB2 suite.
630 products, 4 times a day.
WAFC Science Meeting April 2009 Washington DC.

7. 630 Products (pending approval by WAFSOPSG/5)
Valid times: 6, 9, 12, 15, 18, 21, 24 hrs.
(Full GRIB2 suite contains 27, 30, 33, and 36 hrs).
Mean icing:
700 hPa and 600 hPa (FL100 and 140).
Mean CAT:
300 hPa, 250 hPa, 200 hPa (FL300, 340, 390)
CB Horizontal Extent, Contoured Tops.
Standard ICAO chart areas.
WAFC Science Meeting April 2009 Washington DC.

8. CB Cloud Extent Isolated, Occasional, Frequent
DRAFT
ISOL
OCNL
FRQ
WAFC Science Meeting April 2009 Washington DC.

9. Draft CB Cloud Contoured Tops
Possible Height Scale
200
250
310
370
430
480
WAFC Science Meeting April 2009 Washington DC.

10. WAFC Science Meeting 20-21 April 2009 Washington DC.
High-at-a-Glance SIGWX (Concept - Beta version) (Final version pending approval by WAFSOPSG/5)
Outcome from WAFSOPSG/4
Conclusion 4/14 b) design the gridded forecasts with a high “at a glance” value;
Note. The gridded forecasts do not have to replicate the existing SIGWX forecasts; however, they must provide the same ease of use.
WAFCs propose combining a limited set of gridded IC/TURB/CB elements with Jet Stream.
Suitable for Flight Documentation ?
WAFC Science Meeting April 2009 Washington DC.

11. WAFC Science Meeting 20-21 April 2009 Washington DC.
High-at-a-Glance
WAFCs propose the “high-at-a-glance” contain two parts.
High-at-a-glance for SIGWX at High Levels (HG-SWH)
High-at-a-glance for SIGWX at Medium Levels
Drift-down emergency
Loss of cabin pressure
Single-engine operations
WAFC Science Meeting April 2009 Washington DC.

12. High-at-a-Glance HIGH Level En-route Cruise
CB Cloud extent,
CAT:
FL ,
Jet Stream:
FL340
>80 kts
DRAFT
WAFC Science Meeting April 2009 Washington DC.

13. High-at-a-Glance MEDIUM Level Drift-down Emergency
Icing potential
FL 100 – 140
Layer
CB Cloud extent
DRAFT
WAFC Science Meeting April 2009 Washington DC.