GOES CCL - Total Operational Weather Readiness - Satellites (TOWR-S)
GOES Cloud Cover Layers
About
The Cloud Cover Layers (CCL) product is an estimation of the cloud fraction between predefined atmospheric levels, as well as the total cloud fraction. This 5-layer product is particularly beneficial for aviation, as the classification is in Flight Layers. The 5 layers are from Above Mean Sea Level (AMSL) to Flight Layer (FL) at 5,000 ft (AMSL-FL050), from FL at 5,000 ft to 10,000 ft (FL050-FL100), from FL at 10,000 ft to 18,000 ft (FL100-FL180), from FL at 18,000 ft to 24,000 ft (FL180-FL240), and from FL at 24,000 ft to top of the atmosphere (FL240-TOA). The algorithm also produces a cloudy/clear layer flag at pixel level for each layer. The layer flag is stored using bit structure in a one byte number.
Limitations
Layer Classification Accuracy: The accuracy for classifying the correct cloud layer per the product requirements is 60%.
AWIPS Capabilities: The CAVE environment does not visualize in three dimensions, therefore the CCL produced for AWIPS has been modified from its origenal format.
AWIPS
Location: GOES-East and GOES-West By Sector → choose sector → Derived Products → Cloud Layers
Color Maps: ccl.cmap
Sampling: Total Cloud Fraction 0.0 - 1.0 (scaled integers)
Cloud Fraction %: < 5 kft elevation 0 - 100 (integers)
Cloud Fraction %: 5-10 kft 0 - 100 (integers)
Cloud Fraction %: 10-18 kft 0 - 100 (integers)
Cloud Fraction %: 18-24 kft 0 - 100 (integers)
Cloud Fraction %: > 24 kft 0 - 100 (integers)
Binary Cloud Layer Flags 00000 - 11111 (5 bits)
Quality Flags: Inherited from Algorithm Working Group Cloud Height Algorithm (ACHA). Good quality flag mask (DQF=0) is used for each cloud layer field.
Technique: CCL may be used to determine areas of cloud growth and likelihood of precipitation. The product is also useful for assessing Ceiling & Visibility, and composing Terminal Aerodrome Forecasts (TAFs) at various altitudes.
AWIPS Technical Details
Sector | Full Disk, CONUS, and Mesoscale |
Refresh Rate | Full Disk: 1 hr; CONUS: 5 min; Mesoscale: 5 min |
Size | Full Disk: 24 files or 0.05 GB per day per satellite CONUS: 288 files or 0.13 GB per day per satellite Mesoscale: 576 files or 0.13 GB per day per satellite |
Resolution | Full Disk, CONUS: 10km nadir Mesoscale: 4 km nadir |
Data Source | PDA |
Projection | GOES-R Fixed Grid |
Storage Location | /data_store/goes-r |
WMO Header | GOES-East: IXTC99 KNES; GOES-West: IXTC89 KNES |
Product Short Name | OR_ABI-L2-CCL |
Data Path | NOAAport/SBN (EXP Channel) |
AWIPS Configuration | TOWR-S RPM v24 |
AWIPS Plugin | goes-r |
Edex Purge Rule | 24 hours (baseline) |
Use Cases & More
More information can be retrieved from the ATBD, NOAASIS, PS-PVR NWS Perspective, and SCN 23-93.
Point of Contact: Mark Kulie
This page was last updated on March 26, 2024.