Consecutive Wet Days
The number of consecutive wet days (CWD) is similar to the above CDD, the largest number of consecutive days with daily precipitation amount more than 1 mm (or depend on the rain days criteria of the country), within a certain time. Usually the process counts the number of days in the past 90 days to measure the wet level.
How it works
Calculate the number of rain days based on the threshold and calculate the count of the most recent days since a dry day or the most recent consecutive string of days that meet the threshold criteria is summed.
Option for rain day's threshold: 1, 2.5, 5, 10 or 20 milimeters of rainfall per day
IF previousCWD == null THEN previousCWD == 0
ELSEIF todayRAIN < 1 AND previousCWD == 0 THEN previousCWD + 1
CWD derived from IMERG data
About the data
| Characteristic | Description |
|---|---|
| Function | Display daily CWD |
| Variable | CWD |
| Geographic coverage | Global 60N-60S, 180W-180E |
| Spatial resolution | 0.1 degree ~ 11.1 km at equator |
| Temporal resolution | Daily |
| Format | GeoTIFF |
| Unit | Number of day |
Symbology
The threshold and the symbology for the CWD can follow below color codes and image.
| Class | Threshold | Hex | RGB |
|---|---|---|---|
| No Rainfall | 0 | #cccccc |
rgb(204, 204, 204) |
| Very Short | 1 - 5 | #ffffcc |
rgb(255, 255, 204) |
| Short | 6 - 10 | #c6e8b3 |
rgb(198, 232, 179) |
| Moderate | 11 - 20 | #7eccba |
rgb(126, 204, 186) |
| Long | 21 - 30 | #41b7c4 |
rgb(65, 183, 196) |
| Very Long | 31 - 60 | #2c80b8 |
rgb(44, 128, 184) |
| Extreme Wet | +60 | #253494 |
rgb(37, 52, 148) |
Data access
Global CWD data available at DEC S3: s3://wbgdecinternal-ntl/climate/products/cwd-imerg