Dekadal Rainfall Estimates

Accumulated rainfall during the most recent dekad based on estimates from the Climate Prediction Center Morphing technique.

Accumulated rainfall during the most recent dekad, which has been aggregated from daily estimates. Every month has three dekads, such that the first two dekads have 10 days (i.e., 1-10, 11-20), and the third is comprised of the remaining days of the month. Therefore, the length of the third dekad of each month is not consistent and varies from 8-11 days, depending on the length of the month.

Reference

Joyce, R.J., J.E. Janowiak, P. A. Arkin and P. Xie, 2004: CMORPH: A Method that Produces Global Precipitation Estimates from Passive Microwave and Infrared Data at High Spatial and Temporal Resolution. J. Hydrometeorology, 5, 487-503.

Dataset Documentation

Precipitation Estimates

Data
Daily precipitation estimates on a 0.25 x 0.25 deg. lat/lon grid
Data Source
Climate Prediction Center Morphing Technique (CMORPH)

Dataset

Access the dataset used to create this map.

How to Use the Dekadal Rainfall Analysis Tool

About the Tool

This tool enables users to view maps of satellite estimates of dekadal rainfall over areas within the range of the Desert Locust, from West Africa to South Asia. The tool uses Climate Prediction Center Morphing Technique (CMORPH) satellite-estimated precipitation data from December 2002 to the present. The data are updated every dekad (approximately every 10 days). This tool enables users to view maps of these data for customized time periods, and with overlays of state or provincial boundaries.

This tool can be helpful in seeing where recent rainfall has occurred that might support the growth of green vegetation that could attract Desert Locusts.

For further information about the relationship between satellite-estimated rainfall and Desert Locust activity, or if you have questions about how to interpret the data in this tool, please contact Pietro Ceccato (pceccato@iri.columbia.edu).

How to Use this Tool

To return to the menu page, click the "Locust" link at the top left corner of the page.

Click and Drag to Zoom in to a Region on the Map:

  1. Click the left mouse button at the upper-left corner of the region to which you would like to zoom.
  2. While holding down the mouse button, drag the mouse to the lower-right corner of the region to which you would like to zoom.
  3. Release the left mouse button. The map will redraw automatically.
Zoom Out to the Full Map Extent:
  1. Move your mouse over the map until you see several icons appear above the map.
  2. Click the icon representing a magnifying glass.
  3. The map will redraw automatically.
Overlay or Remove Administrative Boundaries on the Map:
  1. Move your mouse over the map until you see several icons appear above the map.
  2. Click the "Layers" icon.
  3. Select from among the labeled check boxes that appear to select the administrative boundaries of interest.

Change the Date of the Map:

Find the the date of the estimated dekadal rainfall map by moving your mouse over the map until you see several icons appear above the map. Ensure that the "Time" icon has been selected and a text box will appear above the map with the date inside.
  1. To step forward or backward by one dekad, click the corresponding arrow buttons to the left or right of the date text box, and the map will automatically refresh.
  2. To manually change the date of the map, type your date of interest into the text box. For dekadal dates type the range of dates represented by the dekad of interest, using a format such as "1-10 Jan 2008", and press "enter".

Please feel free to email us with any questions or comments.

Helpdesks

Contact help@iri.columbia.edu with any technical questions or problems with this Map Room, for example, the forecasts not displaying or updating properly.