Experimental NDVI product shows “green anomalies”

The early part of July featured tremendous rainfall anomalies associated with early tropical cyclone activity across south and west Texas, Mexico, up into Kansas.  The rainfall analysis from the NWS Advanced Hydrologic Prediction Service (FIG. 1) shows 30-day rainfall departures from normal in excess of 600% across portions of these areas.   Much of this precipitation fell after the first of July.

SPoRT’s experimental NDVI (Normalized Difference Vegetation Index) depicts the amount of greenness in photosynthetically active vegetation.  SPoRT began generating real-time 1-km resolution NDVI composites, updated daily since 1 June 2010, using MODIS swath data from Wisconsin.   A remarkable difference in the amount of greenness can be seen between 1 July and 19 July over these regions, as seen in FIGURES 2 and 3.  Notice the correlation between the increases in NDVI and the anomalies in precipitation, especially over south/west Texas.

FIG 1. 30-day percent of normal rainfall, ending 19 July 2010.

FIG 2. SPoRT MODIS 1-km NDVI composite, valid 1 July 2010.

FIG 3. SPoRT MODIS 1-km NDVI composite, valid 19 July 2010.

Leave a Reply

Please log in using one of these methods to post your comment:

WordPress.com Logo

You are commenting using your WordPress.com account. Log Out / Change )

Twitter picture

You are commenting using your Twitter account. Log Out / Change )

Facebook photo

You are commenting using your Facebook account. Log Out / Change )

Google+ photo

You are commenting using your Google+ account. Log Out / Change )

Connecting to %s