ForWarn II

Satellite-Based Change Recognition and Tracking


Autumnal Hail and Early Browndown in the Upper Midwest

Tue, 11/04/2014 - 10:22 -- stevenorman
September 2014 hail storm streaks through northern Wisconsin

It can be challenging to detect disturbances during seasonal periods of transition such as Fall or Spring in the eastern deciduous forest. The baseline conditions we use to compare with current conditions harbor a lot of normal variation that results from the onset and progression of cold temperatures. In the upper Midwest, Fall is typically reflected by a gradual drop in NDVI during September, then a more rapid decline in October. By the beginning of November during most years, this decline in NDVI is largely complete.

Multiple Potential Threats in Lyon and Johnson Mtns, NY

Wed, 09/24/2014 - 11:51 -- wchristie

ForWarn identified anomalies in the Lyon and Johnson Mountains, New York. There are several possible causes for this event. Clouds may obstruct the detector providing a false anomaly, insects may be defoliating the area, the phenology of the plants could play a part in departure, or sever weather causing damage to foliage.


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