ForWarn II

Satellite-Based Change Recognition and Tracking


Mudslide in Oso, WA

Mon, 12/15/2014 - 09:05 -- wchristie

ForWarn identified a former disturbance regarding the Oso, Washington mudslide in March 2014. The view of this event in the summer shows the background forest with minimal ephemeral change during this time of year. Weather was the cause of this event.

Hail Damage in WI

Tue, 11/04/2014 - 10:26 -- wchristie

ForWarn observed a substantial departure anomaly in portions of the Chequamegon-Nicolet National Forest and a portion of the Saint Croiz National Scenic Riverway, Wisconsin. The shape and behavior of the anomaly suggests straight line wind and hail damage. The storm moving through the area caused damage to deciduous trees who's branches were more susceptible to breakage, decreasing vegetation greenness.

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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