ForWarn II

Satellite-Based Change Recognition and Tracking

Weather

Weather Damage in the Ozark-St. Francis National Forest, AR

Mon, 05/18/2015 - 08:43 -- wchristie

ForWarn discovered an anomaly in the Ozark-St. Francis National Forest, Arkansas. A severe weather event harshly hit Mt. Magazine and the south slopes. High elevation trees were partially leafed out which were damaged by the hail streak. The behavior of this anomaly is consistent with severe weather damage in other areas, running linearly from southwest to northeast.

Mapping the urban phenological footprint

Wed, 03/18/2015 - 21:44 -- stevenorman
The start of greenup for a mixed urban-agricultural Minnesota landscape

Urban areas are renowned for their admixture of species and vegetation types that can change from one parcel to the next. Yards and woodland parks intermix with road medians--all of which may be dominated by an irregular mix of native and exotic trees, shrubs, herbs and grasses. In cities, the vegetation of nearly every block is compositionally complex.

The typical start of greenup on agricultural lands

Wed, 03/18/2015 - 09:56 -- stevenorman
ForWarn's start of green-up for croplands

Understanding the normal start of greenup for croplands is important because it provides a baseline to compare year to year conditions. The date of greenup for agricultural lands varies based on year-to-year climate factors, the unique responses of the specific crop or vegetation type planted, and farmers' management practices. For areas that need to be planted in the spring, wet late winters can delay planting. Cool springs can delay growth. Either can potentially influence seasonal growth and yield.

The typical start of greenup in natural vegetation

Tue, 03/17/2015 - 10:36 -- stevenorman
ForWarn's median date of start of greenup

The start of the annual growing season is among the most important climate-sensitive measures that Land Surface Phenology (LSP) products like ForWarn can provide. Warm temperatures can accelerate bud burst, and this can increase exposure to damaging spring frosts, as it did across the Southeastern US in 2007 and 2012. In natural areas, the timing of spring greenup can affect growing season duration and productivity. It can also affect the risk and impacts of disturbances, such as those from wind, hail and fire.

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.

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