Arctic sea-ice decrease may suppress U.S. tornado activity in summer

The observed losses in  Arctic sea ice during the past decades have been linked to the relaxation of poleward thickness gradients (thus weakened zonal winds) and a slower eastward progression of Rossby waves in the upper-level, which help promote prolonged extreme weather conditions, such as heat waves, within the mid-latitudes (e.g., Francis & Vavrus, 2012). However, the background... Continue Reading →

June 2, 2018 – Preliminary data from NOAA’s Storm Prediction Center indicate that the U.S. had a record low number of tornadoes

The spring severe weather season for the U.S. (March - May) is finally over. We had 449 EF0 - EF5 tornadoes from Jan 1 to June 2, which is a record low number for the period and certainly well below the historical average during 2005 - 2015 (792). Recent studies have suggested that U.S. tornado... Continue Reading →

The boundary that separates the humid East US from the semi-arid West is shifting eastward

The 100th meridian bisects the Great Plains of the United States and effectively divides the continent into more arid western and less arid eastern halves and is well expressed in terms of vegetation, land hydrology, crops, and the farm economy. Here, it is considered how this arid–humid divide will change in intensity and location during... Continue Reading →

Highlights of the findings of the U.S. global change research program climate science special report

This executive summary presents the Fourth National Climate Assessment (NCA4), an authoritative assessment of the science of climate change, with a focus on the United States. This represents the first of two volumes of the Fourth National Climate Assessment, mandated by the Global Change Research Act of 1990. https://science2017.globalchange.gov/chapter/executive-summary/

US regional tornado outbreaks and their links to spring ENSO phases and North Atlantic SST variability

Recent violent and widespread tornado outbreaks in the US, such as occurred in the spring of 2011, have caused devastating societal impact with significant loss of life and property. At present, our capacity to predict US tornado and other severe weather risk does not extend beyond seven days. In an effort to advance our capability... Continue Reading →

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