Abstract: chronology of cutoff lows (COL) from 1979 to 2014 alongside daily precipitation observations across the conterminous United States was used to examine the contribution of COL to seasonal precipitation, extreme-precipitation ...

Abstract: Planetary wave breaking (PWB) over the subtropical North Atlantic is observed over 45 winters (December 1958?March 2003) using NCEP?NCAR reanalysis data. PWB is manifested in the rapid, large-scale and irreversible overturning ...

Abstract: Forty-six years of daily averaged NCEP?NCAR reanalysis data are used to identify the occurrence of planetary wave breaking (PWB) in the subtropical upper troposphere. As large-amplitude waves propagate into the subtropics ...

Abstract: Summertime cloud-to-ground lightning strikes are responsible for the majority of wildfire ignitions across vast sections of the seasonally dry western United States. In this study, a strong connection between active phases ...

Abstract: pisodic surges of moisture into the southwestern United States are an important attribute of the North American monsoon. Building upon prior studies that identified mesoscale gulf surges using station-based diagnostics, ...

Abstract: A novel approach is presented to objectively identify regional patterns of climate variability within the state of California using principal component analysis on monthly precipitation and temperature data from a network ...

Abstract: bserved changes in climate of the U.S. Pacific Northwest since the early twentieth century were examined using four different datasets. Annual mean temperature increased by approximately 0.6°?0.8°C from 1901 to 2012, with ...

Abstract: he skill of two statistical downscaled seasonal temperature and precipitation forecasts from the North American Multimodel Ensemble (NMME) was evaluated across the western United States at spatial scales relevant to local ...