Abstract: One of the signals expected with greenhouse warming is a change in what are now considered extreme temperatures. In this paper one type of extreme is examined for the 1948-99 period, that is, a change in the number of days ...

Abstract: Observations of thunderstorm events by mouth for the period 1948?77 at 106 stations in the central United States are used to examine persistent spatial patterns in thunderstorm occurrence. A principal components analysis ...

Abstract: Starting times of thunderstorms for 450 stations in the conterminuos United States for a 25-year period were analyzed using harmonic analysis techniques. Diurnal variations were expressed as both the time of maximum storm ...

Abstract: The biases and large-scale inhomogeneities in the time series of measured precipitation and snowfall over the United States and Canada are discussed and analyzed. The spatial statistical characteristics of monthly and ...

Abstract: Africa remains an area of relatively little analysis of long-term variability and trends in climate extremes. In February 2001 a workshop on developing climate indices using daily climate data was held in Casablanca, ...

Abstract: he authors examine recent changes in three agro-climate indices (frost days, thermal time, and heat stress index) in North America (centered around the continental United States) using observations from a historical climate ...

Abstract: A Monte Carlo analysis was used to assess the effects of missing data and limited station density on the uncertainties in the temporal variations of U.S. heavy precipitation event frequencies observed for 1895?2004 using ...

Abstract: This paper describes the results of an analysis of trends in short duration (1?7 days) extreme precipitation events that have a recurrence interval of 1 yr or longer for stations in the United States and Canada. This ...

Abstract: At the National Climatic Data Center, two basic approaches to making homogeneity adjustments to climate data have been developed. The first is based on the use of metadata (station history files) and is used in the adjustments ...

Abstract: The diurnal temperature range (DTR) at weather observation stations that make up the U.S. Historical Climatology Network was evaluated with respect to the predominant land use/land cover associated with the stations within ...