The definitions of extremes indices are available online at http://eca.knmi.nl/indicesextremes/indicesdictionary.php. Days with RR > R95p are referred to as ‘very wet’ days and days with RR > R99p are ‘extremely learn more wet’ days. Percentiles were found for the cold and warm seasons

and for the whole year. The cold season is defined as lasting from November to April and the warm season from May to October. We divided the year into two seasons in this way on the basis of the analysis of percentiles of monthly precipitation distributions. The one-month shift of the beginning of the seasons compared to the astronomical ones can be explained by the inertia in the sea surface temperature Z-VAD-FMK and consequent evaporation and atmospheric humidity levels. Once the percentiles had been found, values exceeding those thresholds were counted for each

season and each year. We investigated the temporal variability of precipitation extremes by assessing linear trends in R95 and R99. We assessed trend significance in extreme precipitation events with the Mann-Kendall test and used Sen’s method to estimate slope ( Salmi et al. 2002); this latter method is applicable in cases where the trend is assumed to be linear. To obtain the slope estimate Q, the slopes of all possible value pairs in the data equation(1) Qi=xj−xkj−kare calculated. Here j > k. For n values of xi in the time series we get N = n(n – 1)/2 slope estimates. The Sen slope estimator is the median of these N values of Qi. These values are then ranked from the smallest to the largest, and the Sen slope estimator is Q=Q[(N+1)/2],ifNisoddQ=Q[(N+1)/2],ifNisoddor equation(2)

Q=12(Q[N/2]+Q[(N+2)/2]),ifNiseven. The results given in Table 1 (see page 252) are the slope estimator multiplied by one hundred to obtain the slope percentage for the whole period. Trends in extreme precipitation events were also found for three different regions in Estonia. Precipitation regionalization is a method for grouping meteorological stations with similar precipitation regimes. In this Etoposide price work we applied manual regionalization based on daily precipitation distribution percentiles. We separated Estonia into three regions – western, central and eastern. Figure 1a shows the geographical distribution of R99p in the cold season: three regions are clearly distinguishable – the western and eastern regions with lower threshold values and the central region (between them) with higher ones. The same geographical separation is valid for the distribution of the R95p for the cold season and for the whole year.