عنوان مقاله [English]
Atmospheric and climate risks are the most destructive and the deadliest natural disasters around the world which lead to life destruction, financial and social losses.(neutral,1999).
Materials and Methods: In this study, daily maximum temperature data from 10 synoptic stations for April to September in khorasan razavi during the period (2010, 1987) and the annual, seasonal and monthly examined. At the time of heat waves in Khorasan using the 95th percentile indicator, temperature thresholds separately for each station of the year (2010, 1987) annually, quarterly or monthly revealed then the frequency of the number of days that were greater than the maximum temperature of the ninth percentile data for each of the annual, quarterly and monthly examined. Also in this study, the 1990 and 2000 season spring and summer stations Khorasan study compared the spatial continuity of the three-day heat waves and more temperature exceeds 95 (Gosling et al, 2007: 525-540) station Khorasan Razavi annual, seasonal specific zoning maps were prepared.