Abstract
Daily rain data for the selected stations were obtained from the Meteorological Organization of Iran for the 1985-1999 period. The consecutive rain days of length 1 to 5 days and widespread over the study area were extracted. The jet tracks and speed surges were extracted from the daily weather maps of IRIMO for the 54 selected rainy periods. The results showed that the wind speed does not affect the rain intensity. The jet tracks show negative curvature during the non and low rain days but strong positive curvature during the maximum rain day. The establishment of a deep trough during the intensive rain days caused the jet tracks to concentrate close to the study area.
Highlights
Jet streams are very important factors in the climate of an area
Jet streams exist as concentrated speed surges embedded usually in the westerly currents
The Polar Front Jet streams (PFJ) embedded in the mid to upper tropospheric westerlies, 500 to 300 hPa levels
Summary
Jet streams are very important factors in the climate of an area. They develop and steer the pressure systems and control the weather and climate. The PFJ embedded in the mid to upper tropospheric westerlies, 500 to 300 hPa levels The Polar Front Jet stream through the vertical motion controls the development of surface pressure systems and weather or in long run the climate. The Sub Tropical Jet stream located at the tropopause level over the subtropical region. Harman[3] has done a lengthy work about their location in the westerlies He has defined the jet location according to the monthly frequency of the daily wind maxima during the 1946-1987 period for the four mid season months of January, April, July and October. Weisman[11] studied the relation of jet stream location and the inverted trough over the United States.
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