List of Articles Synoptic analysis

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  1 - Synoptic Analysis of Mashhad Severe Thunderstorms
  framarz khoshakhlagh mohammad hasan mahoutchi
  10.22034/jest.2020.31009.3947
  Introduction: Thunderstorms are one of the most destructive weather phenomena, and knowing the mechanism, development, and development of such storms can be of particular help in counteracting and mitigating the damage. Methodology: In the present study, thunderstorms More

  Introduction: Thunderstorms are one of the most destructive weather phenomena, and knowing the mechanism, development, and development of such storms can be of particular help in counteracting and mitigating the damage. Methodology: In the present study, thunderstorms with rainfall of more than 10 mm of Mashhad synoptic station in a 61-year statistical period (2010-1901) have been investigated. Thus, first the codes related to the occurrence of the thunderstorm phenomenon and then the precipitation of more than 10 mm related to the mentioned phenomenon were extracted and then the daily data of the average sea level pressure from the series of retrieved data series. NCEP / NCAR were harvested within 12 days. Finally, with the method of basic component analysis (PCA) and cluster analysis, sea level rotation patterns that played a role in the formation of thunderstorms were classified. Results and Discussion: The study showed that thunderstorms of the Mashhad region, has been created by two general patterns. The first pattern, in the SLP, formed the cell of the monsoon system over the country advocated hot and humid air needed for thunderstorm by motion of cyclonic and at the upper levels (850 and 500 hpa) the trough of westerly winds is located over the studied area that led to the thunderstorms occurrence. In The second pattern, the Sudan system expanded from southwest toward northeast and then passed over the Persian Gulf and the Sea of Oman, that led the humid advection into the study area and at the upper levels (850 and 500 hpa) trough of westerly winds is located over the studied area that provided dynamic rise and consequently led to thunderstorms. In both precipitation pattern, main source of moisture was the South Seas and the major factor of uplifting was the western trough. Manuscript profile
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  2 - Statistical analysis Synoptic Thunder storms Kohgiluyeh and Boyer Ahmad
  Hasan Lashkari Zahra Yarmoradi Hasan Mousavi
  negative and harmful actions damaged by natural disasters caused by climate change has been struggling.The most frequent and severe thunderstorms this type of risk is that a lot of products each year Agricultural production facility construction, many areas of the world More

  negative and harmful actions damaged by natural disasters caused by climate change has been struggling.The most frequent and severe thunderstorms this type of risk is that a lot of products each year Agricultural production facility construction, many areas of the world, causing human casualties And every year in our country's strength and weakness that we experience with this phenomenon. Kohgiloyeh due to the mountainous area of opportunity for the intensification and expansion of thunder storms is. n this study, severe thunder storms to explore Kohgiluyeh Boyer Ahmad, the code related to the storm Tndrydr period 1990 to 2010 the country was extracted Meteorological Organization. The sea level pressure data, geopotential height, humidity and omega of databases NCEP / NCAR downloaded software were traced GRADS. Finally, 70 of thunderstorms to investigate the source of moisture and synoptic factors causing these storms were selected and evaluated. The most severe cases were selected according to the criteria described in full detail. The results showed that the cause of the Thunder, the Sudanese system. Due to potential high humidity (due to the formation of the next hot water on the equator) and receive ample moisture from the warm seas of Oman and the Arabian and Red Sea are high potential energy. As a result of the release of considerable heat Badrrvy severe thunder storms on the province. It should be noted that the topography of the region in strengthening and intensification of these storms has been ineffective Manuscript profile
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  3 - Statistical analysis and synoptic spatial and temporal patterns of precipitation Chance of Thunderstorm (Case study: Zanjan)
  Abdullah faraji Mehdi Doostkamian Zahra safari
  Thunderstorm a weather phenomenon that due accompanied by thunder, lightning, wind and rain, intense search in addition to the positive impact that they can cause a lot of damage in different parts of the world. Due to the variety of weather conditions, the occurrence o More

  Thunderstorm a weather phenomenon that due accompanied by thunder, lightning, wind and rain, intense search in addition to the positive impact that they can cause a lot of damage in different parts of the world. Due to the variety of weather conditions, the occurrence of this phenomenon is observed in different regions. North West of the province, especially not immune from this phenomenon. To study the phenomenon in terms of statistical and synoptic data daily thunderstorms Thunder in the province of Zanjan synoptic stations in a 16-year period (2009-1994) were used. The results of this study showed that the average frequency of precipitation Thunder northern parts of eastern, central and south of the province with the highest coefficient of variation are also based on these areas. The eastern and western parts of the province had the lowest average and the lowest coefficient of variation Thunder also have. With this interpretation in the months of March and April are the months of heat transfer (Spring), are due to the warming of the Earth's surface and lower layers of the atmosphere (the rise of the sun during the day and close to the vertical) and high atmospheric moisture, instability and flow convection intensified under the right conditions, convective clouds grow and so will thunderstorms. Cold transitional season (autumn) also Frat cool air from higher latitudes to the southern temperate zones than the underlying causes of instability are required. However, due to the lower humidity in the fall than in the spring, the intensity of thunderstorms in the spring and autumn much less. Analysis results show weather maps at different levels-the most important synoptic systems represent the region on the tab of Mediterranean and the Black Sea and the Mediterranean and Red Sudanese have strengthened the role of the North West the country and the province. West winds around the landing position with the main cause of instability in the region Low pressure cut off by severe thunderstorms in the province. Manuscript profile
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  4 - Patterning and Synoptic Analysis of Heat Waves in Ardabil Province
  - Bromand Salahi mahnaz saber fatemeh vatanparast ghaleh jouq
  This research was carried out to identify heat waves in Ardabil province and analyze their synoptic patterns using an environmental-to-circulation method. For this purpose, the average daily maximum temperature data of Ardabil, Parsabad, and Meshkinshahr synoptic statio More

  This research was carried out to identify heat waves in Ardabil province and analyze their synoptic patterns using an environmental-to-circulation method. For this purpose, the average daily maximum temperature data of Ardabil, Parsabad, and Meshkinshahr synoptic stations were used in the statistical period of 1980-2020. The 95th percentile index was determined as a criterion for identifying a hot day, and its duration of at least 3 days was considered as the basis for defining a heat wave. Examining the trend of SLP, HGT, and Tmax of these waves showed that in the hottest days of heat waves, the trend of SLP is downward and the trend of HGT and Tmax is upward. Clustering of heat wave generation patterns based on reanalysis data of sea level pressure and geopotential height of 500 hectopascals using cluster analysis method and Ward's clustering method led to the identification of 5 clusters which were presented in two main groups. In the first pattern, low pressure at the sea level surface and high pressure in the mid-atmospheric level, and in the second pattern, the location of the studied area in the west of the pseudo-Omega blocking of western Russia at the level of 500 hectopascals were identified as synoptic factors of heat waves in Ardabil province. The common feature of both models is the high thickness of the atmosphere over the region on the days of this event Manuscript profile
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  5 - Synoptic Investigation of heavy rainfall led to flooding on January 11, 2020 in southern Sistan and Baluchestan
  Mahyar Ahadi Batool Zeynali Atefeh Hossini Sadr Amir Siah Sarani
  Heavy rains often lead to destructive floods, so discovering the prevailing pattern any climate system will allow for optimal analysis and forecasting. The present study was conducted to explain the synoptic of heavy rainfall leading to floods on 22 January 2020 in More

  Heavy rains often lead to destructive floods, so discovering the prevailing pattern any climate system will allow for optimal analysis and forecasting. The present study was conducted to explain the synoptic of heavy rainfall leading to floods on 22 January 2020 in southern Sistan and Baluchestan province. Maps of different levels of the atmosphere were analyzed before a day the flood. In order to accomplish this, the required data have been extracted from NCEP/NCAR affiliated with the National Organization of the Oceanography of the United States. In the next step, the geo-potential height, vorticity, omega, wind direction, wind speed, specific humidity, Moisture Flux Convergence maps and Hoff Miller diagram was drawn and analyzed. The results showed that settle of trough vorticity in Saudi Arabia zone in the middle of the atmosphere along with the jet core at the upper levels provided favorable conditions for unstable weather and ascent in the southeastern region of Iran, so that the omega reached 0.45 Pascal per second. Special humidity maps also showed that at the same time as the settle of trough vorticity in region, considerable moisture flowed from the Arabian Sea and the Persian Gulf to southeastern Iran. Therefore, rapid conversion of atmospheric moisture to precipitation in trough vorticity has been the main cause of heavy rainfall on the above day. Manuscript profile
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  6 - Intraction between East Khorasan Winds Regimes and Sistan 120 Days Winds
  Mahmood Khosravi Abbas Mofidi Roya PoorkarimBrabadi
  The main goal of this study is to investigate theinteractionbetween East Khorasan winds regimesand Sistan120 Days winds. The climatic data  of Synoptic stations used in the present study was obtained fromkhorasan razavi, khorasan jonobi and sistan and baluchestan m More

  The main goal of this study is to investigate theinteractionbetween East Khorasan winds regimesand Sistan120 Days winds. The climatic data  of Synoptic stations used in the present study was obtained fromkhorasan razavi, khorasan jonobi and sistan and baluchestan meteorological organizations. The statistical period is from 2000 to 2011.  To do synoptic analyses, the maps of sea level pressure, geopotential height of 850 Hectopascal level, wind direction and the relativevorticity were used. The sample  extract form  the daily wind velocity data base of Zabol station and include the fourteen days with the highest velocitywinds.  The results shows that the wind direction in the Khorasan Razavi province is from north. while, the direction changes toward Northwest as it arrives to Sistan plain. This change in the direction of wind is due tothe topographyand geographical location of thearea. The geopotential height maps shown that the main reasons for the winds of 120 days are thecore ofthe highpressureonthe Caspian Sea and the core of the low pressure in Pakistan. Moreover, strengthening the low pressure intensifies the winds Manuscript profile
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  7 - Mahabad Spring Freezing Forecasting, Using Synoptic Study
  A, Gandomkar
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