The storm formed over the Mediterranean Sea along the tail end of a very strong cold front.

風暴形成的地中海沿尾端的一個很強烈的冷鋒黄色片丝袜毒龙暴口一区二区。

The strong cold front that has been sweeping across most of north China over the past two days has brought a sharp temperature drop of up to 30 degrees centigrade to some hit areas.

過去兩天6080污一区二区在线播放，強勁寒流已經(jīng)席卷中國北方大部分地區(qū)，一些受災地區(qū)的氣溫急劇下降達到30攝氏度国产特黄A片AAA免费看。

"With the advent of the strong cold front, Beijing saw its first snow two months earlier than last year," said Guo Hu, head of the city's meteorological observatory.

北京市氣象臺Guo Hu說："冷空氣的到來91国在拍‖国语自产图片，使得北京第一次降雪比去年提前了兩個月"。

A Siberian strong cold front will affect China west to east in the following 2 days, bringing rain, snow and a fall in temperature, the National Meteorological Center forecast. Part of north China will be hit by strong wind and sandstorms.

據(jù)中央氣象臺預報欧美热精品视频在线播放，受西伯利亞強冷空氣影響狼友视频A级毛片，未來兩天，中國自西向東將有一次大范圍雨雪降溫過程亚洲色视频A片，北方部分地區(qū)還將遭受大風和沙塵天氣襲擊国产亚洲A∨片在线观看。

The results show that the formation mechanisms of the event are as follows.(1) The strong warm advection of 500hPa over the west Europe led to a blocking high created in Siberia area, and a zonal though, the north-east stream in the north edge of the though led to super polar cold air and the cold air from west together and got to strengthen, and then the abnormally strong cold high, front zone, cold temperature center and cold temperature advection appear.

結(jié)果表明：這次寒潮及寒潮天氣主要成因是(1)西歐上空500hPa強暖平流致使在西伯利亞地區(qū)形成阻塞高壓，建立橫槽插女人网站，橫槽北側(cè)的東北氣流引導超極地冷空氣和西路冷空氣合并加強久久久久精品久久；形成了異常強的冷高壓、鋒區(qū)AⅤ在线直接免费看、冷溫度中心和冷溫度平流AAA美女在线直播黄色。

The strong sandstorm was caused by squall line activity of eastern Hexi Corridor in Apr. to Jun. that was cold front, majority is in May, four times strong sandstorm is accompanied by the squall line in seven times. It was explained that the squall line was suggested easily when the strong cold front moved east to Hexi Corridor where special canyon tube terrain was in, the strong sandstorm which was created by squall line activity have very strong paroxysm that often created serious disaster.

河西走廊東部的颮線活動造成的強沙塵暴出現(xiàn)在4~6月，均為冷鋒型亚洲国产精品狼友，其中5月居多国产白色爽，出現(xiàn)的7次強沙塵暴中有4次伴有颮線，說明5月份強冷鋒東移經(jīng)河西走廊特殊峽管地形時易誘發(fā)颮線黄色网络站久久，颮線活動造成的強沙塵暴爆發(fā)性強，往往造成嚴重災情午夜免费A片。

A strong cold front penetrating into northern China will bring low temperatures, strong winds and scattered snowfall over the next three days, the central meteorological observatory forecast Sunday.

中央氣象臺20日預報国产1000黄色网站，受強冷空氣影響18禁黄无遮挡免费网站大全欲色，未來三天，北方將出現(xiàn)大風降溫和零星降雪天氣亚洲欧美福利一区二区精品。

The result shows that the strong sandstorm mainly appeared in Feb. to Jun., the strong sandstorm was caused mainly by momentum downloading gale of strong northwest air current before the high-pressure ridge in Jan. to Mar., the strong sandstorm was caused mainly by frontal area wind of cold air moving to southeast with ground cold front transiting.

發(fā)現(xiàn)強沙塵暴主要出現(xiàn)在2~6月国产三级视频在线18播放线观看，1~3月出現(xiàn)的強沙塵暴主要為高壓脊前強西北氣流動量下傳風所致；4~7月出現(xiàn)的強沙塵暴主要為冷空氣東移南下伴隨地面冷鋒過境鋒面大風所致欧美4p在线。

The result showed that the strong storm followed by mesoscale squall line was primary cause of strong sandstorm producing, steps and ladders short wave trough of 500 hPa was great criterion triggering system for the mesoscale squall line producing, the essential dynamic condition was provided by distortion field and the mesoscale low pressure of 700 hPa for the strong sandstorm forming and maintaining in mid-west of Hexi Corridor, the deep vertical circulation development condition was basic power that urged squall line to occur and sand dust to curl up, which was provided for the deep convection development by superimposition of lifting movement before ground cold front and ascendant current of secondary circulation in upper air jet entrance region, temperature and the barometric gradient around the cold front was enlarged by enhancement of ground thermal low and temperature diurnalvariation of afternoon, by which essential thermal energy unstable condition was provided for the gale and strong sandstorm eruption, the strong sandstorm appeared in downstream of -200 m^2s^(-2) center of vertical helicity, the vertical helicity had good instruction significance for development of squall line and landing region of sandstorm, the mesoscale squall line occurred in unstable stratification, basic condition of potential energy transforming as kinetic energy was provided by strong unstable stratification for the strong sandstorm forming and developing.

結(jié)果表明：中尺度颮線所伴隨的強風暴是產(chǎn)生強沙塵暴的主要原因；500 hPa階梯短波槽是中尺度颮線產(chǎn)生的大尺度觸發(fā)系統(tǒng)黄色工厂在线视频，河西走廊中西部700 hp變形場、中尺度低壓為強沙塵暴形成和維持提供了必要的動力條件99精品在线免费观看；地面冷鋒前上升運動與高空急流入口區(qū)次級環(huán)流的上升氣流的疊加插的太舒服在线视频，為深對流發(fā)展提供了深厚的垂直環(huán)流發(fā)展條件亚洲天天在线看视频，是促使颮線發(fā)生和沙塵卷起的基本動力国产在线小视频欧美看大片；地面熱低壓的加強和午后氣溫的日變化加大了冷鋒前后的溫度和氣壓梯度91性色在线观看www免费，為大風国产一级a爱看片免费视频、強沙塵暴爆發(fā)提供了必要的熱力不穩(wěn)定條件免费视频久久；強沙塵暴出現(xiàn)在垂直螺旋度為－200平方公尺/s^2中心的下游美女黄18以下禁止免费看，垂直螺旋度對颮線的發(fā)展和沙塵暴的落區(qū)具有較好的指示意義欧美特黄特级作爱大片亚洲性人人；中尺度颮線發(fā)生在不穩(wěn)定層結(jié)內(nèi)，較強的不穩(wěn)定層結(jié)為強沙塵暴形成亚洲黄片多人免费、發(fā)展提供了位能轉(zhuǎn)化為動能的基本條件偷拍偷窥第一页。

By using global reanalysis data from NCEP/NCAR,the durative of a floating dust over Beijing during 7-10 in April of 2006 was analyzed.It was found that the impact systems of the floating dust weather were West Siberia cold eddy,Okhotsk warm high and Tibetan Plateau high ridge at the level of 500 hPa;the dry-cold air at the level of 700 hPa transferred to Beijing ceaselessly,and the cold advection and baroclinic instability were strong,the gale and dust storm occurred in the strong cold advection area;the weak instability stratification in surface layer and mid-low level in the south of North China resulted in weak ascending air flow,then transported dust particles to Beijing depending on the easterly wind in front of the surface low pressure.

文章摘要：使用NCEP/NCAR再分析資料對2006年4月7-11日北京浮塵天氣過程的持續(xù)性進行分析国产洗澡网站，指出此次浮塵天氣過程主要受500 hPa西西伯利亞冷渦视频黄页在线播放免费、鄂霍次克海暖高壓以及青藏高原高壓脊影響av官方免费网站；700 hPa有干冷空氣不斷向北京地區(qū)輸送，冷平流和斜壓性都很強欧美aaaⅤ西西在线，大風和沙塵暴發(fā)生在強冷平流區(qū)域；由于華北南部地區(qū)近地面至中低層存在弱的不穩(wěn)定層結(jié)在线免费观看黄色av，容易產(chǎn)生弱的上升運動亚洲美女理论片在线免费观看。