Since then, the National Weather Service changed its warning guidelines.

For a second day the National Weather Service has issued a tornado watch for a large portion of Oklahoma.

美国国家气象局连续第二天向俄克拉荷马州大部分地区发出龙卷风警报。

The National Weather Service calls this storm system multifaceted.

美国国家气象局称这个风暴系统涉及众多方面。

The Earth is struck by lightning nearly 20 million times each year, and bolts of lightning can travel as much as 10 to 12 miles from a thunderstorm, instantly heating the air to 50000 degrees Fahrenheit6, according to the National Weather Service.

根据美国国家气象局的数据，地球上每年发生的闪电次数可达近2000万次，雷雨过程中闪电可行进10到12英里（16到19公里），瞬间让空气升温华氏5万度。

Wassila Thiaw studies Africa for the Climate Prediction Center at the National Weather Service in the United States.

Wassila Thiaw在美国国家气象局天气预报中心负责研究非洲的状况。

The National Weather Service says parts of Oklahoma, Arkansas and Missouri could say tornadoes.

美国国家气象局表示，俄克拉荷马州、阿肯色州以及密苏里州的部分地区可能会出现龙卷风。

The national weather service says 71% of the United States is covered by snow.

国家气象局表示，美国71%的国土被冰雪覆盖。

Rick Smith with the National Weather Service says the current situation is different.

国家气象局的瑞克·史密斯表示，现在的情况则完全不同。

Unusually low temperatures were in store for much of the nation into Friday, the National Weather Service said.

国家气象局说异乎寻常的低温会影响全国大部分地区并一直持续到周五。

But meteorologist David Beachler from the National Weather Service says not to worry.

但是国家气象局的气象专家大卫·贝赤勒表示并不需要担心。

The National Weather Service says more snow and freezing rain are on the way for Nebraska.

国家天气服务台预报内布拉斯州将会降临大雪和冰雨。

The National Weather Service says at least ten tornadoes touched down in the area.

美国国家气象局称至少10起龙卷风重创这一地区。

The aviation weather service is an important foundation of the civil aviation security. It is also an essential component of National Weather Service.

航空气象是保障民航安全运行的重要基础，同时也是国家气象的重要组成部分。

Your joints are more accurate than the National Weather Service.

你的关节比国家气象局对天气的预报还要准。

The National Weather Service is warning of a bitterly cold temperatures in some of the upper Midwest and Great Lakes states.

美国国家气象局警告称，上中西部地区和五大湖地区将迎来刺骨的严寒。

On the Construction of Bore Bottling Pile and the Change Rule of Ground Temperature of Its Surrounding Ground

钻孔灌注桩施工及其周围土层地温变化规律的探讨

Research on Effect of Filter Tube, Stop Water Heavy Curtain to Surrounding Ground Settlement

过滤管、止水帷幕对周边地面沉降影响的研究

An Analysis on Surrounding Ground Deformation and Ground/ Water Pressure Fluctuations Caused by A Super Large Diameter TBM

超大直径盾构推进引起周围土体变形和土水压力变化分析

Numerical Analysis on Stability of Surrounding Ground by means of Monitoring Results of Metro Works

地铁工程监测后稳定性分析的数据计算

Simulation Research on Soil Freezing Temperature Field Surrounding Ground Heat Exchanger

地埋管换热器周围土壤冻结温度场的模拟研究

Simulations on settlement of surrounding ground of deep excavation on pit

深基坑开挖周边土体沉降形态的模拟研究