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The Federal Aviation Administration has issued a safety alert about flying with dry ice onboard, in anticipation of the huge nationwide distribution project anticipated to start in the next few days once the Pfizer COVID-19 vaccine is approved for use.The Pfizer and Moderna vaccines both need to be kept at extremely cold temperatures, requiring the use of dry ice during transit.Dry ice is frozen carbon dioxide that is pressed into blocks or pellets. It doesn’t melt into a liquid, it moves directly from a solid to a gas and that process can happen quickly at high altitudes.That can cause problems onboard a plane, such as causing the plane to weigh less at times during the flight and change its center of gravity.“CO2 sensors installed or carried in the aircraft or worn by the pilots and other crewmembers will assist the operator and crew in recognizing hazardous concentrations of CO2 and implementing effective risk controls,” the FAA’s safety alert recommends.In addition, they encourage maximum ventilation onboard while on the ground and in the air, asking crewmembers to check air conditioning units and auxiliary power units before flight.Exposure to elevated levels of CO2 can cause drowsiness or dizziness, and higher levels can impact breathing eventually leading to hypoxia and death.The FAA also recommends that “pilot training on specific conditions and procedures can improve pilot decision-making in the event of a CO2 detector alert or other system abnormalities.”Friday morning, Health and Human Services Director Alex Azar said Americans could begin getting the COVID-19 vaccine next week once the FDA and CDC give it emergency use approval. 1676

The Environmental Protection Agency will allow states to set their own emission standards for coal-fueled power plants, the Wall Street Journal reported Monday. Critics say the decision will result in much more carbon dioxide being released into the atmosphere.The Journal reported that acting EPA Administrator Andrew Wheeler signed a proposal that calls for states to regulate emissions from power plants, undoing a move from President Barack Obama that made those emissions regulated by the federal government for the first time."The entire Obama administration plan was centered around doing away with coal," Wheeler told the Journal in an interview. 662

The fourth nor'easter in three weeks already is closing schools and canceling thousands of flights Wednesday as it's expected to dump record springtime snow in the Northeast.A day after the official beginning of spring, the storm will bring heavy snow, strong winds and even coastal flooding to some areas. It has potential to be one of the most significant and most disruptive snowstorms this late in the season, CNN meteorologists said."If the current forecast pans out, this nor'easter will dump more snow on Washington, Philadelphia and New York than the three earlier storms combined," CNN meteorologist Brandon Miller said.More than 70 million people are under a winter storm watch, warning or advisory from the southern Appalachians to Boston.The storm will move away from the region by Thursday but not without first hitting coastal New England and Maine.Latest developments? More than 4,100 flights are canceled Wednesday due to the storm, according to the tracking site Flightaware.com.? Public schools in New York City, Philadelphia and the District of Columbia are closed Wednesday.? The storm already dumped 13 inches of snow in Greencastle, Pennsylvania, and blanketed Smith Crossroads in West Virginia with 9.2 inches.Snow disrupting nation's capitalWashington will likely see 4 to 6 inches of snow, with some models hinting at much higher totals for the District. Areas west and north of the city are likely to see close to a foot of snow."It's been 75 years since Washington has had 5 inches of snowfall or greater this late in the season," Miller says.Track the storm with high resolution auto-updating graphicsThe inclement weather caused closures for much of the federal government. The White House and State Department canceled all public events for the day. However, the House and Senate are planning to work Wednesday as Congress tries to finalize a spending deal.Philadelphia could see up to a foot of snow. The City of Brotherly Love may get its biggest snowfall after the first day of spring in more than 100 years.For those in other parts of Pennsylvania, the storm was already well underway Wednesday morning. Thile Kreider posted an Instagram video of the snow blanketing her yard in Manheim.New York could break 1958 recordWind gusts and snow reached New Jersey and New York City on Wednesday morning. Ten inches to more than a foot is forecast in the New York City area before the storm departs early Thursday.But Central Park in Manhattan may only receive 4 to 6 inches of snow, CNN meteorologist Chad Myers said, explaining it's more likely snow will accumulate in areas at higher elevations."If New York gets 12 inches of snow -- the National Weather Service currently has a high-end potential of 13 to 21 inches -- it would be its largest snowfall ever recorded after the first day of spring," Miller says.The current record is 11.8 inches, set on March 21, 1958.With these late winter storms, it is difficult to predict snowfall amounts because of the mixing of warmer air. In some of the earlier nor'easters, the air near the ground has stayed warm enough that places like New York have seen lots of snow fall from the sky but had little accumulation. An urban heat island effect is plausible once again with this spring storm.Boston stayed on the warmer side in the first two nor'easters but then got walloped with snow during the third storm this month. The city is likely to see another 6 to 8 inches of snow, adding to the 20-plus inches it has already received in March.If Boston gets 10 inches, the city would have its third snowiest March on record.These late winter storms are likely to become more frequent with climate change. A study last week in the scientific journal Nature Communications ties extreme winter weather, specifically major snowstorms in the Northeast, to warming Arctic temperatures.Blizzard conditions likelyWith a forecast of heavy snow and winds more than 45 mph, blizzard conditions are possible.New York City could see sustained winds of 20 to 30 mph Wednesday, and coastal areas such as Cape Cod in Massachusetts are predicted to receive gusts up to 60 mph from midmorning Wednesday to Thursday.What is makes a snow storm a blizzardFlooding is a threat along the coast from Virginia to Massachusetts. Some of the worst coastal flooding could occur along the Jersey Shore, with high tides of 2 to 3 feet above normal possible.This will put a strain on already vulnerable coastal areas, which saw dramatic storm surges from the nor'easters over the last three weeks.The-CNN-Wire 4555

The Department of Homeland Security formally requested that the Pentagon extend the deployment of active-duty troops on the southern border Friday, potentially extending their deployment 45 days beyond the original deadline of December 15."Given the ongoing threat at our Southern border -- today the Department of Homeland Security submitted a request for assistance to the Department of Defense to extend its support through January 31, 2019," Department of Homeland Security spokeswoman Katie Waldman told CNN in a statement."This request refines support to ensure it remains aligned with the current situation, the nature of the mission, and (Customs and Border Protection) operational requirements," she added.The Pentagon confirmed receipt of the request but said Secretary of Defense James Mattis had yet to sign off on it:"We have received the Request for Assistance from the Department of Homeland Security, it is with the Secretary (of Defense) for consideration."There are currently some 5,600 troops at the border, divided among Texas, California and Arizona.President Donald Trump sent the troops after spending the weeks leading up to the midterm elections decrying a procession of migrants that was still thousands of miles from the US border. Last week, Trump granted the troops new powers to aid in "crowd control, temporary detention and cursory search" while protecting Customs and Border Protection personnel from the migrants, should they engage in violence.Defense officials have suggested that some of the troops, primarily engineers involved in enhancing infrastructure at points of entry, could be drawn down in the relative near term as those tasks are completed.Two officials tell CNN that the number of trumps assigned to the mission is likely to drop to 4,000 as a result.Other functions, including helicopter support to help move Customs and Border Protection personnel to different areas along the border, are likely to continue.The deployment's extension means the Pentagon's initial cost estimate of million for the border deployment is likely to increase as that estimate was based on the mission ending on December 15. 2175

The fine print of newly released federal guidelines for reopening schools raises serious questions about whether in-person classes should resume at a time when COVID-19 rages around much of the country.Last week, the Centers for Disease Control and Prevention (CDC), under pressure from the White House, released a position paper highlighting “the importance of reopening America’s schools this fall.”But separate guidelines issued for K-12 school administrators, which drew less public attention, are much more cautious.“It is important to consider community transmission risk as schools reopen,” those CDC guidelines state.“Computer simulations from Europe have suggested the school reopenings may further increase transmission risk in communities where transmission is already high.”Buried at the bottom of the new CDC recommendation to re-open schools is a HUGE caveat! #COVID19 poses a low risk to kids “at least in areas with low community transmission.” That’s not where much of the country stands right now. 4/ pic.twitter.com/0D5CPxhlIb— Phil Williams (@NC5PhilWilliams) July 25, 2020 The new CDC guidelines suggest, “If community transmission levels cannot be decreased, school closure is an important consideration.”“Plans for virtual learning should be in place in the event of a school closure.”In Tennessee, several public and private schools are preparing to reopen even as almost every county in the state is showing what the Department of Health considers to be unacceptable rates of transmission of the coronavirus.Last week, the American Academy of Pediatrics issued a dramatic clarification of its statement back in June that "all policy considerations for the coming school year should start with a goal of having students physically present in school.""This does not mean that we recommend that all schools open five days a week from the start of the school year," the academy’s Dr. Sean O'Leary told a congressional committee.“Many parts of the country are currently experiencing uncontrolled spread of COVID-19. While the AAP urges those areas to make in-person learning as the goal, we recognize that many jurisdictions will need to utilize distance learning strategies until cases decline."The vice chair of the academy's committee on infectious diseases, O'Leary told the subcommittee that, where there is uncontrolled community transmission, "it's inevitable that the virus is going to get into the schools, and schools are going to have to shut down."U.S. Surgeon General Jerome M. Adams also told CBS This Morning last week that a community's COVID-19 transmission rate is the single most important determinant of whether schools can safely reopen.School reopening advocates point to the emotional, psychological and educational importance of children being in the classroom – a position that the CDC guidelines reaffirm.“Schools provide safe and supportive environments, structure and routines for children, as well as other needed support services to children and families,” the CDC notes.Children are less likely to become ill when infected with the virus, and younger children are less likely to transmit the virus to others, the report adds.But a large-scale study out of South Korea recently reported that children ages 10-19 -- middle- and high-school ages -- can spread the virus as easily as adults.Also, in searching citations in the new CDC recommendation to re-open schools, it appears to completely leave out the large-scale South Korea study that found teens are likely to spread #COVID19 as readily as adults 5/ https://t.co/ABLPvpKQU5— Phil Williams (@NC5PhilWilliams) July 25, 2020 In addition, a new study – shared by the Tennessee Department of Health last week on Twitter – concluded that “young, previously healthy adults can take a long time to recover from COVID-19.” 3828

来源：资阳报