Washington -LRB- CNN -RRB- -- Another massive snowstorm barreled into the mid-Atlantic region Tuesday , as residents still reeling from a paralyzing weekend blizzard faced more of the same . Hundreds of flights were canceled , and airlines were waiting to see whether they would have to cancel more . No flights were expected to be operating Wednesday at Reagan National Airport or at Washington Dulles International , the Washington Airports Authority said . Federal workers and schoolchildren in the nation 's capital were told to stay home for a second consecutive day . The National Weather Service predicted another 10 to 20 inches of snow for northern Virginia , eastern Maryland and Washington beginning Tuesday afternoon and continuing through Wednesday . In last weekend 's blizzard , a record 32.4 inches of snow fell on Washington 's Dulles International Airport over two days , breaking the January 7-8 , 1996 , record of 23.2 inches . Are you there ? Share your winter weather photos , video If as severe as predicted , the new storm will be the third major snowfall to hit the nation 's capital and surrounding region in slightly more than seven weeks . In Washington on Tuesday , out-of-towners Susan Martin and Robert Travers told CNN affiliate WJLA they had just flown to the city for a conference , but learned when they arrived that the conference had been canceled . Flights that would take them home from Reagan National Airport had been canceled , too . `` We probably wo n't get a flight back out of here until Thursday . That 's what they 're telling us , '' Martin told WJLA . WJLA.com : People stranded at Washington airports , train stations It was not expected to begin snowing in some areas until Tuesday night or Wednesday . Forecasters said Philadelphia , Pennsylvania , could be slammed with 3 to 7 inches Tuesday and an additional 8 to 12 inches on Wednesday ; Washington , 4 to 8 inches on Tuesday night and another 3 to 7 inches Wednesday ; 5 to 8 inches Tuesday and 3 to 5 on Wednesday in Boston , Massachusetts ; and 2 to 4 inches Tuesday and 6 to 10 inches Wednesday in New York . Snow coverage from CNN affiliate WBAL Delays of 30 minutes were reported for some flights at Chicago , Illinois ' , O'Hare International Airport , where more than 600 flights were canceled . Most of the flights at Midway Airport also were canceled , according to Gregg Cunningham , spokesman for the Chicago Department of Aviation . Southwest Airlines was expecting to resume its normal schedule Wednesday at 10:30 a.m. , he said . Travelers should confirm the status of their flights by checking their airline 's Web site before departing for the airport , he advised . Delta Air Lines canceled 375 flights , including regional flights , in various locations Tuesday , spokesman Anthony Black said . He said a decision would be made Tuesday evening on any Wednesday cancellations . American Airlines canceled 80 flights into and out of Washington and Philadelphia , spokesman Tim Wagner said . American and Delta said they had pre-emptively canceled 120 flights for Wednesday for both cities . US Airways canceled 135 mainline flights and 307 US Airways Express flights systemwide , spokesman Andrew Christie said . He said the airline has canceled 380 mainline flights and 1,042 US Airways Express flights . Snow causes more headaches for travelers The storms were taking a financial toll on local governments . Alexandria , Virginia , spent more than $ 1 million for the massive snowstorm that hit the region in December , budget analyst Morgan Routt said , and the city was still cleaning up after last weekend 's storm . `` So , you can imagine , that 's costing even more , '' he said . `` We 've had people working around the clock . '' The city , whose fiscal year runs from July 1 to June 30 , generally budgets $ 790,000 annually for snow removal . That covers the costs of equipment , personnel , contractors , materials and supplies . For the 2009 year ending in July , Routt said , the city spent only $ 485,000 . Part of this year 's costs are reimbursable by the federal government because the governor declared a snow emergency , he added . All Washington National Guard full-time personnel were asked to report for duty Tuesday morning and expect to stay for two or three nights , helping with emergency response operations . Elsewhere , crews worked 24-hour shifts to clear roads and repair power lines , warning that it might take days to restore electricity to some customers from Pennsylvania to Virginia . In Mount Penn , Pennsylvania , about 50 miles northwest of Philadelphia , many people were using the space between last week 's storm and the approaching one to fix snowblowers , CNN affiliate WFMZ reported . Dave Swope , who has worked at Leinbach 's Hardware in Mount Penn for 25 years , said Tuesday he has never seen so many people wanting to fix their snowblowers at the same time . `` We got people yesterday asking us how to start them , how to turn them on , '' Swope told WFMZ . `` They just have n't used them in years , and then the knowledge goes away . '' WFMZ.com : Snow blowers piled up for fixing before storm CNN 's Steve Kastenbaum and Sean Morris contributed to this report .