Chicago Could Get 2 Feet Of Snow, Dallas Airport Opens One Runway

A massive snowstorm is raging across the U.S. heartland. The weather will affect areas from New England to New Mexico, and travelers should brace for as many as four days of serious storm conditions, said CNN meteorologist Rob Marciano. Travel will probably be difficult if not impossible in many areas, the National Weather Service warns. Share your snow images with CNN iReport. Follow @CNNTravel on Twitter for the latest updates.

A massive snowstorm is raging across the U.S. heartland. The weather will affect areas from New England to New Mexico, and travelers should brace for as many as four days of serious storm conditions, said CNN meteorologist Rob Marciano. Travel will probably be difficult if not impossible in many areas, the National Weather Service warns.

Share your snow images with CNN iReport. Follow @CNNTravel on Twitter for the latest updates.

A man tries to push a car in Oklahoma City.

[Update 11:55 a.m. ET] Chicago is expected to get two feet of snow in the next 24 hours, according to the Chicago Tribune - that's more dire than what was reported earlier Tuesday. The National Weather Service is describing the storm as "potentially life-threatening" for people who venture outdoors. Winds in and near the city could gust up to 60 mph, the NWS says. Power outages are likely. The Chicago Weather Center is tracking.

[Update 11:30 a.m. ET] Dallas Fort Worth International Airport has reopened one runway, according to airport spokesman David Magana. The airport has a total of seven runways. It was closed Tuesday at 9:15 a.m. due to ice. Magana says DFW officials are expecting 400 to 500 flight cancellations today. Normal air traffic for DFW is 800 daily flights.

– Wind chills in Omaha, Nebraska, are expected to reach -25 degrees overnight with actual highs only in the single digits on Wednesday, KETV reports.

[Update 11:10 a.m. ET] Detroit officials are saying it could be the worst snow storm to strike since 2005 when 12.2 inches fell. Seven to 12 inches of snow is expected to fall across metro Detroit late Tuesday night and into Wednesday.  The record is 24.5 inches set April 6, 1886. For a comprehensive look at conditions.

– Four states are under a state of emergency and have called in the National Guard. They are  Missouri, Oklahoma, Kansas and Illinois.

[10:55 a.m. ET] Four thousand flights have been canceled due to the bad weather. Eight states have active blizzard warnings. In Oklahoma, snow is falling at 2 to 3 inches per hour.

[10:47 a.m. ET] Dallas Cowboys stadium sacked with snow. Road conditions in Dallas are terrible in these few days left before Super Bowl XLV happens at the stadium in Arlington.

[10:40 a.m. ET] Tornado warnings issued for parts of Louisiana.

[Update 10:10 a.m. ET] Sleet is coming down in St. Louis where ice already coats trees, CNN's Reynolds Wolf reports from the Missouri city. Subzero temperatures are expected across the Plains.

– New Yorkers are preparing for snow as mounds already piled on Long Island.

– In Mattapan, Massachusetts, transit authorities tried to clear snow.

– Connecticut Governor Dannel Malloy has activated the state's emergency operations center.

[9:25 a.m. ET] Ice has closed Dallas Fort Worth International Airport and at least 300 outbound flights were canceled, spokesman David Magana said. Meanwhile, Dallas' Love Field is down to one open runway, according to the FAA.

– Blizzard conditions expected across portions of eight states, from Oklahoma to Michigan. Winds gusting up to 40 mph are predicted.

– Oklahoma is under a state of emergency, and Missouri has mobilized 600 National Guard troops to help cope with the storm.

– Chicago is going to get hit hard, forecasters said. Combined snow totals through Wednesday may exceed a foot and a half across much of northern Illinois and far northwest Indiana, according to the National Weather Service.

CNN