The National Weather Service said "considerable damage" had been reported near Cleburne, south of Fort Worth, and Lancaster, south of Dallas. Local television footage showed overturned and smashed semi-trailers on the ground in the southern portion of Dallas County. "Obviously we're going to have a lot of assessments to make when this is done," Dallas County spokeswoman Maria Arita said.
Flights heading to Dallas-Fort Worth International Airport were being delayed almost three hours. AccuWeather reported significant damage at Six Flags Amusement Park in Arlington. Dallas Police spokeswoman Sherri Jeffrey said twisters also caused damage inside the city limits. The storms spewed hail, some as large as baseballs, the weather service said. All tornado warning in the immediate Dallas-Fort Worth area were canceled by the National Weather Service around 3 p.m CT, although two tornado warnings were still in effect for counties several miles northeast of Dallas. A tornado watch — meaning that conditions are ripe for tornadoes to continue to form — was in place for 33 counties in north-central and northeastern Texas until 8 p.m. CT, the National Weather Service reported. Weather service advisories said storm spotters and radar had showed separate "large and extremely dangerous" tornadoes south of Dallas and Fort Worth. "There's tremendous damage here," NBC 5 reported from Lancaster. The station reported that a daycare center was heavily damaged but that the children and adults inside appeared safe. Footage from highway video cameras showed a large, dark funnel cloud moving on the ground not far from a major interstate early Tuesday afternoon. Crumpled orange tractor trailers were later visible in a Dallas County parking lot, as well as flattened trailers along the sides of highways and access roads. The storm pushed cars into fences and toppled trees over. Branches and limbs were scattered across lawns and in the streets. A tow-behind RV was torn apart and crumpled in a driveway where part of a roof from a house landed. - USA Today.
WATCH: Tornadoes rip through Dallas.
WATCH: Scenes of destruction.
This comes against the background of the National Weather Service's implementation of an experimental tornado warning policy change to offices that serve Missouri and Kansas on Monday, April 2, 2012.
WATCH: Scenes of destruction.
This comes against the background of the National Weather Service's implementation of an experimental tornado warning policy change to offices that serve Missouri and Kansas on Monday, April 2, 2012.
The new policy will apply three distinct sub-categories of tornado warnings, as follows: an "ordinary" tornado warning, a warning of a "particularly dangerous situation," stating that a tornado has been sighted on the ground and a "Tornado Emergency", which will explicitly state that there is a tornado on the ground and will include words such as "mass devastation and "un-survivable" when necessary. The warnings have been implemented to effectively communicate the severity of an approaching storm, and to encourage more people to take heed. The policy is designed to help mitigate the frequency of which people ignore alarms for impending storms, especially people living in mobile homes who may need to travel to seek suitable shelter. The May 22, 2011 devastation of Joplin, Mo., that killed 185 people and injured over a thousand residents is being used as the prime example by the National Oceanic and Atmospheric Administration (NOAA). According to a NOAA survey report, "the perceived frequency of siren activation in Joplin led most survey participants to become desensitized or complacent to this method of warning." In this report, the NOAA encourages that the National Weather Service "explore evolving the warning system to better support effective decision making." "The majority of Joplin residents did not take protective action until processing additional credible confirmation of the threat and its magnitude from a non-routine, extraordinary risk trigger," the report explains. A sample of the new warning released by the NWS reads:
"THIS IS A PARTICULARLY DANGEROUS SITUATION. HAZARD...DEADLY TORNADO. SOURCE... EMERGENCY MANAGEMENT CONFIRMED LARGE AND DESTRUCTIVE TORNADO IMPACT... COMPLETE DESTRUCTION OF ENTIRE NEIGHBORHOODS IS LIKELY. MANY WELL-BUILT HOMES AND BUSINESSES WILL BE COMPLETELY SWEPT FROM THEIR FOUNDATIONS. DEBRIS WILL BLOCK MOST ROADWAYS. MASS DEVASTATIONS IS HIGHLY LIKELY, MAKING THE AREA UNRECOGNIZABLE TO SURVIVORS. TORNADO MAY BE UN-SURVIVABLE IF SHELTER IS NOT SOUGHT BELOW GROUND LEVEL."
The experimental policy change, which will run through late fall, will be analyzed by a North Carolina research team to determine if it is suitable for expansion to other parts of the country. - Accu Weather.
WATCH: NWS' warning system.
















