Iowa tornadoes: 4 of 7 killed were in same family, authorities sayAccording to the NWS, each survey team is equipped with a technology kit before they head to the site of the storm damage.
The kit includes things such as a GPS, a computer with damage survey software, an atlas, a digital camera, a compass and a notebook."Most commonly, a survey team will conduct a full ground survey in order to assess tornado damage, but occasionally, a team may also conduct an aerial survey if the spatial extent of the damage is large enough," the NWS office in Amarillo, Texas, wrote in a 2011 post about damage surveys.According to the NWS, most teams will start with determining the starting and ending points of the suspected tornado.
They will then move on to determining the width of the damage path, followed by locating the worst damage along that path.The survey team will assign one of 28 indicators to each type of storm damage they see.
The indicators include all types of structures and even tree damage."Each one of the damage indicators has a description of the typical construction for that category of indicator," the NWS wrote. "For example, typical construction for one- and two-family residences includes asphalt shingles, tile, slate or metal roofing, attached single car garage, and brick veneer, wood panels, stucco, vinyl or metal siding."Once all of the indicators are assigned, the team moves on to assign a degree of damage to each of them.