2012 8 Sandbag Construction The use of sandbags is a simple but effective method of preventing or reducing damage from floodwater and debris. (see Figure 2) Suggestions for constructing sandbag struc-tures are:1. Close-weave burlap bags 18â x 30â are recommended for all sandbag construction when available.2.
(Getty Images) A tornado watch has been issued for parts of New York and New Jersey until 5 p.m. Monday, the National Weather Service said. The watch included all five boroughs, as well as Rockland, Putnam and Westchester counties, and all of New Jersey.
How a Tornado Forms. Thunderstorm-. The first thing that is needed to produce a tornado is a thunderstorm. To create a thunderstorm you need to have three things, the first of which is a mass of unstable air, which is the result of warm moist air in the lower atmosphere and cold dry air in the upper atmosphere.