Snow storms

Snowstorms are storms where large amounts of snow fall. Snow is less dense than liquid water, by a factor of approximately 10 at temperatures slightly below freezing, and even more at much colder temperatures. Therefore, an amount of water that would produce 0.8 in. (2 cm.) of rain could produce at least 8 in (20 cm) of snow. Two inches of snow (5 cm.) is enough to create serious disruptions totraffic and school transport . Snowfalls in excess of 6 in (15 cm) are usually universally disruptive.
A massive snowstorm with strong winds and other conditions meeting certain criteria is known as a blizzard. A large number of heavy snowstorms, some of which were blizzards, occurred in the United States during 1888 and 1947 as well as the early and mid-1990s. The snowfall of 1947 exceeded twofeet with drifts and snow piles from plowing that reached twelve feet and for months, temperatures did not rise high enough to melt the snow. The 1993 "Superstorm" was manifest as a blizzard in most of the affected area.
Large snowstorms could be quite dangerous: a 6 in. (15 cm.) snowstorm will make some unplowed roads impassible, and it is possible for automobiles to get stuck in the snow.Snowstorms exceeding 12 in (30 cm) especially in southern or generally warm climates will cave the roofs of some homes and cause the loss of power. Standing dead trees can also be brought down by the weight of the snow, especially if it is wet or very dense. Even a few inches of dry snow can form drifts many feet high under windy conditions.
[edit] Dangers of Snow
Snowstorms are usually considered lessdangerous than ice storms. However, the snow can bring secondary dangers. Mountain snowstorms can produce cornices and avalanches. An additional danger, following a snowy winter, is spring flooding if the snow melts suddenly due to a dramatic rise in air temperature. Deaths can occur from hypothermia, infections brought on by frostbite or car accidents due to slippery roads. Fires and carbonmonoxide poisoning can occur after a storm causes a power outage. Large amounts of snow can also significantly reduce visibility in the area, a phenomenon known as a whiteout; this can be very dangerous to those who are in a densely populated area, as the whiteout can cause major accidents on the road or while flying. There is also several cases of heart attacks caused by overexertion while shovellingheavy wet snow.
Las tempestades de nieve son las tormentas adonde bajan las granes cantidades de nieve. La nieve es menos densa que el agua líquida, por un factor de aproximadamente 10 en las temperaturas levemente bajo cero, y aún más en temperaturas mucho más frías. [citación necesaria] por lo tanto, una cantidad de agua que produciría 0.8 adentro. (2 cm.) de la lluvia podría producir por lomenos 8 adentro (20 cm) de nieve. Dos pulgadas de la nieve (5 cm.) son bastantes para crear interrupciones serias para traficar y para enseñar transporte (debido a la dificultad para conducir y para maniobrar los autobuses escolares en los caminos pulidos). Esto es particularmente verdad en lugares donde están infrecuentes las nevadas pero las nevadas de acumulación pesadas pueden suceder (e.g.,Dallas, Atlanta, Seattle, Londres, Dublín, Canberra, Vancouver y Las Vegas). En lugares donde están comunes las nevadas, por ejemplo Utica, Detroit, Denver, Ottawa, Montreal, Quebec City, Chicago, Syracuse, búfalo, Columbus, Pittsburgh, Toronto y Minneapolis, tales pequeñas nevadas son raramente quebrantadoras, debido a retiro de nieve eficaz y de hielo por los municipios, el mayor uso de losneumáticos de nieve y conductores usados más a las condiciones del invierno. Las nevadas superior a 6 adentro (15 cm) son generalmente universal quebrantadoras.

Una tempestad de nieve masiva con los fuertes vientos y otras condiciones que cumplen ciertos criterios se conoce como ventisca. Una gran cantidad de tempestades de nieve pesadas, algunas cuyo eran las ventiscas, ocurrido en los Estados...