Another Brutal Winter?

The AccuWeather.com Long-Range Forecasting Team is predicting another brutally cold and snowy winter for a large part of the country, thanks in large part to La Niña… yet again.

La Niña, a phenomenon that occurs when sea surface temperatures across the equatorial central and eastern Pacific are below normal, is what made last year’s winter so awful for the Midwest and Northeast. Monster blizzards virtually shut down the cities of New York and Chicago. Last winter was one of New York City’s snowiest on record.

La Niñas often produce a volatile weather pattern for the Midwest and Northeast during winter due to the influence they have on the jet stream. The graphic below shows the position the jet stream typically takes over the U.S. during La Niña.

This graphic illustrates the common position the jet stream takes over the United States during La Niña.

The way the jet stream is expected to be positioned during this winter’s La Niña will tend to drive storms through the Midwest and Great Lakes. Last year, the jet stream steered storms farther east along the Northeast coast, hammering the Interstate 95 corridor.

Therefore, instead of New York City enduring the worst of winter this year, it will likely be Chicago.

The West is expected to be split between mild and dry conditions in the Southwest and highly-variable, frequently-changing weather elsewhere.

Chances that Texas pulls out of its epic drought this winter are extremely slim with below-normal precipitation predicted for a large portion of the state.

Brutal Winter Ahead for the Midwest, Great Lakes

Hands down, AccuWeather.com’s long-range experts agree that the Midwest and Great Lakes region will be dealt the worst of winter this year.

Bitterly cold blasts of arctic air are expected to invade the northern Plains, Midwest and Great Lakes December through January, while snowfall averages above normal. “A couple of heavy hitters are possible [during this time],” Pastelok said in relation to the snow.

Full Winter Forecast for the Midwest and Great Lakes

More Monster Snowstorms for the Northeast This Winter?

Overall, this winter is not expected to be as extreme as last winter for the Northeast’s major cities. However, there could still be a few snow or ice storms that have a significant impact.

 Snowfall is forecast to average near or even slightly above normal in areas south and east of the mountains from Virginia to Maine.

For areas north and west of the Appalachians, however, snowfall for the season is expected to be much higher. An early, heavy lake-effect snow season will put northwestern Pennsylvania and western New York into the zone of winter’s worst snow and cold, according to the team.

Full Winter Forecast for the West

The AccuWeather.com 2011-2012 Winter Forecast runs in line with meteorological winter, which begins on Dec. 1 and runs through the end of February. Astronomical winter, on the other hand, begins on Dec. 22 this year and runs through March 20.

Original Story by Accuweather.com