Chattanooga Times Free Press
Drought are more likely than blizzards this winter
Don’t expect much of a winter wallop this year, except for the pain of worsening drought, U. S. government forecasters said Thursday.
Two- thirds of the United States should get a warmer than normal winter, the National Oceanic and Atmospheric Administration predicted. Only Washington, northern Idaho, Montana, the Dakotas and northwestern Minnesota, will get a colder than normal winter, forecasters said.
The forecast for winter rain and snow splits the nation in three stripes. NOAA sees the entire south from southern California to North Carolina getting a dry winter. Forecasters see wetter weather for the northernmost states: Oregon and Washington to Michigan and dipping down to Illinois, Indiana, Ohio and other parts of the Ohio Valley. The rest of the nation will likely be closer to normal, NOAA said.
For the already dry Southwest and areas across the South, this could be a “big punch,” said NOAA drought expert David Miskus. About 45% of the nation is in drought, the highest level in more than seven years.
Mike Halpert, deputy director of NOAA’s Climate Prediction Center, said he doesn’t see much relief for central and southern California, where wildfires have been raging.
What’s driving the mostly warmer and drier winter forecast is La Nina, the cooling of parts of the central Pacific that alter weather patterns worldwide, Halpert said.
For the East, big snowstorms or blizzards aren’t usually associated with La Nina. That’s more likely with its warming ocean counterpart, El Nino, he said. But he added that extreme events are not something meteorologists can see in seasonal forecasts.
Halpert also said he doesn’t expect the dreaded polar vortex to be much of a factor this year, except maybe in the Northern Plains and Great Lakes.
The vortex is the gigantic circular upperair pattern that pens the cold close to the North Pole. When it weakens, the cold wanders away from the pole and brings bone- chilling weather to northern and eastern parts of the U.S.
While Halpert doesn’t see that happening much this winter, an expert in the polar vortex does.
Judah Cohen, a winter weather specialist for the private firm Atmospheric Environmental Research, sees a harsher winter for the Northeast than NOAA does. He bases much of his forecasting on what’s been happening in the Arctic and Siberian snow cover in October. His research shows that the more snow on the ground in Siberia in October, the harsher the winter in the eastern United States as the polar vortex weakens and wanders south.
Snow cover in Siberia was low in early October, but it is catching up fast and looks to be heavier than normal by the end of the month, he said.