Pressure and wind visualization of Storm off the coast of New England on Thursday. (WindyTV.com)
Unforgiving cold has punished the eastern third of the United States for the past 10 days. But the most severe winter weather will assault the area late this week.
First, a very large and powerful storm will hammer coastal locations from Georgia to Maine with ice and Snow
. By Thursday, the exploding storm will, in many ways, resemble a winter hurricane, battering easternmost New England with potentially damaging winds in addition to blinding snow.
Forecasters are expecting the storm to become a so-called “bomb cyclone” because its pressure is predicted to fall so fast, an indicator of explosive strengthening. The storm could rank as the most intense over the waters east of New England in decades at this time of year.
As most of the U.S. faces record-breaking cold weather, some TV reporters and social media users are testing the freezing temperatures with some old tricks.
In the storm’s wake, the mother lode of numbing cold will crash south — likely the last but most bitter in brutal blasts since Christmas Eve.
The storm: How much snow and wind, and where
The responsible storm is forecast to begin taking shape off the coast of Florida Wednesday, unloading hazardous snow and ice in highly unusual locations not accustomed to such weather. The National Weather Service has already posted winter storm watches from Lake City, Fla. to Norfolk
It is then expected to explosively intensify, buffeting the Mid-Atlantic beaches and eastern New England, where winter storm watches have also been issued.
The National Weather Service office serving northeast Florida and southeast Georgia cautions that a nasty mix of light freezing rain, light sleet and light snow is expected to develop Wednesday “with significant icing possible.”
In Charleston, one to three inches of snow and sleet is forecast Wednesday, where the Weather Service warns to “plan on difficult travel conditions.”
From Norfolk to the Maryland and Delaware beaches, including much of the southern half of the Delmarva Peninsula, 3 to 6 inches of heavy snow are predicted from Wednesday evening to Thursday afternoon.
GFS model shows accumulating snow from the Georgia-Florida border all the way up the East Coast to Maine.
Farther inland in the Mid-Atlantic, near Interstate 95, the storm’s exact track will be highly consequential. Current computer models suggest most, if not at all, snowfall will occur east of Washington and Baltimore on Wednesday night into early Thursday. But small shifts to the west could bring some snow to these cities.
To the north, Philadelphia and New York have a better chance for a coating of snow, but — unless the storm edges closer to the coast — the more significant snow should remain to their east from Atlantic City to eastern Long Island, where at least four to six inches could fall late Wednesday to late Thursday.
By the time the storm reaches the ocean waters east of Long Island and eastern New England on Thursday, it will be explosively intensifying. The storm’s central pressure will have fallen 55 millibars in just 24 hours — an astonishing rate of intensification.
European model simulation of storm pressure drop between Wednesday and Thursday. (WeatherBell.com, adapted by CWG)
“Some computer models are projecting a minimum central air pressure of below 950 millibars at its peak, which would be nearly unheard of for this part of the world outside of a hurricane,” wrote Mashable’s Andrew Freedman. “For comparison, Hurricane Sandy had a minimum central pressure of about 946 millibars when it made its left hook into New Jersey in 2012.”
Winds will crank in response to this pressure drop, howling to at least 30 to 50 mph along the coast. Winds will be considerably stronger over the ocean — exceeding hurricane force — where enormous waves will form.
Peak six-hour wind gusts are forecast by the European model between 7 a.m. and 1 p.m. on Thursday. (WeatherBell.com)
In Boston, the Weather Service is predicting not only four to seven inches of snow but also winds strong enough to bring down branches. Throughout eastern Massachusetts and eastern Maine, the combination of wind and snow could create blizzard conditions, especially if the storm wobbles west.
“Our biggest concern is the potential for damaging wind gusts especially near the southeast New England coast,” the Weather Service tweeted. “Power outage risk followed by arctic air Fri/Sat a big concern!”
The cold in its wake: record-breaking
Temperature difference from normal forecast Saturday morning by American (GFS) model.
The storm’s enormous circulation will help draw several lobes of the polar vortex, the zone of frigid air encircling the North Pole, over the Mid-Atlantic and Northeast by Friday and Saturday. Wicked cold air sourced from Siberia, the North Pole and Greenland will all converge on the region.