Interior New England Getting Pounded – and Buried

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[The following is a slightly edited version of the ImpactWeather Storm Development Outlooksm which is generated daily during severe weather outbreaks that affect a substantial part of the country.  The SDO is emailed to ImpactWeather clients.  – Dave]

Storm Development OutlookSM
Issued:  12:17 PM CST Friday February 25, 2011

Heavy Snow Pounding the Interior Northeast With Strong Coastal Winds

Strong Winter Storm Affecting Most of California Through Saturday

Another Severe Weather Risk Over Southern and Eastern U.S. on Monday

Heavy Snow Threat Today: A fast-moving low pressure area will move from coastal New England through the Canadian Maritime Provinces producing a good chance of locally heavy snow. Falling snow will increase in coverage and intensity over central New England late this morning, spreading quickly northeast across the Canadian Maritime this afternoon through Saturday morning.

Image: ImpactWeather StormWatch

Snow amounts across this region are forecast to average from four to eight inches with isolated higher amounts. By far the heaviest snow is expected to fall in a narrow band from upstate New York through central New England where as much as eight to 12 inches is likely to fall. Again, isolated higher amounts are expected with some areas receiving as much as 18 inches, especially across central New England. Snow will quickly end from west to east across the Northeast U.S. tonight and across the Canadian Maritime Provinces later tomorrow.

High Wind Threat Today: South of the snow area, gusty offshore winds will build across the Mid-Atlantic and Northeast this afternoon as the low pressure area moves by the region. Sustained winds of 20 to 30 mph will be common with gusts up to 40-45 mph from eastern Maryland through coastal New England this afternoon into the early evening. Be advised that isolated pockets of even stronger wind gusts of 50-60 mph will be possible during the afternoon as strong winds aloft briefly mix down to the surface. We doubt this will be a widespread problem, but brief periods of stronger winds will be possible over isolated areas, mainly this afternoon. Low-level winds will gradually subside later this evening into early Saturday over the Northeast as the pressure gradient weakens.

California Winter Storm Today Through Saturday: A powerful storm system will shift from north to south across California this afternoon through Saturday bringing a good chance of heavy rain over the lower elevations and heavy snow across the higher elevations. Locally heavy rain with embedded strong thunderstorms with hail will shift from central California this morning and afternoon, southward across southern California including the Los Angeles and San Diego areas this evening into Saturday morning. Rainfall amounts of one to three inches will be possible with isolated higher amounts from Santa Barbara southward to the San Diego area. Farther inland, very heavy snow will be likely over the higher mountains, generally above 2,000 to 3,000 feet where as much as six to 12 inches of snow may accumulate. Higher amounts up to two feet or more will be possible above 4,000 to 5,000 feet of elevation. Snow may fall at elevations as low as 500 feet or less from San Francisco to Los Angeles later today through Saturday. Light snow may briefly accumulate at sea level in some of the more favored areas. Precipitation is forecast to end from north to south across California Saturday evening into Sunday morning as drier air moves into the area.

Long Range: The strong storm system effecting California this weekend is forecast to shift quickly east across the Rockies into the Great Plains bringing another chance of strong to severe thunderstorms from Texas and the Deep South northward across the Ohio River Valley and Atlantic Seaboard on Monday. Thunderstorms are expected to increase in coverage and intensity from east Texas to Missouri and southern Illinois Monday morning, shifting quickly east across the Deep South, the Ohio Valley and the Atlantic Seaboard Monday afternoon and evening. Some of these storms may be severe with strong winds, hail and isolated tornados. At this time widespread severe weather is not expected, however dynamics are favorable for at least isolated severe thunderstorms.

In addition to the severe thunderstorm threat, strong low-level winds of 20 to 30 mph with higher gusts up to 40 to 50 mph will again be possible from northern Virginia through New England Monday afternoon into early Tuesday as a strong area of low pressure moves by the area.

Gmaps can be configured to show satellite (IR, visible or enhanced), radar composite, forecast frontal systems, as well as significant weather threat areas. Image: ImpactWeather Gmaps

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