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A major spring storm is moving into the Midwest and Ohio Valley today with a strong severe weather threat in the Southeast US today up to the Southern Middle Atlantic States. Snow for parts of the Upper Great Lakes today and Ohio to Western Pennsylvania and NY on Thursday.

A weekend storm system from the Great Lakes will redevelop along the Virginia coast and head toward Nantucket Sunday morning Weather models specifically the NAM & GFS would suggest a 3 to 6 inch snow fall but the presence of a strong upper air storm cause wide variations in model snow and precipitation amounts. This is leading to very wide variations in the forecast. Weather model analysis and a look at the long range.

A major mid spring snow storm will be ongoing in the Northern and Central Rockies over the next 3 days with 1 foot plus snows. In the East it is very warm with record highs possible across the Northeast. Blocking pattern returns next week which for the east will mean at least average temperatures or even a bit below average. Blocking could last through Memorial Day.

The weather pattern has reverted back to a more normal April pattern with cooler weather in the northeast. Rains continue in the west as more storms move into the Western US. Long Range pattern remains active especially for the Western US.

A compact low will produce brief noreaster conditions Saturday from Coastal New Jersey to Southern New England. Rain of 1 to 3 inches will occur with flooding possible. Satellite loops show blocking pattern breaking down leading to warmer weather next week. Stormy in the western US.

Weather models have been hinting for days of a possible noreaster this weekend and that threat grows today with the GFS model showing a rather deep low off the coast of Southern New England with substantial 4 inch plus rains in some places. Blocking in the atmosphere is breaking down which means warmer weather later next week for the East. In the west activity begins to pick up this weekend as weather systems resume their normal west to east movement.

When you think of a block it is something that prevents you from going from point A to point B which results in you taking a detour. That detour is not always a pleasant one. It can take you longer to make the same trip. This is similar to what happens in the atmosphere. This video explains blocking in the North Atlantic and what it meas to weather in the Eastern US