Wednesday, December 30th 2009 Weather Outlook

Wednesday’s Weather Outlook; Mississippi Valley/Great Lakes/Ohio Valley/Southeast System, West System

On Wednesday, a system will push through the East-Central States, whiel a system continues to affect the West. Showers and storms will be likey in portions of the Mississppi Valley and Southeast, associated with a system pushing through the region. Further north, snow will be likely in portions of the Northern Mississippi Valley, Great Lakes, and Ohio Valley. Accumulations of 1-3″ are likely. In the West, a system will cotninue to affect the region. Rain will be likely in coastal areas and in lower elevations inland. Accumulating snow will be likely in portions of the Cascades, Sierra, and Rockies. Below are the thunderstorm and snowfall outlooks for Wednesday.

December 29-January 4th 2009 Plains/Midwest/Great Lakes/Ohio Valley/Northeast Winter Storm

Tuesday-Monday, Plains/Midwest/Great Lakes/Ohio Valley/Northeast Winter Storm

A weak system will eject out into the Plains on Tuesday, and eventually strengthen as it pushes up the Northeast Coast by the weekend. A swath of snow will be likely along and north of the track of the system. A general 1-3″ will be likely over must of the areas including the Plains, Midwest, Great Lakes, Ohio Valley, and portions of the Northeast. In portions of the Appalachins and Northern Northeast, accumualtions of over 6″ will be likely, as the system strengthens as it pushes up the coast. Below is the snowfall outlook for this system.

Tuesday, December 29th 2009 Weather Outlook

Tuesday’s Weather Outlook; Southwest/Plains System, West System

On Tuesday, a system will push through the Plains, while a system pushes into the West. Rain will be likel yin portions of the Southwest and Plains, along with accumulating snow in portions of the Rockies and Plains, associated with a system pushing through. Snow accumulations of 5″ or less will be likely in the Plains and Southern Midwest. In the West, a new system will push intot he area. Rain will be likely along the coast and in lower eelvations of the interior. Accumulating snow will be likely in portions of the Cascades and Rockies. Below are the thunderstorm and snowfall outlooks for Tuesday.

Monday, December 28th 2009 Weather Outlook

Monday’s Weather Outlook; Great Lakes/Northeast System, Great Lakes – Lake Effect Snow, Southwest/Southern Plains System

On Monday, a system will continue to affect the Notheast and Great Lakes, while lake effect snow continues in the Great Lakes, and a system continues to affect the Southwest and Southern Plains. Snow will be likely in portions of the Great Lakes and Northeast, as a slow moving system continues to affect the area. Accumulations are likely, especially in the Appalachians. In the Great Lakes, lake effect snow will be likely, with over 6″ being likely in favored areas. In the Southwest and Southern Plains, a system will cotninue to affect the areas, as it ejects out towards the Plains. Rain will be likely in portions of the Southwest, and accumulating snow will be likely in portions of the Cascades, Sierra,Rockies and Southern Plains. Below are the thunderstorm and snowfall outlooks for Monday.

Sunday, December 27th 2009 Weather Outlook

Sunday’s Weather Outlook; Midwest/Great Lakes/Ohio Valley/Northeast System, West System

On Sunday, a system will continue to slowly push through the Great Lakes, while a system continues to affect the West Coast. Rain and snow will be likely in portions of the Northeast, associated with the Great Lakes System. Some snowfall accumulation is possible in the Northern Appalachians. On the backside of the system, snow will be likely in portions of the Great Lakes, Midwest, and Ohio Valley. Yet another stronger disturbance will rotate around the main system, producing an enhanced area of snow from Illinois into the Ohio Valley. Accumulations of 5″ or less is possible. In the West, a system will continue to affect coastal areas with rain and accumulating snow in portions of the Cascades and Sierra. Below are the thunderstorm and snowfall outlooks for Sunday.

Saturday, December 26th 2009 Weather Outlook

Saturday’s Weather Outlook; Plains/Midwest/Great Lakes/Northeast System, Southwest System

On Saturday, a system will cotninue to slowly push through the Midwest and Great Lakes, while a new system begins to affect the Southwest. Rain will be likely in portions of the Northeast, associated with the Midwest and Great Lakes system. Freezing rain will be likely in portions of the Appalachians and interior Northeast. Ice accumulations of under 0.25″ are possible. In the Plains, Midwest, and Great Lakes, snow will be likely on the backside of the system. A stronger disturbance rotating around the main system will likely produce a stah of heavy snowfall from Missouri up into Illinois. Accumulation up to and over 6″ are likely. In the Southwest, a new system will begin to affect the region. Showers and storms will be likely, along with accumulating snow in portions of the Cascades and Sierra. Below are the thunderstorm and snowfall outlooks for Saturday.

Christmas 2009 Weather Outlook

Thursday, December 25th 2009 Weather Outlook; Plains/Midwest/Great Lakes/Ohio Valley/Southeast/Mid-Atlantic System

On Friday, a system will drift through the Southern Midwest. Showers and storms will be likely in portions of the Great Lakes, Ohio Valley, Southeast, and Mid-Atlantic. Given the avaliable dynamics and instibility, a few sotrms may become severe in the Southeast. The main threats from any severe storms will be damaging winds, hail, and an isolated tornado. Freezing rain will be possible in portions of the Appalachians and Great Lakes. Warm air aloft will preclude any frozen precipitation, but surface temperatures around freezing will allow rain to freeze on contact. Ice accural of up to 0.25″ is possible in many areas. Winds over 25MPH combined with the ice, may cause power outages and tree damage. On the backside of the system, accumulating snow will be likely in portions of the Plains and Midwest. Accumulations over 6″ will be likely in many areas. Winds over 25MPH combined with the snow, may create blizzard conditions at times. In the Eastern Great Lakes, precipitation will change over to snow, after the day starts with rain or freezing rain. Some accumulation is possible. Below is the weather outlook for Christmas.

Thursday, December 24th 2009 Weather Outlook

Thursday’s Weather Outook; Plains/Midwest/Great Lakes/Mississippi Valley/Ohio Valley/Southeast System

On Thursday, a system will push through the Plains and up the Mississippi Valley. Showers and storms will be likely across portions of the Mississippi Valley, Ohio Valley, and Southeast. There is a slight risk for severe storms in portions of Louisiana, Arkansas, Missisippi, Alabama, Florida, and Georiga. Strong forcing and dynamics along with Cape values up to 500 J/Kg, LI’s up to -1, and Effective Shear values up to 60Kt, will aid in the development of severe storms across the risk area. Severe storms in the form of a squall line, will race across the area through the day. The main threats from any storms that become severe will be damaging winds, hail, and an isolated tornado. Further north across portions of the Southern Midwest, Great Lakes, and Appalachians, freezing rain will be possible. Warm air aloft will preclude any frozen precipitation, but surface temperatures around freezing will allow rain to freeze on contact. Ice accural of up to 0.25″ is likely in many areas. Winds over 25MPH combined with the ice, may cause power outages and tree damage. On the backside of the system, accumulating snow will be likely in portions of the Plains and Midwest. Accumulations over 6″ will be likely in many areas. Winds over 25MPH combined with the snow, may create blizzard conditions at times. Below are the severe weather and snow/ice outlooks for Wednesday.

December 22-28th 2009 Plains/Midwest/Great Lakes Blizzard

Tuesday-Monday, Plains/Midwest/Great Lakes Blizzard

A large storm system will begin to effect the Plains by Tuesday, and slowly push up through the Great Lakes late into the week and over the weekend. A large area of snow will be likely over portions of the Plains, Midwest, and Great Lakes. Accumulations are likely, with many areas in the Plains and Midwest recieving more than 12″ of snow. Areas further east in the Great Lakes will see a mixture of precipitation through the period, before things change over to snow on Friday and Saturday, as colder air moves in. Lighter accumulations will be possible in the Lakes. Winds over 25MPH will create blizzard conditions at times in portions of the Plains and Midwest. In portions of the Plains and Southern Midwest, a period of freezing rain will be likely from Tuesday into Thursday. Warmer air aloft will move in as precipitation moves through, surface temperatures will stay around freezing which will cause the rain to freeze on contact. Winds over 25MPH may create power outages and tree damage. Ice accural is likely, with up to 0.50″ being posssible from Kansas up into Iowa, Illinois, and Wisconsin. High amounts up to 1.00″ will be possible in Iowa. Further south, heavy rainfall will be likely across much of the Mississippi Valley. 1-4″ of rain is likely, and combined with some snow melt, flooding is possible. Below are the snowfall and ice accural maps for this system.

Wednesday, December 23rd 2009 Weather Outlook

Wednesday’s Weather Outlook; Northeast System, Rockies/Plains/Midwest/Mississippi Valley System

On Wednesday, a system will continue to affect the Northeast, while a system pushes through the Plains. Snow will be likely in portions of the Northeast, as a system continues to effect the area. Accumulations will be likely, with over 6″ being possible in Maine. In the Plains,a  system will push through the area. Showers and storms will be likely in portions of the Plains and Mississippi Valley. There is a slight risk for severe storms in portions of Texas, Louisiana, Oklahoma, Arkansas, Kansas, and Missouri. Strong forcing and dynamics along with Cape values up to 1500 J/Kg, LI’s up to -5, and Effective Shear values up to 60Kt, will aid in the development of severe storms across the risk area. The potential for severe storms will exist within an area of return flow across Eastern Texas and Western Louisiana, and ahead of the cold front in Central and Eastern Texas. The main threats from any storms that become severe will be damaging winds, hail, and an isolated tornado. Further north across portions of the Southern Midwest, freezing rain will be possible. Warm air aloft will preclude any frozen precipitation, but surface temperatures around freezing will allow rain to freeze on contact. The area at greatest risk for ice accural up to 0.75″ include portions of Kansas, Missouri, Nebraska, Iowa, Illinois, Indiana, Wisconsin, and Michigan. Winds over 25MPH combined with the ice, may cause power outages and tree damage. Further north, accumulating snow will be likely across the rest of the Midwest, Plains and Rockies. Accumulations over 6″ will be likely in many areas. Winds over 25MPH combined with the snow, may create blizzard conditions at times. Below are the severe weather and snow/ice outlooks for Wednesday.