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National Weather at 1030am November 11 2004


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Cold air invades the U.S.

10:30 A.M. ET 11/11/2004


Matthew Newman and M. Ressler, Sr. Meteorologists, The Weather Channel





Wet weather will continue sliding eastward across the region today as slow-moving low pressure system draws up moisture from the Gulf of Mexico. Rain has overspread the Deep South and thunderstorms are possible especially along the central Gulf Coast. Some of the rain will be especially heavy across the Tennessee and Ohio Valleys. Good news is on tap across the Southern Plains where conditions should calm and dry out as high pressure builds in. This high pressure system will result in cool temperatures though where highs will be close to 20 degrees below average in west Texas. Cool temperatures will persist across the Southeast as a wedge of cool air holds firmly in place. Highs will range from the 40s, 50s and 60s across the Southern Plains to the warm 80s across southernmost Texas and the Florida peninsula. Rain will continue in Georgia and the Carolinas in Friday before the Southeast dries out for the weekend. Meanwhile with chilly high pressure in place and upper-level disturbances coming out of the Southwest, Oklahoma and Texas turn wetter for the weekend with snow possible over the Oklahoma panhandle and parts of western Texas.



High pressure will continue sliding eastward as a cold front slides toward the region. This will mean a brief warm-up back to seasonal averages before the Canadian chill sets in. Rain showers will accompany this cold front as it moves from the Great Lakes into the region later to today but it should remain dry east of the Appalachians. In fact, the air may even be cold enough for some of the precipitation to fall in the form of snow showers across northern New England and the Adirondacks. Meanwhile, the tail end of this cold front will slow along the Ohio Valley where a steady rain will develop and last into the night. Highs will range from the 40s and 50s across Northern New England to the low 60s across the Mid-Atlantic. A low pressure system tracking along the slowing front will slide across the region on Friday and this will result in cool and wet weather. In fact, there may be enough cold air on the northern fringes of the moisture shield for snow to fall across areas from northern Pennsylvania to southern New Hampshire. In addition, some of the computer forecast models call for a strong coastal low pressure system to develop off of the New England coast this weekend. This could mean the season's first major winter storm across the region. The big question is how far offshore this storm develops. Stay tuned to TWC for updates.



The Midwest will see a variety of weather today. The mid-Mississippi and Ohio Valleys are in for a rather wet day as low pressure heads slowly eastward through region. The low has tapped plenty moisture from the Gulf of Mexico to result in locally heavy rainfall, especially along the lower and middle Ohio River Valley. Meanwhile, the Plains and Upper Midwest are in for a sunny and chilly day as Canadian high pressure takes control of the weather. Highs will range from the 30s and 40s from the Northern Plains and Upper Midwest to the 50s across the Ohio Valley. After the rain exits the eastern Ohio Valley later Friday, the Plains and Midwest could be dry right through Monday as a sprawling area of Canadian high pressure takes control. Snow and rain showers will try to encroach on western and southern Kansas from time to time. Daytime temperatures will rebound to above average levels across North Dakota and northern Minnesota this weekend, but stall between 5 and 15 degrees below average from Kansas to Ohio and Kentucky.



A relatively moisture-starved upper-air low will drift into the Far West--Northern California and Nevada--today, spreading scattered showers and mountain snows (generally light) over much of eastern and central Oregon, the northern halves of California and Nevada, southern Idaho, northern Utah and the central Rockies. Elsewhere, generally sunny weather is expected to prevail in eastern Washington and Montana, and farther south from Southern California to New Mexico. Morning fog and stagnant air remain problems for the valleys of southern Washington and northern Oregon. High temperatures are expected to range from the 30s in much of the Rocky Mountain region to the 70s in southeast California and southern Arizona. As one upper-level low produces shower sand mountain snow over the Four Corners' states on Friday into Saturday, a new showery upper-level disturbance will slide into California Friday night and Saturday. This new disturbance will become an upper-level low centered over Baja California later Sunday and keep the Southwest showery. Over the weekend, high temperatures will be a little average across the Northwest but below average across the Southwest (as much as 15 to 25 degrees below average over eastern parts of Colorado and New Mexico where snow is likely).

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