Thanksgiving weather travel roundup: floods, snow, severe storms

For Thanksgiving 2011, two pernicious weather systems are bringing the hurt to different parts of the U.S. We're talking the chance of severe storms, flash flooding and quickly accumulating snow. Without ado, here's what to expect for where you're going:

Washington, D.C., specifically: It's looking like we slip out from under most of the nation's bad weather this week, although in this case "bad weather" is relative. A high chance of showers stretches from today to Wednesday, when a cold front is scheduled to push through in the afternoon. The National Weather Service thinks there could be a thunderstorm in the first part of Wednesday, and at least 1 inch of rain (2 inches in isolated spots) could fall between now and then. Here's the precipitation forecast from Tuesday to Wednesday, courtesy of NOAA's Hydrometeorological Prediction Center:

On Thanksgiving, a bubble of high pressure will nestle above D.C. and make things pleasant and sunnyish. Throughout the week, temperatures look fair to middlin' in the 50s and even possibly the 60s on Wednesday and Friday. But keep up with the latest ABC7 forecast for changes in the weather.

The Mid-Atlantic region, generally: There's a lot more rain coming for the Mid-Atlantic, specifically in the southern and western parts. The storms pushing up through the South are unloading heavy rain inside a wide belt from Oklahoma to Tennessee. By Tuesday evening, there is a chance for flash flooding in the Ohio Valley.

The Northeast: It's looking like snow is in the cards for Maine all the way south to upstate New York. These winter-weather probability maps from the HPC show where the white stuff could drop on Wednesday to Thursday. Here's the GFS surface forecast for Wednesday morning showing intense weather over New England:

The South: Severe storms are a risk in the South until Tuesday afternoon. The HPC sees an "expansive complex of showers and thunderstorms" over the Southern Plains that expands on Tuesday morning throughout the region. We're talking storminess from Texas to Tennessee to Mississippi to Louisiana, and then onward to Georgia on Wednesday and possibly on Thanksgiving. The weekend is also looking wet and thunderous in the Southern Plains and southeast U.S. Here's where the thunderstorm risk exists on Tuesday, with the yellow swatch marking an area where severe weather (powerful winds, hail) has a slight chance of developing. The map was generated Monday by NOAA's Storm Prediction Center:

Valid as of Monday, Nov. 21, 2011.

The Pacific Northwest: Boy, I hope you're not planning on mountain climbing here for Thanksgiving. Disturbances rushing over the Pacific faster than 40 m.p.h. are expected to throw tons of widespread precipitation on Washington State and Oregon up into Canada. The higher altitudes are likely to get bombed by snow; a foot or more powder could accumulate in the Cascades. Just heavy rain is looking possible in lower elevations along the Pacific coastline. There's also a chance for damaging winds on the coast of Oregon and Washington on Tuesday, so watch out for flying mullets and fishnet stockings.