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    Major Storm Potential Palm Sunday Weekend

    By , AccuWeather.com Senior Meteorologist
    March 23, 2013; 9:00 AM ET
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    Another major storm has begun to cross the nation with areas of heavy snow, flooding rain and severe thunderstorms. The worst conditions with the storm will come over this Palm Sunday weekend.

    Like many storms during the second half of the winter, this first major storm of the spring could threaten lives and property, bring significant travel disruptions and foil outdoor plans.

    The storm will drive cold air southward over the Rockies and part of the Great Basin.

    After bringing drenching rain and heavy mountain snow to the Northwest and part of the Rockies late this week, the Central states will now see impacts from the storm this weekend.

    Heavy Snow Denver to St. Louis, Indianapolis and Dayton
    Snow to Reach I-95 Mid-Atlantic Sunday Night
    Twelve Million in Path of Severe Storms in South

    The exact track of the center of the storm determines the dividing line between receiving some heavy snow versus drenching rain.

    The storm will move eastward along a strong temperature contrast from south to north. Almost midwinter cold continues to linger in the northern tier states, while warmth and humidity build over the Deep South. This temperature contrast will likely be compressed in the middle with a distance of a couple hundred miles or less potentially separating temperatures in the 80s from the 20s and low 30s.

    The temperature contrast will make for very challenging forecasts when determining which areas near the storm track will get snow versus rain. However, this stored energy can yield very dramatic results ranging from a foot or more of snow in some areas to a half a foot of rain with flooding and a severe weather outbreak.


    Snow will start as far west as the Rockies as it gathers enough cold air to begin producing a swath of heavy snow. Over this weekend, snow will stretch from Denver and into the central Plains.

    During Sunday, the band of heavy snow will nose eastward, most likely impacting some of the Ohio Valley states. A small shift in the storm track could mean the difference between heavy snow in Kansas City, St. Louis, Indianapolis and Dayton versus Omaha, Chicago and Cleveland.

    By Monday, the zone of heavy snow will be impacting part of the central and southern Appalachians and could be aiming all the way to part of the mid-Atlantic coast and the I-95 corridor.

    Severe Weather

    The southern portion of this storm will allow severe weather to develop in the Deep South from Texas and Louisiana to Mississippi, Alabama, southern Georgia and northern Florida with the storm system this weekend.

    Humid air will nose northward along the Gulf Coast as the storm tracks eastward to the north.

    Blinding downpours and flooding could disrupt travel and foil outdoor activities during the Palm Sunday weekend. However, there is the potential for more violent weather conditions that could threaten lives and property in part of the Deep South.

    According to Severe Weather Expert Henry Margusity, "Such a setup can deliver thunderstorms with large hail, damaging wind and perhaps a few tornadoes."

    With these storms, the main severe threats look to be thunderstorms containing damaging wind gusts and hail.

    This photograph of large hail and damage was taken in Pearl, Miss., on Monday, March 18, 2013, and is used with permission by an anonymous Facebook fan.

    Flooding Rain

    With the temperature contrast zone suppressed so far to the south and the potential for humid (very moist) air to surge northward into cool air, there is a risk of tremendous rainfall occurring south of the heavy snow area.

    This zone will most likely occur over the interior South, beginning somewhere near the lower Mississippi River and shifting eastward with the storm track. However, it is not likely to be a brief event and can fire a day or two ahead of a dry sweep of air on the storm's southwestern flank.

    "This means some areas could have rounds of heavy rain over a two- or three-day period beginning as early as Friday or Saturday in some locations," Margusity added.

    While any non-disruptive rainfall would be welcomed in areas of ongoing or building drought from South Carolina to Georgia and Florida, it has the potential to get ugly.

    The setup could bring low-lying and urban area flooding to significant rises on some of the rivers and will be monitored closely.

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