Posted: $util.date("h:mm a MMM d, yyyy",$story.contentLiveDate,$timeZone)
Reporter: AP

The main weather event of the nation shifts east of the Mississippi River on Wednesday as the strong cold front moving through the Central U.S. ushers a very unsettled weather pattern into the East. Deep, southerly flow streaming out ahead of the storm will allow for widespread rain -- heavy at times -- to develop ahead of the cold front from parts of the Southeast through the Ohio Valley and Northeast through the day. Heavy and persistent rains will increase chances of flooding as the cold front approaches. Increased instability ahead of the front will also trigger organized thunderstorms that may turn severe. Areas from the Southeast through the eastern Ohio Valley and the Mid-Atlantic are expected to remain at slight risk of severe thunderstorm development with threats of damaging wind and a few isolated tornadoes. Residents in these areas are encouraged to monitor their local weather conditions on Wednesday and take proper precautions against inclement weather.
To the north, a warm front associated with this system will kick up rain showers and periods of heavy rain. Much colder air on the backside of this system will support more light to moderate snow showers across the Upper Great Lakes and portions of the western Ohio Valley.
To the west, onshore flow will maintain coastal rain and more moderate to heavy high elevations snow in the Pacific Northwest, Northern Great Basin, and parts of the Northern Central Rockies.
TUESDAY'S WEATHER EXTREMES:
HIGHEST TEMPERATURE (DEGREES F)...............94 Laredo, Texas
HIGHEST HEAT INDEX (DEGREES F)........94 Kingsville NAS, Texas
LOWEST TEMPERATURE (DEGREES F)...................-18 Daniel, Wyo.
LOWEST WIND CHILL (DEGREES F)............-57 Deadhorse, Alaska
HIGHEST WIND GUST (MPH)..................79 Guadalupe Pass, Texas
HIGHEST PRECIPITATION (INCHES)...........2.38 Whiteman AFB, Mo.
ON THIS DATE....... A massive arctic air mass over Alaska dropped temperatures in the state to as low as -75 degrees on this date in 1989. As this air mass began moving towards the continental United States, warm air was pushed ahead of it, causing a balmy temperature reading of 62 degrees in Great Falls, MT. As the front pushed through the upper Midwest, wind gusts of up to 124 mph were reported in Choteau, MN.

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