|500 millibar map for 7:00 a.m. CDT May 11, 2014|
The Pacific center dropped southeast into the Four Corners region on Sunday. Sunday morning's surface weather map had one long frontal system extending east from southern California through the central U.S. to off the New Jersey coast.
|Surface map for 7:00 a.m. Sunday, May 11, 2014|
|Snow falling in Walden, CO (Jackson County) on Sunday,|
where about 10 inches accumulated. Photo by Peg Brocker.
|72-hour snowfall ending the morning of Tuesday, May 13.|
Meanwhile, south of the front temperatures soared to summer like readings in the 80s and 90s from Texas north to Kansas and east to southern Michigan and Ohio on Sunday. The warm weather was also accompanied by dewpoints in the 60s.
|Temperature (L) and dew point (R) at 4:00 p.m. CDT Sunday, May 11.|
The warm, unstable air and the frontal boundary produced conditions ripe for severe weather, and the worst storms occurred along the front in an arc from southwestern Kansas to southeastern Nebraska, southern Iowa and northern Illinois. Severe weather continued along the system Monday and today, but severe weather reports were far fewer in number.
|24-hour precipitation ending at 7:00 CDT 5/13/2014|
The slow-moving upper trough and the associated surface front will spend the next three days moving through the eastern half of the country. Showers and thunderstorms weill continue to develop in the warm humid air ahaead of the front, while showers will occur in the cool air behind the front beneath the upper level low.
|Quantitative precipitation forecast for the 3-day period ending Friday at 7:00 p.m. CDT|