http://www.wunderground.com/news/flood-threat-plains-mississippi-valley-ohio-valley-ozarks-20141008
Flash flooding has returned to center stage in parts of the nation this week.
Wednesday, cars were stranded by floodwaters flowing through the Arcadia Wash in Tucson, Arizona. Thursday, Colorado Springs set its record wettest October day, picking up 2.83 inches of rain, almost doubling the previous record (1.63 inches). Almost 6 inches of rain overnight Thursday night into Friday morning triggered street flooding in Chautauqua, Kansas.
First up, a frontal boundary has stalled in east-west fashion from the Ozarks to the Appalachians. Moisture from the Gulf of Mexico flowing into the boundary, along with lift from the jet stream flowing parallel to the quasi-stationary front, will help ignite clusters of thunderstorms with heavy rain near the front through early Sunday.
A deep southward dip in the jet stream, or trough, will dive into the Rockies later Sunday, then swing east though mid-week.
Tapping deep moisture ahead of its attendant cold front, bands of thunderstorms with locally heavy rainfall will lead the front's advance from the southern Plains, Ozarks and Mississippi Valley late Sunday and Monday to the East Coast by Wednesday.
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