Severe Threat Brewing? The Heartland, Four Corners Brace for Flash Flooding and More
As a big cold front — bringing fall-like air to the eastern two-thirds of the country — rushes south, it’s expected to bring potential of severe weather to parts of the Upper Midwest.
The main concern will be flash flooding from parts of northern Missouri to the U.P. of Michigan. The latest precipitation estimates suggest a broad swath of 3 to 4 inches of rain will fall from Michigan to Iowa, through the end of the week. That’s prompted numerous National Weather Service offices to post flash flood watches in the region.
Additionally, flash flooding will still be a concern for parts of the Four Corners region. Hard-hit Arizona could see up to another inch of rain through Friday as well. Mostly in the higher elevations. Colorado’s Western Slope could see upward of two inches of rain though Friday as well. Flash flood watches have been posted for parts of Arizona, Utah, Colorado and New Mexico. If you live in the mountainous regions of these states, be aware of the flooding threat, because it could be enhanced in higher terrain.
The remnants of Hurricane Norbert are feeding ample amounts of tropical moisture into the area. And widespread coverage of showers and thunderstorms are expected over the next couple of days.
Monday, Phoenix was its wettest day ever on record. Posting an impressive 3.29 inches of rain, shattering the old record of 1.33″ set back in 1933. Some areas of Arizona saw more than five inches of rain on Monday, adding to an already wet monsoon season.
Additional Severe Threats
In addition to the chance of flash flooding rains in the Upper Midwest, there’s also a threat for hail, high winds and even a few isolated tornadoes.
A developing surface low, coupled with a strong front and ample low-level moisture will come together Tuesday afternoon to aid in the production severe thunderstorms.
The main area of concern will be southeast Nebraska, northwest Missouri and southwest Iowa. If you live in Omaha, Lincoln or Des Moines, stay weather-aware through the end of the day. While supercells may be the initial mode of convection, the storms progress east, the will eventually form a line of cells. A few supercells could still be embedded within the loosely formed line called a Quasi-Linear Convective System (QLCS).