By Brett Rathbun, AccuWeather.com Meteorologist
September 6,2015; 11:30PM,EDT
A storm system that produced strong thunderstorms across Montana and the Dakotas on Saturday will shift eastward and target the Midwest into Labor Day.
According to AccuWeather Senior Meteorologist Matt Rinde, "A frontal system will provide two opportunities for severe weather to end the extended Labor Day weekend."
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Plenty of warm and humid air will be present from Iowa to Minnesota and Wisconsin to help fuel these storms.
"Storms will converge into a squall line and move across Minnesota and Iowa into Sunday evening," according to AccuWeather Meteorologist Becky Elliott.
"The storms progression eastward will bring them into western Wisconsin and eastern Iowa Sunday night," she added.
Cities at risk for severe thunderstorms into Sunday night include Minneapolis and Duluth, Minnesota; Madison, Wisconsin; Des Moines and Cedar Rapids, Iowa; Omaha, Nebraska; and Thunder Bay, Ontario.
Storms are expected to weaken below severe limits prior to reaching eastern Wisconsin, including Green Bay and Milwaukee.
Travel could become dangerous at times across interstates 35, 80, 90 and 94. Drivers should be alert when traveling at high speeds as wet roads could increase the risk of hydroplaning.
Never drive through a flooded roadway. Only a few inches of rushing water could wash away vehicles.
Sunshine, cooler air and less humidity will build across Minnesota and northwestern Wisconsin on Labor Day as an area of high pressure builds into the Upper Midwest. High temperatures will be within a few degrees of normal for the second week of September.
While Minnesota and northwestern Wisconsin dry out for Labor Day, strong storms will target portions of the central Plains on Labor Day.
Heavy and gusty thunderstorms will start on Monday across eastern Iowa and far northern Missouri, followed by another round of severe thunderstorms late in the afternoon.
RELATED:
US Labor Day Forecast
AccuWeather Severe Weather Center
United States Interactive Radar
As a warm southerly flow develops and increases dew points to uncomfortable levels, storms will develop across the same frontal boundary that caused showers and thunderstorms across the Upper Midwest on Sunday.
Dew points better illustrate the amount of moisture in the air, which relates to relative humidity. Warm, moist air is crucial for strong thunderstorms to develop.
The second round of severe thunderstorms will erupt across eastern Nebraska, northeastern Kansas, northern Missouri and Iowa late on Monday into Monday night. Places like Des Moines, Iowa; Omaha, Nebraska; and even Kansas City will have these storms.
The greatest potential for the thunderstorms to trigger damaging winds and hail will exist across the western and southern fringe of the above zone. Flash flooding will be the main threat elsewhere, but localized damaging winds cannot be ruled out.
"The storms that develop across eastern Nebraska and Iowa late in the day Monday will have an abundance of moisture to work with," stated Elliott. "This creates an elevated risk of flooding from the late afternoon through the overnight."
Those planning on spending Labor Day outdoors whether it's having a barbecue or taking a trip to the apple orchards, should keep an eye to the sky in case a thunderstorm approaches.
Anyone traveling across these areas into Labor Day should be alert for dangerous traveling conditions at times and use AccuWeather Minutecast® to keep up to date with changing weather conditions across your area.
Further flooding may ensue as the heavy thunderstorms focus on the mid-Mississippi Valley surrounding Iowa, Missouri and Illinois on Tuesday.
In addition, these downpours will "make for a very wet commute on Tuesday morning," said Elliott.
Stay updated with Accuweather.com throughout the day to monitor potential hazards that might affect holiday celebrations.
Story written by AccuWeather Meteorologists Brett Rossio and Brett Rathbun
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