Powerful thunderstorms capable of damaging winds and large hail will ignite across parts of the Upper Midwest Sunday night.
Heat and humidity has surged northward across Minnesota toward the Canadian border. Meanwhile, a cold front will approach form the west sparking potentially damaging thunderstorms.
Cities and towns in the threat zone include Detroit Lakes, Minn., Grand Rapids, Minn., Embarrass, Minn., and International Falls, Minn. Residents will need to keep their eyes to the sky and be prepared for rapidly changing weather conditions.
The greatest threats from thunderstorms will be blinding downpours and large hail. Thunderstorm wind gusts past 60 mph and hail larger than quarters will accompany the strongest storms.
There could even be a brief tornado touchdown capable of causing significant damage.
Torrential downpours will make driving especially difficult this afternoon and evening. Those who will be driving along Routes 1, 2, 6, 53, and 71 in Minnesota should use extreme caution and slow down during times of intensely heavy rain.
Moreover, heavy rain can cause flash flooding problems, especially in low-lying and poor drainage areas. Never cross a water-covered roadway.
Thunderstorms will eventually track into the Upper Peninsula of Michigan and northern Wisconsin.
Thunderstorms don't have to turn severe to become deadly. Dangerous lightning accompanies even the weakest storms. If you can hear thunder, you are close enough to be struck by lightning. Seek shelter indoors immediately.
Vacationers in or heading to the many resorts in Minnesota, Wisconsin, and the Upper Peninsula of Michigan will want to keep track of the storms throughout Sunday night. Don't be caught outside near a body of water during a thunderstorm.
A cold front will pass through the region later tonight, ushering cooler and drier air into the region for the start of the new week. However, hot and steamy air ahead of the front will set the stage for thunderstorms to explode and cause damage.
Heed all watches and warnings and be sure to have a plan of action before severe weather strikes. Know where to go and what to do in order to keep you and your family safe.
Keep checking back with AccuWeather.com for all of the latest severe weather updates.
As July draws to a close, a rare storm system swinging up from the Deep South will bring downpours that will break the back of the heat wave in much of the northeastern United States.
A renewed risk of severe weather will threaten portions of the north-central United States into midweek.
Heavy downpours will raise the concern for flash flooding along the Gulf Coast and lower Mississippi Valley through midweek.
A stifling heat wave will remain entrenched across the Northeast much of this week, despite a brief reprieve in humidity for some.
Dangerous heat will surge northward and send temperatures rising across the northwestern United States this week.
Severe thunderstorms rumbled through the Northeast on Monday, lashing the region with damaging winds while also unleashing heavy downpours that triggered flash flooding.
Wildwood, NJ (2000)
More than 4" of rain.
New Holstein, WI (2007)
Strong thunderstorm winds blew two airplanes into one another at the local airport.
New York/MA (1819)
Two simultaneous cloudbursts, 45 miles apart; A bucket survey claimed 15" of rain fell at Catskill, NY. Highways were completely washed out. One washout started west of the old Albany Post Road and spread eastward across the road until it was 190 feet wide and 80 feet deep in a distance of 160 paces. At Westfield Valley, "suddenly the windows of heaven seemed to have been opened and the rain fell in such torrents that in less than 5 hours, Westfield River rose at least 20 feet above its usual height at low water. The river overflowed its banks with great rapidity and violence, sweeping away every bridge, fence and building which opposed its current."