MINNEAPOLIS, MINNESOTA — An extraordinary and potentially historic rainfall event is shaping up across the Northern Plains, Upper Midwest, and Ohio Valley for the Monday to Monday June 8 through June 15, 2026 timeframe, with weekly rainfall totals forecast to reach 7 to 15 inches across a broad swath covering Minnesota, Iowa, Missouri, Illinois, and Tennessee as extra Caribbean moisture slides northward and fuels a prolonged and active precipitation pattern across the region.
Exceptional 7 to 15 Inch Rainfall Totals Forecast Across Northern Plains and Upper Midwest
The weekly rainfall total forecast map for Monday June 8 through Monday June 15 shows deep red and purple precipitation values of 7 to 15 inches concentrated across the Northern Plains and upper Midwest covering the Dakotas, Minnesota, Iowa, Nebraska, Missouri, and into Illinois and Indiana. The most extreme totals in the deepest red shading are centered across the northern Plains and upper Midwest corridor where multiple rounds of severe weather and heavy rain producing storm systems are expected to track through the region during the seven-day period. These rainfall amounts represent a potentially significant flooding concern for communities across the affected region, particularly given the already active storm pattern that has been targeting the Northern Plains repeatedly in recent days.
Caribbean Moisture Surge Providing Extra Precipitation Fuel Through the Week
A notable feature of this week’s rainfall setup is the injection of extra moisture sliding northward from the Caribbean into the central and eastern United States. This Caribbean moisture surge will enhance precipitable water values across the region and contribute to heavier rainfall rates with each storm system that tracks through the corridor during the Monday to Monday period. Forecasters note that nothing tropical is expected from this moisture surge, but the additional Caribbean moisture on tap will act as an amplifier for rainfall totals across the Northern Plains and Upper Midwest throughout the week.
Ohio Valley and Tennessee Corridor Also Seeing Heavy Purple Rainfall Values This Week
Beyond the primary Northern Plains and Upper Midwest heavy rainfall zone, the Ohio Valley and Tennessee corridor are also showing significant purple rainfall values of 4 to 7 inches on the weekly total map, covering Tennessee, Kentucky, West Virginia, and surrounding states. A separate area of elevated rainfall is also indicated across southern Florida associated with the Pacific crossover moisture and Bay of Campeche activity mentioned in the forecast discussion, with totals of 3 to 5 inches possible across the Florida peninsula during the same Monday to Monday window.
Flood Prone Areas Across the Northern Plains and Upper Midwest Should Prepare Now
With rainfall totals of 7 to 15 inches possible across the Northern Plains and Upper Midwest between Monday June 8 and Monday June 15, flood-prone communities across Minnesota, Iowa, Nebraska, Missouri, and surrounding states should begin monitoring updated NWS flood outlooks closely and take proactive steps to prepare for potentially significant flooding impacts during this extraordinary week-long precipitation event.
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