Dubuque, Iowa — Far northeastern Iowa, including Dubuque along the Mississippi River, faces a notable severe weather threat Monday. The Storm Prediction Center (SPC) has placed eastern Iowa under an Enhanced Risk (Level 3 of 5) for severe thunderstorms, with Dubuque on the northern edge of the highest-risk zone.

Current conditions Sunday evening in Dubuque are mild (mid-60s°F, light southeast winds). Overnight brings a 40–60% chance of showers and thunderstorms, with lows near 56–59°F and increasing winds.

Risk and Hazards for Dubuque

The SPC Day 2 Outlook highlights an Enhanced Risk across the Middle Mississippi Valley extending into eastern Iowa. Dubuque sits on the northern fringe, where threats are somewhat conditional but still significant.

Primary hazards:

•  Damaging winds: Most likely threat, with gusts of 60–80+ mph possible as storms organize into lines or clusters.

•  Large hail: Golf ball to baseball size with any discrete supercells.

•  Tornadoes: Conditional and lower probability near Dubuque; a few strong tornadoes possible farther south near the lifting warm front.

•  Heavy rain: ¾–1+ inches, raising localized flooding risks, especially in riverfront or low-lying areas.

Timing: Morning showers or remnant storms may limit heating. Main severe window is afternoon into evening (roughly 2–10 PM CDT), with storms potentially starting discrete before turning linear. Overnight storms remain possible.

Key drivers include a deepening surface low, strong shear, rising moisture (dew points 50s–60s°F), and an approaching shortwave trough. Morning convection is the biggest uncertainty—if widespread, it could reduce instability and shift strongest threats south or east.

Local NWS Quad Cities forecasts call for thunderstorms Monday with highs near 68–73°F and southeast winds 15–25 mph (higher gusts).

Tornado Risk

Dubuque specifically: As a northern-edge location, the tornado probability is estimated in the 2–5% range (low to marginal), with isolated higher conditional chances (approaching 5–10%) only if discrete supercells can form and maintain near local boundaries or the warm front. The greatest tornado potential remains south and west of Dubuque, closer to the surface low and warm front in southern/central Iowa. 

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