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WHIO weather warns of scattered thunderstorms developing across the Miami Valley tonight and into early Friday. A Level 3 Enhanced Risk means damaging winds exceeding 80 mph and large hail are likely. Two waves of severe storms could impact the region, with 1-3 inches of rain possible in the worst areas.
🔥 Quick Facts
- Severe Threat Level: Level 3 of 5 Enhanced Risk for most of Miami Valley through early Friday
- Primary Hazards: Damaging winds over 80 mph, hail exceeding 1 inch, isolated tornadoes in northern areas
- Timeline: First round starts around 8 PM, second wave moves through late evening with heavy rainfall
- Rain Impact: Widespread 1-3 inches possible, flooding concerns for areas with repeated storm clusters
Tornado Watch Issued for Most of Miami Valley Counties
The National Weather Service has issued a Tornado Watch for Champaign, Clark, Darke, Greene, Miami, Montgomery, Preble, Auglaize, Mercer, Shelby, and Logan counties until 11 p.m., extending into Union and Wayne counties in Indiana. This alert means the atmospheric conditions are favorable for rotating storm development. Meteorologist Nick Dunn from WHIO reports that damaging winds and large hail are the primary threats, though an isolated tornado cannot be ruled out, especially in the northern counties.
The far north region, including areas from Celina to Bellefontaine, has the best chance for tornado development tonight due to stronger atmospheric instability and wind shear. As storms move southeast across the rest of the Miami Valley, the tornado threat decreases as the storms lose their rotating structure.
WHIO weather warns of scattered thunderstorms developing today across Miami Valley
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Two Waves of Severe Storms Expected Tonight
The first round of storms may arrive as early as 8 PM over northwestern counties with the greatest tornado potential while conditions remain warmer and more unstable. This initial wave will gradually weaken as it moves south, transitioning hazards from tornadoes to primarily wind and hail threats. The second wave develops later in the evening when temperatures cool significantly, greatly reducing tornado risk but bringing clusters of storms with heavy rainfall that may stall over the same areas.
AES Ohio is urging Miami Valley residents to prepare emergency storm kits ahead of the late-night storms. The company warns of potential for damaging winds, large hail, and isolated tornado development, especially across northern regions still under Enhanced Risk conditions until early Friday morning.
Damaging Winds and Large Hail: Primary Severe Hazards
| Hazard Type | Expected Impact |
| Wind Gusts | Over 80 mph, capable of downed trees and structural damage |
| Hail Size | Large hail with diameters exceeding 1 inch possible |
| Rainfall | Widespread 1-3 inches, localized flooding probable |
| Tornado Risk | Isolated tornadoes possible, especially in north |
Wind is the most significant threat, with meteorologists forecasting sustained gusts capable of toppling trees and knocking down power lines. Large hail stones exceeding 1 inch in diameter will create additional hazards for vehicles and property. The greatest concern overnight involves repeated rounds of heavy rainfall creating flash flooding in areas where multiple storm clusters train over the same locations, potentially impacting 1,000 or more residents with outages.
“Damaging winds and large hail are the top two threats to be concerned about tonight. Expect heavy rainfall to also be a concern, as storms may stall or train over the same areas repeatedly.”
— Meteorologist Nick Dunn, WHIO Weather
How to Stay Safe and Prepare for Tonight’s Storms
Residents should have multiple ways to receive storm warnings since severe weather is occurring during nighttime hours when many will be sleeping. Download the Storm Center 7 Weather app for real-time alerts and activate weather alert settings on phones and smart devices. Keep emergency supplies accessible, including flashlights, batteries, first aid kits, and important documents stored in waterproof containers. Move vehicles into garages if possible to protect from hail damage and falling tree branches.
Position yourself on the interior lowest floor of your home, away from windows, preferably in a hallway or small room. If a tornado warning is issued specifically for your county, move immediately to the safest room available. Monitor WHIO’s Live Doppler 7 Radar in real-time for storm tracking and stay alert for rapidly changing conditions. The National Weather Service emphasizes that outdoor activities after sunset should be canceled or moved indoors, and nighttime outdoor events should be postponed until conditions improve Friday morning.
Will Your Area See the Worst Impacts Tonight?
The northern half of the Miami Valley under the Level 3 Enhanced Risk faces the greatest danger from all severe weather hazards through early Friday. Counties near and north of I-70 will experience the strongest storms with the highest probability of damaging winds and large hail. Southern counties will experience significant weather, but the second wave of storms brings reduced tornado threat and increased flooding concerns from heavy rainfall. WHIO meteorologists stress that not everyone will experience severe impacts, but those in the path of developing storm clusters should expect storms to “pack a punch” with multiple hazards possible in quick succession.
