...NWS Damage Survey for 03/11/26 Prospect Hills MD Tornado... .Prospect Hills, MD Tornado... Rating: EF-0 Estimated Peak Wind: 80 mph Path Length /statute/: 0.3 miles Path Width /maximum/: 75 yards Fatalities: 0 Injuries: 0 Start Date: Mar 11 2026 Start Time: 7:14 PM EDT Start Location: Prospect Hills / Carroll County / MD Start Lat/Lon: 39.357 / -76.893 End Date: Mar 11 2026 End Time: 7:15 PM EDT End Location: Prospect Hills / Carroll County / MD End Lat/Lon: 39.360 / -76.890 Survey Summary: A supercell thunderstorm moved through northern Montgomery, northwestern Howard, and southeast Carroll Counties in Maryland during the evening hours of Wednesday March 11, 2026. The bow echo and associated downbursts/thunderstorm wind gusts caused sporadic tree damage from 60 to 80 mph gusts, and created both a brief EF1 tornado near Cooksville in northwestern Howard County for which there is a previous report, and this EF0 tornado in Prospect Hills MD, in southeastern Carroll County in the Patapsco Valley State Park. As the storm crossed into southeastern Carroll County, it produced a brief tornado in Patapsco Valley State Park, with an EF0 touching down at 7:14 pm. In the park, just east of Marriottsville Rd, there were numerous trees uprooted and snapped. The most intense area of tree damage was right along the entrance drive in the McKeldin Area. Peak winds in this area were estimated to be 80 mph. Several trees were snapped down in multiple directions in a path up to 75 yards wide. Shortly after, the tornado lifted at 7:15 pm and no further tornadic damage was noted. However, sporadic wind damage in the direction of storm motion continued to occur with the winds from the severe thunderstorm. Special thanks to Montgomery and Carroll County Offices of Emergency Management for their assistance and damage assessments. && EF Scale: The Enhanced Fujita Scale classifies tornadoes into the following categories: EF0.........65 to 85 mph EF1.........86 to 110 mph EF2.........111 to 135 mph EF3.........136 to 165 mph EF4.........166 to 200 mph EF5.........>200 mph
