A low pressure system developed in the lee of the Rocky Mountains on May 9th and moved into the Great Lakes region on May 11th, bringing the chance for some strong to severe thunderstorms for northern Ohio and northwest Pennsylvania. Ahead of this low pressure system, an unseasonably warm air mass settled across the area with high temperature records broken for several sites on May 7-11. As this system moved northeast, a cold front moved across the Midwest, sparking showers and thunderstorms. Several of these thunderstorms reached severe limits and brought damaging winds to some communities in the area.
One of the hardest hit areas was Millcreek Township, Pennsylvania. At about 8pm, a severe thunderstorm moved into western portions of Erie, Pennsylvania. This storm caused significant damage to a mobile home park near the intersection of State Route 5 and Peninsula Drive in Millcreek Township. Many large trees and power lines fell on to trailers. Four mobile homes were destroyed and one received major damage. A fire destroyed one of the impacted trailers, a direct result of the tree and power line damage. In addition, there was a gas leak at the trailer park and evacuations were needed for some trailer homes. Photos from the Millcreek Township Office of Emergency Management of the damage are included below, along with a list of damage reports from several communities in northeast Ohio and northwest Pennsylvania.


Photos Courtesy of the Millcreek Township EMA.
Here is map, showing the locations of all NWS Cleveland Storm Reports from May 11, 2015:
Local Storm Report Map Courtesy of the Iowa Environmental Mesonet (IEM) from Iowa State University.
Here are the preliminary storm reports from May 11, 2015:
PRELIMINARY LOCAL STORM REPORT...SUMMARY
NATIONAL WEATHER SERVICE CLEVELAND OH
237 PM EDT TUE MAY 12 2015
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0401 PM TSTM WND GST 2 SSW FINDLAY 41.02N 83.67W
05/11/2015 M44.00 MPH HANCOCK OH ASOS
KFDY MEASURED A WIND GUST OF 38 KNOTS.
0548 PM TSTM WND DMG MARTINSBURG 40.27N 82.35W
05/11/2015 KNOX OH 911 CALL CENTER
KNOX COUNTY SHERIFF REPORTED SEVERAL TREES DOWN IN AND
NEAR THE TOWN OF MARTINSBURG. SOME TREES WERE LAYING ON
POWER LINES AND THE POWER IS OUT IN THE TOWN OF
MARTINSBURG.
0601 PM TSTM WND GST 4 N MANSFIELD 40.82N 82.51W
05/11/2015 M47.00 MPH RICHLAND OH ASOS
KMFD MEASURED A WIND GUST OF 47 KNOTS.
0615 PM TSTM WND DMG MILLERSBURG 40.55N 81.92W
05/11/2015 HOLMES OH TRAINED SPOTTER
TRAINED WEATHER SPOTTER REPORTED NUMEROUS TREES AND POWER
LINES DOWN ACROSS THE MILLERSBURG AREA.
0650 PM TSTM WND GST PARMA 41.38N 81.73W
05/11/2015 M47.00 MPH CUYAHOGA OH PUBLIC
PUBLIC REPORT OF 41 KNOT WIND GUST IN PARMA. WIND
MEASURED FROM PERSONAL WEATHER STATION.
0654 PM TSTM WND GST 4 NW NORTH CANTON 40.91N 81.45W
05/11/2015 M56.00 MPH SUMMIT OH ASOS
KCAK MEASURED A WIND GUST OF 49 KNOTS.
0708 PM TSTM WND DMG GATES MILLS 41.53N 81.41W
05/11/2015 CUYAHOGA OH 911 CALL CENTER
A COUPLE TREES DOWN IN GATES MILLS...RELAYED BY CHAGRIN
FALLS PD. TIME ESTIMATED BY RADAR.
0710 PM TSTM WND DMG BAINBRIDGE 41.39N 81.34W
05/11/2015 GEAUGA OH LAW ENFORCEMENT
BAINBRIDGE POLICE REPORTED A COUPLE DOWNED TREES IN
BAINBRIDGE TOWNSHIP.
0715 PM TSTM WND DMG SOLON 41.39N 81.44W
05/11/2015 CUYAHOGA OH 911 CALL CENTER
SOME TREES REPORTED DOWN IN SOLON BY SOLON PD.
0718 PM TSTM WND DMG 1 ESE PAINESVILLE 41.72N 81.22W
05/11/2015 LAKE OH PUBLIC
REPORT OF A LARGE TREE AND POWER LINES DOWN AT
INTERSECTION OF RIVERSIDE DR AND NELMAR DR IN PAINESVILLE
TWP...REPORT VIA SOCIAL MEDIA
0730 PM TSTM WND DMG SEBRING 40.92N 81.02W
05/11/2015 MAHONING OH 911 CALL CENTER
SEBRING POLICE DEPARTMENT REPORTED WIDESPREAD TREES AND
POWER LINES DOWN IN TOWN.
0732 PM TSTM WND DMG 2 SE CRAIG BEACH 41.10N 80.95W
05/11/2015 MAHONING OH PUBLIC
REPORT OF SEVERAL LARGE TREES SNAPPED AND LAYING ON POWER
LINES IN THE MILTON TOWNSHIP AREA...TIME IS RADAR
ESTIMATED... REPORT VIA SOCIAL MEDIA.
0733 PM TSTM WND GST 4 NE JEFFERSON 41.78N 80.70W
05/11/2015 M45.00 MPH ASHTABULA OH ASOS
KHZY REPORTED A WIND GUST OF 39 KNOTS.
0737 PM TSTM WND DMG MADISON 41.77N 81.05W
05/11/2015 LAKE OH 911 CALL CENTER
SEVERAL POWER LINES DOWN IN THE TOWN OF MADISON.
0758 PM TSTM WND GST 6 SSE CORTLAND 41.26N 80.67W
05/11/2015 M52.00 MPH TRUMBULL OH ASOS
KYNG REPORTED A 45 KNOT WIND GUST.
0800 PM TSTM WND DMG 4 WSW ERIE 42.11N 80.15W
05/11/2015 ERIE PA EMERGENCY MNGR
MILLCREEK TOWNSHIP EMA DID DAMAGE ASSESSMENT AROUND
INTERSECTION OF ROUTE 5 AND PENINSULA DR. NUMEROUS LARGE
TREES AND POWER LINES WERE DOWNED. SEVERAL TREES FELL ON
TRAILERS AT A MOBILE HOME PARK PROMPTING A GAS LEAK AND
EVACUATIONS OF THE TRAILER PARK. SEVERAL TRAILERS WERE
SEVERELY DAMAGED.
0800 PM TSTM WND DMG GIRARD 41.15N 80.70W
05/11/2015 TRUMBULL OH 911 CALL CENTER
TRUMBULL COUNTY 911 CENTER REPORTED WIDESPREAD TREES AND
POWER LINES DOWN IN TRUMBULL COUNTY. POWER OUTAGES IN
WARREN AND GIRARD. TREES ON MANY HOMES CAUSING ROOF
DAMAGE.
0810 PM TSTM WND GST ERIE 42.13N 80.09W
05/11/2015 E65.00 MPH ERIE PA TRAINED SPOTTER
TRAINED SPOTTER RECORDED AN ESTIMATED 65 MPH WIND GUST IN
ERIE.
0810 PM TSTM WND DMG ERIE 42.13N 80.09W
05/11/2015 ERIE PA TRAINED SPOTTER
TRAINED SPOTTER REPORTED DOWNED AND UPROOTED TREES IN
DOWNTOWN ERIE. SPOTTER ALSO NOTED FLYING CONSTRUCTION
MATERIALS.
0820 PM TSTM WND DMG 5 N CONNEAUT LAKESHORE 41.69N 80.30W
05/11/2015 CRAWFORD PA EMERGENCY MNGR
CRAWFORD COUNTY EMA REPORTED A TREE DOWN ACROSS ROBINSON
ROAD IN SUMMERHILL TOWNSHIP...TIME IS RADAR ESTIMATED.
0820 PM TSTM WND DMG 5 ESE ANDOVER 41.58N 80.48W
05/11/2015 CRAWFORD PA EMERGENCY MNGR
CRAWFORD COUNTY EMA REPORTED A TREE DOWN ACROSS PILGRIM
LANE IN PYMATUNING CENTRAL...TIME IS RADAR ESTIMATED.
0830 PM TSTM WND DMG 2 S EDINBORO 41.85N 80.12W
05/11/2015 CRAWFORD PA TRAINED SPOTTER
LARGE BEECH TREE FELL AT TRAINED SPOTTERS LOCATION 2 S OF
EDINBORO.
0840 PM TSTM WND DMG 2 ENE COCHRANTON 41.54N 80.01W
05/11/2015 CRAWFORD PA EMERGENCY MNGR
CRAWFORD COUNTY EMA REPORTED A DOWNED TREE OFF OF STATE
ROUTE 173 IN WAYNE TOWNSHIP...TIME IS RADAR ESTIMATED.
0910 PM TSTM WND DMG 2 W TITUSVILLE 41.62N 79.72W
05/11/2015 CRAWFORD PA EMERGENCY MNGR
CRAWFORD COUNTY EMA REPORTED A TREE DOWN OFF OF STATE
ROUTE 27 IN OIL CREEK TOWNSHIP...TIME IS RADAR ESTIMATED.
&&
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