August 11 to August 13 Severe Weather

Overview

A warm and moist air mass set up across the region, characterized by dew points in the lower to mid-70s and instability parameters in the moderate to strong range. Multiple rounds of strong to severe thunderstorms moved across the area Wednesday morning into Friday, with portions of the region outlooked in a SPC Enhanced Risk for two out of the three days, mainly for a damaging wind threat, though a few instances of large hail did occur, given the large instability in the hail growth zone (-10C to -30C layer). Deep layer shear was relatively weak through all three days, though modest mid-level flow around 35 to 40 knots helped to sustain generally multi-cell and cold pool-driven convection, along with nocturnal mesoscale convective systems, which helped to provide surface lifting mechanisms and enhanced low to mid-level shear profiles.

Wednesday, August 11 was characterized by having two main rounds of severe convection; one in the morning and one in the afternoon. The Storm Prediction Center (SPC) increased a portion of our area under an enhanced risk at the 1230 PM update. The convection in the afternoon proved to be the most widespread and strongest, with NWS CLE issuing our first 80 mph WEA-generated severe thunderstorm warning since implementation this year which was credited to saving at least one person’s life. The lakeshore areas were hit particularly hard with widespread tree damage noted.

Thursday, August 12 had two main rounds of severe convection; one in the morning and one in the afternoon. The SPC increased a portion of our area under an enhanced risk at the 1230 PM update. The strongest storms formed generally along and east of the I-77 corridor as they moved east into PA by the evening hours. Most storms exhibited mainly a damaging wind threat, though one storm produced large to very large hail across a small portion of Northwest Pennsylvania from a left-splitting cell. Golf ball-sized hail was reported in the Titusville, PA area.

Finally, Friday, August 13 had one main round of strong to severe convection in the late afternoon and evening. The main threat from this convection was damaging winds, though heavy rain also occurred, with one flood advisory issued. This was the end of a very busy weather week, with a cold front finally moving east across the region by nighttime.

Infrared "sandwich" satellite loop (visible and infrared) of the several rounds of strong to severe convection that developed between the days of August 11 and August 13, 2021, and impacted the region.

SPC 1630Z (1230 PM ET) day 1 severe thunderstorm outlooks from August 11 (left) and August 12, 2021 (right).

Photos & Video
Radar
Storm Reports
Environment

Photos & Video


Golf-ball size hail in Titusville, PA on Aug 12, 2021. (Crawford County, PA EM)	Golf-ball size hail in Hydeville, PA on Aug 12, 2021. (Crawford County, PA EM)	Roof damage in Gordan Square at W 58 St from the afternoon storms that rolled across northern OH on Aug 11, 2021. (Kelly Dobeck)	Picture of a shelf cloud on Aug 11, 2021 in Avon Lake, OH before severe storms rolled across the lakeshore areas of northern OH. (Zakk Sheehan)


Storm damage in Liberty Township, Trumbull County, OH from the storms that rolled across the area on the evening of Aug 13, 2021. (Jim T)	Tree uprooted onto house from the severe storms that rolled through Bay Village, OH on Aug 11, 2021. (Kristin Mazur)	Picture of a sheld cloud on Aug 11, 2021 in Lorain, OH before severe storms rolled across the region. (Russ Marty)	Gas station canopy down from thunderstorm winds in Hudson, OH on Aug 13, 2021. (Mark Watt)

Radar

Three days of radar, showing the multiple rounds of storms across the region


Radar loop with severe and flood warnings on Aug 11, 2021 from 6 AM to 9 PM.	Radar loop with severe and flood warnings on Aug 12, 2021 from 6 AM to 9 PM.	Radar loop for severe and flood warnings on Aug 13, 2021 from 3 PM to 10 PM.

Storm Reports

LSR Map (Aug 11)

LSR Map (Aug 12)

LSR Map (Aug 13)

LSR Summary (MAP) (Aug 11-13)

000
NWUS51 KCLE 141416
LSRCLE

PRELIMINARY LOCAL STORM REPORT...SUMMARY
NATIONAL WEATHER SERVICE CLEVELAND OH
1016 AM EDT SAT AUG 14 2021

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0237 AM     LIGHTNING        2 ENE PEMBERVILLE       41.43N 83.42W
08/11/2021                   SANDUSKY           OH   TRAINED SPOTTER  

            LIGHTNING HIT A HOME AND POWER POLE NEAR THE 
            INTERSECTION OF US 23 AND SR 105 IN SANDUSKY 
            COUNTY. 

0241 AM     TSTM WND DMG     LUCKEY                  41.45N 83.49W
08/11/2021                   WOOD               OH   TRAINED SPOTTER  

            12 INCH DIAMETER TREE DOWN ON MAIN STREET IN 
            LUCKEY. 

0243 AM     TSTM WND GST     1 SSE WALBRIDGE         41.57N 83.48W
08/11/2021  M56 MPH          WOOD               OH   ASOS             

            ASOS STATION KTDZ TOLEDO EXECUTIVE AIRPORT. 

0245 AM     TSTM WND DMG     GENOA                   41.52N 83.36W
08/11/2021                   OTTAWA             OH   EMERGENCY MNGR   

            MULTIPLE DOWNED TREES AND DAMAGE TO A BARN 
            ROOF IN GENOA. 

0248 AM     MARINE TSTM WIND 1 W HARBOR VIEW         41.69N 83.47W
08/11/2021  M49 MPH          LUCAS              OH   C-MAN STATION    

            C-MAN STATION THRO1 TOLEDO, OH. 

0257 AM     TSTM WND DMG     1 NNE BALLVILLE         41.34N 83.13W
08/11/2021                   SANDUSKY           OH   TRAINED SPOTTER  

            TREE DOWN AT THE HAYES CENTER COMPLEX IN 
            FREMONT AND SEVERAL WIRES DOWN ON JUNE ST IN 
            BALLVILLE TOWNSHIP. 

0305 AM     TSTM WND GST     7 N OAK HARBOR          41.61N 83.12W
08/11/2021  M44 MPH          OTTAWA             OH   PUBLIC           

            *DELAYED REPORT* PERSONAL WEATHER STATION. 

0834 AM     TSTM WND DMG     1 SSW FINDLAY           41.03N 83.64W
08/11/2021                   HANCOCK            OH   TRAINED SPOTTER  

            SEVERAL LARGE LIMBS DOWN AND ONE UTILITY 
            POLE BROKEN OFF. TIME ESTIMATED FROM RADAR. 

0900 AM     TSTM WND DMG     FINDLAY                 41.04N 83.64W
08/11/2021                   HANCOCK            OH   911 CALL CENTER  

            NUMEROUS TREES DOWN. 

0950 AM     TSTM WND DMG     3 NE WILLARD            41.09N 82.69W
08/11/2021                   HURON              OH   TRAINED SPOTTER  

            MULTIPLE TRESS DOWN ALONG PERU OLENA RD. 

0950 AM     TSTM WND DMG     WILLARD                 41.05N 82.72W
08/11/2021                   HURON              OH   TRAINED SPOTTER  

            NUMEROUS TREES DOWN. 

1028 AM     TSTM WND DMG     1 SSW MANSFIELD         40.75N 82.54W
08/11/2021                   RICHLAND           OH   PUBLIC           

            ONE LARGE LIMB DOWN. 

1051 AM     TSTM WND GST     2 SSW GREEN             40.92N 81.45W
08/11/2021  M54 MPH          SUMMIT             OH   ASOS             

            ASOS STATION KCAK AKRON-CANTON REGIONAL 
            ARPT. 

1114 AM     MARINE TSTM WIND 6 WNW MARBLEHEAD        41.55N 82.83W
08/11/2021  M45 MPH          OTTAWA             OH   PUBLIC           

            *DELAYED REPORT* PERSONAL WEATHER STATION. 

0326 PM     TSTM WND DMG     2 NW HOLLAND            41.64N 83.74W
08/11/2021                   LUCAS              OH   TRAINED SPOTTER  

            LIVE 18 INCH DIAMETER LIMB DOWN. 

0326 PM     TSTM WND GST     2 WNW ROSSFORD          41.61N 83.60W
08/11/2021  M72 MPH          LUCAS              OH   TRAINED SPOTTER  



0328 PM     TSTM WND DMG     3 NNW NORTHWOOD         41.64N 83.51W
08/11/2021                   LUCAS              OH   PUBLIC           

            LARGE TREE DOWN NEAR INTERSECTION OF SPRING 
            GROVE AND GREENWOOD ROADS. 

0349 PM     TSTM WND DMG     3 NNE OTTAWA HILLS      41.71N 83.62W
08/11/2021                   LUCAS              OH   PUBLIC           

            3-INCH TREE LIMBS BROKEN; POWER POLES 
            BROKEN. 

0352 PM     HAIL             MOUNT BLANCHARD         40.90N 83.56W
08/11/2021  E0.75 INCH       HANCOCK            OH   TRAINED SPOTTER  

            ESTIMATED 30-40 MPH WINDS. 

0356 PM     TSTM WND DMG     OAK HARBOR              41.51N 83.15W
08/11/2021                   OTTAWA             OH   PUBLIC           

            DAMAGE TO A ROOF ON A HOME. NUMEROUS 
            SHINGLES LIFTED AND TORN OFF. 

0358 PM     TSTM WND DMG     10 NW MARBLEHEAD        41.65N 82.82W
08/11/2021                   OTTAWA             OH   LAW ENFORCEMENT  

            NUMEROUS TREES AND POWERLINES DOWN ACROSS 
            SOUTH BASS ISLAND. 

0400 PM     TSTM WND GST     2 ENE PORT CLINTON      41.52N 82.89W
08/11/2021  M51 MPH          OTTAWA             OH   PUBLIC           

            *DELAYED REPORT* PERSONAL WEATHER STATION. 

0402 PM     TSTM WND DMG     4 NNE OTTAWA HILLS      41.72N 83.62W
08/11/2021                   LUCAS              OH   TRAINED SPOTTER  

            LARGE TREE DOWN. 

0410 PM     TSTM WND DMG     2 NE ROSSFORD           41.62N 83.53W
08/11/2021                   LUCAS              OH   TRAINED SPOTTER  

            DAMAGE TO BUILDING ROOF. 

0416 PM     MARINE TSTM WIND 6 N BAY VIEW            41.55N 82.83W
08/11/2021  M42 MPH          OTTAWA             OH   PUBLIC           

            *DELAYED REPORT* PERSONAL WEATHER STATION. 

0422 PM     TSTM WND GST     6 N MARBLEHEAD          41.61N 82.72W
08/11/2021  M67 MPH          ERIE               OH   PUBLIC           

            *DELAYED REPORT* PERSONAL WEATHER STATION. 

0422 PM     TSTM WND DMG     GIBSONBURG              41.39N 83.33W
08/11/2021                   SANDUSKY           OH   TRAINED SPOTTER  

            9 INCH DIAMETER, 30 FOOT TREE DOWN ACROSS 
            ROAD AND POWER LINES. 

0427 PM     TSTM WND DMG     BUCYRUS                 40.81N 82.98W
08/11/2021                   CRAWFORD           OH   TRAINED SPOTTER  

            LARGE TREE DOWN. 

0429 PM     TSTM WND DMG     BUCYRUS                 40.81N 82.98W
08/11/2021                   CRAWFORD           OH   PUBLIC           

            LARGE TREE DOWN ON SPRING STREET. 

0432 PM     TSTM WND DMG     1 ENE MARION            40.59N 83.11W
08/11/2021                   MARION             OH   PUBLIC           

            MULTIPLE TREES DOWN ON THE EAST SIDE OF 
            MARION. 

0433 PM     TSTM WND GST     3 NNE LINNDALE          41.48N 81.74W
08/11/2021  E80 MPH          CUYAHOGA           OH   PUBLIC           

            TREE FELL ON A TRUCK. 

0433 PM     TSTM WND GST     WILLARD                 41.05N 82.72W
08/11/2021  E50 MPH          HURON              OH   TRAINED SPOTTER  



0435 PM     TSTM WND DMG     PLYMOUTH                40.99N 82.67W
08/11/2021                   RICHLAND           OH   EMERGENCY MNGR   

            ONE HOME WAS SEVERELY DAMAGE WITH AN 
            EXTERIOR WALL COLLAPSED. A DETACHED GARAGE 
            WAS HEAVILY DAMAGE. NUMEROUS TREES WERE 
            BLOWN DOWN ACROSS THE COUNTY. 

0451 PM     TSTM WND DMG     2 W HURON               41.40N 82.60W
08/11/2021                   ERIE               OH   PUBLIC           

            1-INCH TREE LIMBS BROKEN; SHINGLES BLOWN 
            OFF. 

0452 PM     TSTM WND GST     3 NNE LORAIN            41.48N 82.16W
08/11/2021  M45 MPH          LORAIN             OH   PUBLIC           

            *DELAYED REPORT* PERSONAL STATION. 

0452 PM     TSTM WND GST     4 N MANSFIELD           40.82N 82.52W
08/11/2021  M53 MPH          RICHLAND           OH   ASOS             

            ASOS STATION KMFD MANSFIELD. 

0453 PM     TSTM WND DMG     1 ESE MOUNT GILEAD      40.55N 82.82W
08/11/2021                   MORROW             OH   PUBLIC           

            TREES SNAPPED AND DAMAGE TO METAL ROOF. 

0457 PM     TSTM WND DMG     AVON LAKE               41.49N 82.02W
08/11/2021                   LORAIN             OH   PUBLIC           

            LARGE TREE UPROOTED WHICH TOOK DOWN 
            POWERLINES AND A FENCE. 

0457 PM     TSTM WND DMG     AVON LAKE               41.49N 82.02W
08/11/2021                   LORAIN             OH   PUBLIC           

            NUMEROUS TREES SNAPPED IN HALF VIA VIDEO 
            SUBMITTED ON SOCIAL MEDIA. 

0504 PM     TSTM WND DMG     4 W LEXINGTON           40.68N 82.66W
08/11/2021                   MORROW             OH   TRAINED SPOTTER  

            SEVERAL TREES DOWN. 

0504 PM     TSTM WND DMG     MANSFIELD               40.76N 82.52W
08/11/2021                   RICHLAND           OH   TRAINED SPOTTER  

            SEVERAL LARGE TREES DOWN AROUND CITY. 

0506 PM     TSTM WND DMG     ELYRIA                  41.38N 82.11W
08/11/2021                   LORAIN             OH   PUBLIC           

            MULTIPLE TREES SNAPPED AND BLOCKING ROADWAYS 
            ACROSS ELYRIA. 

0506 PM     TSTM WND DMG     1 NW WESTLAKE           41.47N 81.95W
08/11/2021                   CUYAHOGA           OH   PUBLIC           

            LARGE TREE DOWN ACROSS CLEMENS ROAD. 

0506 PM     TSTM WND DMG     2 WNW ROCKY RIVER       41.48N 81.89W
08/11/2021                   CUYAHOGA           OH   BROADCAST MEDIA  

            LARGE TREE FELL ONTO HOME CAUSING ROOF 
            DAMAGE. 

0506 PM     TSTM WND DMG     BAY VILLAGE             41.49N 81.92W
08/11/2021                   CUYAHOGA           OH   911 CALL CENTER  

            EXTENSIVE TREE AND POWERLINE DAMAGE ACROSS 
            THE CITY. 

0509 PM     TSTM WND DMG     FREDERICKTOWN           40.48N 82.55W
08/11/2021                   KNOX               OH   911 CALL CENTER  

            NUMEROUS TREES AND POWERLINES DOWN 
            THROUGHOUT FREDERICKTOWN. 

0509 PM     TSTM WND DMG     3 SW WESTLAKE           41.43N 81.97W
08/11/2021                   CUYAHOGA           OH   PUBLIC           

            LARGE TREE UPROOTED AND FELL ONTO HOUSE ON 
            HILLIARD BLVD. 

0511 PM     TSTM WND GST     2 WNW BAY VILLAGE       41.50N 81.96W
08/11/2021  E75 MPH          CUYAHOGA           OH   NWS EMPLOYEE     

            ESTIMATED 70-75 MPH WIND GUST. 

0511 PM     TSTM WND DMG     2 WNW BAY VILLAGE       41.50N 81.96W
08/11/2021                   CUYAHOGA           OH   NWS EMPLOYEE     

            MULTIPLE TREES AND POWER POLES/LINES DOWN. 

0512 PM     TSTM WND GST     BUTLER                  40.59N 82.42W
08/11/2021  E70 MPH          RICHLAND           OH   TRAINED SPOTTER  



0518 PM     TSTM WND DMG     3 W CLEVELAND           41.48N 81.73W
08/11/2021                   CUYAHOGA           OH   BROADCAST MEDIA  

            MULTIPLE TREES SNAPPED AND A ROOF TORN OFF A 
            WAREHOUSE IN GORDON SQUARE. 

0518 PM     TSTM WND DMG     LAKEWOOD                41.48N 81.80W
08/11/2021                   CUYAHOGA           OH   PUBLIC           

            NUMEROUS LARGE TREES AND POWER LINES 
            REPORTED DOWN ACROSS THE CITY. 

0518 PM     TSTM WND DMG     LAKEWOOD                41.48N 81.80W
08/11/2021                   CUYAHOGA           OH   NWS EMPLOYEE     

            SNAPPED TREE FELL ONTO GARAGE. 

0518 PM     TSTM WND DMG     1 SW LINNDALE           41.43N 81.78W
08/11/2021                   CUYAHOGA           OH   PUBLIC           

            POWER POLES SNAPPED IN HALF AND LINES DOWN 
            ON WEST 130. 

0520 PM     TSTM WND DMG     MOUNT VERNON            40.39N 82.48W
08/11/2021                   KNOX               OH   911 CALL CENTER  

            NUMEROUS TREES AND POWERLINES DOWN ACROSS 
            THE CITY OF MOUNT VERNON. 

0520 PM     TSTM WND DMG     1 NNE EUCLID            41.61N 81.51W
08/11/2021                   CUYAHOGA           OH   LAW ENFORCEMENT  

            LARGE TREE FELL ONTO HOUSE RESULTING IN A 
            HOLE IN THE ROOF. 

0520 PM     TSTM WND DMG     1 ESE EUCLID            41.59N 81.50W
08/11/2021                   CUYAHOGA           OH   LAW ENFORCEMENT  

            LARGE TREE FELL CAUSING MAJOR DAMAGE TO 3 
            VEHICLES. 

0523 PM     TSTM WND DMG     1 WSW BRATENAHL         41.55N 81.61W
08/11/2021                   CUYAHOGA           OH   LAW ENFORCEMENT  

            LARGE TREE FELL ONTO VEHICLE ON HANNA LANE. 

0523 PM     TSTM WND DMG     PARMA                   41.38N 81.73W
08/11/2021                   CUYAHOGA           OH   PUBLIC           

            LARGE TREE UPROOTED WHICH CLIPPED A CORNER 
            OF A HOUSE. 

0525 PM     TSTM WND DMG     DANVILLE                40.45N 82.26W
08/11/2021                   KNOX               OH   911 CALL CENTER  

            NUMEROUS TREES AND POWERLINES DOWN 
            THROUGHOUT DANVILLE. 

0525 PM     TSTM WND DMG     1 WNW LYNDHURST         41.52N 81.51W
08/11/2021                   CUYAHOGA           OH   PUBLIC           

            LARGE TREE SNAPPED. 

0525 PM     TSTM WND DMG     MENTOR                  41.69N 81.34W
08/11/2021                   LAKE               OH   TRAINED SPOTTER  

            MULTIPLE LARGE TREE LIMBS DOWN, ONE ON A 
            VEHICLE. 

0527 PM     TSTM WND GST     3 N CLEVELAND           41.52N 81.68W
08/11/2021  M55 MPH          CUYAHOGA           OH   ASOS             

            ASOS STATION KBKL CLEVELAND. 

0530 PM     TSTM WND DMG     MENTOR                  41.69N 81.33W
08/11/2021                   LAKE               OH   PUBLIC           

            LARGE TREE SNAPPED. 

0532 PM     TSTM WND DMG     GLENMONT                40.52N 82.09W
08/11/2021                   HOLMES             OH   EMERGENCY MNGR   

            TREES AND WIRES DOWN ON SR520. 

0532 PM     TSTM WND DMG     1 SW KIRTLAND HILLS     41.63N 81.33W
08/11/2021                   LAKE               OH   PUBLIC           

            LARGE TREE DOWN ACROSS SANCTUARY ROAD. 

0533 PM     TSTM WND DMG     1 WSW SHAKER HEIGHTS    41.47N 81.57W
08/11/2021                   CUYAHOGA           OH   AMATEUR RADIO    

            MANY TREE LIMBS AND SEVERAL WHOLE TREES DOWN 
            IN SHAKER HEIGHTS. TIME ESTIMATED VIA RADAR. 

0537 PM     TSTM WND DMG     3 W KILLBUCK            40.50N 82.03W
08/11/2021                   HOLMES             OH   EMERGENCY MNGR   

            MULTIPLE TREES AND WIRES DOWN ON CR 6 
            BETWEEN KILLBUCK AND GLENMONT. 

0540 PM     TSTM WND GST     1 N WADSWORTH           41.04N 81.73W
08/11/2021  E65 MPH          MEDINA             OH   TRAINED SPOTTER  

            ESTIMATED 60-65 MPH WIND GUST, TREE LIMBS 
            DOWN AND SHINGLES OFF BUILDINGS. 

0546 PM     TSTM WND DMG     1 W SOLON               41.39N 81.46W
08/11/2021                   CUYAHOGA           OH   LAW ENFORCEMENT  

            LARGE TREE LIMB FELL ONTO CAR ON SOLON ROAD. 

0547 PM     TSTM WND GST     4 W ASHTABULA           41.88N 80.87W
08/11/2021  M41 MPH          ASHTABULA          OH   PUBLIC           

            *DELAYED REPORT* PERSONAL WEATHER STATION. 

0555 PM     TSTM WND DMG     4 ENE CHARDON           41.61N 81.14W
08/11/2021                   GEAUGA             OH   AMATEUR RADIO    

            TREE DOWN INTO WIRES. 

0557 PM     TSTM WND DMG     TALLMADGE               41.10N 81.42W
08/11/2021                   SUMMIT             OH   FIRE DEPT/RESCUE 

            NUMEROUS TREES AND POWERLINES DOWN ACROSS 
            THE CITY. 

0557 PM     TSTM WND DMG     2 N GREEN               40.96N 81.44W
08/11/2021                   SUMMIT             OH   PUBLIC           

            TREE DOWN AND MULTIPLE LARGE BRANCHES 
            SNAPPED AT PRESTWICK COUNTRY CLUB. 

0604 PM     TSTM WND DMG     5 NNE WEST FARMINGTON   41.46N 80.95W
08/11/2021                   TRUMBULL           OH   911 CALL CENTER  

            NUMEROUS TREES AND POWERLINES DOWN THROUGH 
            MESOPOTAMIA TOWNSHIP. 

0606 PM     TSTM WND DMG     HIRAM                   41.31N 81.14W
08/11/2021                   PORTAGE            OH   911 CALL CENTER  

            NUMEROUS TREES AND POWERLINES REPORTED DOWN 
            ACROSS HIRAM AND HIRAM TOWNSHIP. 

0608 PM     TSTM WND GST     2 NNE CONNEAUT          41.96N 80.55W
08/11/2021  M54 MPH          ASHTABULA          OH   PUBLIC           

            *DELAYED REPORT* PERSONAL WEATHER STATION. 

0609 PM     TSTM WND DMG     3 ENE GARRETTSVILLE     41.31N 81.04W
08/11/2021                   PORTAGE            OH   911 CALL CENTER  

            NUMEROUS TREES AND POWERLINE REPORTED DOWN 
            ACROSS NELSON TOWNSHIP. 

0611 PM     TSTM WND DMG     GARRETTSVILLE           41.28N 81.10W
08/11/2021                   PORTAGE            OH   911 CALL CENTER  

            NUMEROUS TREES AND POWERLINES DOWN 
            THROUGHOUT GARRETTSVILLE. 

0623 PM     TSTM WND DMG     8 NNW ORANGEVILLE       41.45N 80.58W
08/11/2021                   TRUMBULL           OH   911 CALL CENTER  

            NUMEROUS TREES AND POWERLINES DOWN ACROSS 
            KINSMAN TOWNSHIP. 

0623 PM     TSTM WND DMG     1 SSE ASHTABULA         41.87N 80.79W
08/11/2021                   ASHTABULA          OH   PUBLIC           

            3-INCH TREE LIMBS BROKEN; POWER POLES 
            BROKEN. 

0632 PM     TSTM WND DMG     CONNEAUT LAKE           41.60N 80.31W
08/11/2021                   CRAWFORD           PA   911 CALL CENTER  

            NUMEROUS TREES REPORTED DOWN ACROSS CONNEAUT 
            LAKE. 

0635 PM     TSTM WND DMG     4 WSW MEADVILLE         41.63N 80.22W
08/11/2021                   CRAWFORD           PA   911 CALL CENTER  

            NUMEROUS TREES REPORTED DOWN ACROSS VERNON 
            TOWNSHIP. 

0639 PM     TSTM WND DMG     2 S EDINBORO            41.84N 80.12W
08/11/2021                   CRAWFORD           PA   TRAINED SPOTTER  

            SEVERAL 8 INCH DIAMETER TREES SNAPPED OFF 
            AND ESTIMATED 50-60 MPH WIND GUST. 

0640 PM     TSTM WND DMG     1 NE CONNEAUT LAKESHORE 41.63N 80.30W
08/11/2021                   CRAWFORD           PA   PUBLIC           

            DELAYED REPORT AND TIME ESTIMATED VIA RADAR. 
            PROBABLE DOWNBURST DAMAGED A BOAT AND TWO 
            DOCKS, BLEW OUT A HOUSE WINDOW, AND DOWNED 
            BRANCHES ONTO A PORCH, DAMAGING IT. 

0644 PM     TSTM WND DMG     BROOKFIELD CENTER       41.24N 80.56W
08/11/2021                   TRUMBULL           OH   911 CALL CENTER  

            NUMEROUS TREES AND POWERLINES REPORTED DOWN 
            ACROSS BROOKFIELD CENTER. 

0650 PM     TSTM WND DMG     COCHRANTON              41.52N 80.05W
08/11/2021                   CRAWFORD           PA   911 CALL CENTER  

            NUMEROUS TREES REPORTED DOWN THROUGHOUT THE 
            CITY OF COCHRANTON. 

0739 AM     NON-TSTM WND GST 4 W ASHTABULA           41.88N 80.87W
08/12/2021  M46 MPH          ASHTABULA          OH   PUBLIC           

            *DELAYED REPORT* PERSONAL WEATHER STATION. 

0918 AM     TSTM WND GST     1 NNW FAIRPORT HARBOR   41.76N 81.28W
08/12/2021  M50 MPH          LAKE               OH   BUOY             

            BUOY STATION FAIO1 FAIRPORT, OH. 

0918 AM     TSTM WND GST     1 NNW FAIRPORT HARBOR   41.76N 81.28W
08/12/2021  M50 MPH          LAKE               OH   BUOY             

            BUOY STATION FAIO1 FAIRPORT, OH. 

0925 AM     HAIL             ASHLAND                 40.87N 82.32W
08/12/2021  U0.75 INCH       ASHLAND            OH   TRAINED SPOTTER  

            0.75 INCH HAIL. 

1032 AM     TSTM WND DMG     2 SE BAINBRIDGE         41.36N 81.31W
08/12/2021                   GEAUGA             OH   911 CALL CENTER  

            LARGE BRANCH AND UTILITY WIRES DOWN. 

1038 AM     TSTM WND DMG     6 NW HIRAM              41.38N 81.22W
08/12/2021                   GEAUGA             OH   911 CALL CENTER  

            TREE DOWN ON WIRES. 

1100 AM     TSTM WND DMG     5 S ORWELL              41.46N 80.87W
08/12/2021                   TRUMBULL           OH   FIRE DEPT/RESCUE 

            SEVERAL TREES DOWN. 

0351 PM     TSTM WND DMG     2 ESE PENINSULA         41.22N 81.51W
08/12/2021                   SUMMIT             OH   911 CALL CENTER  

            TREE DOWN. TIME ESTIMATED FROM RADAR. 

0357 PM     TSTM WND DMG     2 NE CUYAHOGA FALLS     41.19N 81.49W
08/12/2021                   SUMMIT             OH   TRAINED SPOTTER  

            SEVERAL LARGE LIMBS DOWN AND 8 INCH DIAMETER 
            TREES SNAPPED OFF. 

0411 PM     TSTM WND DMG     3 SW SILVER LAKE        41.13N 81.50W
08/12/2021                   SUMMIT             OH   911 CALL CENTER  

            TREE DOWN ON GARAGE. 

0414 PM     TSTM WND DMG     2 SW MUNROE FALLS       41.12N 81.47W
08/12/2021                   SUMMIT             OH   911 CALL CENTER  

            LARGE LIMB DOWN. 

0420 PM     TSTM WND DMG     1 SSW HUBBARD           41.14N 80.58W
08/12/2021                   TRUMBULL           OH   AMATEUR RADIO    

            TREE DOWN AT LEWIS AVE. AND LINCOLN AVE. IN 
            MAPLEWOOD PARK. TIME ESTIMATED VIA RADAR. 

0444 PM     TSTM WND DMG     WINDHAM                 41.24N 81.04W
08/12/2021                   PORTAGE            OH   BROADCAST MEDIA  

            TREE FELL ONTO BACKYARD POOL. 

0449 PM     TSTM WND DMG     3 NNW TURNPIKE INTERCHA 41.26N 80.95W
08/12/2021                   TRUMBULL           OH   911 CALL CENTER  

            TREE DOWN ON WIRES. 

0514 PM     HAIL             HYDETOWN                41.65N 79.73W
08/12/2021  E1.75 INCH       CRAWFORD           PA   PUBLIC           

            DELAYED REPORT. APPROXIMATELY GOLF BALL-SIZE 
            HAIL PER PHOTO. TIME ESTIMATED VIA RADAR. 

0518 PM     HAIL             2 NNE TITUSVILLE        41.66N 79.66W
08/12/2021  E1.75 INCH       CRAWFORD           PA   PUBLIC           

            DELAYED REPORT. APPROXIMATELY GOLF BALL-SIZE 
            HAIL PER PHOTO. TIME ESTIMATED VIA RADAR. 

0528 PM     TSTM WND DMG     2 N CONNEAUT LAKESHORE  41.66N 80.31W
08/12/2021                   CRAWFORD           PA   PUBLIC           

            DELAYED REPORT TREE DOWN ONTO A HOUSE ON 
            BRITTANY DR. 

0536 PM     TSTM WND DMG     2 NE BOARDMAN           41.05N 80.65W
08/12/2021                   MAHONING           OH   AMATEUR RADIO    

            PER SCANNER, TREE DOWN ON HOUSE ON EUCLID 
            BLVD. IN BOARDMAN. TIME ESTIMATED VIA RADAR. 

0540 PM     TSTM WND DMG     CONNEAUT LAKE           41.61N 80.30W
08/12/2021                   CRAWFORD           PA   EMERGENCY MNGR   

            TREE FELL ONTO A HOUSE SEVERELY DAMAGING THE 
            HOME NEAR SUMMIT TOWNSHIP IN WESTERN 
            CRAWFORD COUNTY. A MOBILE HOME WAS SEVERELY 
            DAMAGED. NUMEROUS TREES WERE BLOWN DOWN. 
            TIME WAS ESTIMATED BY RADAR. 

0731 PM     TSTM WND DMG     2 SW CONNEAUT LAKE      41.58N 80.33W
08/13/2021                   CRAWFORD           PA   911 CALL CENTER  

            TREE DOWN. TIME ESTIMATED FROM RADAR. 

0736 PM     TSTM WND DMG     1 ESE HUDSON            41.24N 81.44W
08/13/2021                   SUMMIT             OH   PUBLIC           

            GAS STATION CANOPY BLOWN OVER. TIME 
            ESTIMATED VIA RADAR. 

0757 PM     TSTM WND DMG     7 N TOWNVILLE           41.78N 79.86W
08/13/2021                   CRAWFORD           PA   911 CALL CENTER  

            TREE DOWN. TIME ESTIMATED FROM RADAR. 

0815 PM     FLOOD            2 NE PAINESVILLE        41.75N 81.22W
08/13/2021                   LAKE               OH   911 CALL CENTER  

            NUMEROUS STREETS FLOODED BY STANDING WATER. 

0821 PM     TSTM WND DMG     1 N MARSHALLVILLE       40.92N 81.73W
08/13/2021                   WAYNE              OH   911 CALL CENTER  

            TREE DOWN AND TELEPHONE POLE DOWN. 

0830 PM     FLOOD            1 NNW MENTOR            41.70N 81.34W
08/13/2021                   LAKE               OH   911 CALL CENTER  

            NUMEROUS STREETS FLOODED BY STANDING WATER. 

0900 PM     TSTM WND DMG     WARREN                  41.24N 80.81W
08/13/2021                   TRUMBULL           OH   911 CALL CENTER  

            NUMEROUS TREES DOWN ACROSS SOUTHERN HALF OF 
            THE COUNTY. 

0424 PM     MARINE TSTM WIND 1 NNW MARBLEHEAD        41.54N 82.73W
08/11/2021  M56 MPH          LEZ143             OH   OTHER FEDERAL    

            49 KNOT PEAK WIND. 

0332 AM     MARINE TSTM WIND 1 S MARBLEHEAD          41.51N 82.72W
08/11/2021  M51 MPH          LEZ144             OH   PUBLIC           

            *DELAYED REPORT* PERSONAL WEATHER STATION. 

0916 AM     MARINE TSTM WIND 2 NNE SANDUSKY          41.49N 82.70W
08/11/2021  M42 MPH          LEZ144             OH   MESONET          

            MESONET STATION XSDB 2 NNE SANDUSKY. 37 KNOT 
            PEAK WIND. 

0930 AM     MARINE TSTM WIND 1 ENE HURON             41.40N 82.54W
08/11/2021  M51 MPH          LEZ144             OH   OFFICIAL NWS OBS 

            44 KNOT PEAK WIND. 

0426 PM     MARINE TSTM WIND 2 NNE SANDUSKY          41.49N 82.70W
08/11/2021  M49 MPH          LEZ144             OH   MESONET          

            MESONET STATION XSDB 2 NNE SANDUSKY. 43 KNOT 
            PEAK WIND. 

0429 PM     MARINE TSTM WIND 1 S MARBLEHEAD          41.51N 82.72W
08/11/2021  M42 MPH          LEZ144             OH   PUBLIC           

            *DELAYED REPORT* PERSONAL WEATHER STATION. 

0601 PM     MARINE TSTM WIND 2 NNE SANDUSKY          41.49N 82.70W
08/13/2021  M40 MPH          LEZ144             OH   MESONET          

            MESONET STATION XSDB 2 NNE SANDUSKY. 35 KNOT 
            PEAK WIND. 

0640 PM     MARINE TSTM WIND 6 N AVONIA              42.13N 80.26W
08/11/2021  E42 MPH          LEZ149             PA   BUOY             

            37 KNOT PEAK WIND. 

1030 AM     TSTM WND GST     3 N ERIE                42.17N 80.10W
08/12/2021  M37 MPH          LEZ149             PA   MESONET          

            MESONET STATION EREP1 3 NNW ERIE. 

0300 AM     MARINE TSTM WIND 9 ENE OREGON            41.70N 83.26W
08/11/2021  M56 MPH          LEZ142             OH   C-MAN STATION    

            C-MAN STATION TWCO1 8 ENE OREGON. 

0350 PM     MARINE TSTM WIND 9 ENE OREGON            41.70N 83.26W
08/11/2021  M66 MPH          LEZ142             OH   MESONET          

            MESONET STATION TWCO1 8 ENE OREGON. 57 KNOT 
            PEAK WIND. 

0500 PM     MARINE TSTM WIND 9 ENE OREGON            41.70N 83.26W
08/13/2021  M40 MPH          LEZ142             OH   MESONET          

            MESONET STATION TWCO1 8 ENE OREGON. 35 KNOT 
            PEAK WIND. 

0524 PM     TSTM WND GST     20 N PORT CLINTON       41.80N 82.97W
08/13/2021  M65 MPH          LEZ163             OH   SHIP             

            TAKEN VIA ANEMOMETER ON THE MAST OF THE 
            SHIP. 

0933 AM     MARINE TSTM WIND 3 WNW VERMILION         41.43N 82.36W
08/11/2021  M47 MPH          LEZ145             OH   MESONET          

            MESONET STATION XVRM VERMILION. 41 KNOT PEAK 
            WIND. 

0618 PM     MARINE TSTM WIND 3 WNW VERMILION         41.43N 82.36W
08/13/2021  M39 MPH          LEZ145             OH   MESONET          

            MESONET STATION XVRM VERMILION. 34 KNOT PEAK 
            WIND. 

0630 PM     MARINE TSTM WIND 3 NNW LORAIN            41.48N 82.19W
08/13/2021  M39 MPH          LEZ145             OH   MESONET          

            MESONET STATION LORO1 2 NNW LORAIN. 34 KNOT 
            PEAK WIND. 

0510 PM     MARINE TSTM WIND 3 WNW CLEVELAND         41.50N 81.73W
08/11/2021  M58 MPH          LEZ146             OH   MESONET          

            MESONET STATION XCLE CLEVELAND - EDGEWATER. 
            50 KNOT PEAK WIND. 

0519 PM     MARINE TSTM WIND 3 WNW CLEVELAND         41.50N 81.73W
08/11/2021  M64 MPH          LEZ146             OH   MESONET          

            CORRECTS PREVIOUS NON-TSTM WND GST REPORT 
            FROM 3 WNW CLEVELAND. MESONET STATION XCLE 
            CLEVELAND - EDGEWATER. 56 KNOT PEAK WIND. 

0708 PM     MARINE TSTM WIND 3 WNW CLEVELAND         41.50N 81.73W
08/13/2021  M40 MPH          LEZ146             OH   MESONET          

            MESONET STATION XCLE CLEVELAND - EDGEWATER. 
            35 KNOT PEAK WIND. 

0430 AM     MARINE TSTM WIND 2 W GENEVA-ON-THE-LAKE  41.86N 80.97W
08/11/2021  M43 MPH          LEZ147             OH   C-MAN STATION    

            C-MAN STATION GELO1 1 W GENEVA-ON-THE-LAKE. 

0340 AM     MARINE TSTM WIND 19 NNW VERMILION        41.68N 82.40W
08/11/2021  M45 MPH          LEZ164             OH   BUOY             

            BUOY 45005 16 NW LORAIN. 

0450 PM     MARINE TSTM WIND 19 NNW VERMILION        41.68N 82.40W
08/11/2021  M54 MPH          LEZ164             OH   BUOY             

            47 KNOT PEAK WIND. 

0610 PM     MARINE TSTM WIND 19 NNW VERMILION        41.68N 82.40W
08/13/2021  E42 MPH          LEZ164             OH   BUOY             

            37 KNOT PEAK WIND. 


&&

$$

Environment

The upper air analysis revealed a general lack of flow aloft. Much of the convection was driven by existing surface outflow boundaries from nocturnal convection and/or enhanced pockets of low to mid-level flow.


Surface analysis on August 11, 2021 at 15Z (11 AM).	Surface analysis on August 12, 2021 at 21Z (5 PM).	Surface analysis on August 13, 2021 at 21Z (5 PM).

August 11, 2021


MUCAPE and effective shear on August 11, 2021 at 12Z (8 AM).	DCAPE on August 11, 2021 at 12z (8 AM). Note the increasing values of DCAPE east of the complex on radar, indicating that the complex was moving into a more favorable environment for strong winds.


MUCAPE and effective shear on August 11, 2021 at 20Z (4 PM).	DCAPE on August 11, 2021 at 20z (4 PM). Note the increasing values of DCAPE east of the complex on radar, indicating that the complex was moving into a more favorable environment for strong winds.

August 12, 2021


MUCAPE and effective shear on August 12, 2021 at 20Z (4 PM).	DCAPE on August 12, 2021 at 20z (4 PM). Note the increasing values of DCAPE towards the southeast portion of the area.

August 13, 2021


MUCAPE and effective shear on August 13, 2021 at 22Z (6 PM). Note that deep layer shear was a little stronger ahead of an advancing cold front.	DCAPE on August 13, 2021 at 22z (6 PM). Note the increasing values of DCAPE towards the southern portion of the area.