An upper level shortwave helped support an mesoscale convective system as it crossed ohio. This system weakened as it reached eastern Ohio but not before some wind damage was reported.
Every event with a place to put it. Tap one for its entry below.
Deaths and injuries are direct and indirect together, as the offices filed them. Damage is property and crops in the dollars of the year, not adjusted for inflation, and only where an office estimated it.
The episode as NWS PBZ wrote it up.
An upper level shortwave helped support an mesoscale convective system as it crossed ohio. This system weakened as it reached eastern Ohio but not before some wind damage was reported. Thunderstorms out ahead of the system also caused flash flooding to areas of western Pennsylvania.
The local office's own words before the first event, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.
NWS Pittsburgh, PA wrote its last area forecast discussion before the first event at Jun 18, 4:04 PM EST, 58 minutes earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE PITTSBURGH PA 504 PM EDT MON JUN 18 2012 .SYNOPSIS... AN UPPER LEVEL SHORTWAVE WILL SUPPORT SCATTERED SHOWERS AND THUNDERSTORMS THIS EVENING. HOT AND HUMID WEATHER WILL FOLLOW FOR TUESDAY AND WEDNESDAY AS HIGH PRESSURE BUILDS OVER THE OHIO VALLEY. && .NEAR TERM /THROUGH TUESDAY/... UPDATE ISSUED MAINLY TO PRECIP PROBABILITIES TO ACCOUNT FOR WEAKENING MCS APPROACH ON EAST CENTRAL OHIO COUNTIES AS WELL AS SCATTERED THUNDERSTORM DEVELOPMENT ALONG WEAK RESIDUAL BOUNDARY LYING ROUGHLY ALONG I 70. NOT LOOKING AT A WIDESPREAD SEVERE THREAT THIS EVENING GIVEN THE LACK OF DEEP LAYER SHEAR OVER THE REGION AND WARM MID LEVEL TEMPERATURES...HOWEVER SOME WARNINGS MAY BE POSSIBLE DUE TO MOMENTUM OF THE PROPAGATING MCS AS WELL AS CELL COLLISIONS IN THE WARM/MOIST ATMOSPHERE OVER THE UPR OH REGION. A STRONG UPPER LEVEL RIDGE WILL BEGIN TO BUILD OVERHEAD TONIGHT AND THE THUNDERSTORM THREAT WILL RAPIDLY DIMINISH AS THE EVE PROGRESSES. && .SHORT TERM /TUESDAY NIGHT THROUGH THURSDAY NIGHT/... BENIGN WEATHER OVERALL WITH POTENTIAL FOR THE FIRST HEAT WAVE OF 2012. H5 HEIGHTS BUILD AS A LARGE MID LEVEL ANTICYCLONE CONTROLS THE WEATHER FOR MUCH OF THE ERN CONUS TUE - THUR. H8 TEMPS PUSH 20-21C...WHICH USING THE ENERGY BLOCK METHOD YIELDS 90F-95F FOR MAXT ACROSS THE LOWLANDS...WITH LOWER TO MID 80S IN THE HIGHER ELEVATIONS. DAYTIME HEAT INDEX VALUES WILL BE IN THE MID 90S. HEAT STRESS INDEXES FOR NEARBY URBAN CITIES ARE NEARLY MAXED OUT...SO EVEN THOUGH TEMPERATURES WILL NOT REACH ADVISORY LEVELS...GIVEN ITS EARLY JUNE VERSUS LATE JULY OR AUGUST...IMPACTS ARE PROBABLE. WILL INSERT VERBIAGE INTO THE HWO TO RAISE AWARENESS...AND AS TIME DRAWS CLOSER...SPECIAL WEATHER STATEMENTS MAY BY NEEDED. WE HAVE POSTED HEAT SAFETY TIPS ON OUR WEBSITE UNDER THE TOP NEWS OF THE DAY. THE MAIN CHALLENGE IN THE SHORT TERM IS THE AREAL EXTENT OF ISOLATED TO SCATTERED THUNDERSTORMS IN THE MOUNTAINS THURSDAY. GFS CONTINUES TO BE THE ONLY MODEL FROM THE NCEP SUITE THAT DEVELOPS A LEE TROUGH...CONSEQUENTLY LLVL CONVERGENCE AND EQUIVALENT POTENTIAL TEMPERATURES INCREASE SPURRING AFTERNOON CONVECTION IN THE MODEL. AT THIS TIME...PLAYED SCHC POPS AS BUFR SOUNDINGS DO NOT ILLUSTRATE A CAP...SO REGARDLESS IF THE LEE TROUGH FORMS...HIT OR MISS STORMS COULD OCCUR OVER WRN MD AND NRN WV. && .LONG TERM /FRIDAY THROUGH MONDAY/... OVERALL GOOD AGREEMENT AMONGST LONG RANGE MODELS FOR THE EXTENDED. A WEAK BAROCLINIC ZONE WILL TRAVERSE THE AREA FRIDAY...HOWEVER WITH LIMITED UPPER SUPPORT...NOT MUCH RAINFALL IS ANTICIPATED. AT THIS TIME...ANY STORMS THAT FIRE ALONG AND AHEAD OF THE FRONT WILL REMAIN BELOW SEVERE LEVELS. HIGH PRESSURE BUILDS IN FOR THE FIRST PART OF THE WEEKEND AND GIVEN A NW TRAJECTORY ALOFT...LOOK FOR TEMPERATURES TO BE BELOW NORMAL FOR AFTERNOON HIGHS. THE AFOREMENTIONED NW FLOW ALOFT YIELDS ANOTHER WEATHER SYSTEM SUN NGT INTO MONDAY. STRONGER HEIGHT FALLS AT MID LEVEL SHOULD RESULT IN MORE PCPN WITH THIS FRONT THAN ITS PREDECESSOR FRI. CONTINUE TO CARRY CHC POPS WITH THIS FEATURE...AS TIMING ISSUES AT DAY 6 CREATE LOWER CONFIDENCE IN PCPN PROBABILITY. H5 ANTICYCLONE CRANKS BUILDS OVER THE CENTRAL CONUS...THUS PERSISTING WITH NW WINDS ALOFT. AT THIS TIME...DO NOT SEE SIGNALS OF AN TSTM COMPLEXES / MCS PARADE ON THE DOWNSTREAM SIDE OF THE RIDGE...BUT THIS WILL BE MONITORED OVER DURING THE WEEK. BIAS CORRECTED GRIDS FROM MOSGUIDE WHERE USED FOR TEMPERATURES WITH MINOR TWEAKS. && .AVIATION /21Z MONDAY THROUGH SATURDAY/... SHOWERS AND THUNDERSTORMS HAVE FINALLY BEGUN TO DEVELOP...BUT MENTION HAS BEEN LIMITED DUE TO SCT COVERAGE. CONDITIONS SHOULD GENERALLY REMAIN VFR EXCEPT IN ANY THUNDERSTORMS THROUGH THE EVENING. WINDS WILL REMAIN 10KTS OR LESS WITH THE EXCEPTION OF GUSTS WITH ANY STRONGER STORMS. WITH LOW LEVEL MOISTURE PRESENT...ESPECIALLY AT ANY LOCATIONS THAT RECEIVE RAINFALL TODAY...SOME FOG COULD DEVELOP. ALL GUIDANCE SUGGESTS THIS AS WELL BUT FOR NOW MAINTAINED MVFR VISIBILITY RESTRICTIONS. .OUTLOOK...TUESDAY THROUGH FRIDAY... HIGH PRESSURE RIDGE WILL BUILD OVER THE EASTERN US AND PROVIDE VFR TUESDAY THROUGH EARLY THURSDAY. A COLD FRONT IS PROGGED TO BRING RAIN AND THE POTENTIAL FOR RESTRICTIONS LATE THURSDAY AND THURSDAY NIGHT. HIGH PRESSURE WILL RETURN VFR CONDITIONS IN THE WAKE OF THE FRONT ON FRIDAY. && .PBZ WATCHES/WARNINGS/ADVISORIES... MD...NONE. OH...NONE. PA...NONE. WV...NONE. && 15
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE PITTSBURGH PA 424 PM EDT MON JUN 18 2012 OHZ059-068-069-PAZ007>009-013>016-020>023-029-031-073-075-WVZ001>004- 012-021-022-192030- BELMONT-NOBLE-MONROE-MERCER-VENANGO-FOREST-LAWRENCE-BUTLER-CLARION- JEFFERSON PA-BEAVER-ALLEGHENY-ARMSTRONG-INDIANA-WASHINGTON-GREENE- WESTMORELAND-FAYETTE-HANCOCK-BROOKE-OHIO-MARSHALL-WETZEL-MARION- MONONGALIA- 424 PM EDT MON JUN 18 2012 THIS HAZARDOUS WEATHER OUTLOOK IS FOR EAST CENTRAL OHIO...NORTHWEST PENNSYLVANIA...SOUTHWEST PENNSYLVANIA...WEST CENTRAL PENNSYLVANIA...NORTHERN WEST VIRGINIA AND NORTHERN PANHANDLE OF WEST VIRGINIA. .DAY ONE...TONIGHT. THERE IS A CHANCE OF THUNDERSTORMS THIS EVENING. SOME ISOLATED STORMS COULD APPROACH SEVERE LIMITS WITH DAMAGING WIND GUSTS AS THE PRIMARY THREAT. .DAYS TWO THROUGH SEVEN...TUESDAY THROUGH SUNDAY. AFTERNOON TEMPERATURES WILL BE IN THE LOWER TO MID 90S WITH HEAT INDEX VALUES CLIMBING INTO THE MID 90S FOR MOST AREAS. .SPOTTER INFORMATION STATEMENT... WEATHER SPOTTERS ARE ENCOURAGED TO REPORT SIGNIFICANT WEATHER CONDITIONS ACCORDING TO STANDARD OPERATING PROCEDURES. MDZ001-PAZ074-076-WVZ023-041-192030- GARRETT-WESTMORELAND RIDGES-FAYETTE RIDGES-PRESTON-TUCKER- 424 PM EDT MON JUN 18 2012 THIS HAZARDOUS WEATHER OUTLOOK IS FOR WESTERN MARYLAND...SOUTHWEST PENNSYLVANIA AND NORTHERN WEST VIRGINIA. .DAY ONE...TONIGHT. THERE IS A CHANCE OF THUNDERSTORMS THIS EVENING. SOME ISOLATED STORMS COULD APPROACH SEVERE LIMITS WITH DAMAGING WIND GUSTS AS THE PRIMARY THREAT. .DAYS TWO THROUGH SEVEN...TUESDAY THROUGH SUNDAY. NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME. .SPOTTER INFORMATION STATEMENT... WEATHER SPOTTERS ARE ENCOURAGED TO REPORT SIGNIFICANT WEATHER CONDITIONS ACCORDING TO STANDARD OPERATING PROCEDURES. OHZ039>041-048>050-057-058-192030- TUSCARAWAS-CARROLL-COLUMBIANA-COSHOCTON-HARRISON-JEFFERSON OH- MUSKINGUM-GUERNSEY- 424 PM EDT MON JUN 18 2012 THIS HAZARDOUS WEATHER OUTLOOK IS FOR EAST CENTRAL OHIO. .DAY ONE...TONIGHT. THERE IS A SLIGHT CHANCE OF SEVERE THUNDERSTORMS THIS EVENING. DAMAGING WIND GUSTS ARE THE PRIMARY THREAT. .DAYS TWO THROUGH SEVEN...TUESDAY THROUGH SUNDAY. AFTERNOON TEMPERATURES WILL BE IN THE LOWER TO MID 90S WITH HEAT INDEX VALUES CLIMBING INTO THE MID 90S FOR MOST AREAS. .SPOTTER INFORMATION STATEMENT... WEATHER SPOTTERS ARE ENCOURAGED TO REPORT SIGNIFICANT WEATHER CONDITIONS ACCORDING TO STANDARD OPERATING PROCEDURES. 15
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE PITTSBURGH PA
502 PM EDT MON JUN 18 2012
PAZ029-182200-
WASHINGTON PA-
502 PM EDT MON JUN 18 2012
...SLOW MOVING THUNDERSTORMS OVER WASHINGTON COUNTY...
AT 457 PM EDT NATIONAL WEATHER SERVICE DOPPLER RADAR IN PITTSBURGH
INDICATED A NEARLY STATIONARY, STRONG THUNDERSTORM JUST SOUTH OF
CLAYSVILLE.
PLEASE REPORT HAIL...STRONG WINDS OR WIND DAMAGE TO THE NATIONAL
WEATHER SERVICE BY CALLING TOLL FREE...1-877-633-6772.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
HEAVY RAINS MAY FLOOD LOW LYING AREAS SUCH AS DITCHES AND
UNDERPASSES. AVOID THESE AREAS AND DO NOT CROSS FLOODED ROADS AS THEY
MAY BE WASHED OUT. WATER LEVELS OF SMALL STREAMS AND CREEKS MAY ALSO
RISE...THEREFORE SEEK HIGHER GROUND IF THREATENED BY FLOOD WATERS.
&&
LAT...LON 4013 8047 4014 8024 4001 8021 4000 8028
4001 8027 4002 8030 4000 8031 3999 8040SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE PITTSBURGH PA 507 PM EDT MON JUN 18 2012 PAZ021-073-182145- ALLEGHENY PA-WESTMORELAND PA- 507 PM EDT MON JUN 18 2012 ...A STRONG THUNDERSTORM WILL AFFECT CENTRAL WESTMORELAND AND SOUTHEASTERN ALLEGHENY COUNTIES... AT 501 PM EDT...A STRONG THUNDERSTORM WAS LOCATED 4 MILES EAST OF MCKEESPORT...MOVING EAST AT 20 MPH. HEAVY RAIN WILL POND WATER ON ROADS AND QUICKLY FILL DITCHES AND SMALL STREAMS. WIND GUSTS TO 50 MPH AND SMALL HAIL ARE POSSIBLE WITH THIS STORM. SOME LOCATIONS THAT WILL BE IMPACTED INCLUDE... TURTLE CREEK... IRWIN... JEANNETTE... DELMONT... GREENSBURG... THIS WILL IMPACT THE FOLLOWING HIGHWAYS... TOLL 66 BETWEEN MILE MARKERS 4 AND 13. I-76 BETWEEN MILE MARKERS 59 AND 70. PLEASE REPORT SIGNIFICANT WEATHER TO THE NATIONAL WEATHER SERVICE BY CALLING TOLL FREE...877-633-6772. LAT...LON 4046 7949 4027 7946 4026 7983 4040 7985 15
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE PITTSBURGH PA
522 PM EDT MON JUN 18 2012
OHZ039>041-048-182145-
CARROLL OH-COLUMBIANA OH-COSHOCTON OH-TUSCARAWAS OH-
522 PM EDT MON JUN 18 2012
...THUNDERSTORMS WILL AFFECT CARROLL...NORTHERN COSHOCTON...NORTHERN
TUSCARAWAS AND NORTHWESTERN COLUMBIANA COUNTIES...
AT 516 PM EDT...THUNDERSTORMS WERE ALONG A LINE FROM 9 MILES EAST OF
AKRON TO 5 MILES NORTHWEST OF STRASBURG TO 19 MILES NORTHWEST OF
WALHONDING...MOVING SOUTHEAST AT 20 MPH.
THESE STORMS WILL GENERATE HEAVY RAIN THAT WILL POND WATER ON ROADS
AND QUICKLY FILL DITCHES AND SMALL STREAMS. WIND GUSTS OF 40 TO 50
MPH AND SMALL HAIL ARE ALSO POSSIBLE WITH THESE STORMS. SOME
STRENGTHENING TO SEVERE LEVELS IS POSSIBLE WITH ISOLATED CELLS.
SOME LOCATIONS THAT WILL BE IMPACTED INCLUDE...
BOLIVAR... STRASBURG... WALHONDING...
SUGARCREEK... SHERRODSVILLE... SALEM...
NEW PHILADELPHIA... MINERAL CITY... MALVERN...
LEESVILLE LAKE PARK... LAYLAND...
HOMEWORTH...
THIS WILL IMPACT THE FOLLOWING HIGHWAY...
I-77 IN OHIO BETWEEN MILE MARKERS 74 AND 95.
PLEASE REPORT SIGNIFICANT WEATHER TO THE NATIONAL WEATHER SERVICE BY
CALLING TOLL FREE...877-633-6772.
LAT...LON 4046 8218 4045 8168 4064 8167 4067 8146
4066 8125 4073 8123 4074 8109 4091 8108
4091 8091 4093 8090 4093 8083 4046 8109
4033 8211 4038 8220
15PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE PITTSBURGH PA
547 PM EDT MON JUN 18 2012
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0545 PM FLASH FLOOD CLAYSVILLE 39.94N 81.67W
06/18/2012 GUERNSEY OH EMERGENCY MNGR
SEVERAL SMALL... UNAMED CREEKS OUT OF BANKS. CHAPEL
HILL ROAD FLOODED.
&&
EVENT NUMBER PBZ1200509
XXPRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE PITTSBURGH PA
549 PM EDT MON JUN 18 2012
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0545 PM TSTM WND DMG CLAYSVILLE 39.94N 81.67W
06/18/2012 GUERNSEY OH EMERGENCY MNGR
TREES DOWN.
&&
EVENT NUMBER PBZ1200510
XXPRELIMINARY LOCAL STORM REPORT...CORRECTED
NATIONAL WEATHER SERVICE PITTSBURGH PA
550 PM EDT MON JUN 18 2012
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0545 PM FLASH FLOOD CLAYSVILLE 40.12N 80.41W
06/18/2012 WASHINGTON PA EMERGENCY MNGR
SEVERAL SMALL... UNAMED CREEKS OUT OF BANKS. CHAPEL
HILL ROAD FLOODED.
&&
CORRECTED COUNTY/STATE...LOCATION
EVENT NUMBER PBZ1200509
XXThe Cleveland radar (KCLE), 94 km away, was scanning. The volume nearest the first event began at 22:02 UTC.
4 thunderstorm wind. Local standard time, as filed.
Local law enforcement reported a tree down on State Route 93.
Local law enforcement reported trees down on route 146, County Road 10, and Country Road 271 in Coshocton.
Local law enforcement reported a tree down on Schilling Hill Road between Dover and Sugarcreek.
County official reported a tree down on I-77 near mile marker 74.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Ohio in 2012Every state in 2012This day in weather historyWarnings in Ohio, June 2012
NOAA National Centers for Environmental Information, Storm Events Database, compiled from the National Weather Service’s monthly Storm Data. Complete through 2026-06; NCEI adds each month about 75 days after it ends and revises past years a few times a year. Rebuilt 2026-09-24. Each event’s entry at NCEI: 391062, 391063, 391064, 391065.