A narrow axis of showers with embedded thunderstorms developed along a cold front as it pushed east through the region during the morning hours.
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 ILN wrote it up.
A narrow axis of showers with embedded thunderstorms developed along a cold front as it pushed east through the region during the morning hours.
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 Wilmington, OH wrote its last area forecast discussion before the first event at May 1, 6:41 AM EST, 52 minutes earlier.
Area Forecast Discussion National Weather Service Wilmington OH 741 AM EDT Mon May 1 2017 .SYNOPSIS... A cold front will move east of the area today. Cooler and drier air will filter in behind the front on Tuesday. Low pressure developing to the southwest will bring showers back into the forecast starting Wednesday and continuing through Thursday. && .NEAR TERM /UNTIL 6 PM THIS EVENING/... Low pressure moving from Iowa to the Western Great Lakes will drag a cold front through the ILN area today. The cold front, currently located over Indiana, will be east of the area by early this afternoon according to latest model forecasts. Showers and thunderstorms developing in the southerly flow ahead of the cold front will continue to affect the area until the front moves east. Went with categorical PoPs this morning, with rain chances tapering off quickly this afternoon as the system progresses out of the area. Thunderstorms have been sub severe, and may remain so due to marginal instability limiting updraft heights and downdraft potential. Wind gusts over 30 mph will be evident in the tight pressure gradient surrounding the front. Temperatures starting out mild will cool off into the 50s behind the front before rebounding a bit during the afternoon, with highs in the 60s expected in most locations. && .SHORT TERM /6 PM THIS EVENING THROUGH 6 PM TUESDAY/... Low pressure at the surface and aloft will be lifting through the Great Lakes tonight to Southeast Canada on Tuesday. This will place the ILN area in a strong cyclonic flow that will gradually weaken toward Tuesday evening. A few showers may affect mainly northern locations tonight, with shower chances diminished Tuesday as the system moves farther northeast. Strong winds will persist, with gusts close to 40 mph likely Tuesday afternoon during peak mixing. High temperatures will vary from the upper 50s north under thicker clouds and sharper cold advection, up to the upper 60s south where clouds should be less prevalent. && .LONG TERM /TUESDAY NIGHT THROUGH SUNDAY/... Upper level low to pull away into southeast Canada leaving a westerly flow in its wake. Surface high pressure will nose into the region in the mid level confluent flow Tuesday night into early Wednesday. This high will provide a temporary dry period. Upper level flow backs allowing an increase in moisture as a trof develops in the nations mid section. Will spread rain showers back in from the south Wednesday afternoon. Temperatures look to be close to 10 degrees below normal with highs Wednesday ranging from the upper 50s northwest to the mid 60s southeast. The upper low migrates east into the Ohio Valley and closes off by Friday. Associated surface low tracks across KY and deepens Thursday. This will enhance rain shower chances, so will highlight categorical pops Wednesday night into Thursday. Clouds and rain will keep temperatures cool with highs Thursday ranging from the mid 50s northwest to the lower 60s southeast. Closed upper low to pass over the area Friday which will keep the threat of showers in the forecast. Cool highs from the upper 50s to around 60 are expected Friday. As the upper low pulls away an embedded shortwave will bring a continued threat of showers Saturday. Temperatures are expected to be around 5 degrees below normal with highs Saturday between 60 and 65. Surface high pressure to nose in next Sunday providing dry weather. Temperatures look to moderate slightly with highs Sunday in the lower and middle 60s. && .AVIATION /12Z MONDAY THROUGH FRIDAY/... TAF sites continue to be affected by complex low pressure centered over Iowa. As the low travels to the Western Great Lakes, it is pushing a strong cold front across the Ohio Valley region. Showers and thunderstorms that have developed ahead of the front are now impacting TAF sites, with MVFR conditions and wind gusts over 30 knots expected during the next several hours. The front will be east of all TAF sites by about 16z. A shift in wind direction to southwest will occur by this afternoon bringing drier air and VFR behind the cold front and showers. Winds will continue to gust around 30 knots this afternoon until subsiding a bit this evening. MVFR ceilings may develop again after 00z Tuesday in a cyclonic flow behind the cold front. OUTLOOK...Wind gusts to 35 kt possible on Tuesday. MVFR ceilings and visibilities possible Thursday through Friday. && .ILN WATCHES/WARNINGS/ADVISORIES... OH...None. KY...None. IN...None. && SYNOPSIS...Coniglio NEAR TERM...Coniglio SHORT TERM...Coniglio LONG TERM...AR AVIATION...Coniglio
Hazardous Weather Outlook National Weather Service Wilmington OH 431 AM EDT Mon May 1 2017 INZ050-058-059-066-073>075-080-KYZ089>100-OHZ026-034-035-042>046- 051>056-060>065-070>074-077>082-088-020845- Wayne-Fayette IN-Union IN-Franklin IN-Ripley-Dearborn-Ohio- Switzerland-Carroll-Gallatin-Boone-Kenton-Campbell-Owen-Grant- Pendleton-Bracken-Robertson-Mason-Lewis-Hardin-Mercer-Auglaize-Darke- Shelby-Logan-Union OH-Delaware-Miami-Champaign-Clark-Madison- Franklin OH-Licking-Preble-Montgomery-Greene-Fayette OH-Pickaway- Fairfield-Butler-Warren-Clinton-Ross-Hocking-Hamilton-Clermont-Brown- Highland-Adams-Pike-Scioto- 431 AM EDT Mon May 1 2017 This Hazardous Weather Outlook is for East Central Indiana, Southeast Indiana, Northeast Kentucky, Northern Kentucky, Central Ohio, Southwest Ohio and West Central Ohio. .DAY ONE...Today and Tonight. Wind gusts up to 40 MPH are possible today. .DAYS TWO THROUGH SEVEN...Tuesday through Sunday. Wind gusts up to 40 MPH will be possible on Tuesday. .SPOTTER INFORMATION STATEMENT... Spotter activation is not expected at this time.
Special Weather Statement
National Weather Service Wilmington OH
553 AM EDT MON MAY 1 2017
INZ074-KYZ090>093-095-OHZ070-071-077-078-011100-
Dearborn IN-Boone KY-Kenton KY-Campbell KY-Gallatin KY-Grant KY-
Hamilton OH-Clermont OH-Warren OH-Butler OH-
553 AM EDT MON MAY 1 2017
...A LINE OF STRONG THUNDERSTORMS WILL AFFECT NORTHEASTERN
DEARBORN...KENTON...CAMPBELL...BOONE...NORTHWESTERN GRANT...EASTERN
GALLATIN...HAMILTON...SOUTHEASTERN BUTLER...NORTHWESTERN CLERMONT AND
WESTERN WARREN COUNTIES UNTIL 700 AM EDT...
At 553 AM EDT, radar indicated strong thunderstorms along a line
extending from Bright to near Burlington to near Patriot, moving
northeast at 40 mph.
STORM HAZARDS INCLUDE...
Winds to 40 mph...
Very heavy rain...
Locations impacted include...
Cincinnati, Hamilton, Middletown, Fairfield, Covington, Mason,
Florence, Independence, Lebanon, Norwood, Forest Park, Erlanger,
Springboro, Fort Thomas, Newport, Sharonville, Monroe, Blue Ash,
Loveland and Trenton.
This includes the following Interstates...
I-71 in Kentucky between mile markers 65 and 77.
I-71 in Ohio between mile markers 0 and 33.
I-74 in Ohio between mile markers 0 and 19.
I-75 in Kentucky between mile markers 166 and 191.
I-75 in Ohio between mile markers 0 and 41.
Water will pond on roads and may quickly fill roadside ditches and
small streams.
To report hazardous weather conditions, go to our website at
weather.gov/iln and submit your report via social media, when you can
do so safely.
LAT...LON 3872 8478 3885 8480 3888 8478 3889 8481
3899 8483 3922 8493 3959 8424 3958 8418
3927 8411 3899 8408
TIME...MOT...LOC 0953Z 214DEG 44KT 3921 8486 3904 8479 3879 8477
ARSpecial Weather Statement
National Weather Service Wilmington OH
644 AM EDT MON MAY 1 2017
KYZ092-093-OHZ043-044-051>053-061-062-070>072-077>080-011145-
Campbell KY-Kenton KY-Highland OH-Montgomery OH-Warren OH-Butler OH-
Clark OH-Greene OH-Hamilton OH-Clermont OH-Champaign OH-Brown OH-
Logan OH-Clinton OH-Shelby OH-Miami OH-
644 AM EDT MON MAY 1 2017
...A LINE OF STRONG THUNDERSTORMS WILL AFFECT SOUTHERN KENTON...
CAMPBELL...SOUTHEASTERN SHELBY...WESTERN CHAMPAIGN...EASTERN
BUTLER...CLERMONT...WESTERN LOGAN...WESTERN CLARK...EASTERN
HAMILTON...NORTHWESTERN BROWN...WARREN...WESTERN CLINTON...GREENE...
WEST CENTRAL HIGHLAND...MONTGOMERY AND MIAMI COUNTIES UNTIL 745 AM
EDT...
At 644 AM EDT, radar indicated strong thunderstorms along a line
extending from near West Milton to near Trenton to near Claryville,
moving northeast at 45 mph.
STORM HAZARDS INCLUDE...
Winds to 40 mph...
Very heavy rain...
Locations impacted include...
Cincinnati, Dayton, Springfield, Kettering, Middletown, Beavercreek,
Fairfield, Huber Heights, Fairborn, Mason, Xenia, Troy, Independence,
Trotwood, Piqua, Miamisburg, Lebanon, Norwood, Springboro and Fort
Thomas.
This includes the following Interstates...
I-70 in Ohio between mile markers 24 and 55.
I-71 in Ohio between mile markers 5 and 52.
I-75 in Ohio between mile markers 9 and 84.
Water will pond on roads and may quickly fill roadside ditches and
small streams.
To report hazardous weather conditions, go to our website at
weather.gov/iln and submit your report via social media, when you can
do so safely.
LAT...LON 4050 8367 3983 8381 3909 8381 3880 8448
3940 8449 4012 8433
TIME...MOT...LOC 1044Z 229DEG 38KT 3999 8431 3944 8444 3890 8445
ARSpecial Weather Statement
National Weather Service Wilmington OH
728 AM EDT MON MAY 1 2017
KYZ097>100-OHZ063-071-072-078>081-011230-
Robertson KY-Mason KY-Lewis KY-Bracken KY-Clermont OH-Highland OH-
Adams OH-Brown OH-Warren OH-Fayette OH-Clinton OH-
728 AM EDT MON MAY 1 2017
...A LINE OF STRONG THUNDERSTORMS WILL AFFECT MASON...ROBERTSON...
NORTHWESTERN LEWIS...BRACKEN...EASTERN CLERMONT...BROWN...
SOUTHEASTERN WARREN...SOUTH CENTRAL FAYETTE...WESTERN ADAMS...CLINTON
AND HIGHLAND COUNTIES UNTIL 830 AM EDT...
At 728 AM EDT, radar indicated strong thunderstorms along a line
extending from 6 miles southwest of Blanchester to 10 miles northeast
of Cynthiana, moving northeast at 40 mph.
STORM HAZARDS INCLUDE...
Winds to 50 mph...
Very heavy rain...
Locations impacted include...
Wilmington, Maysville, Hillsboro, Georgetown, Blanchester,
Washington, Mount Orab, West Union, Bethel, Williamsburg, Manchester,
Ripley, Aberdeen, Lynchburg, Leesburg, New Vienna, Augusta, Morrow,
Winchester and Sardinia.
This includes I-71 in Ohio between mile markers 35 and 41.
Water will pond on roads and may quickly fill roadside ditches and
small streams.
To report hazardous weather conditions, go to our website at
weather.gov/iln and submit your report via social media, when you can
do so safely.
LAT...LON 3843 8400 3846 8410 3848 8413 3848 8417
3850 8416 3850 8418 3856 8416 3855 8421
3859 8420 3860 8421 3946 8412 3944 8348
3843 8356 3843 8358 3849 8359 3852 8364
3846 8386 3849 8393 3842 8400
TIME...MOT...LOC 1128Z 234DEG 36KT 3923 8407 3849 8416Special Weather Statement
National Weather Service Wilmington OH
733 AM EDT MON MAY 1 2017
OHZ026-035-043>045-051>054-062-063-071-072-011230-
Warren OH-Hardin OH-Clark OH-Greene OH-Champaign OH-Auglaize OH-
Logan OH-Fayette OH-Madison OH-Clinton OH-Shelby OH-Union OH-
Miami OH-
733 AM EDT MON MAY 1 2017
...A LINE OF STRONG THUNDERSTORMS WILL AFFECT EASTERN SHELBY...
CHAMPAIGN AND LOGAN COUNTIES IN WEST CENTRAL OHIO...WESTERN FAYETTE
COUNTY IN CENTRAL OHIO...CLARK AND NORTHEASTERN AUGLAIZE COUNTIES IN
WEST CENTRAL OHIO...NORTHEASTERN WARREN AND NORTHERN CLINTON COUNTIES
IN SOUTHWESTERN OHIO...GREENE AND HARDIN COUNTIES IN WEST CENTRAL
OHIO...CENTRAL MADISON...WESTERN UNION COUNTIES IN CENTRAL OHIO AND
EASTERN MIAMI COUNTIES IN WEST CENTRAL OHIO UNTIL 830 AM EDT...
At 732 AM EDT, radar indicated strong thunderstorms along a line
extending from near Fort Shawnee to near Waynesville, moving
northeast at 40 mph.
STORM HAZARDS INCLUDE...
Winds to 50 mph...
Very heavy rain...
Locations impacted include...
Springfield, Beavercreek, Huber Heights, Fairborn, Xenia, Marysville,
Washington Court House, Bellefontaine, Wilmington, Urbana, London,
Kenton, Bellbrook, Ada, New Carlisle, Yellow Springs,
Wright-Patterson Afb, Northridge, Cedarville and Waynesville.
This includes the following Interstates...
I-70 in Ohio between mile markers 41 and 79.
I-71 in Ohio between mile markers 42 and 79.
Water will pond on roads and may quickly fill roadside ditches and
small streams.
To report hazardous weather conditions, go to our website at
weather.gov/iln and submit your report via social media, when you can
do so safely.
LAT...LON 4082 8350 4070 8350 4069 8342 4051 8342
4051 8334 3944 8340 3946 8407 4064 8406
4065 8388 4082 8388
TIME...MOT...LOC 1132Z 238DEG 35KT 4067 8403 3950 8402Special Weather Statement
National Weather Service Wilmington OH
819 AM EDT MON MAY 1 2017
KYZ099-100-OHZ063-072-073-079>082-011315-
Mason KY-Lewis KY-Pike OH-Highland OH-Adams OH-Brown OH-Ross OH-
Fayette OH-Clinton OH-
819 AM EDT MON MAY 1 2017
...A LINE OF STRONG THUNDERSTORMS WILL AFFECT MASON...LEWIS...
SOUTHEASTERN BROWN...SOUTHEASTERN FAYETTE...ADAMS...SOUTHEASTERN
CLINTON...WESTERN PIKE...HIGHLAND AND SOUTHWESTERN ROSS COUNTIES
UNTIL 915 AM EDT...
At 818 AM EDT, radar indicated strong thunderstorms along a line
extending from near New Vienna to near Cowan, moving northeast at 45
mph.
STORM HAZARDS INCLUDE...
Winds to 50 mph...
Very heavy rain...
Locations impacted include...
Maysville, Hillsboro, Greenfield, Washington, West Union, Manchester,
Peebles, Ripley, Aberdeen, Vanceburg, Leesburg, New Vienna,
Winchester, Marshall, Sardinia, Seaman, Bainbridge, Lewisburg,
Belfast and Rome.
Water will pond on roads and may quickly fill roadside ditches and
small streams.
To report hazardous weather conditions, go to our website at
weather.gov/iln and submit your report via social media, when you can
do so safely.
LAT...LON 3841 8351 3841 8353 3843 8358 3849 8359
3851 8361 3851 8363 3852 8363 3852 8364
3846 8386 3849 8392 3944 8372 3944 8317
3900 8323 3901 8327 3879 8327 3842 8332
3840 8347
TIME...MOT...LOC 1218Z 229DEG 40KT 3941 8369 3844 8389Special Weather Statement
National Weather Service Wilmington OH
824 AM EDT MON MAY 1 2017
OHZ026-044>046-052>055-063-064-072-073-011330-
Champaign OH-Ross OH-Delaware OH-Logan OH-Fayette OH-Madison OH-
Clinton OH-Hardin OH-Franklin OH-Pickaway OH-Union OH-Clark OH-
824 AM EDT MON MAY 1 2017
...A LINE OF STRONG THUNDERSTORMS WILL AFFECT SOUTHEASTERN CHAMPAIGN
COUNTY IN WEST CENTRAL OHIO...FRANKLIN COUNTY IN CENTRAL OHIO...
EASTERN LOGAN COUNTY IN WEST CENTRAL OHIO...FAYETTE COUNTY IN CENTRAL
OHIO...NORTHEASTERN CLINTON COUNTY IN SOUTHWESTERN OHIO...WESTERN
PICKAWAY AND DELAWARE COUNTIES IN CENTRAL OHIO...SOUTHEASTERN CLARK
AND EASTERN HARDIN COUNTIES IN WEST CENTRAL OHIO...MADISON...UNION
COUNTIES IN CENTRAL OHIO AND NORTHWESTERN ROSS COUNTIES IN
SOUTHWESTERN OHIO UNTIL 930 AM EDT...
At 823 AM EDT, radar indicated strong thunderstorms along a line
extending from near Forest to near Sabina, moving northeast at 50
mph.
STORM HAZARDS INCLUDE...
Winds to 50 mph...
Very heavy rain...
Locations impacted include...
Columbus, Dublin, Westerville, Grove City, Delaware, Upper Arlington,
Hilliard, Marysville, Washington Court House, Worthington, Bexley,
London, Kenton, Jefferson, Powell, Sunbury, Plain City, West
Jefferson, Ashville and Sabina.
This includes the following Interstates...
I-70 in Ohio between mile markers 70 and 104.
I-71 in Ohio between mile markers 64 and 139.
Water will pond on roads and may quickly fill roadside ditches and
small streams.
To report hazardous weather conditions, go to our website at
weather.gov/iln and submit your report via social media, when you can
do so safely.
LAT...LON 4070 8350 4070 8344 4069 8344 4069 8342
4050 8342 4051 8326 4044 8325 4043 8302
4042 8301 4041 8293 4036 8293 4035 8285
3944 8304 3944 8368 3995 8356 4082 8363
4082 8351
TIME...MOT...LOC 1223Z 228DEG 42KT 4083 8347 3948 8354The Cincinnati radar (KILN), 34 km away, was scanning. The volume nearest the first event began at 12:34 UTC.
3 thunderstorm wind. Local standard time, as filed.
Several houses along Miller Lane sustained some minor roof and siding damage. Several trees were also downed.
A few trees were downed.
A large tree was downed along Big Pete Road.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Ohio in 2017Every state in 2017This day in weather historyWarnings in Ohio, May 2017
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: 683975, 683976, 683977.