Alert archive / Ohio / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 42, NWS Wilmington, OH

June 18, 20214 counties in Ohio

NWS Wilmington, OH issued this severe thunderstorm warning at Jun 18, 2021, 11:03 PM EDT for 4 counties in Ohio. It was in force for 42 min. 1 report came from inside the area while it was in force.

The area

The outline as issued, with what was reported inside it.

The facts

Issued: Jun 18, 2021, 11:03 PM EDT (03:03 UTC)
Expired: Jun 18, 2021, 11:45 PM EDT
In force: 42 min
Issued by: NWS Wilmington, OH
Area: Storm-based polygon
Hail: 1.0 in
Wind: 50.0 mph

Counties Butler County, OH, Clermont County, OH, Hamilton County, OH, Warren County, OH

The radar

The Cincinnati radar (KILN), 50 km from the middle of the area, began a volume at 03:04 UTC, the scan nearest the moment this went out.

Open the radar archive at this moment

The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.

What was reported inside it

Time	Report	Where	Remark
Jun 18, 11:18 PM EDT	HAIL 1	West Chester, OH

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The watch it was issued in

The SPC watch in force over the same counties when this warning went out.

Issued	Product	Office	Lasted
Jun 18, 9:09 PM EDT	Severe Thunderstorm Watch	SPC	6 hr

The nearest sounding before it

Cncnati-Daytn, OH (KILN), launched 00:00Z, 3.1 hours before the alert went out and 52 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.

Skew-T log-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.

Mixed-layer CAPE: 2257 J/kg
Mixed-layer CIN: -56 J/kg
Mixed-layer LCL: 1236 m above ground
0-6 km bulk shear: 34 kt
0-1 km storm-relative helicity: 214 m²/s²
0-3 km storm-relative helicity: 240 m²/s²
Significant tornado parameter: 1.9
Supercell composite: 17.6

Open this sounding in Storm Lab

The text

As transmitted.

563 
WUUS51 KILN 190303
SVRILN
OHC017-025-061-165-190345-
/O.NEW.KILN.SV.W.0042.210619T0303Z-210619T0345Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Wilmington OH
1103 PM EDT Fri Jun 18 2021

The National Weather Service in Wilmington has issued a

* Severe Thunderstorm Warning for...
  Northeastern Hamilton County in southwestern Ohio...
  Southeastern Butler County in southwestern Ohio...
  Northwestern Clermont County in southwestern Ohio...
  Southern Warren County in southwestern Ohio...

* Until 1145 PM EDT.

* At 1102 PM EDT, a severe thunderstorm was located over Fairfield,
  moving east at 35 mph.

  HAZARD...Quarter size hail.

  SOURCE...Radar indicated.

  IMPACT...Minor damage to vehicles is possible.

* Locations impacted include...
  Hamilton, Fairfield, Mason, Lebanon, Forest Park, Sharonville,
  Monroe, Blue Ash, Loveland, Springdale, Reading, Montgomery,
  Madeira, Wyoming, Milford, Mount Healthy, Deer Park, Finneytown,
  West Chester and Terrace Park.

This includes the following Interstates...
 I-71 in Ohio between mile markers 11 and 35.
 I-75 in Ohio between mile markers 11 and 28.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

For your protection move to an interior room on the lowest floor of a
building.

To report severe weather, go to our website at weather.gov/iln and
submit your report via social media, when you can do so safely.

&&

LAT...LON 3927 8465 3944 8458 3942 8405 3921 8407
      3916 8431
TIME...MOT...LOC 0302Z 278DEG 30KT 3934 8451 

HAIL...1.00IN
WIND...<50MPH
 
$$

Hatzos

3 follow-up statements

424 
WWUS51 KILN 190314
SVSILN

Severe Weather Statement
National Weather Service Wilmington OH
1114 PM EDT Fri Jun 18 2021

OHC017-025-061-165-190345-
/O.CON.KILN.SV.W.0042.000000T0000Z-210619T0345Z/
Hamilton OH-Butler OH-Clermont OH-Warren OH-
1114 PM EDT Fri Jun 18 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 1145 PM EDT
FOR NORTHEASTERN HAMILTON...SOUTHEASTERN BUTLER...NORTHWESTERN
CLERMONT AND SOUTHERN WARREN COUNTIES...

At 1114 PM EDT, a severe thunderstorm was located over Olde West
Chester, moving east at 30 mph.

HAZARD...Half dollar size hail.

SOURCE...Radar indicated.

IMPACT...Minor damage to vehicles is possible.

Locations impacted include...
Hamilton, Fairfield, Mason, Lebanon, Forest Park, Sharonville,
Monroe, Blue Ash, Loveland, Springdale, Reading, Montgomery, Madeira,
Wyoming, Milford, Deer Park, West Chester, Terrace Park, Morrow and
Camp Dennison.

This includes the following Interstates...
 I-71 in Ohio between mile markers 12 and 35.
 I-75 in Ohio between mile markers 12 and 28.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

For your protection move to an interior room on the lowest floor of a
building.

To report severe weather, go to our website at weather.gov/iln and
submit your report via social media, when you can do so safely.

&&

LAT...LON 3925 8454 3944 8448 3942 8405 3921 8407
      3916 8431
TIME...MOT...LOC 0314Z 272DEG 28KT 3935 8440 

HAIL...1.25IN
WIND...<50MPH
 
$$

Hatzos

258 
WWUS51 KILN 190324
SVSILN

Severe Weather Statement
National Weather Service Wilmington OH
1124 PM EDT Fri Jun 18 2021

OHC061-190333-
/O.CAN.KILN.SV.W.0042.000000T0000Z-210619T0345Z/
Hamilton OH-
1124 PM EDT Fri Jun 18 2021

...THE SEVERE THUNDERSTORM WARNING FOR NORTHEASTERN HAMILTON COUNTY
IS CANCELLED...
    
The severe thunderstorm which prompted the warning has moved out of 
the warned area. Therefore, the warning has been cancelled.

A Severe Thunderstorm Watch remains in effect until 300 AM EDT for
southwestern Ohio.

LAT...LON 3943 8442 3942 8405 3921 8407 3925 8429
      3926 8428 3927 8426 3928 8426 3929 8427
      3931 8448
TIME...MOT...LOC 0323Z 274DEG 30KT 3935 8428 

$$

OHC017-025-165-190345-
/O.CON.KILN.SV.W.0042.000000T0000Z-210619T0345Z/
Butler OH-Clermont OH-Warren OH-
1124 PM EDT Fri Jun 18 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 1145 PM EDT
FOR SOUTHEASTERN BUTLER...NORTH CENTRAL CLERMONT AND SOUTHERN WARREN
COUNTIES...

At 1123 PM EDT, a severe thunderstorm was located over Kings Island,
moving east at 35 mph.

HAZARD...Half dollar size hail.

SOURCE...Radar indicated.

IMPACT...Minor damage to vehicles is possible.

Locations impacted include...
Mason, Lebanon, Sharonville, Monroe, Loveland, West Chester, Morrow,
Kings Island, Olde West Chester, Four Bridges, Wetherington, South
Lebanon, Maineville, Goshen, Butlerville, Pleasant Plain, Murdock,
Hughes and Fort Ancient.

This includes the following Interstates...
 I-71 in Ohio between mile markers 21 and 35.
 I-75 in Ohio between mile markers 18 and 28.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

For your protection move to an interior room on the lowest floor of a
building.

To report severe weather, go to our website at weather.gov/iln and
submit your report via social media, when you can do so safely.

&&

LAT...LON 3943 8442 3942 8405 3921 8407 3925 8429
      3926 8428 3927 8426 3928 8426 3929 8427
      3931 8448
TIME...MOT...LOC 0323Z 274DEG 30KT 3935 8428 

HAIL...1.25IN
WIND...<50MPH
 
$$

Hatzos

477 
WWUS51 KILN 190344
SVSILN

Severe Weather Statement
National Weather Service Wilmington OH
1144 PM EDT Fri Jun 18 2021

OHC017-025-165-190353-
/O.EXP.KILN.SV.W.0042.000000T0000Z-210619T0345Z/
Butler OH-Clermont OH-Warren OH-
1144 PM EDT Fri Jun 18 2021

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN BUTLER...NORTH
CENTRAL CLERMONT AND SOUTHERN WARREN COUNTIES WILL EXPIRE AT 1145 PM
EDT...
    
This warning has been replaced with a new severe thunderstorm 
warning, which is in effect for portions of Warren and Clermont 
counties until 1230 AM.

A Severe Thunderstorm Watch remains in effect until 300 AM EDT for
southwestern Ohio.

Please report previous wind damage or hail to the National Weather
Service by going to our website at weather.gov/iln and submitting
your report via social media.

LAT...LON 3943 8442 3942 8405 3921 8407 3925 8429
      3926 8428 3927 8426 3928 8426 3929 8427
      3931 8448
TIME...MOT...LOC 0343Z 278DEG 30KT 3933 8408 

$$

Hatzos

The office that day

Everything else NWS Wilmington, OH issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jun 18, 8:10 PM EDT	Severe Thunderstorm Warning	ILN	Butler, Hamilton	50 min
Jun 18, 8:11 PM EDT	Flash Flood Warning	ILN	Greene, Montgomery	3 hr
Jun 18, 8:11 PM EDT	Severe Thunderstorm Warning	ILN	Greene, Montgomery	34 min
Jun 18, 8:14 PM EDT	Severe Thunderstorm Warning	ILN	Montgomery, Preble	31 min
Jun 18, 8:18 PM EDT	Severe Thunderstorm Warning	ILN	Clinton, Greene, Warren	42 min
Jun 18, 8:33 PM EDT	Tornado Warning	ILN	Greene, Montgomery, Warren	27 min
Jun 18, 8:39 PM EDT	Severe Thunderstorm Warning	ILN	Butler, Hamilton, Montgomery, Preble, Warren	36 min
Jun 18, 8:46 PM EDT	Tornado Warning Tornado observed	ILN	Butler, Montgomery, Warren	29 min
Jun 18, 8:51 PM EDT	Severe Thunderstorm Warning	ILN	Clinton, Fayette, Highland	39 min
Jun 18, 9:09 PM EDT	Severe Thunderstorm Warning	ILN	Adams, Brown, Clinton, Highland	51 min
Jun 18, 9:11 PM EDT	Tornado Warning	ILN	Hamilton	34 min
Jun 18, 9:15 PM EDT	Severe Thunderstorm Warning	ILN	Brown, Butler, Clermont, Clinton, Hamilton, Warren	45 min
Jun 18, 9:16 PM EDT	Flash Flood Warning	ILN	Clinton, Greene, Warren	3 hr
Jun 18, 9:26 PM EDT	Flash Flood Warning	ILN	Butler, Montgomery, Warren	3 hr
Jun 18, 9:32 PM EDT	Flash Flood Warning	ILN	Clinton, Highland, Pike	3 hr
Jun 18, 9:39 PM EDT	Areal Flood Advisory	ILN	Hamilton	3 hr
Jun 18, 9:49 PM EDT	Severe Thunderstorm Warning	ILN	Adams, Brown, Clermont, Pike, Scioto	56 min
Jun 18, 10:34 PM EDT	Severe Thunderstorm Warning	ILN	Adams, Scioto	41 min
Jun 18, 10:58 PM EDT	Special Weather Statement	ILN	Butler, Warren	32 min
Jun 18, 11:15 PM EDT	Areal Flood Warning	ILN	Greene, Montgomery	6 hr
Jun 18, 11:21 PM EDT	River Flood Warning	ILN	Greene, Warren	20 hr
Jun 18, 11:43 PM EDT	Severe Thunderstorm Warning	ILN	Brown, Clermont, Clinton, Highland, Warren	19 min
Jun 19, 12:01 AM EDT	Severe Thunderstorm Warning	ILN	Darke	27 min
Jun 19, 12:12 AM EDT	Areal Flood Advisory	ILN	Warren	3 hr
Jun 19, 12:19 AM EDT	Special Weather Statement	ILN	Miami	26 min
Jun 19, 12:23 AM EDT	Special Weather Statement	ILN	Preble	37 min
Jun 19, 12:33 AM EDT	Areal Flood Warning	ILN	Clinton, Greene, Warren	6 hr
Jun 19, 1:12 AM EDT	Areal Flood Advisory	ILN	Darke, Preble	2 hr
Jun 19, 1:55 AM EDT	Special Weather Statement	ILN	Montgomery	35 min
Jun 19, 2:33 AM EDT	Areal Flood Advisory	ILN	Butler, Clinton, Darke, Greene, Montgomery, Preble and 1 more	3 hr
Jun 19, 3:04 AM EDT	Flash Flood Warning	ILN	Clinton, Warren	2 hr
Jun 19, 3:28 AM EDT	Areal Flood Advisory	ILN	Brown, Clinton, Highland	3 hr
Jun 19, 6:39 AM EDT	Areal Flood Advisory	ILN	Hamilton	19 min
Jun 19, 6:54 AM EDT	Flash Flood Warning	ILN	Hamilton	13 hr
Jun 19, 8:12 AM EDT	River Flood Warning	ILN	Hamilton	4 hr
Jun 19, 8:16 AM EDT	Areal Flood Advisory	ILN	Butler, Hamilton	5 hr
Jun 19, 8:46 AM EDT	Special Weather Statement	ILN	Clermont	44 min
Jun 19, 9:08 AM EDT	Areal Flood Advisory	ILN	Brown, Clermont, Highland	3 hr
Jun 19, 9:28 AM EDT	River Flood Warning	ILN	Warren	10 hr
Jun 19, 9:29 AM EDT	River Flood Warning	ILN	Clermont, Hamilton	24 hr
Jun 19, 1:18 PM EDT	River Flood Advisory	ILN	Hamilton	9 hr

Nearby

Severe Thunderstorm Warnings in Ohio, 2021 Every severe thunderstorm warning in 2021

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.