Alert archive / Ohio / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 95, NWS Wilmington, OH

August 12, 2021Champaign County, Clark County, Madison County, Ohio

NWS Wilmington, OH issued this severe thunderstorm warning at Aug 12, 2021, 4:03 PM EDT for Champaign County, Clark County, Madison County, Ohio. It was in force for 42 min. 3 reports 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: Aug 12, 2021, 4:03 PM EDT (20:03 UTC)
Expired: Aug 12, 2021, 4:45 PM EDT
In force: 42 min
Issued by: NWS Wilmington, OH
Area: Storm-based polygon
Hail: 0.75 in
Wind: 60.0 mph

Counties Champaign County, OH, Clark County, OH, Madison County, OH

The radar

The Cincinnati radar (KILN), 61 km from the middle of the area, began a volume at 20:02 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
Aug 12, 4:09 PM EDT	TSTM WND DMG	3 E Springfield, OH	TREES DOWN IN HOLIDAY HILLS. TIME ESTIMATED FROM RADAR.
Aug 12, 4:13 PM EDT	HAIL 1	5 Nw London, OH
Aug 12, 4:19 PM EDT	TSTM WND DMG	2 Sse Springfield, OH	TREES DOWN AT CLARK STATE. TIME ESTIMATED FROM RADAR.

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

The nearest sounding before it

Cncnati-Daytn, OH (KILN), launched 12:00Z, 8.1 hours before the alert went out and 59 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: 1817 J/kg
Mixed-layer CIN: -77 J/kg
Mixed-layer LCL: 946 m above ground
0-6 km bulk shear: 18 kt
0-1 km storm-relative helicity: 71 m²/s²
0-3 km storm-relative helicity: 96 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

547 
WUUS51 KILN 122003
SVRILN
OHC021-023-097-122045-
/O.NEW.KILN.SV.W.0095.210812T2003Z-210812T2045Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Wilmington OH
403 PM EDT Thu Aug 12 2021

The National Weather Service in Wilmington has issued a

* Severe Thunderstorm Warning for...
  Southeastern Champaign County in west central Ohio...
  Northeastern Clark County in west central Ohio...
  Central Madison County in central Ohio...

* Until 445 PM EDT.

* At 403 PM EDT, a severe thunderstorm was located near Springfield,
  moving east at 25 mph.

  HAZARD...60 mph wind gusts and penny size hail.

  SOURCE...Radar indicated.

  IMPACT...Expect damage to trees and power lines.

* Locations impacted include...
  Springfield, London, Choctaw Lake, Harmony, Brighton, Lafayette,
  South Vienna, Catawba, Buck Creek State Park, State Route 29 at
  State Route 38, Interstate 70 at State Route 56, New Moorefield and
  Plattsburg.

This includes I-70 in Ohio between mile markers 56 and 78.
 
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 3989 8379 4000 8382 4005 8348 3998 8339
      3984 8340
TIME...MOT...LOC 2003Z 253DEG 23KT 3995 8370 

HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...0.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH

$$

Hatzos

4 follow-up statements

400 
WWUS51 KILN 122017
SVSILN

Severe Weather Statement
National Weather Service Wilmington OH
417 PM EDT Thu Aug 12 2021

OHC021-023-097-122045-
/O.CON.KILN.SV.W.0095.000000T0000Z-210812T2045Z/
Champaign OH-Clark OH-Madison OH-
417 PM EDT Thu Aug 12 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 445 PM EDT
FOR SOUTHEASTERN CHAMPAIGN...NORTHEASTERN CLARK AND CENTRAL MADISON
COUNTIES...

At 417 PM EDT, a severe thunderstorm was located 7 miles east of
Springfield, moving east at 15 mph.

HAZARD...60 mph wind gusts and penny size hail.

SOURCE...Radar indicated.

IMPACT...Expect damage to trees and power lines.

Locations impacted include...
Springfield, London, Choctaw Lake, Harmony, Brighton, Lafayette, 
South Vienna, Catawba, Buck Creek State Park, New Moorefield and 
Plattsburg.

This includes I-70 in Ohio between mile markers 56 and 78.
 
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 3989 8379 3996 8381 4002 8371 4005 8348
      3998 8339 3984 8340
TIME...MOT...LOC 2017Z 259DEG 15KT 3993 8366 

HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...0.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH

$$

Hatzos

132 
WWUS51 KILN 122022
SVSILN

Severe Weather Statement
National Weather Service Wilmington OH
422 PM EDT Thu Aug 12 2021

OHC021-023-097-122045-
/O.CON.KILN.SV.W.0095.000000T0000Z-210812T2045Z/
Champaign OH-Clark OH-Madison OH-
422 PM EDT Thu Aug 12 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 445 PM EDT
FOR SOUTHEASTERN CHAMPAIGN...NORTHEASTERN CLARK AND CENTRAL MADISON
COUNTIES...

At 421 PM EDT, a severe thunderstorm was located 7 miles west of
Choctaw Lake, moving east at 20 mph.

HAZARD...60 mph wind gusts and quarter size hail.

SOURCE...Radar indicated and public reported. One-inch hail was 
         reported in eastern Clark County at about 415 PM.

IMPACT...Minor hail damage to vehicles is possible. Expect wind 
         damage to trees and power lines.

Locations impacted include...
Springfield, London, Choctaw Lake, Harmony, Brighton, Lafayette, 
South Vienna, Catawba, Buck Creek State Park, Plattsburg and Catawba 
Station.

This includes I-70 in Ohio between mile markers 56 and 78.
 
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 3989 8379 3993 8380 4003 8365 4005 8348
      3998 8339 3984 8340
TIME...MOT...LOC 2021Z 257DEG 18KT 3994 8362 

HAIL THREAT...OBSERVED
MAX HAIL SIZE...1.00 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH

$$

Hatzos

383 
WWUS51 KILN 122029
SVSILN

Severe Weather Statement
National Weather Service Wilmington OH
429 PM EDT Thu Aug 12 2021

OHC021-122038-
/O.CAN.KILN.SV.W.0095.000000T0000Z-210812T2045Z/
Champaign OH-
429 PM EDT Thu Aug 12 2021

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

LAT...LON 4002 8344 3998 8339 3984 8340 3989 8379
      3993 8380 4000 8366
TIME...MOT...LOC 2028Z 254DEG 13KT 3992 8365 

$$

OHC023-097-122045-
/O.CON.KILN.SV.W.0095.000000T0000Z-210812T2045Z/
Clark OH-Madison OH-
429 PM EDT Thu Aug 12 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 445 PM EDT
FOR NORTHEASTERN CLARK AND CENTRAL MADISON COUNTIES...

At 428 PM EDT, a severe thunderstorm was located near South
Charleston, moving east at 15 mph.

HAZARD...60 mph wind gusts and quarter size hail.

SOURCE...Radar indicated.

IMPACT...Minor hail damage to vehicles is possible. Expect wind 
         damage to trees and power lines.

Locations impacted include...
Springfield, London, Choctaw Lake, Harmony, Brighton, Lafayette,
South Vienna, Catawba, Buck Creek State Park, and Plattsburg.

This includes I-70 in Ohio between mile markers 56 and 78.
 
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 4002 8344 3998 8339 3984 8340 3989 8379
      3993 8380 4000 8366
TIME...MOT...LOC 2028Z 254DEG 13KT 3992 8365 

HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.00 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH

$$

Hatzos

503 
WWUS51 KILN 122042
SVSILN

Severe Weather Statement
National Weather Service Wilmington OH
442 PM EDT Thu Aug 12 2021

OHC023-097-122052-
/O.EXP.KILN.SV.W.0095.000000T0000Z-210812T2045Z/
Clark OH-Madison OH-
442 PM EDT Thu Aug 12 2021

...THE SEVERE THUNDERSTORM WARNING FOR NORTHEASTERN CLARK AND CENTRAL
MADISON COUNTIES WILL EXPIRE AT 445 PM EDT...
    
An additional severe thunderstorm warning is now in effect for Clark 
and Madison counties until 530 PM.

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 4002 8344 3998 8339 3984 8340 3989 8379
      3993 8380 4000 8366
TIME...MOT...LOC 2042Z 253DEG 23KT 3994 8355 

$$

Hatzos

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 12, 3:49 PM EDT	Special Weather Statement	ILN	Clark	26 min
Aug 12, 4:41 PM EDT	Severe Thunderstorm Warning	ILN	Clark, Madison	49 min
Aug 12, 5:13 PM EDT	Special Weather Statement	ILN	Madison	32 min
Aug 12, 5:28 PM EDT	Severe Thunderstorm Warning	ILN	Franklin, Madison, Pickaway	47 min
Aug 12, 5:29 PM EDT	Special Weather Statement	ILN	Clark	31 min
Aug 12, 5:58 PM EDT	Special Weather Statement	ILN	Madison	32 min
Aug 12, 5:59 PM EDT	Special Weather Statement	ILN	Darke	31 min
Aug 12, 6:03 PM EDT	Special Weather Statement	ILN	Licking	27 min
Aug 12, 6:14 PM EDT	Special Weather Statement	ILN	Madison	31 min
Aug 12, 6:29 PM EDT	Special Weather Statement	ILN	Licking	31 min
Aug 12, 6:29 PM EDT	Special Weather Statement	ILN	Darke	31 min
Aug 12, 6:50 PM EDT	Special Weather Statement	ILN	Champaign	25 min
Aug 12, 6:54 PM EDT	Special Weather Statement	ILN	Licking	36 min
Aug 12, 6:56 PM EDT	Special Weather Statement	ILN	Miami	34 min
Aug 12, 6:57 PM EDT	Special Weather Statement	ILN	Madison	33 min
Aug 12, 7:09 PM EDT	Special Weather Statement	ILN	Darke	36 min
Aug 12, 7:18 PM EDT	Areal Flood Advisory	ILN	Clark, Franklin, Madison	2 hr
Aug 12, 7:24 PM EDT	Special Weather Statement	ILN	Champaign	36 min
Aug 12, 7:26 PM EDT	Special Weather Statement	ILN	Madison	34 min
Aug 12, 7:37 PM EDT	Special Weather Statement	ILN	Miami	23 min
Aug 12, 7:44 PM EDT	Severe Thunderstorm Warning	ILN	Miami	31 min
Aug 12, 7:50 PM EDT	Flash Flood Warning	ILN	Clark, Madison	3 hr
Aug 12, 7:55 PM EDT	Special Weather Statement	ILN	Franklin	35 min
Aug 12, 7:57 PM EDT	Special Weather Statement	ILN	Union	33 min

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.