Alert archive / Ohio / Tornado Warnings in 2011

Tornado Warning 13, NWS Wilmington, OH

April 20, 2011Brown County, Clermont County, Hamilton County, Ohio; Boone County, Campbell County, Kenton County, Kentucky

NWS Wilmington, OH issued this tornado warning at Apr 20, 2011, 1:24 AM EDT for Brown County, Clermont County, Hamilton County, Ohio; Boone County, Campbell County, Kenton County, Kentucky. It was in force for 36 min. 2 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: Apr 20, 2011, 1:24 AM EDT (05:24 UTC)
Expired: Apr 20, 2011, 2:00 AM EDT
In force: 36 min
Issued by: NWS Wilmington, OH
Area: Storm-based polygon

Counties Boone County, KY, Campbell County, KY, Kenton County, KY, Brown County, OH, Clermont County, OH, Hamilton County, OH

The radar

The Cincinnati radar (KILN), 78 km from the middle of the area, began a volume at 05:24 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
Apr 20, 1:32 AM EDT	TSTM WND GST 60	Florence, KY	ESTIMATED 60 MPH GUST FROM AMATEUR RADIO
Apr 20, 1:54 AM EDT	TSTM WND DMG	6 Sw Crestview Hills, KY	SEMI TRUCKS BLOWN OVER

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
Apr 19, 10:13 PM EDT	Tornado Watch	SPC	6 hr

The nearest sounding before it

Cncnati-Daytn, OH (KILN), launched 00:00Z, 5.4 hours before the alert went out and 80 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: 1686 J/kg
Mixed-layer CIN: -39 J/kg
Mixed-layer LCL: 1003 m above ground
0-6 km bulk shear: 51 kt
0-1 km storm-relative helicity: 387 m²/s²
0-3 km storm-relative helicity: 474 m²/s²
Significant tornado parameter: 4.3
Supercell composite: 18.7

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

603 
WFUS51 KILN 200524
TORILN
KYC015-037-117-OHC015-025-061-200600-
/O.NEW.KILN.TO.W.0013.110420T0524Z-110420T0600Z/

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE WILMINGTON OH
124 AM EDT WED APR 20 2011

THE NATIONAL WEATHER SERVICE IN WILMINGTON HAS ISSUED A

* TORNADO WARNING FOR...
  BOONE COUNTY IN NORTHERN KENTUCKY...
  CAMPBELL COUNTY IN NORTHERN KENTUCKY...
  KENTON COUNTY IN NORTHERN KENTUCKY...
  WESTERN BROWN COUNTY IN SOUTHWEST OHIO...
  CENTRAL CLERMONT COUNTY IN SOUTHWEST OHIO...
  SOUTHEASTERN HAMILTON COUNTY IN SOUTHWEST OHIO...

* UNTIL 200 AM EDT.

* AT 122 AM EDT...RADAR INDICATED A SEVERE THUNDERSTORM CAPABLE OF
  PRODUCING A TORNADO. THIS DANGEROUS STORM WAS LOCATED NEAR
  RICEDALE......MOVING EAST AT 50 MPH. IN ADDITION TO THE TORNADO...
  THIS STORM IS CAPABLE OF PRODUCING DESTRUCTIVE STRAIGHT LINE WINDS.

* LOCATIONS IMPACTED INCLUDE...
  FORT WRIGHT...
  COVINGTON...
  TAYLOR MILL...
  WILDER...
  SOUTHGATE...
  HIGHLAND HEIGHTS...
  COLD SPRING...
  CLARYVILLE...
  ALEXANDRIA...
  SILVER GROVE...
  MELBOURNE...
  ANDERSON TOWNSHIP...

IN ADDITION...WHITE TOWER...LATONIA LAKES...KENTON VALE...MORNING
VIEW...WHITE VILLA...FAIRVIEW...RYLAND HEIGHTS AND VISALIA ARE NEAR
THE PATH OF THIS DANGEROUS THUNDERSTORM.

THIS INCLUDES THE FOLLOWING INTERSTATE...
I-75 BETWEEN MILE MARKERS 167 AND 189 IN KENTUCKY...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

TAKE COVER NOW. MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR OF A
STURDY BUILDING. AVOID WINDOWS. IF IN A MOBILE HOME...A VEHICLE OR
OUTDOORS...MOVE TO THE CLOSEST SUBSTANTIAL SHELTER AND PROTECT
YOURSELF FROM FLYING DEBRIS.

PLEASE REPORT TORNADOES...FUNNEL CLOUDS...STRONG WINDS OR HAIL TO THE
NATIONAL WEATHER SERVICE BY CALLING TOLL FREE...877-633-6772...WHEN
YOU CAN DO SO SAFELY.

A TORNADO WATCH REMAINS IN EFFECT UNTIL 500 AM EDT WEDNESDAY MORNING
FOR SOUTHEASTERN INDIANA AND NORTHEASTERN KENTUCKY AND SOUTHWESTERN
OHIO.

&&

LAT...LON 3881 8463 3902 8469 3916 8398 3894 8392
      3879 8457 3879 8460
TIME...MOT...LOC 0524Z 258DEG 44KT 3896 8454

$$

1 follow-up statement

424 
WWUS51 KILN 200549
SVSILN

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE WILMINGTON OH
149 AM EDT WED APR 20 2011

KYC015-117-OHC061-200558-
/O.CAN.KILN.TO.W.0013.000000T0000Z-110420T0600Z/
KENTON KY-BOONE KY-HAMILTON OH-
149 AM EDT WED APR 20 2011

...THE TORNADO WARNING FOR SOUTHEASTERN HAMILTON...BOONE AND KENTON
COUNTIES HAS BEEN CANCELLED...

PLEASE REPORT PREVIOUS TORNADOES...WIND DAMAGE OR HAIL TO THE
NATIONAL WEATHER SERVICE BY CALLING TOLL FREE...877-633-6772.

LAT...LON 3885 8431 3890 8431 3903 8433 3903 8432
      3907 8432 3910 8430 3916 8398 3894 8392
TIME...MOT...LOC 0548Z 258DEG 44KT 3902 8417

$$

KYC037-OHC015-025-200600-
/O.CON.KILN.TO.W.0013.000000T0000Z-110420T0600Z/
CAMPBELL KY-BROWN OH-CLERMONT OH-
149 AM EDT WED APR 20 2011

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 200 AM EDT FOR CENTRAL
CLERMONT...WESTERN BROWN AND CAMPBELL COUNTIES...

AT 145 AM EDT...RADAR CONTINUED TO INDICATE A SEVERE THUNDERSTORM
CAPABLE OF PRODUCING A TORNADO. THIS DANGEROUS STORM WAS LOCATED NEAR
AMELIA...MOVING EAST AT 50 MPH. IN ADDITION TO THE TORNADO...THIS
STORM IS CAPABLE OF PRODUCING DESTRUCTIVE STRAIGHT LINE WINDS.

LOCATIONS IMPACTED INCLUDE...
BETHEL AND WILLIAMSBURG.

IN ADDITION...BANTAM...EAST FORK STATE PARK...OWENSVILLE AND LOCUST
RIDGE ARE NEAR THE PATH OF THIS STORM.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

TAKE COVER NOW. MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR OF A
STURDY BUILDING. AVOID WINDOWS. IF IN A MOBILE HOME...A VEHICLE OR
OUTDOORS...MOVE TO THE CLOSEST SUBSTANTIAL SHELTER. PROTECT YOURSELF
FROM FLYING DEBRIS.

PLEASE REPORT TORNADOES...FUNNEL CLOUDS...STRONG WINDS OR HAIL TO THE
NATIONAL WEATHER SERVICE BY CALLING TOLL FREE...877-633-6772...WHEN
YOU CAN DO SO SAFELY.

&&

LAT...LON 3885 8431 3890 8431 3903 8433 3903 8432
      3907 8432 3910 8430 3916 8398 3894 8392
TIME...MOT...LOC 0548Z 258DEG 44KT 3902 8417

$$

AN

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 19, 10:53 PM EDT	Severe Thunderstorm Warning	ILN	Auglaize, Darke, Mercer, Preble, Shelby	67 min
Apr 19, 11:42 PM EDT	Flash Flood Warning	ILN	Clark, Darke, Greene, Miami, Montgomery, Preble	6 hr
Apr 19, 11:49 PM EDT	Severe Thunderstorm Warning	ILN	Auglaize, Champaign, Clark, Darke, Hardin, Logan and 4 more	41 min
Apr 19, 11:53 PM EDT	Tornado Warning	ILN	Auglaize, Mercer	37 min
Apr 19, 11:54 PM EDT	Areal Flood Advisory	ILN	Auglaize, Champaign, Clark, Darke, Hardin, Logan and 4 more	6 hr
Apr 19, 11:56 PM EDT	Severe Thunderstorm Warning	ILN	Darke, Miami, Montgomery, Preble	49 min
Apr 20, 12:10 AM EDT	Tornado Warning	ILN	Auglaize, Hardin	35 min
Apr 20, 12:26 AM EDT	Severe Thunderstorm Warning	ILN	Champaign, Clark, Hardin, Logan, Miami, Shelby and 1 more	49 min
Apr 20, 12:34 AM EDT	Severe Thunderstorm Warning	ILN	Butler, Clermont, Hamilton, Warren	41 min
Apr 20, 12:39 AM EDT	Severe Thunderstorm Warning	ILN	Darke, Preble	51 min
Apr 20, 12:46 AM EDT	Severe Thunderstorm Warning	ILN	Clark, Darke, Greene, Miami, Montgomery, Preble	44 min
Apr 20, 12:47 AM EDT	Tornado Warning	ILN	Butler	28 min
Apr 20, 12:52 AM EDT	Tornado Warning	ILN	Hamilton	23 min
Apr 20, 1:04 AM EDT	Flash Flood Warning	ILN	Butler, Hamilton	6 hr
Apr 20, 1:09 AM EDT	Tornado Warning	ILN	Butler, Hamilton, Warren	36 min
Apr 20, 1:11 AM EDT	Tornado Warning	ILN	Clermont, Hamilton	34 min
Apr 20, 1:17 AM EDT	Severe Thunderstorm Warning	ILN	Butler, Champaign, Clark, Greene, Miami, Montgomery and 2 more	43 min
Apr 20, 1:37 AM EDT	Tornado Warning	ILN	Brown, Clermont, Hamilton	38 min
Apr 20, 1:40 AM EDT	Severe Thunderstorm Warning	ILN	Butler, Clermont, Clinton, Greene, Hamilton, Highland and 2 more	50 min
Apr 20, 1:43 AM EDT	Severe Thunderstorm Warning	ILN	Champaign, Clark, Delaware, Fayette, Franklin, Greene and 5 more	47 min
Apr 20, 1:49 AM EDT	Severe Thunderstorm Warning	ILN	Adams, Brown, Clermont, Clinton, Highland	41 min
Apr 20, 1:55 AM EDT	Severe Thunderstorm Warning	ILN	Clinton, Fayette, Franklin, Greene, Highland, Madison and 2 more	50 min
Apr 20, 1:56 AM EDT	Severe Thunderstorm Warning	ILN	Adams, Brown, Clermont	49 min
Apr 20, 2:00 AM EDT	Tornado Warning	ILN	Brown, Highland	30 min
Apr 20, 2:02 AM EDT	Tornado Warning	ILN	Brown, Clermont	28 min
Apr 20, 2:06 AM EDT	Severe Thunderstorm Warning	ILN	Delaware, Fairfield, Franklin, Licking, Madison, Pickaway and 1 more	39 min
Apr 20, 2:07 AM EDT	Areal Flood Advisory	ILN	Clinton, Highland, Warren	6 hr
Apr 20, 2:19 AM EDT	Severe Thunderstorm Warning	ILN	Adams, Fayette, Highland, Pike, Ross, Scioto	41 min
Apr 20, 2:23 AM EDT	Tornado Warning	ILN	Adams, Highland, Pike	37 min
Apr 20, 2:27 AM EDT	Severe Thunderstorm Warning	ILN	Adams	18 min
Apr 20, 2:28 AM EDT	Areal Flood Advisory	ILN	Delaware, Fayette, Franklin, Madison, Pickaway, Union	6 hr
Apr 20, 2:34 AM EDT	Severe Thunderstorm Warning	ILN	Adams, Scioto	41 min
Apr 20, 2:34 AM EDT	Tornado Warning	ILN	Fairfield, Licking	26 min
Apr 20, 2:38 AM EDT	Tornado Warning	ILN	Delaware, Franklin, Licking	23 min
Apr 20, 2:43 AM EDT	Severe Thunderstorm Warning	ILN	Fairfield, Hocking, Pickaway, Ross	47 min
Apr 20, 2:51 AM EDT	Severe Thunderstorm Warning	ILN	Pike, Ross, Scioto	39 min
Apr 20, 3:12 AM EDT	Severe Thunderstorm Warning	ILN	Scioto	20 min
Apr 20, 3:26 AM EDT	Severe Thunderstorm Warning	ILN	Hocking	26 min
Apr 20, 5:46 AM EDT	Areal Flood Advisory	ILN	Clark, Darke, Greene, Miami, Montgomery, Preble and 1 more	3 hr
Apr 20, 6:55 AM EDT	Areal Flood Advisory	ILN	Butler, Hamilton	3 hr
Apr 20, 9:24 AM EDT	River Flood Warning	ILN	Butler, Montgomery, Warren	5 hr
Apr 20, 9:24 AM EDT	River Flood Warning	ILN	Butler	5 hr
Apr 20, 12:08 PM EDT	River Flood Warning	ILN	Clermont, Hamilton, Warren	7 hr
Apr 20, 2:24 PM EDT	River Flood Warning	ILN	Adams	3 hr
Apr 20, 3:46 PM EDT	River Flood Advisory	ILN	Hamilton	11 hr
Apr 20, 12:37 AM EDT	Severe Thunderstorm Warning	ILN	Boone, Campbell, Carroll, Gallatin, Grant, Kenton and 2 more	38 min
Apr 20, 12:56 AM EDT	Tornado Warning	ILN	Boone, Campbell, Gallatin, Grant, Kenton, Pendleton	34 min
Apr 20, 1:10 AM EDT	Tornado Warning	ILN	Bracken, Campbell, Carroll, Gallatin, Grant, Kenton and 3 more	35 min
Apr 20, 1:41 AM EDT	Tornado Warning	ILN	Bracken, Grant, Pendleton, Robertson	34 min

Nearby

Tornado Warnings in Ohio, 2011 Tornado Warnings in Kentucky, 2011 Every tornado warning in 2011 Tornadoes in 2011

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.