Alert archive / Ohio / Tornado Watches in 2008

Tornado Watch 12

January 8, 20087 counties in Indiana; 21 counties in Kentucky; 30 counties in Ohio

The Storm Prediction Center issued this tornado watch at Jan 8, 2008, 10:07 PM EST for 7 counties in Indiana; 21 counties in Kentucky; 30 counties in Ohio. It was in force for 4 hr.

The area

The outline as issued.

The facts

Issued
Jan 8, 2008, 10:07 PM EST (03:07 UTC)
Expired
Jan 9, 2008, 1:47 AM EST
In force
4 hr
Issued by
the Storm Prediction Center
Largest hail expected
1 in
Strongest gust expected
60 kt
All 58 counties

Dearborn County, IN, Franklin County, IN, Jefferson County, IN, Ohio County, IN, Ripley County, IN, Switzerland County, IN, Union County, IN, Boone County, KY, Bourbon County, KY, Bracken County, KY, Campbell County, KY, Carroll County, KY, Franklin County, KY, Gallatin County, KY, Grant County, KY, Harrison County, KY, Henry County, KY, Kenton County, KY, Lewis County, KY, Mason County, KY, Nicholas County, KY, Oldham County, KY, Owen County, KY, Pendleton County, KY, Robertson County, KY, Scott County, KY, Shelby County, KY, Trimble County, KY, Adams County, OH, Auglaize County, OH, Brown County, OH, Butler County, OH, Champaign County, OH, Clark County, OH, Clermont County, OH, Clinton County, OH, Delaware County, OH, Fairfield County, OH, Fayette County, OH, Franklin County, OH, Greene County, OH, Hamilton County, OH, Hardin County, OH, Highland County, OH, Hocking County, OH, Licking County, OH, Logan County, OH, Madison County, OH, Miami County, OH, Montgomery County, OH, Pickaway County, OH, Pike County, OH, Preble County, OH, Ross County, OH, Scioto County, OH, Shelby County, OH, Union County, OH, Warren County, OH

The radar

The Cincinnati radar (KILN), 41 km from the middle of the area, began a volume at 03:07 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 SPC expected

The probabilities SPC published with the watch, for the watch area over its life.

Two or more tornadoes
30%
One or more EF2 to EF5 tornadoes
10%
Ten or more severe wind reports
40%
One or more gusts of 65 knots or more
20%
Ten or more severe hail reports
30%
One or more hailstones of 2 inches or more
5%
Six or more combined severe hail and wind reports
70%

Warnings issued inside it

12 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.

IssuedProductOfficeCountiesLasted
Jan 8, 10:31 PM ESTSevere Thunderstorm WarningILNMontgomery, Preble44 min
Jan 8, 10:48 PM ESTSevere Thunderstorm WarningILNMiami, Montgomery42 min
Jan 8, 11:03 PM ESTSevere Thunderstorm WarningILNButler, Montgomery, Warren42 min
Jan 8, 11:23 PM ESTSevere Thunderstorm WarningILNClark, Greene, Montgomery, Warren52 min
Jan 8, 11:29 PM ESTSevere Thunderstorm WarningILNChampaign, Clark46 min
Jan 8, 11:45 PM ESTSevere Thunderstorm WarningILNClinton, Warren32 min
Jan 8, 11:52 PM ESTSevere Thunderstorm WarningILNAdams38 min
Jan 8, 11:57 PM ESTSevere Thunderstorm WarningILNMadison, Union48 min
Jan 9, 12:07 AM ESTSevere Thunderstorm WarningILNAdams, Highland, Pike, Scioto38 min
Jan 9, 12:15 AM ESTSevere Thunderstorm WarningILNFayette, Pickaway, Ross33 min
Jan 9, 12:53 AM ESTSevere Thunderstorm WarningILNFairfield, Licking52 min
Jan 9, 1:03 AM ESTSevere Thunderstorm WarningILNFairfield, Hocking42 min

Discussions around it

SPC mesoscale discussions over the same counties from four hours before the watch to its end.

The nearest sounding before it

Cncnati-Daytn, OH (KILN), launched 00:00Z, 3.1 hours before the alert went out and 43 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-pSkew-T log-p diagram, Cncnati-Daytn, OH at 00:00Z on 2008-01-09Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 63 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Cncnati-Daytn, OH at 00:00Z on 2008-01-09The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 428 square meters per square second.1939587897Sfc1 km3 km6 km9 kmRMLM
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
63 J/kg
Mixed-layer CIN
-37 J/kg
Mixed-layer LCL
1018 m above ground
0-6 km bulk shear
60 kt
0-1 km storm-relative helicity
428 m²/s²
0-3 km storm-relative helicity
454 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.2

Open this sounding in Storm Lab

SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Jan 8, 9:01 PM ESTMesoscale DiscussionSPCClark, Crawford, Dearborn, Decatur, Fayette, Floyd and 14 more89 min
Jan 9, 12:26 AM ESTMesoscale DiscussionSPCBoyd, Carter, Fleming, Greenup, Lewis, Rowan94 min
Jan 9, 12:53 AM ESTSevere Thunderstorm WatchSPCBoyd, Carter, Greenup, Lawrence3 hr
Jan 8, 11:30 PM ESTMesoscale DiscussionSPCAshland, Crawford, Erie, Holmes, Huron, Medina and 8 more60 min

Nearby

Tornado Watches in Ohio, 2008Tornado Watches in Kentucky, 2008Tornado Watches in Indiana, 2008Every tornado watch in 2008

Sources

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