Alert archive / Ohio / Severe Thunderstorm Watches in 2014

Severe Thunderstorm Watch 564

December 24, 201454 counties in Ohio; 10 counties in Pennsylvania; 11 counties in West Virginia

The Storm Prediction Center issued this severe thunderstorm watch at Dec 24, 2014, 4:23 PM EST for 54 counties in Ohio; 10 counties in Pennsylvania; 11 counties in West Virginia. It was in force for 5 hr.

The area

The outline as issued.

The facts

Issued: Dec 24, 2014, 4:23 PM EST (21:23 UTC)
Expired: Dec 24, 2014, 9:20 PM EST
In force: 5 hr
Issued by: the Storm Prediction Center
Largest hail expected: 0.5 in
Strongest gust expected: 60 kt

All 75 counties

Adams County, OH, Ashland County, OH, Ashtabula County, OH, Athens County, OH, Belmont County, OH, Carroll County, OH, Columbiana County, OH, Coshocton County, OH, Crawford County, OH, Cuyahoga County, OH, Delaware County, OH, Fairfield County, OH, Fayette County, OH, Franklin County, OH, Gallia County, OH, Geauga County, OH, Guernsey County, OH, Harrison County, OH, Highland County, OH, Hocking County, OH, Holmes County, OH, Huron County, OH, Jackson County, OH, Jefferson County, OH, Knox County, OH, Lake County, OH, Lawrence County, OH, Licking County, OH, Lorain County, OH, Madison County, OH, Mahoning County, OH, Marion County, OH, Medina County, OH, Meigs County, OH, Monroe County, OH, Morgan County, OH, Morrow County, OH, Muskingum County, OH, Noble County, OH, Perry County, OH, Pickaway County, OH, Pike County, OH, Portage County, OH, Richland County, OH, Ross County, OH, Scioto County, OH, Stark County, OH, Summit County, OH, Trumbull County, OH, Tuscarawas County, OH, Union County, OH, Vinton County, OH, Washington County, OH, Wayne County, OH, Allegheny County, PA, Beaver County, PA, Butler County, PA, Crawford County, PA, Erie County, PA, Greene County, PA, Lawrence County, PA, Mercer County, PA, Venango County, PA, Washington County, PA, Brooke County, WV, Cabell County, WV, Hancock County, WV, Jackson County, WV, Marshall County, WV, Mason County, WV, Ohio County, WV, Pleasants County, WV, Tyler County, WV, Wetzel County, WV, Wood County, WV

The radar

The Cleveland radar (KCLE), 149 km from the middle of the area, began a volume at 21:25 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: 10%
One or more EF2 to EF5 tornadoes: 2%
Ten or more severe wind reports: 40%
One or more gusts of 65 knots or more: 5%
Ten or more severe hail reports: 5%
One or more hailstones of 2 inches or more: 5%
Six or more combined severe hail and wind reports: 80%

Warnings issued inside it

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

Issued	Product	Office	Counties	Lasted
Dec 24, 4:23 PM EST	Severe Thunderstorm Warning	ILN	Fairfield, Fayette, Hocking, Pickaway, Pike, Ross and 1 more	52 min
Dec 24, 4:39 PM EST	Severe Thunderstorm Warning	ILN	Fairfield, Franklin, Licking, Pickaway	51 min
Dec 24, 4:41 PM EST	Severe Thunderstorm Warning	RLX	Gallia, Jackson, Lawrence	49 min
Dec 24, 4:46 PM EST	Severe Thunderstorm Warning	RLX	Athens, Jackson, Vinton	44 min
Dec 24, 5:00 PM EST	Severe Thunderstorm Warning	ILN	Fairfield, Hocking, Pickaway, Ross	45 min
Dec 24, 5:36 PM EST	Severe Thunderstorm Warning	ILN	Licking	24 min
Dec 24, 5:43 PM EST	Severe Thunderstorm Warning	PBZ	Coshocton, Muskingum	32 min
Dec 24, 5:51 PM EST	Severe Thunderstorm Warning	RLX	Athens, Morgan, Perry, Washington	39 min
Dec 24, 6:06 PM EST	Severe Thunderstorm Warning	PBZ	Coshocton, Guernsey, Muskingum, Noble, Tuscarawas	24 min
Dec 24, 6:10 PM EST	Severe Thunderstorm Warning	CLE	Erie, Huron, Lorain	50 min
Dec 24, 6:27 PM EST	Severe Thunderstorm Warning	PBZ	Carroll, Coshocton, Guernsey, Harrison, Tuscarawas	33 min
Dec 24, 6:46 PM EST	Severe Thunderstorm Warning	CLE	Cuyahoga	44 min
Dec 24, 7:36 PM EST	Severe Thunderstorm Warning	PBZ	Columbiana, Jefferson	24 min
Dec 24, 8:01 PM EST	Severe Thunderstorm Warning	PBZ	Allegheny, Beaver, Butler, Washington	29 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 12:00Z, 9.4 hours before the alert went out and 159 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 889 m above ground
0-6 km bulk shear: 57 kt
0-1 km storm-relative helicity: 163 m²/s²
0-3 km storm-relative helicity: 190 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

SPC that day

Everything else SPC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Dec 24, 3:21 PM EST	Mesoscale Discussion	SPC	Adams, Ashland, Athens, Belmont, Brown, Carroll and 55 more	114 min

Nearby

Severe Thunderstorm Watches in Ohio, 2014 Severe Thunderstorm Watches in West Virginia, 2014 Severe Thunderstorm Watches in Pennsylvania, 2014 Every severe thunderstorm watch in 2014

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.