Alert archive / Ohio / Severe Thunderstorm Watches in 2011

Severe Thunderstorm Watch 436

June 7, 201124 counties in Ohio; 7 counties in Pennsylvania; Hancock County, West Virginia

The Storm Prediction Center issued this severe thunderstorm watch at Jun 7, 2011, 6:47 AM EDT for 24 counties in Ohio; 7 counties in Pennsylvania; Hancock County, West Virginia. It was in force for 5 hr.

The area

The outline as issued.

The facts

Issued: Jun 7, 2011, 6:47 AM EDT (10:47 UTC)
Expired: Jun 7, 2011, 12:00 PM EDT
In force: 5 hr
Issued by: the Storm Prediction Center
Largest hail expected: 2 in
Strongest gust expected: 60 kt

All 32 counties

Ashland County, OH, Ashtabula County, OH, Carroll County, OH, Columbiana County, OH, Coshocton County, OH, Cuyahoga County, OH, Erie County, OH, Geauga County, OH, Harrison County, OH, Holmes County, OH, Huron County, OH, Jefferson County, OH, Knox County, OH, Lake County, OH, Lorain County, OH, Mahoning County, OH, Medina County, OH, Portage County, OH, Richland County, OH, Stark County, OH, Summit County, OH, Trumbull County, OH, Tuscarawas County, OH, Wayne County, OH, Beaver County, PA, Butler County, PA, Crawford County, PA, Erie County, PA, Lawrence County, PA, Mercer County, PA, Venango County, PA, Hancock County, WV

The radar

The Cleveland radar (KCLE), 47 km from the middle of the area, began a volume at 10:49 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: 5%
One or more EF2 to EF5 tornadoes: 2%
Ten or more severe wind reports: 30%
One or more gusts of 65 knots or more: 20%
Ten or more severe hail reports: 50%
One or more hailstones of 2 inches or more: 20%
Six or more combined severe hail and wind reports: 70%

Warnings issued inside it

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

Issued	Product	Office	Counties	Lasted
Jun 7, 6:56 AM EDT	Severe Thunderstorm Warning	CLE	Ashtabula	64 min
Jun 7, 7:15 AM EDT	Severe Thunderstorm Warning	CLE	Geauga, Lake	75 min
Jun 7, 7:49 AM EDT	Severe Thunderstorm Warning	PBZ	Armstrong, Butler, Clarion, Lawrence, Mercer, Venango	56 min
Jun 7, 7:50 AM EDT	Severe Thunderstorm Warning	CLE	Ashtabula, Trumbull	70 min
Jun 7, 8:21 AM EDT	Severe Thunderstorm Warning	CLE	Cuyahoga	39 min
Jun 7, 8:24 AM EDT	Severe Thunderstorm Warning	CLE	Portage	66 min
Jun 7, 8:32 AM EDT	Severe Thunderstorm Warning	CLE	Erie, Huron, Lorain	58 min
Jun 7, 8:43 AM EDT	Severe Thunderstorm Warning	PBZ	Carroll, Columbiana	47 min
Jun 7, 8:44 AM EDT	Severe Thunderstorm Warning	CLE	Mahoning	61 min
Jun 7, 9:24 AM EDT	Severe Thunderstorm Warning	PBZ	Carroll, Columbiana, Harrison, Jefferson	51 min
Jun 7, 9:28 AM EDT	Severe Thunderstorm Warning	CLE	Erie, Huron, Lorain, Medina	77 min
Jun 7, 9:35 AM EDT	Flash Flood Warning	CLE	Lorain	4 hr
Jun 7, 9:39 AM EDT	Severe Thunderstorm Warning	CLE	Stark	66 min
Jun 7, 9:59 AM EDT	Severe Thunderstorm Warning	PBZ	Carroll, Coshocton, Harrison, Tuscarawas	46 min
Jun 7, 10:03 AM EDT	Severe Thunderstorm Warning	CLE	Wayne	72 min
Jun 7, 10:18 AM EDT	Severe Thunderstorm Warning	PBZ	Jefferson	27 min
Jun 7, 10:22 AM EDT	Severe Thunderstorm Warning	CLE	Ashland, Huron, Lorain, Medina	68 min
Jun 7, 10:44 AM EDT	Severe Thunderstorm Warning	CLE	Holmes	76 min
Jun 7, 11:24 AM EDT	Severe Thunderstorm Warning	PBZ	Coshocton, Muskingum	36 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

Pittsburgh, PA (KPIT), launched 00:00Z, 10.8 hours before the alert went out and 140 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: 2389 m above ground
0-6 km bulk shear: 31 kt
0-1 km storm-relative helicity: 30 m²/s²
0-3 km storm-relative helicity: 110 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
Jun 7, 5:29 AM EDT	Mesoscale Discussion	SPC	Ashland, Ashtabula, Columbiana, Cuyahoga, Erie, Geauga and 11 more	3 hr
Jun 7, 8:22 AM EDT	Mesoscale Discussion	SPC	Ashland, Ashtabula, Carroll, Columbiana, Coshocton, Cuyahoga and 15 more	113 min
Jun 7, 10:32 AM EDT	Mesoscale Discussion	SPC	Ashland, Athens, Belmont, Carroll, Coshocton, Crawford and 25 more	88 min
Jun 7, 2:56 PM EDT	Mesoscale Discussion	SPC	Adams, Brown, Champaign, Clark, Clermont, Clinton and 15 more	94 min
Jun 7, 6:04 PM EDT	Mesoscale Discussion	SPC	Logan, McDowell, Mercer, Mingo, Monroe, Raleigh and 2 more	116 min

Nearby

Severe Thunderstorm Watches in Ohio, 2011 Severe Thunderstorm Watches in Pennsylvania, 2011 Severe Thunderstorm Watches in West Virginia, 2011 Every severe thunderstorm watch 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.