Alert archive / Ohio / Mesoscale Discussions in 2009

Mesoscale Discussion 1239

June 19, 20094 states

The Storm Prediction Center issued this mesoscale discussion at Jun 19, 2009, 5:56 PM EDT for 4 states. It was in force for 64 min.

The area

The outline as issued.

The facts

Issued: Jun 19, 2009, 5:56 PM EDT (21:56 UTC)
Expired: Jun 19, 2009, 7:00 PM EDT
In force: 64 min
Issued by: the Storm Prediction Center

All 35 counties

Garrett County, MD, Ashland County, OH, Belmont County, OH, Carroll County, OH, Columbiana County, OH, Coshocton County, OH, Guernsey County, OH, Harrison County, OH, Holmes County, OH, Jefferson County, OH, Knox County, OH, Monroe County, OH, Muskingum County, OH, Noble County, OH, Stark County, OH, Tuscarawas County, OH, Wayne County, OH, Fayette County, PA, Greene County, PA, Washington County, PA, Barbour County, WV, Brooke County, WV, Grant County, WV, Hancock County, WV, Harrison County, WV, Marion County, WV, Marshall County, WV, Mineral County, WV, Monongalia County, WV, Ohio County, WV, Preston County, WV, Taylor County, WV, Tucker County, WV, Tyler County, WV, Wetzel County, WV

The radar

The Pittsburgh radar (KPBZ), 76 km from the middle of the area, began a volume at 21:59 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.

The watches that followed

Watches SPC issued over any of the same counties within four hours of this discussion.

Severe Thunderstorm Watch 482Jun 19, 6:30 PM EDT

The nearest sounding before it

Pittsburgh, PA (KPIT), launched 12:00Z, 9.9 hours before the alert went out and 70 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: 883 m above ground
0-6 km bulk shear: 29 kt
0-1 km storm-relative helicity: 133 m²/s²
0-3 km storm-relative helicity: 158 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

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

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SPC that day

Everything else SPC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jun 19, 6:28 PM EDT	Severe Thunderstorm Watch	SPC	Allegany, Garrett	3 hr
Jun 19, 3:38 AM EDT	Mesoscale Discussion	SPC	Allen, Auglaize, Darke, Defiance, Fulton, Hancock and 8 more	97 min
Jun 19, 4:16 AM EDT	Severe Thunderstorm Watch	SPC	Allen, Auglaize, Champaign, Clark, Crawford, Darke and 32 more	6 hr
Jun 19, 7:37 AM EDT	Mesoscale Discussion	SPC	Allen, Ashland, Athens, Auglaize, Champaign, Clark and 46 more	83 min
Jun 19, 2:37 PM EDT	Mesoscale Discussion	SPC	Allen, Auglaize, Champaign, Clark, Crawford, Darke and 24 more	83 min
Jun 19, 6:11 PM EDT	Mesoscale Discussion	SPC	Allen, Auglaize, Butler, Champaign, Clark, Clermont and 35 more	94 min
Jun 19, 6:59 PM EDT	Tornado Watch	SPC	Allen, Auglaize, Butler, Clermont, Darke, Defiance and 13 more	8 hr
Jun 19, 7:04 PM EDT	Mesoscale Discussion	SPC	Lucas	86 min

Nearby

Mesoscale Discussions in Ohio, 2009 Mesoscale Discussions in West Virginia, 2009 Mesoscale Discussions in Pennsylvania, 2009 Every mesoscale discussion in 2009

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.