Alert archive / Kentucky / Mesoscale Discussions in 2009

Mesoscale Discussion 405

April 6, 20095 states

The Storm Prediction Center issued this mesoscale discussion at Apr 6, 2009, 12:08 AM EDT for 5 states. It was in force for 67 min.

The area

The outline as issued.

The facts

Issued: Apr 6, 2009, 12:08 AM EDT (04:08 UTC)
Expired: Apr 6, 2009, 1:15 AM EDT
In force: 67 min
Issued by: the Storm Prediction Center

All 91 counties

Bell County, KY, Boyd County, KY, Breathitt County, KY, Carter County, KY, Clay County, KY, Elliott County, KY, Estill County, KY, Floyd County, KY, Greenup County, KY, Harlan County, KY, Jackson County, KY, Johnson County, KY, Knott County, KY, Knox County, KY, Laurel County, KY, Lawrence County, KY, Lee County, KY, Leslie County, KY, Letcher County, KY, Magoffin County, KY, Martin County, KY, McCreary County, KY, Menifee County, KY, Morgan County, KY, Owsley County, KY, Perry County, KY, Pike County, KY, Powell County, KY, Rowan County, KY, Whitley County, KY, Wolfe County, KY, Athens County, OH, Gallia County, OH, Hocking County, OH, Jackson County, OH, Lawrence County, OH, Meigs County, OH, Scioto County, OH, Vinton County, OH, Washington County, OH, Anderson County, TN, Campbell County, TN, Claiborne County, TN, Cocke County, TN, Cumberland County, TN, Fentress County, TN, Grainger County, TN, Greene County, TN, Hamblen County, TN, Hancock County, TN, Hawkins County, TN, Jefferson County, TN, Knox County, TN, Loudon County, TN, Morgan County, TN, Roane County, TN, Scott County, TN, Sevier County, TN, Union County, TN, Buchanan County, VA, City of Norton, VA, Dickenson County, VA, Lee County, VA, Russell County, VA, Scott County, VA, Wise County, VA, Boone County, WV, Braxton County, WV, Cabell County, WV, Calhoun County, WV, Clay County, WV, Doddridge County, WV, Gilmer County, WV, Harrison County, WV, Jackson County, WV, Kanawha County, WV, Lewis County, WV, Lincoln County, WV, Logan County, WV, Mason County, WV, Mingo County, WV, Pleasants County, WV, Putnam County, WV, Ritchie County, WV, Roane County, WV, Taylor County, WV, Tyler County, WV, Wayne County, WV, Wirt County, WV, Wood County, WV, Wyoming County, WV

The radar

The Jackson,KY radar (KJKL), 41 km from the middle of the area, began a volume at 04:09 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 nearest sounding before it

Cncnati-Daytn, OH (KILN), launched 00:00Z, 4.1 hours before the alert went out and 249 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: 2014 m above ground
0-6 km bulk shear: 80 kt
0-1 km storm-relative helicity: 264 m²/s²
0-3 km storm-relative helicity: 547 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
Apr 5, 8:12 PM EDT	Mesoscale Discussion	SPC	Bath, Bell, Boyd, Breathitt, Carter, Clark and 38 more	63 min
Apr 5, 8:53 PM EDT	Severe Thunderstorm Watch	SPC	Bath, Bell, Boyd, Breathitt, Carter, Clay and 31 more	5 hr
Apr 6, 8:03 AM EDT	Tornado Watch	SPC	Accomack, Brunswick, Caroline, Charles City, Chesterfield, Dinwiddie and 36 more	7 hr
Apr 6, 10:33 AM EDT	Mesoscale Discussion	SPC	Accomack, Brunswick, Caroline, Charles City, Chesterfield, Dinwiddie and 36 more	57 min
Apr 6, 1:08 PM EDT	Mesoscale Discussion	SPC	Accomack, Gloucester, Lancaster, Mathews, Northampton, York and 8 more	67 min

Nearby

Mesoscale Discussions in Kentucky, 2009 Mesoscale Discussions in West Virginia, 2009 Mesoscale Discussions in Tennessee, 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.