Alert archive / Kentucky / Mesoscale Discussions in 2009

Mesoscale Discussion 900

May 30, 20094 states

The Storm Prediction Center issued this mesoscale discussion at May 30, 2009, 3:51 PM EDT for 4 states. It was in force for 84 min.

The area

The outline as issued.

The facts

Issued: May 30, 2009, 3:51 PM EDT (19:51 UTC)
Expired: May 30, 2009, 5:15 PM EDT
In force: 84 min
Issued by: the Storm Prediction Center

All 72 counties

Ohio County, IN, Switzerland County, IN, Anderson County, KY, Bath County, KY, Boone County, KY, Bourbon County, KY, Boyd County, KY, Boyle County, KY, Bracken County, KY, Breathitt County, KY, Campbell County, KY, Carroll County, KY, Carter County, KY, Casey County, KY, Clark County, KY, Clay County, KY, Elliott County, KY, Estill County, KY, Fayette County, KY, Fleming County, KY, Floyd County, KY, Franklin County, KY, Gallatin County, KY, Garrard County, KY, Grant County, KY, Greenup County, KY, Harrison County, KY, Henry County, KY, Jackson County, KY, Jessamine County, KY, Johnson County, KY, Kenton County, KY, Knott County, KY, Laurel County, KY, Lawrence County, KY, Lee County, KY, Leslie County, KY, Letcher County, KY, Lewis County, KY, Lincoln County, KY, Madison County, KY, Magoffin County, KY, Marion County, KY, Martin County, KY, Mason County, KY, Menifee County, KY, Mercer County, KY, Montgomery County, KY, Morgan County, KY, Nicholas County, KY, Owen County, KY, Owsley County, KY, Pendleton County, KY, Perry County, KY, Pike County, KY, Powell County, KY, Pulaski County, KY, Robertson County, KY, Rockcastle County, KY, Rowan County, KY, Scott County, KY, Shelby County, KY, Washington County, KY, Wolfe County, KY, Woodford County, KY, Adams County, OH, Brown County, OH, Cabell County, WV, Lincoln County, WV, Logan County, WV, Mingo County, WV, Wayne County, WV

The radar

The Jackson,KY radar (KJKL), 75 km from the middle of the area, began a volume at 19:52 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 316May 30, 4:50 PM EDT

The nearest sounding before it

Cncnati-Daytn, OH (KILN), launched 12:00Z, 7.9 hours before the alert went out and 157 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: 1948 m above ground
0-6 km bulk shear: 71 kt
0-1 km storm-relative helicity: 30 m²/s²
0-3 km storm-relative helicity: 160 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
May 30, 4:49 PM EDT	Severe Thunderstorm Watch	SPC	Bartholomew, Brown, Clark, Clay, Crawford, Daviess and 25 more	11 hr
May 30, 7:01 PM EDT	Mesoscale Discussion	SPC	Bartholomew, Benton, Boone, Brown, Carroll, Cass and 62 more	59 min
May 30, 7:29 PM EDT	Severe Thunderstorm Watch	SPC	Adams, Blackford, Boone, Carroll, Cass, Clinton and 32 more	4 hr

Nearby

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