Alert archive / Kentucky / Mesoscale Discussions in 2007

Mesoscale Discussion 402

March 31, 20074 states

The Storm Prediction Center issued this mesoscale discussion at Mar 31, 2007, 7:10 PM CDT for 4 states. It was in force for 65 min.

The area

The outline as issued.

The facts

Issued: Mar 31, 2007, 7:10 PM CDT (00:10 UTC)
Expired: Mar 31, 2007, 8:15 PM CDT
In force: 65 min
Issued by: the Storm Prediction Center

All 27 counties

Alexander County, IL, Hardin County, IL, Johnson County, IL, Massac County, IL, Pope County, IL, Pulaski County, IL, Saline County, IL, Union County, IL, Williamson County, IL, Ballard County, KY, Calloway County, KY, Carlisle County, KY, Crittenden County, KY, Fulton County, KY, Graves County, KY, Hickman County, KY, Livingston County, KY, Marshall County, KY, McCracken County, KY, Mississippi County, MO, New Madrid County, MO, Pemiscot County, MO, Scott County, MO, Dyer County, TN, Lake County, TN, Obion County, TN, Weakley County, TN

The radar

The Paducah radar (KPAH), 46 km from the middle of the area, began a volume at 00:10 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

Lincoln, IL (KILX), launched 00:00Z, 0.2 hours before the alert went out and 376 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: 389 J/kg
Mixed-layer CIN: -2 J/kg
Mixed-layer LCL: 844 m above ground
0-6 km bulk shear: 41 kt
0-1 km storm-relative helicity: 158 m²/s²
0-3 km storm-relative helicity: 177 m²/s²
Significant tornado parameter: 0.2
Supercell composite: 1.6

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
Mar 31, 7:25 PM CDT	Mesoscale Discussion	SPC	Boone, Bureau, Carroll, Cass, Champaign, Christian and 37 more	65 min
Mar 31, 8:33 PM CDT	Tornado Watch	SPC	Cook, DuPage, Iroquois, Kankakee, Lake, Vermilion and 1 more	3 hr
Mar 31, 9:17 PM CDT	Mesoscale Discussion	SPC	Bond, Boone, Champaign, Christian, Clinton, Coles and 36 more	58 min
Apr 1, 2:06 PM CDT	Mesoscale Discussion	SPC	Greenup	84 min

Nearby

Mesoscale Discussions in Kentucky, 2007 Mesoscale Discussions in Illinois, 2007 Mesoscale Discussions in Missouri, 2007 Every mesoscale discussion in 2007

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.