Alert archive / Indiana / Mesoscale Discussions in 2013

Mesoscale Discussion 1997

October 31, 20135 states

The Storm Prediction Center issued this mesoscale discussion at Oct 31, 2013, 7:44 PM CDT for 5 states. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued: Oct 31, 2013, 7:44 PM CDT (00:44 UTC)
Expired: Oct 31, 2013, 9:45 PM CDT
In force: 2 hr
Issued by: the Storm Prediction Center

All 83 counties

Clay County, AR, Alexander County, IL, Edwards County, IL, Franklin County, IL, Gallatin County, IL, Hamilton County, IL, Hardin County, IL, Johnson County, IL, Lawrence County, IL, Massac County, IL, Pope County, IL, Pulaski County, IL, Saline County, IL, Union County, IL, Wabash County, IL, White County, IL, Williamson County, IL, Bartholomew County, IN, Brown County, IN, Clark County, IN, Clay County, IN, Crawford County, IN, Daviess County, IN, Decatur County, IN, Dubois County, IN, Floyd County, IN, Gibson County, IN, Greene County, IN, Hancock County, IN, Harrison County, IN, Jackson County, IN, Jefferson County, IN, Jennings County, IN, Johnson County, IN, Knox County, IN, Lawrence County, IN, Marion County, IN, Martin County, IN, Monroe County, IN, Morgan County, IN, Orange County, IN, Owen County, IN, Perry County, IN, Pike County, IN, Posey County, IN, Putnam County, IN, Rush County, IN, Scott County, IN, Shelby County, IN, Spencer County, IN, Sullivan County, IN, Vanderburgh County, IN, Vigo County, IN, Warrick County, IN, Washington County, IN, Ballard County, KY, Breckinridge County, KY, Bullitt County, KY, Caldwell County, KY, Carlisle County, KY, Crittenden County, KY, Daviess County, KY, Hancock County, KY, Hardin County, KY, Henderson County, KY, Hopkins County, KY, Jefferson County, KY, Livingston County, KY, Lyon County, KY, McCracken County, KY, McLean County, KY, Meade County, KY, Ohio County, KY, Oldham County, KY, Spencer County, KY, Trimble County, KY, Union County, KY, Webster County, KY, Cape Girardeau County, MO, Mississippi County, MO, New Madrid County, MO, Scott County, MO, Stoddard County, MO

The radar

The Evansville,IN radar (KVWX), 14 km from the middle of the area, began a volume at 00:47 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.

The nearest sounding before it

Lincoln, IL (KILX), launched 00:00Z, 0.7 hours before the alert went out and 236 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: 1 J/kg
Mixed-layer CIN: 0 J/kg
Mixed-layer LCL: 546 m above ground
0-6 km bulk shear: 69 kt
0-1 km storm-relative helicity: -53 m²/s²
0-3 km storm-relative helicity: 4 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
Oct 31, 7:39 PM CDT	Mesoscale Discussion	SPC	Craighead, Mississippi, Poinsett	66 min
Oct 31, 7:54 PM CDT	Tornado Watch	SPC	Mississippi	5 hr
Oct 31, 8:53 PM CDT	Mesoscale Discussion	SPC	Adams, Blackford, Dearborn, Decatur, Delaware, Fayette and 13 more	2 hr
Oct 31, 9:09 PM CDT	Severe Thunderstorm Watch	SPC	Dearborn, Fayette, Franklin, Ohio, Ripley, Switzerland and 2 more	6 hr
Oct 31, 10:11 PM CDT	Mesoscale Discussion	SPC	Clark, Floyd, Harrison, Jefferson, Scott, Switzerland	64 min
Oct 31, 11:39 PM CDT	Mesoscale Discussion	SPC	Bracken, Campbell, Gallatin, Grant, Greenup, Harrison and 7 more	96 min
Oct 31, 11:46 PM CDT	Severe Thunderstorm Watch	SPC	Bath, Bell, Breathitt, Clay, Elliott, Estill and 28 more	5 hr
Nov 1, 2:37 AM CDT	Mesoscale Discussion	SPC	Bell, Floyd, Harlan, Knott, Letcher, Martin and 1 more	83 min

Nearby

Mesoscale Discussions in Indiana, 2013 Mesoscale Discussions in Kentucky, 2013 Mesoscale Discussions in Illinois, 2013 Every mesoscale discussion in 2013

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.