Alert archive / Indiana / Mesoscale Discussions in 2018

Mesoscale Discussion 67

February 15, 2018Clark County, Crawford County, Illinois; 28 counties in Indiana; 9 counties in Ohio

The Storm Prediction Center issued this mesoscale discussion at Feb 15, 2018, 5:51 PM CST for Clark County, Crawford County, Illinois; 28 counties in Indiana; 9 counties in Ohio. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued: Feb 15, 2018, 5:51 PM CST (23:51 UTC)
Expired: Feb 15, 2018, 8:15 PM CST
In force: 2 hr
Issued by: the Storm Prediction Center
Chance of a watch: 20%

All 39 counties

Clark County, IL, Crawford County, IL, Bartholomew County, IN, Boone County, IN, Brown County, IN, Clay County, IN, Decatur County, IN, Delaware County, IN, Fayette County, IN, Franklin County, IN, Greene County, IN, Hamilton County, IN, Hancock County, IN, Hendricks County, IN, Henry County, IN, Johnson County, IN, Madison County, IN, Marion County, IN, Monroe County, IN, Morgan County, IN, Owen County, IN, Parke County, IN, Putnam County, IN, Randolph County, IN, Rush County, IN, Shelby County, IN, Sullivan County, IN, Union County, IN, Vigo County, IN, Wayne County, IN, Butler County, OH, Clark County, OH, Darke County, OH, Greene County, OH, Miami County, OH, Montgomery County, OH, Preble County, OH, Shelby County, OH, Warren County, OH

The radar

The Indianapolis radar (KIND), 31 km from the middle of the area, began a volume at 23:51 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

Nashville Metro, TN (KBNA), launched 12:00Z, 11.9 hours before the alert went out and 396 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: 19 J/kg
Mixed-layer CIN: -8 J/kg
Mixed-layer LCL: 619 m above ground
0-6 km bulk shear: 64 kt
0-1 km storm-relative helicity: 377 m²/s²
0-3 km storm-relative helicity: 440 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

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Nearby

Mesoscale Discussions in Indiana, 2018 Mesoscale Discussions in Ohio, 2018 Mesoscale Discussions in Illinois, 2018 Every mesoscale discussion in 2018

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.