Alert archive / Indiana / Mesoscale Discussions in 2008

Mesoscale Discussion 2234

September 8, 20084 states

The Storm Prediction Center issued this mesoscale discussion at Sep 8, 2008, 9:49 PM CDT for 4 states. It was in force for 86 min.

The area

The outline as issued.

The facts

Issued: Sep 8, 2008, 9:49 PM CDT (02:49 UTC)
Expired: Sep 8, 2008, 11:15 PM CDT
In force: 86 min
Issued by: the Storm Prediction Center

All 68 counties

Clark County, IL, Clay County, IL, Clinton County, IL, Crawford County, IL, Cumberland County, IL, Edgar County, IL, Edwards County, IL, Effingham County, IL, Fayette County, IL, Franklin County, IL, Gallatin County, IL, Hamilton County, IL, Hardin County, IL, Jackson County, IL, Jasper County, IL, Jefferson County, IL, Johnson County, IL, Lawrence County, IL, Marion County, IL, Perry County, IL, Randolph County, IL, Richland County, IL, Saline County, IL, Union County, IL, Wabash County, IL, Washington County, IL, Wayne County, IL, White County, IL, Williamson County, IL, Bartholomew County, IN, Boone County, IN, Brown County, IN, Clay County, IN, Daviess County, IN, Decatur County, IN, Dubois County, IN, Fayette County, IN, Gibson County, IN, Greene County, IN, Hancock County, IN, Hendricks County, IN, Jackson County, IN, Jennings County, IN, Johnson County, IN, Knox County, IN, Lawrence County, IN, Marion County, IN, Martin County, IN, Monroe County, IN, Montgomery County, IN, Morgan County, IN, Orange County, IN, Owen County, IN, Parke County, IN, Pike County, IN, Posey County, IN, Putnam County, IN, Rush County, IN, Shelby County, IN, Sullivan County, IN, Vanderburgh County, IN, Vigo County, IN, Warrick County, IN, Washington County, IN, Henderson County, KY, Union County, KY, Perry County, MO, Sainte Genevieve County, MO

The radar

The Evansville,IN radar (KVWX), 58 km from the middle of the area, began a volume at 02:48 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, 2.8 hours before the alert went out and 202 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: 23 J/kg
Mixed-layer CIN: -235 J/kg
Mixed-layer LCL: 469 m above ground
0-6 km bulk shear: 50 kt
0-1 km storm-relative helicity: 74 m²/s²
0-3 km storm-relative helicity: 201 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 1.2

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
Sep 8, 7:04 PM CDT	Severe Thunderstorm Watch	SPC	Bond, Champaign, Christian, Clark, Clay, Clinton and 34 more	6 hr

Nearby

Mesoscale Discussions in Indiana, 2008 Mesoscale Discussions in Illinois, 2008 Mesoscale Discussions in Kentucky, 2008 Every mesoscale discussion in 2008

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.