Alert archive / Indiana / Mesoscale Discussions in 2012

Mesoscale Discussion 22

January 17, 20124 states

The Storm Prediction Center issued this mesoscale discussion at Jan 17, 2012, 6:25 AM CST for 4 states. It was in force for 65 min.

The area

The outline as issued.

The facts

Issued: Jan 17, 2012, 6:25 AM CST (12:25 UTC)
Expired: Jan 17, 2012, 7:30 AM CST
In force: 65 min
Issued by: the Storm Prediction Center

All 102 counties

Clark County, IL, Clay County, IL, Crawford County, IL, Cumberland County, IL, Edgar County, IL, Edwards County, IL, Franklin County, IL, Hamilton County, IL, Jackson County, IL, Jasper County, IL, Jefferson County, IL, Lawrence County, IL, Marion County, IL, Perry County, IL, Randolph County, IL, Richland County, IL, Wabash County, IL, Washington County, IL, Wayne County, IL, White County, IL, Williamson County, IL, Adams County, IN, Allen County, IN, Bartholomew County, IN, Blackford County, IN, Boone County, IN, Brown County, IN, Carroll County, IN, Cass County, IN, Clay County, IN, Clinton County, IN, Daviess County, IN, Dearborn County, IN, Decatur County, IN, Delaware County, IN, Fayette County, IN, Fountain County, IN, Franklin County, IN, Gibson County, IN, Grant County, IN, Greene County, IN, Hamilton County, IN, Hancock County, IN, Hendricks County, IN, Henry County, IN, Howard County, IN, Huntington County, IN, Jackson County, IN, Jay County, IN, Jennings County, IN, Johnson County, IN, Knox County, IN, Lawrence County, IN, Madison County, IN, Marion County, IN, Martin County, IN, Miami County, IN, Monroe County, IN, Montgomery County, IN, Morgan County, IN, Ohio County, IN, Orange County, IN, Owen County, IN, Parke County, IN, Pike County, IN, Putnam County, IN, Randolph County, IN, Ripley County, IN, Rush County, IN, Shelby County, IN, Sullivan County, IN, Tippecanoe County, IN, Tipton County, IN, Union County, IN, Vermillion County, IN, Vigo County, IN, Wabash County, IN, Wayne County, IN, Wells County, IN, Whitley County, IN, Perry County, MO, Allen County, OH, Auglaize County, OH, Butler County, OH, Champaign County, OH, Clark County, OH, Darke County, OH, Greene County, OH, Hamilton County, OH, Hancock County, OH, Hardin County, OH, Logan County, OH, Mercer County, OH, Miami County, OH, Montgomery County, OH, Paulding County, OH, Preble County, OH, Putnam County, OH, Shelby County, OH, Union County, OH, Van Wert County, OH, Warren County, OH

The radar

The Indianapolis radar (KIND), 39 km from the middle of the area, began a volume at 12:26 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 12:00Z, 0.4 hours before the alert went out and 188 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: 557 m above ground
0-6 km bulk shear: 87 kt
0-1 km storm-relative helicity: -88 m²/s²
0-3 km storm-relative helicity: -55 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.

131 
ACUS11 KWNS 171226
SWOMCD
SPC MCD 171225
OHZ000-KYZ000-INZ000-ILZ000-MOZ000-171330-

MESOSCALE DISCUSSION 0022
NWS STORM PREDICTION CENTER NORMAN OK
0625 AM CST TUE JAN 17 2012

AREAS AFFECTED...PARTS OF SE MO...CNTRL/SRN IL AND IND...INTO WRN OH

CONCERNING...TORNADO WATCH 1...

VALID 171225Z - 171330Z

THE SEVERE WEATHER THREAT FOR TORNADO WATCH 1 CONTINUES.

BUT THE SEVERE POTENTIAL APPEARS TO BE IN THE PROCESS OF BECOMING
MORE LOCALIZED AND DIMINISHING...AND A NEW WW IS NOT CURRENTLY
ANTICIPATED.

THE INTERSECTION OF THE RETREATING WESTERN SEGMENT OF A BOUNDARY
GENERATED BY THE WEAKENING INITIAL CONVECTIVE CLUSTER...NOW
SPREADING ACROSS INDIANA INTO WESTERN OHIO...AND THE SOUTHEASTWARD
SURGING COLD FRONT APPEARS TO BE THE FOCUS FOR THE MOST VIGOROUS
CURRENT STORM ACTIVITY.  THIS HAS RECENTLY SHIFTED EAST OF THE ST.
LOUIS AREA...AND COULD MAINTAIN STRENGTH AS IT SPREADS EASTWARD
BETWEEN THE INTERSTATE 64 AND 70 CORRIDORS OF SOUTHEASTERN ILLINOIS
AND SOUTHERN INDIANA BETWEEN NOW AND 14-16Z.  THEREAFTER...ACTIVITY
IS EXPECTED TO WEAKEN FURTHER AND DIMINISH...AS STRONGER MID-LEVEL
FORCING FOR UPWARD VERTICAL MOTION BEGINS TO LIFT NORTHEAST OF THE
WARM SECTOR OF THE DEEPENING SURFACE LOW MIGRATING ACROSS THE
SOUTHERN GREAT LAKES REGION.

UNTIL THEN...GIVEN THE CONTINUING PRESENCE OF STRONG LOW-LEVEL SHEAR
NEAR A 50-70 KT WEST SOUTHWESTERLY 850 MB JET AXIS...UPDRAFT
ROTATION WILL REMAIN POSSIBLE WITH NEAR SURFACE BASED
CONVECTION...WHICH MAY BE CAPABLE OF PRODUCING MARGINALLY SEVERE
HAIL AND LOCALIZED STRONG WIND GUSTS.  CAPE APPEARS LIKELY TO REMAIN
QUITE WEAK...LIMITING THE POTENTIAL FOR A MORE SUBSTANTIVE ORGANIZED
SEVERE WEATHER THREAT.  GIVEN THE STABILITY OF THE NEAR SURFACE
AIR...TORNADIC POTENTIAL IS EVEN MORE QUESTIONABLE...BUT MAY NOT BE
COMPLETELY NEGLIGIBLE.

..KERR.. 01/17/2012

...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT...

ATTN...WFO...CLE...ILN...LMK...IWX...IND...PAH...ILX...LSX...

LAT...LON   39758795 40378726 41278537 41228352 40178322 39358395
            38968486 38288723 37758870 37449060 39128849 39758795

SPC that day

Everything else SPC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jan 16, 11:47 PM CST	Tornado Watch	SPC	Bond, Calhoun, Clinton, Fayette, Greene, Jersey and 8 more	7 hr
Jan 17, 1:50 AM CST	Mesoscale Discussion	SPC	Bond, Champaign, Christian, Clark, Clay, Clinton and 31 more	85 min
Jan 16, 10:24 PM CST	Mesoscale Discussion	SPC	Andrew, Atchison, DeKalb, Gentry, Harrison, Holt and 3 more	5 hr
Jan 16, 11:23 PM CST	Mesoscale Discussion	SPC	Barry, Camden, Cedar, Christian, Cole, Crawford and 20 more	2 hr

Nearby

Mesoscale Discussions in Indiana, 2012 Mesoscale Discussions in Illinois, 2012 Mesoscale Discussions in Ohio, 2012 Every mesoscale discussion in 2012

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.