Alert archive / Indiana / Mesoscale Discussions in 2011

Mesoscale Discussion 263

March 23, 201121 counties in Indiana; Darke County, Preble County, Ohio

The Storm Prediction Center issued this mesoscale discussion at Mar 23, 2011, 7:37 PM EDT for 21 counties in Indiana; Darke County, Preble County, Ohio. It was in force for 83 min.

The area

The outline as issued.

The facts

Issued: Mar 23, 2011, 7:37 PM EDT (23:37 UTC)
Expired: Mar 23, 2011, 9:00 PM EDT
In force: 83 min
Issued by: the Storm Prediction Center

All 23 counties

Boone County, IN, Clinton County, IN, Delaware County, IN, Fayette County, IN, Fountain County, IN, Franklin County, IN, Hamilton County, IN, Hancock County, IN, Hendricks County, IN, Henry County, IN, Madison County, IN, Marion County, IN, Montgomery County, IN, Parke County, IN, Putnam County, IN, Randolph County, IN, Rush County, IN, Shelby County, IN, Tipton County, IN, Union County, IN, Wayne County, IN, Darke County, OH, Preble County, OH

The radar

The Indianapolis radar (KIND), 39 km from the middle of the area, began a volume at 23:39 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

Cncnati-Daytn, OH (KILN), launched 12:00Z, 11.6 hours before the alert went out and 195 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: 1527 m above ground
0-6 km bulk shear: 70 kt
0-1 km storm-relative helicity: 311 m²/s²
0-3 km storm-relative helicity: 327 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.

657 
ACUS11 KWNS 232337
SWOMCD
SPC MCD 232337 
OHZ000-INZ000-240100-

MESOSCALE DISCUSSION 0263
NWS STORM PREDICTION CENTER NORMAN OK
0637 PM CDT WED MAR 23 2011

AREAS AFFECTED...CENTRAL IND INTO FAR WEST CENTRAL OH

CONCERNING...SEVERE POTENTIAL...WATCH UNLIKELY 

VALID 232337Z - 240100Z

ISOLATED THREAT FOR PRIMARILY HAIL WILL CONTINUE EARLY THIS EVENING
ACROSS CENTRAL INDIANA AND MAY SPREAD EWD INTO FAR WEST CENTRAL OH. 
SHORT DURATION OF THIS THREAT.../I.E. PRIOR TO THE ONSET OF DIURNAL
COOLING/ DOES NOT WARRANT THE NEED FOR A WW.

LATEST SURFACE/OBJECTIVE ANALYSES SHOWED A COLD FRONT EXTENDING
WNWWD FROM SRN OH TO AN AREA OF LOW PRESSURE LOCATED OVER FAR SWRN
OH/SERN IND...AND A SECOND AREA OF LOW LEVEL CONVERGENCE ATTENDANT
TO AN OUTFLOW BOUNDARY EXTENDING GENERALLY WWD THROUGH CENTRAL IND. 
FORCING ALONG THESE BOUNDARIES COMBINED WITH STRONG DEEP LAYER
ASCENT WITH A COMPACT SHORTWAVE TROUGH TRACKING EWD THROUGH IL/IND
AT THIS TIME WILL REMAIN SUPPORTIVE OF SUSTAINED UPDRAFTS...DESPITE
RATHER MARGINAL INSTABILITY.  THE RECENT STRONG TO SEVERE STORMS IN
CENTRAL IND HAVE DEVELOPED WITHIN A STEEP LAPSE RATE ENVIRONMENT
/BOTH AT LOW AND MID LEVELS/.  THUS...GIVEN CONTINUED COLD ADVECTION
AT MIDLEVELS /-26 C AT 500 MB/ AND EFFECTIVE BULK SHEAR 40-50
KT...HAIL SHOULD REMAIN THE PRIMARY THREAT...ESPECIALLY WITH
SUPERCELLS.

..PETERS.. 03/23/2011

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

ATTN...WFO...ILN...IWX...IND...

LAT...LON   40138730 40398652 40408512 40308449 39738453 39378498
            39568619 39638729 40138730

SPC that day

Everything else SPC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Mar 23, 12:02 PM EDT	Mesoscale Discussion	SPC	Bartholomew, Brown, Clark, Crawford, Dearborn, Decatur and 25 more	88 min
Mar 23, 1:12 PM EDT	Mesoscale Discussion	SPC	Allen, DeKalb, Elkhart, Fulton, Huntington, Kosciusko and 6 more	93 min
Mar 23, 1:13 PM EDT	Tornado Watch	SPC	Bartholomew, Clark, Crawford, Dearborn, Decatur, Dubois and 24 more	7 hr
Mar 23, 4:20 PM EDT	Mesoscale Discussion	SPC	Benton, Blackford, Boone, Carroll, Cass, Clinton and 25 more	85 min
Mar 23, 3:54 PM EDT	Mesoscale Discussion	SPC	Adams, Athens, Belmont, Brown, Carroll, Clark and 38 more	96 min

Nearby

Mesoscale Discussions in Indiana, 2011 Mesoscale Discussions in Ohio, 2011 Every mesoscale discussion in 2011

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.