Alert archive / Indiana / Mesoscale Discussions in 2011

Mesoscale Discussion 974

May 26, 201115 counties in Indiana; Mercer County, Van Wert County, Ohio

The Storm Prediction Center issued this mesoscale discussion at May 26, 2011, 12:23 AM EDT for 15 counties in Indiana; Mercer County, Van Wert County, Ohio. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued: May 26, 2011, 12:23 AM EDT (04:23 UTC)
Expired: May 26, 2011, 2:30 AM EDT
In force: 2 hr
Issued by: the Storm Prediction Center

Counties Adams County, IN, Blackford County, IN, Delaware County, IN, Fayette County, IN, Franklin County, IN, Grant County, IN, Henry County, IN, Huntington County, IN, Jay County, IN, Jefferson County, IN, Randolph County, IN, Ripley County, IN, Wabash County, IN, Wayne County, IN, Wells County, IN, Mercer County, OH, Van Wert County, OH

The radar

The Indianapolis radar (KIND), 101 km from the middle of the area, began a volume at 04:24 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 00:00Z, 4.4 hours before the alert went out and 128 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: 1430 J/kg
Mixed-layer CIN: -6 J/kg
Mixed-layer LCL: 1362 m above ground
0-6 km bulk shear: 51 kt
0-1 km storm-relative helicity: 148 m²/s²
0-3 km storm-relative helicity: 201 m²/s²
Significant tornado parameter: 0.8
Supercell composite: 8.2

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

052 
ACUS11 KWNS 260423
SWOMCD
SPC MCD 260423 
OHZ000-INZ000-KYZ000-260630-

MESOSCALE DISCUSSION 0974
NWS STORM PREDICTION CENTER NORMAN OK
1123 PM CDT WED MAY 25 2011

AREAS AFFECTED...NERN MS/NRN AL NWD INTO IND/OH

CONCERNING...TORNADO WATCH 375...376...

VALID 260423Z - 260630Z

THE SEVERE WEATHER THREAT FOR TORNADO WATCH 375...376...CONTINUES.

STORM MODE HAS BECOME DECIDEDLY LINEAR OVER THE PAST FEW HOURS AS
STORMS TRAVEL EWD THIS EVENING...RESULTING IN PRIMARILY A WIND
THREAT. 00Z SOUNDINGS ACROSS THE REGION INDICATE CAPPING AROUND 700
MB WILL LIKELY LEAD TO SOME DECREASE IN ACTIVITY WITH TIME.
ALSO...MUCH LOWER BOUNDARY LAYER MOISTURE AND INSTABILITY EXISTS E
OF THE LINE...AND THIS WILL LIKELY RESULT IN OUTFLOW EVENTUALLY
UNDERCUTTING THE STORMS AND A LESSENING OF SEVERITY.
HOWEVER...DAMAGING WIND GUSTS AND SOME HAIL WILL REMAIN POSSIBLE
OVER OH AND KY DUE TO ESTABLISHED ADVANCING COLD POOL...AND PERHAPS
FARTHER S INTO MS IN CLOSER PROXIMITY TO BETTER INSTABILITY.

..JEWELL.. 05/26/2011

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

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

LAT...LON   40908442 38738528 38748548 39448537 40928586 40908442

SPC that day

Everything else SPC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
May 25, 8:14 PM EDT	Mesoscale Discussion	SPC	Dearborn, Ohio, Switzerland	2 hr
May 25, 8:40 PM EDT	Mesoscale Discussion	SPC	Bartholomew, Boone, Brown, Clark, Clay, Clinton and 42 more	2 hr
May 25, 9:33 PM EDT	Tornado Watch	SPC	Clark, Crawford, Dearborn, Dubois, Fayette, Floyd and 14 more	7 hr
May 26, 2:37 AM EDT	Mesoscale Discussion	SPC	Ashland, Ashtabula, Carroll, Columbiana, Coshocton, Crawford and 27 more	83 min
May 26, 3:09 PM EDT	Mesoscale Discussion	SPC	Adams, Brown, Champaign, Clark, Clermont, Clinton and 19 more	96 min
May 26, 6:06 PM EDT	Severe Thunderstorm Watch	SPC	Ashtabula, Belmont, Carroll, Columbiana, Coshocton, Cuyahoga and 17 more	6 hr

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.