Alert archive / Ohio / Mesoscale Discussions in 2014

Mesoscale Discussion 1713

September 10, 201422 counties in Indiana; 27 counties in Ohio

The Storm Prediction Center issued this mesoscale discussion at Sep 10, 2014, 8:51 PM EDT for 22 counties in Indiana; 27 counties in Ohio. It was in force for 54 min.

The area

The outline as issued.

The facts

Issued: Sep 10, 2014, 8:51 PM EDT (00:51 UTC)
Expired: Sep 10, 2014, 9:45 PM EDT
In force: 54 min
Issued by: the Storm Prediction Center

All 49 counties

Brown County, IN, Clay County, IN, Delaware County, IN, Fayette County, IN, Greene County, IN, Hamilton County, IN, Hancock County, IN, Hendricks County, IN, Henry County, IN, Jay County, IN, Johnson County, IN, Madison County, IN, Marion County, IN, Monroe County, IN, Morgan County, IN, Owen County, IN, Randolph County, IN, Rush County, IN, Shelby County, IN, Sullivan County, IN, Union County, IN, Wayne County, IN, Allen County, OH, Ashland County, OH, Auglaize County, OH, Champaign County, OH, Crawford County, OH, Cuyahoga County, OH, Darke County, OH, Delaware County, OH, Erie County, OH, Hardin County, OH, Huron County, OH, Knox County, OH, Logan County, OH, Lorain County, OH, Marion County, OH, Medina County, OH, Mercer County, OH, Miami County, OH, Morrow County, OH, Preble County, OH, Richland County, OH, Seneca County, OH, Shelby County, OH, Summit County, OH, Union County, OH, Wayne County, OH, Wyandot County, OH

The radar

The Cincinnati radar (KILN), 139 km from the middle of the area, began a volume at 00:51 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

Cncnati-Daytn, OH (KILN), launched 00:00Z, 0.9 hours before the alert went out and 137 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: 167 J/kg
Mixed-layer CIN: -20 J/kg
Mixed-layer LCL: 949 m above ground
0-6 km bulk shear: 39 kt
0-1 km storm-relative helicity: 316 m²/s²
0-3 km storm-relative helicity: 419 m²/s²
Significant tornado parameter: 0.2
Supercell composite: 1.0

Open this sounding in Storm Lab

The text

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

901 
ACUS11 KWNS 110052
SWOMCD
SPC MCD 110051 
OHZ000-INZ000-110145-

MESOSCALE DISCUSSION 1713
NWS STORM PREDICTION CENTER NORMAN OK
0751 PM CDT WED SEP 10 2014

AREAS AFFECTED...NRN OH INTO CENTRAL INDIANA

CONCERNING...TORNADO WATCH 501...

VALID 110051Z - 110145Z

THE SEVERE WEATHER THREAT FOR TORNADO WATCH 501 CONTINUES.

SUMMARY...MARGINAL DAMAGING WIND/TORNADO RISK MAY CONTINUE FOR A FEW
HOURS THROUGH LATE EVENING. WATCH 501 WILL BE ALLOWED TO EXPIRE AT
01Z IN OH...BUT MAY NEED LOCAL EXTENSION IN INDIANA.

DISCUSSION...CONVECTION PERSISTS IN A MOIST/WEAKLY UNSTABLE
ENVIRONMENT WITH SUBSTANTIAL LOW-LEVEL SHEAR...PER 00Z SOUNDINGS. 
THE LOSS OF DAYTIME HEATING WILL RESULT IN A GRADUAL REDUCTION IN
ALREADY MARGINAL BUOYANCY...THOUGH WIND PROFILES WILL REMAIN
FAVORABLE FOR STORM-SCALE ROTATION.  THUS...SOME RISK FOR ISOLATED
DAMAGING GUSTS AND PERHAPS A TORNADO WILL CONTINUE...THOUGH THE
OVERALL SEVERE RISK APPEARS TO BE MARGINAL FOR THE CONTINUATION OF A
TORNADO WATCH IN OH.  THE SOMEWHAT STRONGER BUOYANCY EXISTS FROM SRN
IL INTO INDIANA...WHERE A LOCAL EXTENSION OF THE WATCH MAY BE
NEEDED.

..THOMPSON/HART.. 09/11/2014

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

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

LAT...LON   41388130 40818165 40598187 40338251 40188315 39088643
            39018740 39358750 40258565 40698463 40988344 41218302
            41648236 41718165 41618144 41388130

SPC that day

Everything else SPC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Sep 11, 12:44 AM EDT	Mesoscale Discussion	SPC	Adams, Brown, Clermont, Hamilton, Highland, Pike and 1 more	61 min

Nearby

Mesoscale Discussions in Ohio, 2014 Mesoscale Discussions in Indiana, 2014 Every mesoscale discussion in 2014

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.