Alert archive / Ohio / Mesoscale Discussions in 2012

Mesoscale Discussion 1706

August 5, 201211 counties in Ohio

The Storm Prediction Center issued this mesoscale discussion at Aug 5, 2012, 7:57 AM EDT for 11 counties in Ohio. It was in force for 63 min.

The area

The outline as issued.

The facts

Issued: Aug 5, 2012, 7:57 AM EDT (11:57 UTC)
Expired: Aug 5, 2012, 9:00 AM EDT
In force: 63 min
Issued by: the Storm Prediction Center

Counties Champaign County, OH, Clark County, OH, Clinton County, OH, Delaware County, OH, Fayette County, OH, Franklin County, OH, Greene County, OH, Hardin County, OH, Madison County, OH, Marion County, OH, Union County, OH

The radar

The Cincinnati radar (KILN), 56 km from the middle of the area, began a volume at 11:59 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, 12.0 hours before the alert went out and 55 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: 3062 J/kg
Mixed-layer CIN: -5 J/kg
Mixed-layer LCL: 842 m above ground
0-6 km bulk shear: 18 kt
0-1 km storm-relative helicity: 124 m²/s²
0-3 km storm-relative helicity: 135 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.

734 
ACUS11 KWNS 051158
SWOMCD
SPC MCD 051157
OHZ000-051300-

MESOSCALE DISCUSSION 1706
NWS STORM PREDICTION CENTER NORMAN OK
0657 AM CDT SUN AUG 05 2012

AREAS AFFECTED...WRN THROUGH CNTRL OH

CONCERNING...SEVERE THUNDERSTORM WATCH 562...

VALID 051157Z - 051300Z

THE SEVERE WEATHER THREAT FOR SEVERE THUNDERSTORM WATCH 562
CONTINUES.

SUMMARY...THOUGH AN ISOLATED STRONG WIND GUST OR TWO REMAINS
POSSIBLE OVER WRN OH NEXT HOUR...OVERALL SEVERE THREAT IS BECOMING
INCREASINGLY MARGINAL AND STORMS WILL BEGIN MOVING EAST OF WW 562 BY
13Z. ANOTHER WW IS NOT EXPECTED AT THIS TIME.

DISCUSSION...STORMS CONTINUE MOVING THROUGH WRN OH AT 35-40 KT AND
RETAIN SOME ORGANIZATIONAL STRUCTURE INCLUDING COMMA HEAD WITH
TRAILING LINE SEGMENTS. HOWEVER...INTENSITIES HAVE DECREASED
SIGNIFICANTLY...MOST LIKELY DUE TO MARGINAL INSTABILITY. THE
INCOMING VISIBLE IMAGERY SHOWS WIDESPREAD CLOUDS AND ELEVATED STORMS
DEVELOPING ALONG WARM CONVEYOR BELT AND WITHIN SUBTROPICAL MOISTURE
PLUME WHICH SHOULD LIMIT DOWNSTREAM DESTABILIZATION AND
REINTENSIFICATION POTENTIAL NEXT FEW HOURS.

..DIAL/WEISS.. 08/05/2012

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

ATTN...WFO...CLE...ILN...

LAT...LON   39238438 39678390 40308376 40708374 40738301 40158277
            39318352 39238438

SPC that day

Everything else SPC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Aug 4, 10:46 PM EDT	Mesoscale Discussion	SPC	Ashland, Ashtabula, Carroll, Champaign, Clark, Columbiana and 35 more	119 min
Aug 5, 4:57 AM EDT	Mesoscale Discussion	SPC	Auglaize, Butler, Champaign, Clark, Clinton, Darke and 12 more	2 hr
Aug 5, 5:29 AM EDT	Severe Thunderstorm Watch	SPC	Auglaize, Butler, Champaign, Clark, Clinton, Darke and 9 more	3 hr

Nearby

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.