Alert archive / Indiana / Mesoscale Discussions in 2011

Mesoscale Discussion 906

May 23, 201114 counties in Indiana; 10 counties in Michigan; 13 counties in Ohio

The Storm Prediction Center issued this mesoscale discussion at May 23, 2011, 6:40 PM EDT for 14 counties in Indiana; 10 counties in Michigan; 13 counties in Ohio. It was in force for 65 min.

The area

The outline as issued.

The facts

Issued: May 23, 2011, 6:40 PM EDT (22:40 UTC)
Expired: May 23, 2011, 7:45 PM EDT
In force: 65 min
Issued by: the Storm Prediction Center

All 37 counties

Adams County, IN, Allen County, IN, Blackford County, IN, DeKalb County, IN, Grant County, IN, Howard County, IN, Huntington County, IN, Jay County, IN, Miami County, IN, Noble County, IN, Steuben County, IN, Wabash County, IN, Wells County, IN, Whitley County, IN, Hillsdale County, MI, Jackson County, MI, Lenawee County, MI, Livingston County, MI, Macomb County, MI, Monroe County, MI, Oakland County, MI, Saint Clair County, MI, Washtenaw County, MI, Wayne County, MI, Allen County, OH, Auglaize County, OH, Defiance County, OH, Fulton County, OH, Hancock County, OH, Henry County, OH, Lucas County, OH, Mercer County, OH, Paulding County, OH, Putnam County, OH, Van Wert County, OH, Williams County, OH, Wood County, OH

The radar

The Detroit radar (KDTX), 86 km from the middle of the area, began a volume at 22:43 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

Detroit, MI (KDTX), launched 12:00Z, 10.7 hours before the alert went out and 90 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: 181 J/kg
Mixed-layer CIN: -79 J/kg
Mixed-layer LCL: 746 m above ground
0-6 km bulk shear: 33 kt
0-1 km storm-relative helicity: 121 m²/s²
0-3 km storm-relative helicity: 135 m²/s²
Significant tornado parameter: 0.1
Supercell composite: 0.5

Open this sounding in Storm Lab

The text

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

835 
ACUS11 KWNS 232240
SWOMCD
SPC MCD 232240 
MIZ000-OHZ000-INZ000-232345-

MESOSCALE DISCUSSION 0906
NWS STORM PREDICTION CENTER NORMAN OK
0540 PM CDT MON MAY 23 2011

AREAS AFFECTED...SERN LWR MI...NERN IND...NWRN OH

CONCERNING...SEVERE THUNDERSTORM WATCH 342...

VALID 232240Z - 232345Z

THE SEVERE WEATHER THREAT FOR SEVERE THUNDERSTORM WATCH 342
CONTINUES.

CLUSTERS OF STORMS CONTINUE TO FORM ALONG THE SRN PERIPHERY OF GRT
LKS UPPER TROUGH...WHERE 50 KT MIDLEVEL WLY JET RESIDES. IN THE
SHORT TERM...COMBINATION OF STRONG UNIDIRECTIONAL DEEP LAYER FLOW
/CHARACTERIZED BY 0-6 KM BULK SHEAR AROUND 50KT/ AND MLCAPE VALUES
NEAR 1000 J/KG WILL CONTINUE TO FAVOR FAST MOVING STORM CLUSTERS AND
LINE SEGMENTS POSING A THREAT FOR LARGE HAIL/DAMAGING WIND GUSTS.
TOWARD EVENING...BOUNDARY LAYER IS FORECAST TO COOL AND ALSO
STABILIZE AS DRIER AIR ENTERS THE REGION FROM THE W...WHICH WILL
REDUCE THE SVR WEATHER THREAT FOR WW 342. THUS...02Z EXPIRATION
APPEARS TO BE ON TRACK.

..GARNER.. 05/23/2011

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

ATTN...WFO...CLE...ILN...DTX...IWX...GRR...IND...

LAT...LON   43068358 43068135 40318439 40328666 42398449 43068358

SPC that day

Everything else SPC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
May 22, 8:20 PM EDT	Mesoscale Discussion	SPC	Adams, Allen, Benton, Blackford, Boone, Carroll and 33 more	115 min
May 22, 10:35 PM EDT	Mesoscale Discussion	SPC	Lake	55 min
May 22, 10:59 PM EDT	Mesoscale Discussion	SPC	Allen, Carroll, Cass, DeKalb, Elkhart, Fulton and 14 more	61 min
May 22, 11:24 PM EDT	Mesoscale Discussion	SPC	Vermillion, Vigo	66 min
May 23, 4:20 AM EDT	Mesoscale Discussion	SPC	Clark, Floyd, Harrison, Jefferson, Ohio, Scott and 1 more	85 min
May 23, 8:25 AM EDT	Mesoscale Discussion	SPC	Adams, Allen, Blackford, Boone, Carroll, Cass and 36 more	65 min
May 23, 11:55 AM EDT	Severe Thunderstorm Watch	SPC	Gibson, Pike, Posey, Spencer, Vanderburgh, Warrick	7 hr
May 23, 12:35 PM EDT	Mesoscale Discussion	SPC	Adams, Allen, Blackford, Cass, DeKalb, Elkhart and 13 more	85 min
May 23, 1:37 PM EDT	Mesoscale Discussion	SPC	Clay, Daviess, Gibson, Greene, Knox, Pike and 6 more	83 min
May 23, 1:54 PM EDT	Severe Thunderstorm Watch	SPC	Bartholomew, Boone, Brown, Carroll, Clay, Clinton and 33 more	5 hr
May 23, 2:15 PM EDT	Severe Thunderstorm Watch	SPC	Adams, Allen, Blackford, Cass, DeKalb, Elkhart and 15 more	8 hr
May 23, 3:52 PM EDT	Mesoscale Discussion	SPC	Bartholomew, Brown, Clark, Clay, Crawford, Daviess and 42 more	53 min
May 23, 4:28 PM EDT	Severe Thunderstorm Watch	SPC	Clark, Crawford, Dearborn, Dubois, Fayette, Floyd and 12 more	6 hr
May 23, 4:58 PM EDT	Mesoscale Discussion	SPC	Gibson, Pike, Posey, Spencer, Vanderburgh, Warrick	92 min
May 23, 6:20 PM EDT	Mesoscale Discussion	SPC	Clark, Crawford, Dearborn, Decatur, Fayette, Floyd and 15 more	55 min
May 22, 8:09 PM EDT	Mesoscale Discussion	SPC	Antrim, Crawford, Grand Traverse, Kalkaska, Lake, Missaukee and 3 more	96 min
May 22, 8:42 PM EDT	Mesoscale Discussion	SPC	Dickinson, Iron	63 min
May 23, 7:20 PM EDT	Mesoscale Discussion	SPC	Athens, Belmont, Coshocton, Gallia, Guernsey, Harrison and 15 more	85 min

Nearby

Mesoscale Discussions in Indiana, 2011 Mesoscale Discussions in Ohio, 2011 Mesoscale Discussions in Michigan, 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.