Alert archive / Indiana / Mesoscale Discussions in 2011

Mesoscale Discussion 596

April 26, 201119 counties in Indiana; 13 counties in Michigan

The Storm Prediction Center issued this mesoscale discussion at Apr 26, 2011, 4:53 PM EDT for 19 counties in Indiana; 13 counties in Michigan. It was in force for 67 min.

The area

The outline as issued.

The facts

Issued: Apr 26, 2011, 4:53 PM EDT (20:53 UTC)
Expired: Apr 26, 2011, 6:00 PM EDT
In force: 67 min
Issued by: the Storm Prediction Center

All 32 counties

Carroll County, IN, Cass County, IN, Elkhart County, IN, Fulton County, IN, Howard County, IN, Jasper County, IN, Kosciusko County, IN, LaGrange County, IN, LaPorte County, IN, Marshall County, IN, Miami County, IN, Noble County, IN, Pulaski County, IN, Saint Joseph County, IN, Starke County, IN, Tippecanoe County, IN, Wabash County, IN, White County, IN, Whitley County, IN, Allegan County, MI, Barry County, MI, Berrien County, MI, Branch County, MI, Calhoun County, MI, Cass County, MI, Clinton County, MI, Eaton County, MI, Ionia County, MI, Kalamazoo County, MI, Kent County, MI, Saint Joseph County, MI, Van Buren County, MI

The radar

The Northern Indiana radar (KIWX), 51 km from the middle of the area, began a volume at 20:56 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, 8.9 hours before the alert went out and 210 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: 547 m above ground
0-6 km bulk shear: 54 kt
0-1 km storm-relative helicity: 687 m²/s²
0-3 km storm-relative helicity: 744 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.4

Open this sounding in Storm Lab

The text

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

626 
ACUS11 KWNS 262053
SWOMCD
SPC MCD 262053 
MIZ000-INZ000-262200-

MESOSCALE DISCUSSION 0596
NWS STORM PREDICTION CENTER NORMAN OK
0353 PM CDT TUE APR 26 2011

AREAS AFFECTED...NRN IND...SRN LOWER MI

CONCERNING...TORNADO WATCH 216...

VALID 262053Z - 262200Z

THE SEVERE WEATHER THREAT FOR TORNADO WATCH 216 CONTINUES.

AT LEAST AN ISOLATED SEVERE THREAT SHOULD COMMENCE BY 22Z WITHIN AN
AXIS OF PERSISTENT ISOLATED TSTM ACTIVITY STRETCHING FROM NEAR THE
LK MI SHORE IN SWRN MI SWD INTO NWRN IND. HEATING CONTINUES
DOWNSTREAM OF THIS AXIS WHICH WILL RESULT IN FURTHER DESTABILIZATION
/ALBEIT REMAINING WEAK/. LOW/MID-LEVEL SHEAR WILL REMAIN QUITE
STRONG WITH 0-1 KM SRH AROUND 200-300 M2/S2 AS SAMPLED BY WOLCOTT
IND PROFILER AND AREA VWP DATA. AS SUCH...PROPENSITY FOR LOW-LEVEL
ROTATION WILL EXIST WITH ANY SUSTAINED CELL WITH ATTENDANT THREATS
FOR AN ISOLATED TORNADO/HAIL. GIVEN THE CONTINUED NEWD PIVOTING OF
THE WRN GREAT LAKES SHORT WAVE TROUGH...CU FIELD HAS STRUGGLED TO
INCREASE SWWD OF ONGOING ACTIVITY IN NWRN IND. IF THIS TREND
PERSISTS...ANY SEVERE THREAT APPEARS HIGHLY CONDITIONAL ACROSS
PORTIONS OF E-CNTRL IL INTO CNTRL IND.

..GRAMS.. 04/26/2011

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

ATTN...WFO...DTX...IWX...GRR...IND...LOT...

LAT...LON   41778494 40478577 40278665 40418730 41078720 42248654
            43188547 43178490 42978441 42708434 41778494

SPC that day

Everything else SPC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Apr 25, 8:34 PM EDT	Mesoscale Discussion	SPC	Posey	116 min
Apr 26, 12:05 AM EDT	Mesoscale Discussion	SPC	Posey, Vanderburgh	115 min
Apr 26, 1:26 PM EDT	Mesoscale Discussion	SPC	Adams, Allen, Bartholomew, Benton, Blackford, Boone and 61 more	94 min
Apr 26, 3:02 PM EDT	Tornado Watch	SPC	Adams, Allen, Benton, Blackford, Boone, Carroll and 44 more	7 hr
Apr 26, 5:38 PM EDT	Mesoscale Discussion	SPC	Bartholomew, Brown, Clark, Clay, Crawford, Daviess and 29 more	37 min
Apr 26, 5:50 PM EDT	Tornado Watch	SPC	Bartholomew, Brown, Clark, Clay, Crawford, Daviess and 28 more	5 hr

Nearby

Mesoscale Discussions in Indiana, 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.