Alert archive / Indiana / Mesoscale Discussions in 2011

Mesoscale Discussion 342

April 4, 20114 states

The Storm Prediction Center issued this mesoscale discussion at Apr 4, 2011, 6:53 AM CDT for 4 states. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued
Apr 4, 2011, 6:53 AM CDT (11:53 UTC)
Expired
Apr 4, 2011, 9:00 AM CDT
In force
2 hr
Issued by
the Storm Prediction Center
All 115 counties

Hardin County, IL, Lawrence County, IL, Wabash County, IL, Bartholomew County, IN, Brown County, IN, Clark County, IN, Crawford County, IN, Daviess County, IN, Dearborn County, IN, Decatur County, IN, Dubois County, IN, Fayette County, IN, Floyd County, IN, Franklin County, IN, Gibson County, IN, Greene County, IN, Hancock County, IN, Harrison County, IN, Henry County, IN, Jackson County, IN, Jefferson County, IN, Jennings County, IN, Johnson County, IN, Knox County, IN, Lawrence County, IN, Marion County, IN, Martin County, IN, Monroe County, IN, Morgan County, IN, Ohio County, IN, Orange County, IN, Owen County, IN, Perry County, IN, Pike County, IN, Posey County, IN, Randolph County, IN, Ripley County, IN, Rush County, IN, Scott County, IN, Shelby County, IN, Spencer County, IN, Sullivan County, IN, Switzerland County, IN, Union County, IN, Vanderburgh County, IN, Warrick County, IN, Washington County, IN, Wayne County, IN, Boone County, KY, Breckinridge County, KY, Caldwell County, KY, Carroll County, KY, Crittenden County, KY, Daviess County, KY, Graves County, KY, Hancock County, KY, Henderson County, KY, Hopkins County, KY, Jefferson County, KY, Livingston County, KY, Lyon County, KY, Marshall County, KY, McLean County, KY, Meade County, KY, Muhlenberg County, KY, Ohio County, KY, Oldham County, KY, Trimble County, KY, Union County, KY, Webster County, KY, Ashland County, OH, Ashtabula County, OH, Auglaize County, OH, Butler County, OH, Champaign County, OH, Clark County, OH, Clinton County, OH, Crawford County, OH, Cuyahoga County, OH, Darke County, OH, Delaware County, OH, Erie County, OH, Fayette County, OH, Franklin County, OH, Geauga County, OH, Greene County, OH, Hamilton County, OH, Hancock County, OH, Hardin County, OH, Holmes County, OH, Huron County, OH, Knox County, OH, Lake County, OH, Licking County, OH, Logan County, OH, Lorain County, OH, Madison County, OH, Marion County, OH, Medina County, OH, Miami County, OH, Montgomery County, OH, Morrow County, OH, Ottawa County, OH, Portage County, OH, Preble County, OH, Richland County, OH, Sandusky County, OH, Seneca County, OH, Shelby County, OH, Stark County, OH, Summit County, OH, Union County, OH, Warren County, OH, Wayne County, OH, Wyandot County, OH

The radar

The Cincinnati radar (KILN), 86 km from the middle of the area, began a volume at 11:56 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 watches that followed

Watches SPC issued over any of the same counties within four hours of this discussion.

The nearest sounding before it

Cncnati-Daytn, OH (KILN), launched 00:00Z, 11.9 hours before the alert went out and 85 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-pSkew-T log-p diagram, Cncnati-Daytn, OH at 00:00Z on 2011-04-04Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Cncnati-Daytn, OH at 00:00Z on 2011-04-04The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 429 square meters per square second.1939587897Sfc1 km3 km6 km9 kmRMLM
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
2409 m above ground
0-6 km bulk shear
72 kt
0-1 km storm-relative helicity
429 m²/s²
0-3 km storm-relative helicity
944 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.

440 
ACUS11 KWNS 041154
SWOMCD
SPC MCD 041153
OHZ000-KYZ000-INZ000-ILZ000-041400-

MESOSCALE DISCUSSION 0342
NWS STORM PREDICTION CENTER NORMAN OK
0653 AM CDT MON APR 04 2011

AREAS AFFECTED...PORTIONS WRN/NRN OH...ERN/SRN INDIANA...NRN/WRN
KY...EXTREME SERN IL.

CONCERNING...SEVERE THUNDERSTORM WATCH 88...

VALID 041153Z - 041400Z

THE SEVERE WEATHER THREAT FOR SEVERE THUNDERSTORM WATCH 88
CONTINUES.

PREFRONTAL LINE OF TSTMS CONTINUES TO MOVE ENEWD 50-60 KT ACROSS WW
AREA...AND WILL BE OUT OF EXISTING WW ACROSS PORTIONS NRN OH AND
ADJACENT LE WITHIN 1-2 HOURS.  HOWEVER...NRN PORTION OF CONVECTION
IS OUTRUNNING PACE OF FAVORABLE DESTABILIZATION...MOVING NE OF WARM
FRONT INTO REGIME OF LOWER BOUNDARY-LAYER THETAE.  AS SUCH...SVR
POTENTIAL...WHILE CERTAINLY NON-ZERO...SHOULD CONTINUE TO DIMINISH
IN ACCORDANCE WITH DECREASING ORGANIZATION EVIDENT DURING PAST HOUR
OR SO IN REFLECTIVITY ANIMATIONS.  AS SUCH...ADDITIONAL WW IS NOT
PLANNED FOR OH LAKEFRONT REGION ATTM.

HOWEVER...SEGMENT OF LINE FARTHER SW ACROSS SRN INDIANA WILL REMAIN
SW OF WARM FRONT THROUGH AT LEAST 15Z...MOVING THROUGH AIR MASS
CHARACTERIZED BY SFC DEW POINTS 50S F AND 850-MB DEW POINTS 10-12
C...BEFORE EVENTUALLY OUTRUNNING IDEAL MOISTURE OVER S-CENTRAL/SERN
OH.  MODIFIED RUC SOUNDINGS INDICATE THAT...ESPECIALLY WITH SUBTLE
DIABATIC HEATING EXPECTED TO OCCUR BY MIDMORNING LOCAL
TIME...EFFECTIVE LIFTED PARCELS WILL BE SFC-BASED....AND ARE VERY
NEARLY SO ATTM.  AS SUCH...INFLOW LAYER APPEARS RATHER DEEP...WITH
CONVECTION TAKING FULLEST ADVANTAGE OF NARROW RIBBON OF ROUGHLY 1.25
INCH PW THAT WAS SAMPLED BY NWRN INDIANA GPS SENSOR PRIOR TO PASSAGE
OF CONVECTION.  CAPE VALUES ARE ESTIMATED AT 200-400 J/KG FOR ML
PARCEL AND 500-800 J/KG FOR ELEVATED/MU PARCELS ALOFT...AMIDST
ROUGHLY 50-60 KT EFFECTIVE SHEAR MAGNITUDES.  STRENGTH OF FLOW ALOFT
SHOWN IN VWP AND RUC SOUNDINGS -- E.G. 50-60 KT AT 850 MB AND 60-70
KT IN 700-500 MB LAYER -- INDICATES POTENTIAL FOR HIGH MOMENTUM TO
BE TRANSFERRED TO GROUND IN SUPPORT OF WIND DAMAGE THREAT.

ADDITIONAL TSTMS ALSO MAY FILL IN QUASI-LINEAR FASHION THROUGH LATE
MORNING FARTHER SW...INVOF SFC COLD FRONT.  THEREFORE AREAS BETWEEN
WWS 87-88 ARE BEING MONITORED FOR ADDITIONAL WW COVERAGE.

..EDWARDS.. 04/04/2011

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

ATTN...WFO...PBZ...CLE...ILN...LMK...IWX...IND...PAH...ILX...

LAT...LON   39238748 40428472 41288319 41668296 41398251 41478211
            41498179 41758132 41978052 40548156 39848278 38898472
            37028694 36678879 39238748

SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Apr 3, 7:44 PM CDTMesoscale DiscussionSPCBoone, Bureau, Carroll, Fulton, Hancock, Henderson and 16 more61 min
Apr 3, 8:11 PM CDTSevere Thunderstorm WatchSPCAdams, Brown, Calhoun, Cass, Fulton, Greene and 12 more6 hr
Apr 3, 8:54 PM CDTSevere Thunderstorm WatchSPCBoone, Cook, DeKalb, DuPage, Grundy, Kane and 9 more5 hr
Apr 3, 10:23 PM CDTMesoscale DiscussionSPCBoone, Carroll, Cook, DeKalb, DuPage, Jo Daviess and 10 more67 min
Apr 3, 10:50 PM CDTMesoscale DiscussionSPCAdams, Brown, Cass, Fulton, Hancock, McDonough and 4 more85 min
Apr 4, 1:29 AM CDTMesoscale DiscussionSPCAdams, Bond, Brown, Calhoun, Cass, Christian and 31 more91 min
Apr 4, 1:53 AM CDTMesoscale DiscussionSPCCook, DuPage, Grundy, Kane, Kendall, Lake and 2 more97 min
Apr 4, 4:20 AM CDTMesoscale DiscussionSPCClark, Clay, Crawford, Effingham, Jasper, Lawrence and 2 more25 min
Apr 4, 7:22 AM CDTTornado WatchSPCAlexander, Edwards, Franklin, Gallatin, Hamilton, Hardin and 13 more7 hr
Apr 4, 4:30 AM CDTSevere Thunderstorm WatchSPCAdams, Allen, Bartholomew, Blackford, Boone, Brown and 39 more8 hr
Apr 4, 11:34 AM CDTTornado WatchSPCClark, Crawford, Floyd, Harrison, Jefferson, Orange and 3 more5 hr
Apr 4, 11:50 AM CDTMesoscale DiscussionSPCDearborn, Decatur, Franklin, Jennings, Ohio, Ripley and 1 more25 min
Apr 4, 1:25 PM CDTMesoscale DiscussionSPCAdair, Allen, Anderson, Barren, Bath, Bell and 74 more65 min
Apr 4, 2:05 PM CDTSevere Thunderstorm WatchSPCBath, Bell, Boyd, Breathitt, Carter, Clay and 33 more6 hr
Apr 4, 2:08 PM CDTMesoscale DiscussionSPCAllen, Clinton, Cumberland, McCreary, Monroe, Russell and 2 more67 min
Apr 4, 3:49 PM CDTMesoscale DiscussionSPCBell, Boyd, Breathitt, Carter, Clay, Elliott and 21 more56 min
Apr 4, 5:00 PM CDTMesoscale DiscussionSPCBell, Boyd, Breathitt, Clay, Floyd, Harlan and 12 more90 min
Apr 4, 3:12 PM CDTMesoscale DiscussionSPCAthens, Belmont, Carroll, Columbiana, Coshocton, Guernsey and 12 more63 min

Nearby

Mesoscale Discussions in Indiana, 2011Mesoscale Discussions in Ohio, 2011Mesoscale Discussions in Kentucky, 2011Every 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.