Alert archive / Indiana / Mesoscale Discussions in 2012

Mesoscale Discussion 340

March 23, 2012Ford County, Iroquois County, Kankakee County, Illinois; 7 counties in Indiana

The Storm Prediction Center issued this mesoscale discussion at Mar 23, 2012, 7:01 PM CDT for Ford County, Iroquois County, Kankakee County, Illinois; 7 counties in Indiana. It was in force for 59 min.

The area

The outline as issued.

The facts

Issued
Mar 23, 2012, 7:01 PM CDT (00:01 UTC)
Expired
Mar 23, 2012, 8:00 PM CDT
In force
59 min
Issued by
the Storm Prediction Center

Counties Ford County, IL, Iroquois County, IL, Kankakee County, IL, Benton County, IN, Carroll County, IN, Cass County, IN, Jasper County, IN, Newton County, IN, Pulaski County, IN, White County, IN

The radar

The Chicago radar (KLOT), 113 km from the middle of the area, began a volume at 00:03 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

Lincoln, IL (KILX), launched 00:00Z, 0.0 hours before the alert went out and 151 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, Lincoln, IL at 00:00Z on 2012-03-24Temperature 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, Lincoln, IL at 00:00Z on 2012-03-24The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 21 square meters per square second.19395878Sfc1 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
1697 m above ground
0-6 km bulk shear
30 kt
0-1 km storm-relative helicity
21 m²/s²
0-3 km storm-relative helicity
51 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.

085 
ACUS11 KWNS 240001
SWOMCD
SPC MCD 240001 
INZ000-ILZ000-240100-

MESOSCALE DISCUSSION 0340
NWS STORM PREDICTION CENTER NORMAN OK
0701 PM CDT FRI MAR 23 2012

AREAS AFFECTED...NERN IL AND NWRN IND

CONCERNING...SEVERE THUNDERSTORM WATCH 102...

VALID 240001Z - 240100Z

THE SEVERE WEATHER THREAT FOR SEVERE THUNDERSTORM WATCH 102
CONTINUES.

HOWEVER...TRENDS IN REGIONAL RADAR DATA INCLUDING CAPPI INDICATED A
CONTINUED WEAKENING TREND WITH CONVECTIVE ACTIVITY MOVING NWD
THROUGH NWRN IND AND ADJACENT NERN IL.  DIMINISHING INSTABILITY AND
A CONVECTIVELY OVERTURNED AIR MASS ACROSS THIS PORTION OF WW 102
SUGGEST ANY ADDITIONAL SEVERE WEATHER THREAT WILL BE QUITE LOW. 
THUS...THIS WATCH MAY BE CANCELLED PRIOR TO 24/02Z.

..PETERS.. 03/24/2012

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

ATTN...WFO...IWX...IND...LOT...ILX...

LAT...LON   40638615 40428736 40488834 41188829 41338794 41318714
            41168648 40958615 40638615

SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Mar 23, 8:06 PM CDTMesoscale DiscussionSPCBartholomew, Brown, Clark, Dearborn, Decatur, Delaware and 24 more54 min
Mar 23, 10:16 PM CDTMesoscale DiscussionSPCBartholomew, Blackford, Brown, Clark, Dearborn, Decatur and 27 more89 min

Nearby

Mesoscale Discussions in Indiana, 2012Mesoscale Discussions in Illinois, 2012Every 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.