Alert archive / Indiana / Mesoscale Discussions in 2012
Mesoscale Discussion 34
The Storm Prediction Center issued this mesoscale discussion at Jan 20, 2012, 5:32 PM CST for 5 states. It was in force for 5 hr.
The area
The outline as issued.
The facts
- Issued
- Jan 20, 2012, 5:32 PM CST (23:32 UTC)
- Expired
- Jan 20, 2012, 10:30 PM CST
- In force
- 5 hr
- Issued by
- the Storm Prediction Center
All 126 counties
Bond County, IL, Clark County, IL, Clay County, IL, Clinton County, IL, Coles County, IL, Crawford County, IL, Cumberland County, IL, Edgar County, IL, Edwards County, IL, Effingham County, IL, Fayette County, IL, Franklin County, IL, Hamilton County, IL, Jasper County, IL, Jefferson County, IL, Lawrence County, IL, Marion County, IL, Moultrie County, IL, Perry County, IL, Richland County, IL, Shelby County, IL, Wabash County, IL, Washington County, IL, Wayne County, IL, White County, IL, Bartholomew County, IN, Brown County, IN, Clark County, IN, Clay 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, Hamilton County, IN, Hancock County, IN, Hendricks 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, Parke County, IN, Pike County, IN, Putnam County, IN, Randolph County, IN, Ripley County, IN, Rush County, IN, Scott County, IN, Shelby County, IN, Sullivan County, IN, Switzerland County, IN, Union County, IN, Vigo County, IN, Washington County, IN, Wayne County, IN, Boone County, KY, Bracken County, KY, Campbell County, KY, Carroll County, KY, Gallatin County, KY, Grant County, KY, Harrison County, KY, Henry County, KY, Kenton County, KY, Mason County, KY, Oldham County, KY, Owen County, KY, Pendleton County, KY, Robertson County, KY, Trimble County, KY, Adams County, OH, Athens County, OH, Brown County, OH, Butler County, OH, Champaign County, OH, Clark County, OH, Clermont County, OH, Clinton County, OH, Coshocton County, OH, Darke County, OH, Delaware County, OH, Fairfield County, OH, Fayette County, OH, Franklin County, OH, Greene County, OH, Guernsey County, OH, Hamilton County, OH, Highland County, OH, Hocking County, OH, Jackson County, OH, Licking County, OH, Madison County, OH, Meigs County, OH, Miami County, OH, Monroe County, OH, Montgomery County, OH, Morgan County, OH, Muskingum County, OH, Noble County, OH, Perry County, OH, Pickaway County, OH, Pike County, OH, Preble County, OH, Ross County, OH, Scioto County, OH, Shelby County, OH, Union County, OH, Vinton County, OH, Warren County, OH, Washington County, OH, Wood County, WV
The radar
The Cincinnati radar (KILN), 63 km from the middle of the area, began a volume at 23:33 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 12:00Z, 11.5 hours before the alert went out and 65 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.
- Mixed-layer CAPE
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 1655 m above ground
- 0-6 km bulk shear
- 87 kt
- 0-1 km storm-relative helicity
- 220 m²/s²
- 0-3 km storm-relative helicity
- 490 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
914
ACUS11 KWNS 202333
SWOMCD
SPC MCD 202332
OHZ000-WVZ000-KYZ000-INZ000-ILZ000-210430-
MESOSCALE DISCUSSION 0034
NWS STORM PREDICTION CENTER NORMAN OK
0532 PM CST FRI JAN 20 2012
AREAS AFFECTED...PORTIONS OF SRN/CNTRL IL...SRN/CNTRL IND...FAR NRN
KY...SRN/CNTRL OH
CONCERNING...FREEZING RAIN
VALID 202332Z - 210430Z
FREEZING RAIN WITH RATES AOA 0.02 IN/HR IS FORECAST TO OCCUR TONIGHT
FROM PORTIONS OF SRN/CNTRL IL EWD INTO SRN/CNTRL IND/IL AND POSSIBLY
FAR NRN KY.
COMPOSITE RADAR IMAGERY AT 23Z SHOWS THE INITIAL STAGES OF SHOWER
DEVELOPMENT TAKING PLACE FROM SRN IL EWD INTO NRN/ERN KY. THIS
ACTIVITY IS FOCUSED WITHIN THE EXIT REGION OF A 30+ KT SWLY
LLJ...WHICH IS AIDING IN A BROAD WAA REGIME. MEANWHILE...SURFACE
OBSERVATIONS INDICATE THE FREEZING LINE IS LOCATED ROUGHLY PARALLEL
TO THE OH RIVER...AND THEN EXTENDS WWD ACROSS SRN IL. HOWEVER...WET
BULB COOLING WILL LEAD TO SUBFREEZING TEMPERATURES OVER SRN IL IF
HEAVY SHOWER ACTIVITY DEVELOPS. ABOVE THE SURFACE...RUC/NAM FORECAST
SOUNDINGS SHOW A 2-3 DEG C WARM NOSE CENTERED NEAR 850 MB...WHICH
WILL BE MAINTAINED THROUGH THE NIGHT AS THE AXIS OF THE LLJ SHIFTS
E-NEWD ACROSS THE REGION. GIVEN THE SHALLOW SUB-FREEZING AIRMASS
JUXTAPOSED BENEATH THE ELEVATED WARM NOSE...FREEZING RAIN WILL BE
PROBABLE...PRIMARILY FOR LOCATIONS ALONG AND N OF THE OH RIVER.
MULTI-MODEL CONSENSUS SUGGESTS FREEZING RAIN WILL BEGIN TO DEVELOP
DURING THE 00-03Z PERIOD...PEAKING BY 06Z /MAINLY OVER SRN AND CNTRL
IND AND OH/...AND THEN DIMINISHING IN INTENSITY BY 09Z.
..GARNER.. 01/20/2012
...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT...
ATTN...WFO...PBZ...RLX...CLE...JKL...ILN...LMK...IND...PAH...
ILX...LSX...
LAT...LON 40378149 39908081 39258132 38528351 37898925 38738992
39628880 40348437 40378149Nearby
Mesoscale Discussions in Indiana, 2012Mesoscale Discussions in Ohio, 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.