Alert archive / Indiana / Mesoscale Discussions in 2012
Mesoscale Discussion 114
The Storm Prediction Center issued this mesoscale discussion at Feb 10, 2012, 7:53 PM CST for 6 counties in Indiana. It was in force for 4 hr.
The area
The outline as issued.
The facts
- Issued
- Feb 10, 2012, 7:53 PM CST (01:53 UTC)
- Expired
- Feb 11, 2012, 12:00 AM CST
- In force
- 4 hr
- Issued by
- the Storm Prediction Center
Counties Jasper County, IN, Lake County, IN, LaPorte County, IN, Newton County, IN, Porter County, IN, Starke County, IN
The radar
The Chicago radar (KLOT), 92 km from the middle of the area, began a volume at 01:57 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, 1.9 hours before the alert went out and 186 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
- 674 m above ground
- 0-6 km bulk shear
- 66 kt
- 0-1 km storm-relative helicity
- -133 m²/s²
- 0-3 km storm-relative helicity
- 64 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
832
ACUS11 KWNS 110153
SWOMCD
SPC MCD 110153
INZ000-110600-
MESOSCALE DISCUSSION 0114
NWS STORM PREDICTION CENTER NORMAN OK
0753 PM CST FRI FEB 10 2012
AREAS AFFECTED...NWRN IND
CONCERNING...HEAVY SNOW
VALID 110153Z - 110600Z
SNOWFALL RATES OF 1-2 INCHES PER HR /WITH LOCALLY HIGHER RATES/ ARE
FORECAST TO DEVELOP WITHIN A LAKE EFFECT BAND OVER FAR NWRN IND THIS
EVENING AND INTO EARLY SAT MORNING. SUSTAINED SFC WINDS OF 20-30 MPH
COULD ALSO RESULT IN LOCALLY REDUCED VISIBILITIES.
WATER VAPOR LOOP SHOWS A SHARP POSITIVE TILT UPPER TROUGH TRAVERSING
EWD ACROSS THE UPPER GREAT LAKES/MID-MS RIVER VALLEY THIS EVENING.
LOW-LEVEL COLD FRONT HAS MOVED THROUGH PORTIONS OF NRN IND/IL...WITH
POST-FRONTAL NLY WINDS /20-30 KTS IN THE 0-2 KM AGL LAYER PER LOT
VWP DATA/ BECOMING ESTABLISHED IN IT/S WAKE. FAVORABLE N-S
ORIENTATION OF LOW-LEVEL FLOW WILL CREATE A LONG FETCH OFF LAKE
MICHIGAN...WHILE OBSERVATIONS FROM SRN LAKE MICHIGAN INDICATE WATER
TEMPERATURES GENERALLY RANGE FROM 3-4 DEG C...SUPPORTING A NARROW
LAKE EFFECT SNOW BAND ALONG/DOWNWIND OF THE SRN SHORE OF LAKE
MICHIGAN. 0145Z RADAR REFLECTIVITY LOOP SHOWS WEAK BANDED STRUCTURES
ALREADY DEVELOPING OFF SRN LAKE MICHIGAN. RUC/WRF-HRRR POINT
FORECAST SOUNDINGS INDICATE STRONG LOW/MIDLEVEL COLD ADVECTION WILL
CONTINUE THROUGH THE NEXT SEVERAL HRS...AND WILL RESULT IN
STEEPENING LOW-LEVEL LAPSE RATES AND INCREASING UPRIGHT INSTABILITY.
SNOWFALL RATES OF 1-2 IN/HR APPEAR PROBABLE TO DEVELOP WITHIN THIS
BAND...ALTHOUGH ISOLATED LOCATIONS MAY APPROACH 3 IN/HR AT TIMES.
MODEL GUIDANCE SUGGESTS HEAVIEST SNOWFALL WILL SHIFT EWD AFTER 06Z
AS LOW-LEVEL FLOW BACKS SLIGHTLY TOWARDS THE NNW AS THE MID/UPPER
TROUGH MOVES E OF THE REGION.
..ROGERS.. 02/11/2012
...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT...
ATTN...WFO...IWX...LOT...
LAT...LON 40888708 40948744 41298748 41638747 41598729 41688697
41748678 41698659 41348658 40998673 40888708SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Feb 10, 11:50 PM CST | Mesoscale Discussion | SPC | LaPorte, Porter, Starke | 4 hr |
Nearby
Mesoscale Discussions in Indiana, 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.