Alert archive / Illinois / Mesoscale Discussions in 2003
Mesoscale Discussion 12
The Storm Prediction Center issued this mesoscale discussion at Jan 2, 2003, 2:21 AM CST for 39 counties in Illinois; 10 counties in Indiana. It was in force for 114 min.
The area
The outline as issued.
The facts
- Issued
- Jan 2, 2003, 2:21 AM CST (08:21 UTC)
- Expired
- Jan 2, 2003, 4:15 AM CST
- In force
- 114 min
- Issued by
- the Storm Prediction Center
All 49 counties
Bond County, IL, Cass County, IL, Champaign County, IL, Christian County, IL, Clark County, IL, Clay County, IL, Coles County, IL, Crawford County, IL, Cumberland County, IL, DeWitt County, IL, Douglas County, IL, Edgar County, IL, Edwards County, IL, Effingham County, IL, Fayette County, IL, Ford County, IL, Greene County, IL, Jasper County, IL, Jersey County, IL, Lawrence County, IL, Logan County, IL, Macon County, IL, Macoupin County, IL, Madison County, IL, Marion County, IL, Mason County, IL, McLean County, IL, Menard County, IL, Montgomery County, IL, Morgan County, IL, Moultrie County, IL, Piatt County, IL, Richland County, IL, Sangamon County, IL, Scott County, IL, Shelby County, IL, Tazewell County, IL, Vermilion County, IL, Wayne County, IL, Clay County, IN, Fountain County, IN, Montgomery County, IN, Owen County, IN, Parke County, IN, Putnam County, IN, Sullivan County, IN, Vermillion County, IN, Vigo County, IN, Warren County, IN
The nearest sounding before it
Lincoln, IL (KILX), launched 00:00Z, 8.4 hours before the alert went out and 86 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
- 964 m above ground
- 0-6 km bulk shear
- 42 kt
- 0-1 km storm-relative helicity
- 111 m²/s²
- 0-3 km storm-relative helicity
- 155 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
202 ACUS11 KWNS 020821 SWOMCD SPC MCD 020821 MOZ000-ILZ000-INZ000-021015- MESOSCALE DISCUSSION 0012 NWS STORM PREDICTION CENTER NORMAN OK 0221 AM CST THU JAN 02 2003 AREAS AFFECTED...E CNTRL MO...CNTRL IL...CNTRL IND CONCERNING...PRECIPITATION TRENDS...WINTER PRECIPITATION VALID 020821Z - 021015Z SNOW RATES ARE EXPECTED TO CONTINUE DIMINISHING ACROSS PARTS OF THE MIDDLE MISSISSIPPI AND LOWER OHIO VALLEY THROUGH DAYBREAK. STRONGER DIVERGENT UPPER FLOW FIELD NORTHEAST OF CLOSED LOW TRACKING ACROSS THE OZARKS...WILL CONTINUE TO SPREAD EAST NORTHEASTWARD ACROSS CENTRAL ILLINOIS INTO CENTRAL INDIANA DURING THE NEXT 3 TO 6 HOURS. MODELS ALL SUGGEST THIS FORCING WILL SLOWLY WEAKEN...ACCOMPANIED BY WEAKENING FRONTOGENETIC FORCING ...WHICH WILL RESULT IN DECREASING TRENDS IN PRECIPITATION RATES ACROSS CENTRAL ILLINOIS AND INDIANA DURING THE NEXT SEVERAL HOURS. ALTHOUGH ZONE OF MODERATE TO HEAVY PRECIPITATION RATES IS STILL EVIDENT IN RADAR REFLECTIVITY LOOPS SHIFTING NORTHEAST/EAST OF THE ST. LOUIS AREA...DRY LOW-LEVEL ENVIRONMENT OVER THE LOWER OHIO VALLEY SHOULD RESULT IN CONSIDERABLE EVAPORATION/SUBLIMATION AND LIMIT SNOW TOTALS. ..KERR.. 01/02/2003 ...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT... 38699022 39619088 40319033 40548966 40698811 40148671 39468668 38518761 38318843 38608924
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jan 2, 2:17 AM CST | Mesoscale Discussion | SPC | Bond, Cass, Champaign, Christian, Clark, Clay and 33 more | 118 min |
Nearby
Mesoscale Discussions in Illinois, 2003Mesoscale Discussions in Indiana, 2003Every mesoscale discussion in 2003
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.