Alert archive / Illinois / Mesoscale Discussions in 2017
Mesoscale Discussion 41
The Storm Prediction Center issued this mesoscale discussion at Jan 14, 2017, 2:14 AM CST for 32 counties in Illinois; 17 counties in Indiana; 24 counties in Missouri. It was in force for 6 hr.
The area
The outline as issued.
The facts
- Issued
- Jan 14, 2017, 2:14 AM CST (08:14 UTC)
- Expired
- Jan 14, 2017, 8:15 AM CST
- In force
- 6 hr
- Issued by
- the Storm Prediction Center
All 73 counties
Bond County, IL, Calhoun County, IL, Christian County, IL, Clark County, IL, Clay County, IL, Clinton County, IL, Coles County, IL, Crawford County, IL, Cumberland County, IL, Douglas County, IL, Edgar County, IL, Effingham County, IL, Fayette County, IL, Greene County, IL, Jasper County, IL, Jersey County, IL, Macon County, IL, Macoupin County, IL, Madison County, IL, Marion County, IL, Monroe County, IL, Montgomery County, IL, Morgan County, IL, Moultrie County, IL, Piatt County, IL, Pike County, IL, Randolph County, IL, Saint Clair County, IL, Sangamon County, IL, Scott County, IL, Shelby County, IL, Washington County, IL, Boone County, IN, Brown County, IN, Clay County, IN, Fountain County, IN, Greene County, IN, Hendricks County, IN, Johnson County, IN, Marion County, IN, Monroe County, IN, Montgomery County, IN, Morgan County, IN, Owen County, IN, Parke County, IN, Putnam County, IN, Sullivan County, IN, Vermillion County, IN, Vigo County, IN, Callaway County, MO, City of Saint Louis, MO, Crawford County, MO, Dent County, MO, Franklin County, MO, Gasconade County, MO, Iron County, MO, Jefferson County, MO, Lincoln County, MO, Madison County, MO, Maries County, MO, Montgomery County, MO, Osage County, MO, Perry County, MO, Phelps County, MO, Pike County, MO, Ralls County, MO, Reynolds County, MO, Saint Charles County, MO, Saint Francois County, MO, Saint Louis County, MO, Sainte Genevieve County, MO, Warren County, MO, Washington County, MO
The radar
The St Louis radar (KLSX), 115 km from the middle of the area, began a volume at 08:16 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, 8.2 hours before the alert went out and 165 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
- 1206 m above ground
- 0-6 km bulk shear
- 81 kt
- 0-1 km storm-relative helicity
- 160 m²/s²
- 0-3 km storm-relative helicity
- 411 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
533
ACUS11 KWNS 140814
SWOMCD
SPC MCD 140814
INZ000-ILZ000-MOZ000-141415-
Mesoscale Discussion 0041
NWS Storm Prediction Center Norman OK
0214 AM CST Sat Jan 14 2017
Areas affected...parts of east-central MO...south-central and
central IL...west-central and central IN
Concerning...Freezing rain
Valid 140814Z - 141415Z
SUMMARY...Freezing rain rates 0.05-0.10 inch per 3 hours are
forecast during the late overnight across the middle MS Valley and
this morning over parts of the Wabash Valley.
DISCUSSION...Radar imagery at 08 UTC shows widely scattered showers
across the middle MS Valley within a moderately strong belt of
west-southwesterly flow in the 1-3 km AGL layer. Surface analysis
indicates temperatures are at or below freezing from portions of
southeastern MO and extending to the northeast across south-central
IL and into southern IN. The freezing line is forecast to be
quasi-stationary during the next 6 hours. Above the near-surface
layer, temperatures are around 8 deg C at 850 mb--resulting in a
thermal profile supportive of freezing rain. Host of deterministic
model and short-term ensemble guidance suggests showers will
gradually increase in coverage and rates will slowly intensify
within a corridor from near St. Louis over the next several hours
and move eastward along the IL/IN I-70 corridor towards Indianapolis
by this morning. Freezing rain rates of 0.05-0.10 inch per 3 hours
are forecast in areas, especially where the showers exhibit some
convective characteristics and locally augment rates.
..Smith.. 01/14/2017
...Please see www.spc.noaa.gov for graphic product...
ATTN...WFO...IND...PAH...ILX...LSX...SGF...
LAT...LON 38569211 39799152 40158745 40088625 39738595 39238608
38528903 37439002 37189074 37439169 38569211SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jan 14, 10:27 AM CST | Mesoscale Discussion | SPC | Boone, Delaware, Fayette, Hamilton, Hancock, Henry and 6 more | 4 hr |
| Jan 14, 5:41 AM CST | Mesoscale Discussion | SPC | Newton | 3 hr |
Nearby
Mesoscale Discussions in Illinois, 2017Mesoscale Discussions in Missouri, 2017Mesoscale Discussions in Indiana, 2017Every mesoscale discussion in 2017
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.