Alert archive / Illinois / Mesoscale Discussions in 2016
Mesoscale Discussion 458
The Storm Prediction Center issued this mesoscale discussion at Apr 26, 2016, 2:42 PM CDT for 5 states. It was in force for 2 hr.
The area
The outline as issued.
The facts
- Issued
- Apr 26, 2016, 2:42 PM CDT (19:42 UTC)
- Expired
- Apr 26, 2016, 4:45 PM CDT
- In force
- 2 hr
- Issued by
- the Storm Prediction Center
All 85 counties
Alexander County, IL, Bond County, IL, Clay County, IL, Clinton County, IL, Edwards County, IL, Fayette County, IL, Franklin County, IL, Gallatin County, IL, Hamilton County, IL, Hardin County, IL, Jackson County, IL, Jefferson County, IL, Johnson County, IL, Madison County, IL, Marion County, IL, Massac County, IL, Monroe County, IL, Perry County, IL, Pope County, IL, Pulaski County, IL, Randolph County, IL, Saint Clair County, IL, Saline County, IL, Union County, IL, Wabash County, IL, Washington County, IL, Wayne County, IL, White County, IL, Williamson County, IL, Gibson County, IN, Posey County, IN, Spencer County, IN, Vanderburgh County, IN, Warrick County, IN, Ballard County, KY, Caldwell County, KY, Calloway County, KY, Carlisle County, KY, Christian County, KY, Crittenden County, KY, Daviess County, KY, Fulton County, KY, Graves County, KY, Hancock County, KY, Henderson County, KY, Hickman County, KY, Hopkins County, KY, Livingston County, KY, Logan County, KY, Lyon County, KY, Marshall County, KY, McCracken County, KY, McLean County, KY, Muhlenberg County, KY, Ohio County, KY, Todd County, KY, Trigg County, KY, Union County, KY, Webster County, KY, Bollinger County, MO, Cape Girardeau County, MO, City of Saint Louis, MO, Iron County, MO, Jefferson County, MO, Madison County, MO, Mississippi County, MO, New Madrid County, MO, Perry County, MO, Reynolds County, MO, Saint Francois County, MO, Saint Louis County, MO, Sainte Genevieve County, MO, Scott County, MO, Stoddard County, MO, Washington County, MO, Wayne County, MO, Benton County, TN, Dickson County, TN, Henry County, TN, Houston County, TN, Humphreys County, TN, Montgomery County, TN, Obion County, TN, Stewart County, TN, Weakley County, TN
The radar
The Paducah radar (KPAH), 65 km from the middle of the area, began a volume at 19:44 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 watches that followed
Watches SPC issued over any of the same counties within four hours of this discussion.
The nearest sounding before it
Nashville Metro, TN (KBNA), launched 12:00Z, 7.7 hours before the alert went out and 268 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
- 36 J/kg
- Mixed-layer CIN
- -100 J/kg
- Mixed-layer LCL
- 1318 m above ground
- 0-6 km bulk shear
- 28 kt
- 0-1 km storm-relative helicity
- 148 m²/s²
- 0-3 km storm-relative helicity
- 129 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
462
ACUS11 KWNS 261943
SWOMCD
SPC MCD 261942
KYZ000-TNZ000-INZ000-ILZ000-MOZ000-262145-
MESOSCALE DISCUSSION 0458
NWS STORM PREDICTION CENTER NORMAN OK
0242 PM CDT TUE APR 26 2016
AREAS AFFECTED...SE MO...SRN IL...FAR SW IND...NW TN
CONCERNING...SEVERE THUNDERSTORM WATCH 106...
VALID 261942Z - 262145Z
THE SEVERE WEATHER THREAT FOR SEVERE THUNDERSTORM WATCH 106
CONTINUES.
SUMMARY...A LINE OF SEVERE STORMS ASSOCIATED WITH DAMAGING WIND
GUSTS AND HAIL...WILL MOVE ESEWD ACROSS SE MO...SRN IL..SW IND AND
WRN KY THIS AFTERNOON. A NEW WW MAY BE NEEDED TO THE SOUTHEAST OF WW
106.
DISCUSSION...LATEST RADAR TRENDS SHOW A WELL-DEVELOPED BOWING LINE
SEGMENT ACROSS FAR WRN IL EXTENDING SWWD INTO SE MO. THE LINE IS
LOCATED TO THE SOUTH OF A QUASI-STATIONARY FRONT IN A MOIST AIRMASS.
AHEAD OF THE BOW...SFC DEWPOINTS IN THE MID TO UPPER 60S F COMBINED
WITH SFC TEMPS IN THE LOWER 80S F ARE CONTRIBUTING TO MODERATE
INSTABILITY WITH MLCAPE OF 2000-2500 J/KG ACCORDING TO MESOSCALE
ANALYSIS. THIS SHOULD HELP THE LINE TO BE MAINTAINED THROUGH THE
REST OF THE AFTERNOON AND POSSIBLY INTO THE EARLY EVENING. THE
LATEST HRRR RUN MOVES THE BOWING LINE SEGMENT ESEWD ACROSS SRN IL
INTO SW IND AND WRN KY BY 23Z TO 00Z. THE ST LOUIS AIRPORT RECENTLY
REPORTED A WIND GUST OF 53 KNOTS ASSOCIATED WITH THE LINE AND THIS
POTENTIAL FOR DAMAGING WIND GUSTS SHOULD CONTINUE IN AREAS TO THE
EAST OF THE MS RIVER ACROSS SRN IL AND WRN KY.
..BROYLES/CORFIDI.. 04/26/2016
...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT...
ATTN...WFO...LMK...OHX...IND...PAH...ILX...MEG...LSX...SGF...
LAT...LON 39139023 38129070 37689140 37129106 35988835 36048736
36418702 37398663 38068685 38988860 39139023SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 26, 10:03 AM CDT | Mesoscale Discussion | SPC | Calhoun, Greene, Jersey, Monroe, Randolph, Saint Clair | 117 min |
| Apr 26, 11:52 AM CDT | Severe Thunderstorm Watch | SPC | Bond, Calhoun, Christian, Clay, Clinton, Effingham and 18 more | 7 hr |
| Apr 26, 12:58 PM CDT | Mesoscale Discussion | SPC | Crawford, Lawrence | 3 hr |
| Apr 26, 3:03 PM CDT | Severe Thunderstorm Watch | SPC | Alexander, Clark, Coles, Crawford, Cumberland, Edgar and 19 more | 6 hr |
| Apr 26, 5:05 PM CDT | Mesoscale Discussion | SPC | Dearborn, Fayette, Franklin, Ohio, Ripley, Switzerland and 1 more | 115 min |
| Apr 26, 5:45 PM CDT | Severe Thunderstorm Watch | SPC | Dearborn, Fayette, Franklin, Ohio, Ripley, Switzerland and 2 more | 6 hr |
| Apr 26, 2:18 AM CDT | Mesoscale Discussion | SPC | Andrew, Buchanan, Caldwell, Carroll, Cass, Clay and 12 more | 117 min |
| Apr 26, 4:37 AM CDT | Mesoscale Discussion | SPC | Buchanan, Cass, Clay, Clinton, Jackson, Johnson and 4 more | 83 min |
| Apr 26, 6:23 AM CDT | Severe Thunderstorm Watch | SPC | Andrew, Audrain, Bates, Benton, Boone, Buchanan and 30 more | 7 hr |
| Apr 26, 7:18 AM CDT | Mesoscale Discussion | SPC | Andrew, Boone, Buchanan, Caldwell, Carroll, Chariton and 16 more | 87 min |
| Apr 26, 6:14 PM CDT | Mesoscale Discussion | SPC | Andrew, Atchison, Buchanan, Clay, Clinton, DeKalb and 3 more | 61 min |
Nearby
Mesoscale Discussions in Illinois, 2016Mesoscale Discussions in Kentucky, 2016Mesoscale Discussions in Missouri, 2016Every mesoscale discussion in 2016
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.