Alert archive / Illinois / Mesoscale Discussions in 2011
Mesoscale Discussion 879
The Storm Prediction Center issued this mesoscale discussion at May 22, 2011, 10:24 PM CDT for 15 counties in Illinois; Vermillion County, Vigo County, Indiana; 8 counties in Missouri. It was in force for 66 min.
The area
The outline as issued.
The facts
- Issued
- May 22, 2011, 10:24 PM CDT (03:24 UTC)
- Expired
- May 22, 2011, 11:30 PM CDT
- In force
- 66 min
- Issued by
- the Storm Prediction Center
All 25 counties
Clark County, IL, Clay County, IL, Coles County, IL, Crawford County, IL, Cumberland County, IL, Edgar County, IL, Franklin County, IL, Jackson County, IL, Jasper County, IL, Jefferson County, IL, Perry County, IL, Randolph County, IL, Richland County, IL, Washington County, IL, Wayne County, IL, Vermillion County, IN, Vigo County, IN, Bollinger County, MO, Butler County, MO, Cape Girardeau County, MO, Madison County, MO, Perry County, MO, Sainte Genevieve County, MO, Stoddard County, MO, Wayne County, MO
The radar
The Evansville,IN radar (KVWX), 113 km from the middle of the area, began a volume at 03:25 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, 3.4 hours before the alert went out and 200 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
- 2469 J/kg
- Mixed-layer CIN
- -13 J/kg
- Mixed-layer LCL
- 952 m above ground
- 0-6 km bulk shear
- 46 kt
- 0-1 km storm-relative helicity
- 228 m²/s²
- 0-3 km storm-relative helicity
- 319 m²/s²
- Significant tornado parameter
- 3.8
- Supercell composite
- 17.0
The text
As transmitted, in the capitals the NWS used until 2016.
911
ACUS11 KWNS 230325
SWOMCD
SPC MCD 230324
INZ000-ILZ000-MOZ000-230430-
MESOSCALE DISCUSSION 0879
NWS STORM PREDICTION CENTER NORMAN OK
1024 PM CDT SUN MAY 22 2011
AREAS AFFECTED...SRN IL THROUGH SERN MO
CONCERNING...TORNADO WATCH 334...
VALID 230324Z - 230430Z
THE SEVERE WEATHER THREAT FOR TORNADO WATCH 334 CONTINUES.
THREAT FOR MAINLY DAMAGING WIND AND AN ISOLATED TORNADO OR TWO
PERSISTS ACROSS REMAINING PORTION OF WW 334 OVER SRN IL AND SERN MO.
STORMS WILL BEGIN TO MOVE EAST OF WW SHORTLY. WW CAN BE LOCALLY
EXTENDED AS NEEDED IN THE LINCOLN AND PADUCAH WFOS...BUT ANOTHER WW
DOWNSTREAM ACROSS IN IS NOT EXPECTED AT THIS TIME.
STORMS HAVE EVOLVED INTO A PREDOMINANT LINEAR MODE FROM CNTRL IL
SWWD THROUGH ERN MO. OTHER MORE DISCRETE STORMS ARE DEVELOPING IN
THE WARM ADVECTION REGIME EAST OF THE LINE ACROSS EXTREME SERN IL
INTO SWRN IND. THESE ARE LIKELY ELEVATED ABOVE THE SURFACE LAYER.
THE LINE IS EMBEDDED WITHIN FAVORABLE 0-2 KM HODOGRAPHS FOR EMBEDDED
MESOCYCLONES AND BOWING SEGMENTS. DAMAGING WIND AS WELL AS A COUPLE
OF QLCS-TYPE TORNADOES REMAIN POSSIBLE NEXT HOUR OR TWO.
HOWEVER...THE STORMS WILL SOON BEGIN MOVING EAST OF MOIST AXIS WHERE
DEWPOINTS ARE ONLY AROUND 60 F WITH MARGINAL MLCAPE. THIS SUGGEST
THE ACTIVITY SHOULD BEGIN TO UNDERGO A WEAKENING TREND AS THEY
CONTINUE EWD.
..DIAL.. 05/23/2011
...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT...
ATTN...WFO...IND...PAH...ILX...MEG...LSX...
LAT...LON 39298841 39808818 39938743 39218736 38588810 37768920
36618993 36679071 37119057 37789032 38218968 38688885
39298841SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 22, 7:52 PM CDT | Mesoscale Discussion | SPC | Bond, Calhoun, Clinton, Greene, Jersey, Macoupin and 6 more | 53 min |
| May 22, 8:26 PM CDT | Tornado Watch | SPC | Bond, Calhoun, Cass, Champaign, Christian, Clay and 35 more | 8 hr |
| May 22, 9:35 PM CDT | Mesoscale Discussion | SPC | DeKalb, DuPage, Grundy, Iroquois, Kane, Kankakee and 6 more | 55 min |
| May 23, 7:25 AM CDT | Mesoscale Discussion | SPC | Edgar, Vermilion | 65 min |
| May 23, 10:55 AM CDT | Severe Thunderstorm Watch | SPC | Alexander, Bond, Calhoun, Clinton, Edwards, Fayette and 27 more | 7 hr |
| May 23, 12:37 PM CDT | Mesoscale Discussion | SPC | Bond, Christian, Clark, Clay, Clinton, Coles and 34 more | 83 min |
| May 23, 12:54 PM CDT | Severe Thunderstorm Watch | SPC | Champaign, Christian, Clark, Clay, Coles, Crawford and 13 more | 5 hr |
| May 23, 2:52 PM CDT | Mesoscale Discussion | SPC | Clark, Clay, Coles, Crawford, Cumberland, Edgar and 8 more | 53 min |
| May 23, 3:58 PM CDT | Mesoscale Discussion | SPC | Alexander, Edwards, Franklin, Gallatin, Hamilton, Hardin and 14 more | 92 min |
| May 23, 4:24 PM CDT | Mesoscale Discussion | SPC | Massac | 96 min |
| May 22, 7:20 PM CDT | Mesoscale Discussion | SPC | Adams, Allen, Benton, Blackford, Boone, Carroll and 33 more | 115 min |
| May 22, 9:59 PM CDT | Mesoscale Discussion | SPC | Allen, Carroll, Cass, DeKalb, Elkhart, Fulton and 14 more | 61 min |
| May 23, 3:20 AM CDT | Mesoscale Discussion | SPC | Clark, Floyd, Harrison, Jefferson, Ohio, Scott and 1 more | 85 min |
| May 23, 11:35 AM CDT | Mesoscale Discussion | SPC | Adams, Allen, Blackford, Cass, DeKalb, Elkhart and 13 more | 85 min |
| May 23, 1:15 PM CDT | Severe Thunderstorm Watch | SPC | Adams, Allen, Blackford, Cass, DeKalb, Elkhart and 15 more | 8 hr |
| May 23, 3:28 PM CDT | Severe Thunderstorm Watch | SPC | Clark, Crawford, Dearborn, Dubois, Fayette, Floyd and 12 more | 6 hr |
| May 23, 5:20 PM CDT | Mesoscale Discussion | SPC | Clark, Crawford, Dearborn, Decatur, Fayette, Floyd and 15 more | 55 min |
| May 23, 5:40 PM CDT | Mesoscale Discussion | SPC | Adams, Allen, Blackford, DeKalb, Grant, Howard and 8 more | 65 min |
| May 22, 8:47 PM CDT | Tornado Watch | SPC | Dunklin, Pemiscot | 7 hr |
| May 22, 11:46 PM CDT | Mesoscale Discussion | SPC | Dunklin, Pemiscot | 89 min |
| May 23, 5:07 AM CDT | Mesoscale Discussion | SPC | Barry, Barton, Carter, Cedar, Christian, Dade and 24 more | 113 min |
| May 23, 5:41 AM CDT | Mesoscale Discussion | SPC | Barton, Bates, Cedar, Dade, Hickory, Jasper and 5 more | 94 min |
| May 23, 6:08 AM CDT | Severe Thunderstorm Watch | SPC | Barry, Barton, Bates, Benton, Camden, Cass and 34 more | 7 hr |
| May 23, 7:38 AM CDT | Mesoscale Discussion | SPC | Barry, Barton, Bates, Benton, Camden, Cedar and 17 more | 97 min |
| May 23, 10:34 AM CDT | Mesoscale Discussion | SPC | Barry, Barton, Bollinger, Butler, Camden, Carter and 37 more | 86 min |
| May 23, 12:12 PM CDT | Mesoscale Discussion | SPC | Barry, Camden, Carter, Christian, Dade, Dallas and 24 more | 93 min |
| May 23, 1:16 PM CDT | Mesoscale Discussion | SPC | Butler, Dunklin, New Madrid, Pemiscot, Ripley | 89 min |
| May 23, 1:34 PM CDT | Severe Thunderstorm Watch | SPC | Dunklin, Pemiscot | 6 hr |
Nearby
Mesoscale Discussions in Illinois, 2011Mesoscale Discussions in Missouri, 2011Mesoscale Discussions in Indiana, 2011Every mesoscale discussion in 2011
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.