Alert archive / Illinois / Mesoscale Discussions in 2011
Mesoscale Discussion 1003
The Storm Prediction Center issued this mesoscale discussion at May 28, 2011, 12:15 PM CDT for 38 counties in Illinois; 28 counties in Missouri. It was in force for 90 min.
The area
The outline as issued.
The facts
- Issued
- May 28, 2011, 12:15 PM CDT (17:15 UTC)
- Expired
- May 28, 2011, 1:45 PM CDT
- In force
- 90 min
- Issued by
- the Storm Prediction Center
All 66 counties
Adams County, IL, Bond County, IL, Brown County, IL, Calhoun County, IL, Cass County, IL, Champaign County, IL, Christian County, IL, Clark County, IL, Coles County, IL, Crawford County, IL, Cumberland County, IL, DeWitt County, IL, Douglas County, IL, Edgar County, IL, Effingham County, IL, Fayette County, IL, Fulton County, IL, Greene County, IL, Hancock County, IL, Jasper County, IL, Jersey County, IL, Logan County, IL, Macon County, IL, Macoupin County, IL, Madison County, IL, Mason County, IL, McDonough County, IL, Menard County, IL, Montgomery County, IL, Morgan County, IL, Moultrie County, IL, Piatt County, IL, Pike County, IL, Sangamon County, IL, Schuyler County, IL, Scott County, IL, Shelby County, IL, Tazewell County, IL, Adair County, MO, Audrain County, MO, Boone County, MO, Caldwell County, MO, Carroll County, MO, Chariton County, MO, Clark County, MO, Daviess County, MO, Grundy County, MO, Howard County, MO, Knox County, MO, Lewis County, MO, Lincoln County, MO, Linn County, MO, Livingston County, MO, Macon County, MO, Marion County, MO, Monroe County, MO, Montgomery County, MO, Pike County, MO, Ralls County, MO, Randolph County, MO, Ray County, MO, Saline County, MO, Schuyler County, MO, Scotland County, MO, Shelby County, MO, Sullivan County, MO
The radar
The St Louis radar (KLSX), 109 km from the middle of the area, began a volume at 17:17 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
Lincoln, IL (KILX), launched 12:00Z, 5.3 hours before the alert went out and 170 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
- 505 m above ground
- 0-6 km bulk shear
- 61 kt
- 0-1 km storm-relative helicity
- 91 m²/s²
- 0-3 km storm-relative helicity
- 121 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
286
ACUS11 KWNS 281715
SWOMCD
SPC MCD 281715
INZ000-ILZ000-MOZ000-IAZ000-281845-
MESOSCALE DISCUSSION 1003
NWS STORM PREDICTION CENTER NORMAN OK
1215 PM CDT SAT MAY 28 2011
AREAS AFFECTED...NRN MO...CNTRL IL
CONCERNING...SEVERE POTENTIAL...WATCH POSSIBLE
VALID 281715Z - 281845Z
ELEVATED CONVECTION HAS BEEN INCREASING IN THE LAST 1-2 HRS ACROSS
NRN MO INTO CNTRL IL. CONVECTIVE TRENDS WILL BE MONITORED FOR A
POSSIBLE WW.
AN INTENSE STORM IS NOTED OVER MONROE CO MISSOURI AS OF 17Z...WITH
ADDITIONAL ACTIVITY REDEVELOPING OVER NRN MO. MEANWHILE...AN
EXISTING CONVECTIVE CLUSTER CONTINUES TO PROGRESS EWD ACROSS CNTRL
IL. SFC OBJECTIVE ANALYSIS INDICATES THAT THIS ACTIVITY IS LIKELY
ROOTED IN THE 800-700 MB LAYER...WITH MU CAPE OF AROUND 1000 J/KG
AVAILABLE TO ORGANIZED UPDRAFTS. EFFECTIVE SHEAR OF 40-50 KTS WILL
SUPPORT STORM ORGANIZATION AND A POTENTIAL FOR HAIL...THOUGH
RELATIVELY WEAK LAPSE RATES WILL LIKELY LIMIT THE AREAL COVERAGE OF
SEVERE HAIL THREAT. IF COVERAGE BEGINS TO INCREASE MORE THAN
CURRENTLY ANTICIPATED...WW ISSUANCE MAY BE REQUIRED.
..DEAN.. 05/28/2011
...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT...
ATTN...WFO...IND...ILX...LSX...DVN...DMX...EAX...
LAT...LON 38909227 39219414 40109421 40599253 40639104 40568985
40498895 40288823 39828768 39298759 38948772 38808899
38839139 38909227SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 28, 2:25 PM CDT | Severe Thunderstorm Watch | SPC | Champaign, Christian, Clark, Coles, Crawford, Cumberland and 10 more | 5 hr |
| May 28, 3:42 PM CDT | Mesoscale Discussion | SPC | Champaign, Christian, Clark, Coles, Crawford, Cumberland and 15 more | 93 min |
| May 28, 5:39 PM CDT | Mesoscale Discussion | SPC | Bond, Calhoun, Cass, Champaign, Christian, Clark and 28 more | 66 min |
| May 28, 2:50 AM CDT | Mesoscale Discussion | SPC | Barton, Bates, Benton, Cass, Cedar, Dade and 7 more | 85 min |
| May 28, 4:11 AM CDT | Severe Thunderstorm Watch | SPC | Barton, Bates, Benton, Camden, Cedar, Dade and 11 more | 5 hr |
| May 28, 6:06 AM CDT | Mesoscale Discussion | SPC | Barton, Bates, Benton, Camden, Cedar, Cole and 13 more | 84 min |
| May 28, 6:34 PM CDT | Mesoscale Discussion | SPC | Barton, Vernon | 116 min |
Nearby
Mesoscale Discussions in Illinois, 2011Mesoscale Discussions in Missouri, 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.