Alert archive / Illinois / Mesoscale Discussions in 2009
Mesoscale Discussion 810
The Storm Prediction Center issued this mesoscale discussion at May 13, 2009, 9:27 AM CDT for 60 counties in Illinois; 22 counties in Indiana; 21 counties in Missouri. It was in force for 63 min.
The area
The outline as issued.
The facts
- Issued
- May 13, 2009, 9:27 AM CDT (14:27 UTC)
- Expired
- May 13, 2009, 10:30 AM CDT
- In force
- 63 min
- Issued by
- the Storm Prediction Center
All 103 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, Clay County, IL, Clinton 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, Franklin County, IL, Fulton County, IL, Greene County, IL, Hamilton County, IL, Hancock County, IL, Henderson County, IL, Jasper County, IL, Jefferson County, IL, Jersey County, IL, Knox County, IL, Lawrence County, IL, Logan County, IL, Macon County, IL, Macoupin County, IL, Madison County, IL, Marion County, IL, Mason County, IL, McDonough County, IL, McLean County, IL, Menard County, IL, Montgomery County, IL, Morgan County, IL, Moultrie County, IL, Peoria County, IL, Piatt County, IL, Pike County, IL, Richland County, IL, Saint Clair County, IL, Sangamon County, IL, Schuyler County, IL, Scott County, IL, Shelby County, IL, Tazewell County, IL, Vermilion County, IL, Wabash County, IL, Warren County, IL, Washington County, IL, Wayne County, IL, White County, IL, Woodford County, IL, Brown County, IN, Clay County, IN, Daviess County, IN, Dubois County, IN, Fountain County, IN, Gibson County, IN, Greene County, IN, Knox County, IN, Lawrence County, IN, Martin County, IN, Monroe County, IN, Morgan County, IN, Owen County, IN, Parke County, IN, Pike County, IN, Posey County, IN, Putnam County, IN, Sullivan County, IN, Vanderburgh County, IN, Vermillion County, IN, Vigo County, IN, Warrick County, IN, Adair County, MO, Audrain County, MO, Carroll County, MO, Chariton County, MO, City of Saint Louis, MO, Clark 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, Saint Charles County, MO, Saint Louis County, MO, Shelby County, MO
The radar
The St Louis radar (KLSX), 98 km from the middle of the area, began a volume at 14:29 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 12:00Z, 2.5 hours before the alert went out and 146 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
- -314 J/kg
- Mixed-layer LCL
- 538 m above ground
- 0-6 km bulk shear
- 41 kt
- 0-1 km storm-relative helicity
- 586 m²/s²
- 0-3 km storm-relative helicity
- 759 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 1.4
The text
As transmitted, in the capitals the NWS used until 2016.
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</html>SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 13, 1:15 PM CDT | Mesoscale Discussion | SPC | Bond, Clinton, Franklin, Jackson, Jefferson, Macoupin and 7 more | 30 min |
| May 13, 1:52 PM CDT | Mesoscale Discussion | SPC | Adams, Brown, Calhoun, Greene, Hancock, Jersey and 3 more | 23 min |
| May 13, 2:39 PM CDT | Tornado Watch | SPC | Adams, Brown, Bureau, Calhoun, Cass, Fulton and 16 more | 7 hr |
| May 13, 3:00 PM CDT | Tornado Watch | SPC | Bond, Clark, Clay, Clinton, Crawford, Cumberland and 24 more | 5 hr |
| May 13, 5:47 PM CDT | Mesoscale Discussion | SPC | Adams, Boone, Brown, Bureau, Carroll, Cass and 50 more | 88 min |
| May 13, 6:02 PM CDT | Tornado Watch | SPC | Boone, Champaign, Cook, DeKalb, DeWitt, DuPage and 26 more | 5 hr |
| May 13, 6:05 PM CDT | Mesoscale Discussion | SPC | Clark, Clay, Crawford, Edwards, Effingham, Franklin and 17 more | 85 min |
| May 13, 4:51 PM CDT | Severe Thunderstorm Watch | SPC | Barton, Bates, Benton, Boone, Caldwell, Camden and 26 more | 6 hr |
| May 13, 6:30 PM CDT | Mesoscale Discussion | SPC | Barton, Bates, Benton, Carroll, Cass, Cooper and 11 more | 90 min |
Nearby
Mesoscale Discussions in Illinois, 2009Mesoscale Discussions in Indiana, 2009Mesoscale Discussions in Missouri, 2009Every mesoscale discussion in 2009
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.