Alert archive / Missouri / Mesoscale Discussions in 2011
Mesoscale Discussion 771
The Storm Prediction Center issued this mesoscale discussion at May 12, 2011, 10:09 PM CDT for Clay County, Arkansas; 24 counties in Missouri. It was in force for 66 min.
The area
The outline as issued.
The facts
- Issued
- May 12, 2011, 10:09 PM CDT (03:09 UTC)
- Expired
- May 12, 2011, 11:15 PM CDT
- In force
- 66 min
- Issued by
- the Storm Prediction Center
All 25 counties
Clay County, AR, Bollinger County, MO, Butler County, MO, Carter County, MO, Crawford County, MO, Dent County, MO, Dunklin County, MO, Franklin County, MO, Gasconade County, MO, Iron County, MO, Jefferson County, MO, Madison County, MO, Maries County, MO, Oregon County, MO, Osage County, MO, Phelps County, MO, Reynolds County, MO, Ripley County, MO, Saint Francois County, MO, Sainte Genevieve County, MO, Scott County, MO, Shannon County, MO, Stoddard County, MO, Washington County, MO, Wayne County, MO
The radar
The St Louis radar (KLSX), 112 km from the middle of the area, began a volume at 03:11 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
Springfield, MO (KSGF), launched 00:00Z, 3.2 hours before the alert went out and 265 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
- 1521 J/kg
- Mixed-layer CIN
- -8 J/kg
- Mixed-layer LCL
- 1233 m above ground
- 0-6 km bulk shear
- 38 kt
- 0-1 km storm-relative helicity
- 84 m²/s²
- 0-3 km storm-relative helicity
- 153 m²/s²
- Significant tornado parameter
- 0.7
- Supercell composite
- 6.8
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 12, 9:41 PM CDT | Mesoscale Discussion | SPC | Baxter, Boone, Cleburne, Conway, Crawford, Faulkner and 22 more | 64 min |
| May 12, 10:03 PM CDT | Severe Thunderstorm Watch | SPC | Baxter, Cleburne, Conway, Crawford, Faulkner, Franklin and 26 more | 7 hr |
| May 13, 12:01 PM CDT | Mesoscale Discussion | SPC | Arkansas, Clay, Craighead, Crittenden, Cross, Greene and 13 more | 89 min |
| May 13, 12:31 PM CDT | Severe Thunderstorm Watch | SPC | Clay, Craighead, Crittenden, Cross, Greene, Lawrence and 6 more | 6 hr |
| May 13, 2:44 PM CDT | Mesoscale Discussion | SPC | Crittenden, Mississippi | 2 hr |
| May 12, 9:16 PM CDT | Mesoscale Discussion | SPC | Atchison | 59 min |
| May 13, 4:40 PM CDT | Mesoscale Discussion | SPC | Lincoln, Saint Charles, Saint Louis, City of Saint Louis | 95 min |
Nearby
Mesoscale Discussions in Missouri, 2011Mesoscale Discussions in Arkansas, 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.