Alert archive / Missouri / Mesoscale Discussions in 2012
Mesoscale Discussion 1977
The Storm Prediction Center issued this mesoscale discussion at Sep 21, 2012, 12:45 AM CDT for 14 counties in Arkansas; 16 counties in Missouri; Delaware County, Oklahoma. It was in force for 2 hr.
The area
The outline as issued.
The facts
- Issued
- Sep 21, 2012, 12:45 AM CDT (05:45 UTC)
- Expired
- Sep 21, 2012, 2:45 AM CDT
- In force
- 2 hr
- Issued by
- the Storm Prediction Center
- Chance of a watch
- 20%
All 31 counties
Baxter County, AR, Benton County, AR, Boone County, AR, Carroll County, AR, Fulton County, AR, Izard County, AR, Madison County, AR, Marion County, AR, Newton County, AR, Randolph County, AR, Searcy County, AR, Sharp County, AR, Stone County, AR, Washington County, AR, Barry County, MO, Carter County, MO, Christian County, MO, Douglas County, MO, Howell County, MO, Lawrence County, MO, McDonald County, MO, Newton County, MO, Oregon County, MO, Ozark County, MO, Ripley County, MO, Shannon County, MO, Stone County, MO, Taney County, MO, Webster County, MO, Wright County, MO, Delaware County, OK
The radar
The Springfield radar (KSGF), 102 km from the middle of the area, began a volume at 05:46 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, 5.8 hours before the alert went out and 104 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
- 2363 m above ground
- 0-6 km bulk shear
- 33 kt
- 0-1 km storm-relative helicity
- 14 m²/s²
- 0-3 km storm-relative helicity
- 134 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
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 |
|---|---|---|---|---|
| Sep 21, 4:59 PM CDT | Mesoscale Discussion | SPC | City of Saint Louis | 91 min |
Nearby
Mesoscale Discussions in Missouri, 2012Mesoscale Discussions in Arkansas, 2012Mesoscale Discussions in Oklahoma, 2012Every mesoscale discussion in 2012
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.