Alert archive / Arkansas / Mesoscale Discussions in 2012
Mesoscale Discussion 298
The Storm Prediction Center issued this mesoscale discussion at Mar 19, 2012, 8:48 PM CDT for 6 counties in Arkansas; 6 counties in Oklahoma. It was in force for 57 min.
The area
The outline as issued.
The facts
- Issued
- Mar 19, 2012, 8:48 PM CDT (01:48 UTC)
- Expired
- Mar 19, 2012, 9:45 PM CDT
- In force
- 57 min
- Issued by
- the Storm Prediction Center
Counties Benton County, AR, Carroll County, AR, Crawford County, AR, Madison County, AR, Sebastian County, AR, Washington County, AR, Adair County, OK, Cherokee County, OK, Haskell County, OK, Latimer County, OK, LeFlore County, OK, Sequoyah County, OK
The radar
The Western Arkansas radar (KSRX), 31 km from the middle of the area, began a volume at 01:48 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
Springfield, MO (KSGF), launched 00:00Z, 1.8 hours before the alert went out and 182 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
- 173 J/kg
- Mixed-layer CIN
- -17 J/kg
- Mixed-layer LCL
- 1207 m above ground
- 0-6 km bulk shear
- 38 kt
- 0-1 km storm-relative helicity
- 221 m²/s²
- 0-3 km storm-relative helicity
- 369 m²/s²
- Significant tornado parameter
- 0.2
- Supercell composite
- 3.0
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 |
|---|---|---|---|---|
| Mar 19, 7:28 PM CDT | Tornado Watch | SPC | Howard, Little River, Miller, Sevier | 9 hr |
| Mar 19, 10:17 PM CDT | Mesoscale Discussion | SPC | Baxter, Boone, Marion, Newton, Pope, Searcy | 58 min |
| Mar 19, 10:35 PM CDT | Severe Thunderstorm Watch | SPC | Baxter, Boone, Marion, Newton, Searcy | 3 hr |
| Mar 20, 1:48 PM CDT | Mesoscale Discussion | SPC | Arkansas, Ashley, Bradley, Calhoun, Cleburne, Cleveland and 22 more | 117 min |
| Mar 20, 2:55 PM CDT | Tornado Watch | SPC | Arkansas, Baxter, Bradley, Calhoun, Cleburne, Cleveland and 25 more | 7 hr |
| Mar 20, 5:57 PM CDT | Mesoscale Discussion | SPC | Arkansas, Fulton, Independence, Izard, Jackson, Monroe and 4 more | 93 min |
Nearby
Mesoscale 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.