Alert archive / Arkansas / Mesoscale Discussions in 2020
Mesoscale Discussion 173
The Storm Prediction Center issued this mesoscale discussion at Mar 12, 2020, 5:51 PM CDT for 7 counties in Arkansas; 5 counties in Missouri; Dyer County, Lake County, Obion County, Tennessee. It was in force for 84 min.
The area
The outline as issued.
The facts
- Issued
- Mar 12, 2020, 5:51 PM CDT (22:51 UTC)
- Expired
- Mar 12, 2020, 7:15 PM CDT
- In force
- 84 min
- Issued by
- the Storm Prediction Center
Counties Clay County, AR, Craighead County, AR, Greene County, AR, Lawrence County, AR, Mississippi County, AR, Randolph County, AR, Sharp County, AR, Butler County, MO, Dunklin County, MO, New Madrid County, MO, Pemiscot County, MO, Ripley County, MO, Dyer County, TN, Lake County, TN, Obion County, TN
The radar
The Memphis radar (KNQA), 113 km from the middle of the area, began a volume at 22:54 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
Little Rock, AR (KLZK), launched 12:00Z, 10.9 hours before the alert went out and 160 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
- 210 J/kg
- Mixed-layer CIN
- -230 J/kg
- Mixed-layer LCL
- 821 m above ground
- 0-6 km bulk shear
- 50 kt
- 0-1 km storm-relative helicity
- 248 m²/s²
- 0-3 km storm-relative helicity
- 266 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.6
The text
As transmitted.
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</html>SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Mar 12, 11:13 AM CDT | Mesoscale Discussion | SPC | Mississippi | 2 hr |
| Mar 12, 2:31 PM CDT | Mesoscale Discussion | SPC | Baxter, Boone, Clay, Cleburne, Conway, Craighead and 18 more | 89 min |
| Mar 12, 3:44 PM CDT | Tornado Watch | SPC | Baxter, Boone, Clark, Clay, Cleburne, Conway and 42 more | 7 hr |
| Mar 12, 9:21 AM CDT | Mesoscale Discussion | SPC | Audrain, Benton, Boone, Callaway, Camden, Cole and 28 more | 114 min |
| Mar 12, 11:44 AM CDT | Tornado Watch | SPC | Bollinger, Cape Girardeau, Mississippi, New Madrid, Pemiscot, Perry and 2 more | 6 hr |
| Mar 12, 1:28 PM CDT | Mesoscale Discussion | SPC | Bollinger, Cape Girardeau, Perry, Sainte Genevieve | 2 hr |
| Mar 12, 5:09 PM CDT | Tornado Watch | SPC | Clay, Fentress, Jackson, Macon, Overton, Pickett and 1 more | 5 hr |
| Mar 12, 6:20 PM CDT | Mesoscale Discussion | SPC | Pickett | 85 min |
Nearby
Mesoscale Discussions in Arkansas, 2020Mesoscale Discussions in Missouri, 2020Mesoscale Discussions in Tennessee, 2020Every mesoscale discussion in 2020
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.