Alert archive / Arkansas / Mesoscale Discussions in 2012
Mesoscale Discussion 420
The Storm Prediction Center issued this mesoscale discussion at Apr 2, 2012, 5:58 PM CDT for 29 counties in Arkansas; 10 counties in Oklahoma. It was in force for 62 min.
The area
The outline as issued.
The facts
- Issued
- Apr 2, 2012, 5:58 PM CDT (22:58 UTC)
- Expired
- Apr 2, 2012, 7:00 PM CDT
- In force
- 62 min
- Issued by
- the Storm Prediction Center
All 39 counties
Arkansas County, AR, Clark County, AR, Cleveland County, AR, Conway County, AR, Dallas County, AR, Desha County, AR, Faulkner County, AR, Franklin County, AR, Garland County, AR, Grant County, AR, Hot Spring County, AR, Howard County, AR, Jefferson County, AR, Johnson County, AR, Lincoln County, AR, Logan County, AR, Lonoke County, AR, Monroe County, AR, Montgomery County, AR, Perry County, AR, Pike County, AR, Polk County, AR, Pope County, AR, Prairie County, AR, Pulaski County, AR, Saline County, AR, Scott County, AR, Sebastian County, AR, Yell County, AR, Atoka County, OK, Coal County, OK, Haskell County, OK, Hughes County, OK, Latimer County, OK, LeFlore County, OK, McIntosh County, OK, Pittsburg County, OK, Pushmataha County, OK, Sequoyah County, OK
The radar
The Western Arkansas radar (KSRX), 95 km from the middle of the area, began a volume at 23:01 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
Shreveport, LA (KSHV), launched 12:00Z, 11.0 hours before the alert went out and 232 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
- 1679 J/kg
- Mixed-layer CIN
- -73 J/kg
- Mixed-layer LCL
- 558 m above ground
- 0-6 km bulk shear
- 23 kt
- 0-1 km storm-relative helicity
- -91 m²/s²
- 0-3 km storm-relative helicity
- 4 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 |
|---|---|---|---|---|
| Apr 2, 12:15 PM CDT | Mesoscale Discussion | SPC | Ashley, Bradley, Calhoun, Chicot, Clark, Cleveland and 17 more | 90 min |
| Apr 2, 12:41 PM CDT | Severe Thunderstorm Watch | SPC | Bradley, Calhoun, Clark, Cleveland, Columbia, Dallas and 11 more | 6 hr |
| Apr 2, 12:50 PM CDT | Severe Thunderstorm Watch | SPC | Ashley, Chicot | 7 hr |
| Apr 2, 3:18 PM CDT | Mesoscale Discussion | SPC | Ashley, Bradley, Calhoun, Clark, Cleveland, Columbia and 28 more | 117 min |
| Apr 2, 3:23 PM CDT | Mesoscale Discussion | SPC | Ashley, Chicot | 2 hr |
| Apr 2, 3:49 PM CDT | Severe Thunderstorm Watch | SPC | Arkansas, Conway, Crawford, Desha, Faulkner, Franklin and 19 more | 4 hr |
| Apr 2, 3:00 PM CDT | Mesoscale Discussion | SPC | Alfalfa, Beaver, Beckham, Blaine, Caddo, Canadian and 16 more | 2 hr |
| Apr 2, 3:37 PM CDT | Severe Thunderstorm Watch | SPC | Alfalfa, Beaver, Beckham, Blaine, Caddo, Comanche and 16 more | 7 hr |
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.