Alert archive / Arkansas / Mesoscale Discussions in 2013
Mesoscale Discussion 274
The Storm Prediction Center issued this mesoscale discussion at Mar 18, 2013, 7:24 AM CDT for 4 states. It was in force for 3 hr.
The area
The outline as issued.
The facts
- Issued
- Mar 18, 2013, 7:24 AM CDT (12:24 UTC)
- Expired
- Mar 18, 2013, 10:00 AM CDT
- In force
- 3 hr
- Issued by
- the Storm Prediction Center
- Chance of a watch
- 40%
All 49 counties
Arkansas County, AR, Ashley County, AR, Bradley County, AR, Calhoun County, AR, Clark County, AR, Cleveland County, AR, Columbia County, AR, Crittenden County, AR, Cross County, AR, Dallas County, AR, Desha County, AR, Drew County, AR, Faulkner County, AR, Garland County, AR, Grant County, AR, Hempstead County, AR, Hot Spring County, AR, Howard County, AR, Jefferson County, AR, Lafayette County, AR, Lee County, AR, Lincoln County, AR, Little River County, AR, Lonoke County, AR, Miller County, AR, Monroe County, AR, Montgomery County, AR, Nevada County, AR, Ouachita County, AR, Perry County, AR, Phillips County, AR, Pike County, AR, Polk County, AR, Prairie County, AR, Pulaski County, AR, Saline County, AR, Scott County, AR, Sevier County, AR, St. Francis County, AR, Union County, AR, White County, AR, Woodruff County, AR, Yell County, AR, Bolivar County, MS, Coahoma County, MS, Tunica County, MS, McCurtain County, OK, Bowie County, TX, Cass County, TX
The radar
The Little Rock radar (KLZK), 86 km from the middle of the area, began a volume at 12:26 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, 0.4 hours before the alert went out and 268 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
- 11 J/kg
- Mixed-layer CIN
- -390 J/kg
- Mixed-layer LCL
- 432 m above ground
- 0-6 km bulk shear
- 54 kt
- 0-1 km storm-relative helicity
- 227 m²/s²
- 0-3 km storm-relative helicity
- 210 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 2.2
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 17, 10:58 PM CDT | Mesoscale Discussion | SPC | Arkansas, Bradley, Calhoun, Clark, Cleveland, Columbia and 25 more | 3 hr |
| Mar 18, 8:09 AM CDT | Severe Thunderstorm Watch | SPC | Phillips | 7 hr |
| Mar 18, 1:31 PM CDT | Severe Thunderstorm Watch | SPC | Ashley, Chicot | 8 hr |
| Mar 18, 7:40 AM CDT | Mesoscale Discussion | SPC | Alcorn, Benton, Tippah | 2 hr |
| Mar 18, 12:44 PM CDT | Mesoscale Discussion | SPC | Alcorn, Calhoun, Carroll, Chickasaw, Clay, Grenada and 15 more | 91 min |
| Mar 18, 1:10 PM CDT | Mesoscale Discussion | SPC | Attala, Carroll, Choctaw, Clay, Hinds, Holmes and 23 more | 65 min |
| Mar 18, 4:34 PM CDT | Severe Thunderstorm Watch | SPC | Greene, Perry, Wayne | 5 hr |
Nearby
Mesoscale Discussions in Arkansas, 2013Mesoscale Discussions in Mississippi, 2013Mesoscale Discussions in Texas, 2013Every mesoscale discussion in 2013
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.