Alert archive / Arkansas / Mesoscale Discussions in 2014

Mesoscale Discussion 395

April 24, 201418 counties in Arkansas; 8 parishes in Louisiana; 8 counties in Mississippi

The Storm Prediction Center issued this mesoscale discussion at Apr 24, 2014, 1:58 PM CDT for 18 counties in Arkansas; 8 parishes in Louisiana; 8 counties in Mississippi. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued: Apr 24, 2014, 1:58 PM CDT (18:58 UTC)
Expired: Apr 24, 2014, 4:00 PM CDT
In force: 2 hr
Issued by: the Storm Prediction Center
Chance of a watch: 60%

All 34 counties

Arkansas County, AR, Ashley County, AR, Bradley County, AR, Calhoun County, AR, Chicot County, AR, Cleveland County, AR, Columbia County, AR, Desha County, AR, Drew County, AR, Lafayette County, AR, Lee County, AR, Lincoln County, AR, Monroe County, AR, Nevada County, AR, Ouachita County, AR, Phillips County, AR, St. Francis County, AR, Union County, AR, Bossier Parish, LA, Claiborne Parish, LA, East Carroll Parish, LA, Lincoln Parish, LA, Morehouse Parish, LA, Union Parish, LA, Webster Parish, LA, West Carroll Parish, LA, Bolivar County, MS, Coahoma County, MS, Leflore County, MS, Quitman County, MS, Sunflower County, MS, Tallahatchie County, MS, Tunica County, MS, Washington County, MS

The radar

The Little Rock radar (KLZK), 139 km from the middle of the area, began a volume at 18:59 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.

Severe Thunderstorm Watch 90Apr 24, 2:40 PM CDT

The nearest sounding before it

Shreveport, LA (KBAD), launched 12:00Z, 7.0 hours before the alert went out and 211 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.

Skew-T log-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.

Mixed-layer CAPE: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 947 m above ground
0-6 km bulk shear: 31 kt
0-1 km storm-relative helicity: 95 m²/s²
0-3 km storm-relative helicity: 197 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

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SPC that day

Everything else SPC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Apr 24, 1:13 PM CDT	Mesoscale Discussion	SPC	Carroll, Clark, Conway, Crawford, Franklin, Garland and 19 more	2 hr
Apr 24, 2:21 PM CDT	Severe Thunderstorm Watch	SPC	Benton, Carroll, Crawford, Franklin, Madison, Sebastian and 1 more	6 hr
Apr 24, 2:38 PM CDT	Severe Thunderstorm Watch	SPC	Arkansas, Ashley, Baxter, Boone, Bradley, Calhoun and 62 more	9 hr
Apr 24, 3:47 PM CDT	Mesoscale Discussion	SPC	Arkansas, Ashley, Baxter, Benton, Boone, Bradley and 69 more	88 min
Apr 24, 5:50 PM CDT	Mesoscale Discussion	SPC	Arkansas, Ashley, Baxter, Boone, Bradley, Calhoun and 61 more	85 min

Nearby

Mesoscale Discussions in Arkansas, 2014 Mesoscale Discussions in Louisiana, 2014 Mesoscale Discussions in Mississippi, 2014 Every mesoscale discussion in 2014

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.