Alert archive / Arkansas / Mesoscale Discussions in 2014

Mesoscale Discussion 394

April 24, 201425 counties in Arkansas; Adair County, LeFlore County, Sequoyah County, Oklahoma

The Storm Prediction Center issued this mesoscale discussion at Apr 24, 2014, 1:13 PM CDT for 25 counties in Arkansas; Adair County, LeFlore County, Sequoyah County, Oklahoma. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued: Apr 24, 2014, 1:13 PM CDT (18:13 UTC)
Expired: Apr 24, 2014, 3:15 PM CDT
In force: 2 hr
Issued by: the Storm Prediction Center
Chance of a watch: 60%

All 28 counties

Carroll County, AR, Clark County, AR, Conway County, AR, Crawford County, AR, Franklin County, AR, Garland County, AR, Hot Spring County, AR, Howard County, AR, Johnson County, AR, Logan County, AR, Madison County, AR, Montgomery County, AR, Newton County, AR, Perry County, AR, Pike County, AR, Polk County, AR, Pope County, AR, Saline County, AR, Scott County, AR, Searcy County, AR, Sebastian County, AR, Sevier County, AR, Van Buren County, AR, Washington County, AR, Yell County, AR, Adair County, OK, LeFlore County, OK, Sequoyah County, OK

The radar

The Western Arkansas radar (KSRX), 43 km from the middle of the area, began a volume at 18:16 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 12:00Z, 6.2 hours before the alert went out and 188 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: 1520 m above ground
0-6 km bulk shear: 26 kt
0-1 km storm-relative helicity: 397 m²/s²
0-3 km storm-relative helicity: 413 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, 1:58 PM CDT	Mesoscale Discussion	SPC	Arkansas, Ashley, Bradley, Calhoun, Chicot, Cleveland and 12 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
Apr 23, 9:21 PM CDT	Mesoscale Discussion	SPC	Blaine, Caddo, Canadian, Comanche, Cotton, Custer and 8 more	54 min
Apr 24, 10:25 AM CDT	Mesoscale Discussion	SPC	Craig, Creek, Mayes, Nowata, Okmulgee, Osage and 4 more	2 hr

Nearby

Mesoscale Discussions in Arkansas, 2014 Mesoscale Discussions in Oklahoma, 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.