Alert archive / Arkansas / Mesoscale Discussions in 2013

Mesoscale Discussion 348

March 30, 201312 counties in Arkansas; 12 counties in Oklahoma

The Storm Prediction Center issued this mesoscale discussion at Mar 30, 2013, 10:44 PM CDT for 12 counties in Arkansas; 12 counties in Oklahoma. It was in force for 91 min.

The area

The outline as issued.

The facts

Issued: Mar 30, 2013, 10:44 PM CDT (03:44 UTC)
Expired: Mar 31, 2013, 12:15 AM CDT
In force: 91 min
Issued by: the Storm Prediction Center

All 24 counties

Crawford County, AR, Franklin County, AR, Johnson County, AR, Logan County, AR, Madison County, AR, Newton County, AR, Polk County, AR, Pope County, AR, Scott County, AR, Sebastian County, AR, Washington County, AR, Yell County, AR, Adair County, OK, Atoka County, OK, Cherokee County, OK, Coal County, OK, Haskell County, OK, Latimer County, OK, LeFlore County, OK, McIntosh County, OK, Muskogee County, OK, Pittsburg County, OK, Pushmataha County, OK, Sequoyah County, OK

The radar

The Western Arkansas radar (KSRX), 38 km from the middle of the area, began a volume at 03:45 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

Springfield, MO (KSGF), launched 00:00Z, 3.7 hours before the alert went out and 220 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: 453 J/kg
Mixed-layer CIN: -50 J/kg
Mixed-layer LCL: 1112 m above ground
0-6 km bulk shear: 24 kt
0-1 km storm-relative helicity: 139 m²/s²
0-3 km storm-relative helicity: 218 m²/s²
Significant tornado parameter: 0.2
Supercell composite: 0.8

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
Mar 30, 9:06 PM CDT	Severe Thunderstorm Watch	SPC	Benton, Carroll, Crawford, Franklin, Madison, Sebastian and 1 more	5 hr
Mar 31, 5:10 AM CDT	Severe Thunderstorm Watch	SPC	Hempstead, Howard, Lafayette, Little River, Miller, Sevier	7 hr
Mar 31, 7:36 AM CDT	Mesoscale Discussion	SPC	Columbia, Hempstead, Howard, Lafayette, Little River, Miller and 2 more	114 min
Mar 31, 9:20 AM CDT	Severe Thunderstorm Watch	SPC	Columbia, Union	5 hr
Mar 31, 10:33 AM CDT	Mesoscale Discussion	SPC	Calhoun, Columbia, Union	57 min
Mar 30, 7:37 PM CDT	Mesoscale Discussion	SPC	Adair, Cherokee, Craig, Creek, Delaware, McIntosh and 9 more	53 min
Mar 30, 8:14 PM CDT	Mesoscale Discussion	SPC	Atoka, Carter, Cleveland, Coal, Comanche, Cotton and 17 more	91 min
Mar 31, 1:13 AM CDT	Mesoscale Discussion	SPC	Beckham, Blaine, Caddo, Canadian, Carter, Cleveland and 23 more	62 min
Mar 31, 4:54 AM CDT	Mesoscale Discussion	SPC	Atoka, Bryan, Carter, Choctaw, Coal, Comanche and 12 more	96 min

Nearby

Mesoscale Discussions in Arkansas, 2013 Mesoscale Discussions in Oklahoma, 2013 Every 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.