Alert archive / Arkansas / Mesoscale Discussions in 2013

Mesoscale Discussion 1480

July 23, 201331 counties in Arkansas; 15 counties in Missouri; 11 counties in Oklahoma

The Storm Prediction Center issued this mesoscale discussion at Jul 23, 2013, 12:33 PM CDT for 31 counties in Arkansas; 15 counties in Missouri; 11 counties in Oklahoma. It was in force for 87 min.

The area

The outline as issued.

The facts

Issued
Jul 23, 2013, 12:33 PM CDT (17:33 UTC)
Expired
Jul 23, 2013, 2:00 PM CDT
In force
87 min
Issued by
the Storm Prediction Center
Chance of a watch
40%
All 57 counties

Baxter County, AR, Benton County, AR, Boone County, AR, Carroll County, AR, Clark County, AR, Conway County, AR, Crawford County, AR, Dallas County, AR, Franklin County, AR, Fulton County, AR, Garland County, AR, Grant County, AR, Hot Spring County, AR, Johnson County, AR, Logan County, AR, Madison County, AR, Marion County, AR, Montgomery County, AR, Newton County, AR, Perry County, AR, Polk County, AR, Pope County, AR, Pulaski County, AR, Saline County, AR, Scott County, AR, Searcy County, AR, Sebastian County, AR, Stone County, AR, Van Buren County, AR, Washington County, AR, Yell County, AR, Barry County, MO, Christian County, MO, Douglas County, MO, Greene County, MO, Howell County, MO, Lawrence County, MO, McDonald County, MO, Newton County, MO, Ozark County, MO, Shannon County, MO, Stone County, MO, Taney County, MO, Texas County, MO, Webster County, MO, Wright County, MO, Adair County, OK, Cherokee County, OK, Craig County, OK, Delaware County, OK, Haskell County, OK, LeFlore County, OK, Mayes County, OK, Muskogee County, OK, Ottawa County, OK, Sequoyah County, OK, Wagoner County, OK

The radar

The Little Rock radar (KLZK), 109 km from the middle of the area, began a volume at 17:27 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, 5.6 hours before the alert went out and 159 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-pSkew-T log-p diagram, Springfield, MO at 12:00Z on 2013-07-23Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1279 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Springfield, MO at 12:00Z on 2013-07-23The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 271 square meters per square second.193958Sfc1 km3 km6 km9 kmRMLM
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
1279 J/kg
Mixed-layer CIN
-126 J/kg
Mixed-layer LCL
1415 m above ground
0-6 km bulk shear
26 kt
0-1 km storm-relative helicity
271 m²/s²
0-3 km storm-relative helicity
287 m²/s²
Significant tornado parameter
0.0
Supercell composite
3.0

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.

IssuedProductOfficeCountiesLasted
Jul 22, 7:28 PM CDTMesoscale DiscussionSPCArkansas, Bradley, Calhoun, Clark, Cleburne, Cleveland and 29 more62 min
Jul 23, 2:56 PM CDTMesoscale DiscussionSPCBenton2 hr
Jul 23, 3:02 PM CDTSevere Thunderstorm WatchSPCBaxter, Benton, Boone, Calhoun, Carroll, Clark and 37 more7 hr
Jul 23, 7:46 AM CDTMesoscale DiscussionSPCAndrew, Atchison, Buchanan, Caldwell, Clay, Clinton and 10 more89 min
Jul 22, 8:48 PM CDTMesoscale DiscussionSPCAlfalfa, Garfield, Grant, Harper, Noble, Woods57 min
Jul 23, 4:56 PM CDTMesoscale DiscussionSPCBryan, Choctaw, McCurtain, Pushmataha2 hr
Jul 23, 5:15 PM CDTSevere Thunderstorm WatchSPCAdair, Alfalfa, Blaine, Cherokee, Craig, Creek and 29 more8 hr

Nearby

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