Alert archive / Arkansas / Mesoscale Discussions in 2015

Mesoscale Discussion 599

May 10, 20154 states

The Storm Prediction Center issued this mesoscale discussion at May 10, 2015, 7:08 PM CDT for 4 states. It was in force for 97 min.

The area

The outline as issued.

The facts

Issued
May 10, 2015, 7:08 PM CDT (00:08 UTC)
Expired
May 10, 2015, 8:45 PM CDT
In force
97 min
Issued by
the Storm Prediction Center
All 44 counties

Clark County, AR, Columbia County, AR, Dallas County, AR, Faulkner County, AR, Garland County, AR, Grant County, AR, Hempstead County, AR, Hot Spring County, AR, Howard County, AR, Lafayette County, AR, Little River County, AR, Lonoke County, AR, Miller County, AR, Montgomery County, AR, Nevada County, AR, Ouachita County, AR, Perry County, AR, Pike County, AR, Polk County, AR, Pulaski County, AR, Saline County, AR, Scott County, AR, Sevier County, AR, Yell County, AR, Bossier Parish, LA, Caddo Parish, LA, Latimer County, OK, LeFlore County, OK, McCurtain County, OK, Bowie County, TX, Camp County, TX, Cass County, TX, Cherokee County, TX, Franklin County, TX, Gregg County, TX, Harrison County, TX, Marion County, TX, Morris County, TX, Panola County, TX, Red River County, TX, Rusk County, TX, Smith County, TX, Titus County, TX, Upshur County, TX

The radar

The Western Arkansas radar (KSRX), 158 km from the middle of the area, began a volume at 00:07 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

Shreveport, LA (KBAD), launched 00:00Z, 0.1 hours before the alert went out and 160 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, Shreveport, LA at 00:00Z on 2015-05-11Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 482 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, Shreveport, LA at 00:00Z on 2015-05-11The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 79 square meters per square second.19395878Sfc1 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
482 J/kg
Mixed-layer CIN
-35 J/kg
Mixed-layer LCL
1448 m above ground
0-6 km bulk shear
44 kt
0-1 km storm-relative helicity
79 m²/s²
0-3 km storm-relative helicity
72 m²/s²
Significant tornado parameter
0.1
Supercell composite
5.7

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
May 10, 7:34 PM CDTTornado WatchSPCClark, Dallas, Garland, Grant, Hempstead, Hot Spring and 13 more4 hr
May 10, 8:06 PM CDTMesoscale DiscussionSPCSebastian54 min
May 10, 9:57 PM CDTMesoscale DiscussionSPCClark, Columbia, Garland, Hempstead, Hot Spring, Howard and 12 more93 min
May 10, 11:31 PM CDTTornado WatchSPCArkansas, Bradley, Calhoun, Clark, Cleburne, Cleveland and 33 more5 hr
May 11, 2:55 AM CDTMesoscale DiscussionSPCSabine95 min
May 11, 12:30 PM CDTMesoscale DiscussionSPCAscension, Assumption, East Baton Rouge, East Feliciana, Iberia, Iberville and 18 more2 hr
May 11, 1:44 PM CDTMesoscale DiscussionSPCAscension, East Baton Rouge, East Feliciana, Iberville, Livingston, Saint Helena and 3 more2 hr
May 11, 2:31 AM CDTMesoscale DiscussionSPCEdwards, Kerr, Kimble, Real, Sutton, Val Verde89 min
May 11, 4:19 AM CDTSevere Thunderstorm WatchSPCBandera, Bastrop, Bexar, Blanco, Burnet, Caldwell and 18 more7 hr
May 11, 7:04 AM CDTMesoscale DiscussionSPCAustin, Bandera, Bastrop, Bexar, Blanco, Burleson and 34 more56 min
May 11, 2:16 PM CDTMesoscale DiscussionSPCAtascosa, Bee, Bexar, Colorado, DeWitt, Dimmit and 18 more119 min

Nearby

Mesoscale Discussions in Arkansas, 2015Mesoscale Discussions in Texas, 2015Mesoscale Discussions in Oklahoma, 2015Every mesoscale discussion in 2015

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.