Alert archive / Arkansas / Mesoscale Discussions in 2012

Mesoscale Discussion 1056

June 4, 201219 counties in Arkansas; 6 parishes in Louisiana; 17 counties in Mississippi

The Storm Prediction Center issued this mesoscale discussion at Jun 4, 2012, 5:06 PM CDT for 19 counties in Arkansas; 6 parishes in Louisiana; 17 counties in Mississippi. It was in force for 114 min.

The area

The outline as issued.

The facts

Issued
Jun 4, 2012, 5:06 PM CDT (22:06 UTC)
Expired
Jun 4, 2012, 7:00 PM CDT
In force
114 min
Issued by
the Storm Prediction Center
Chance of a watch
40%
All 42 counties

Arkansas County, AR, Ashley County, AR, Bradley County, AR, Calhoun County, AR, Chicot County, AR, Cleveland County, AR, Dallas County, AR, Desha County, AR, Drew County, AR, Grant County, AR, Jefferson County, AR, Lee County, AR, Lincoln County, AR, Monroe County, AR, Ouachita County, AR, Phillips County, AR, Prairie County, AR, St. Francis County, AR, Union County, AR, East Carroll Parish, LA, Madison Parish, LA, Morehouse Parish, LA, Richland Parish, LA, Union Parish, LA, West Carroll Parish, LA, Bolivar County, MS, Carroll County, MS, Coahoma County, MS, Hinds County, MS, Holmes County, MS, Humphreys County, MS, Issaquena County, MS, Leflore County, MS, Madison County, MS, Quitman County, MS, Sharkey County, MS, Sunflower County, MS, Tallahatchie County, MS, Tunica County, MS, Warren County, MS, Washington County, MS, Yazoo County, MS

The radar

The Little Rock radar (KLZK), 141 km from the middle of the area, began a volume at 22:08 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 (KSHV), launched 12:00Z, 10.1 hours before the alert went out and 259 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 12:00Z on 2012-06-04Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 887 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 12:00Z on 2012-06-04The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -48 square meters per square second.1939Sfc1 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
887 J/kg
Mixed-layer CIN
-303 J/kg
Mixed-layer LCL
1029 m above ground
0-6 km bulk shear
7 kt
0-1 km storm-relative helicity
-48 m²/s²
0-3 km storm-relative helicity
14 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.

IssuedProductOfficeCountiesLasted
Jun 3, 7:09 PM CDTTornado WatchSPCClay, Craighead, Crittenden, Cross, Greene, Lawrence and 5 more7 hr
Jun 3, 7:47 PM CDTMesoscale DiscussionSPCBenton, Carroll, Washington58 min
Jun 3, 8:34 PM CDTMesoscale DiscussionSPCClay, Craighead, Crittenden, Cross, Faulkner, Greene and 6 more56 min
Jun 3, 11:25 PM CDTSevere Thunderstorm WatchSPCBenton, Carroll, Crawford, Franklin, Madison, Sebastian and 1 more8 hr
Jun 4, 1:51 AM CDTMesoscale DiscussionSPCBenton, Crawford, Madison, Washington54 min
Jun 4, 3:14 AM CDTMesoscale DiscussionSPCCrittenden91 min
Jun 4, 3:39 AM CDTMesoscale DiscussionSPCCleburne, Conway, Crawford, Faulkner, Franklin, Johnson and 6 more96 min
Jun 4, 1:07 PM CDTMesoscale DiscussionSPCArkansas, Bradley, Calhoun, Cleburne, Cleveland, Conway and 19 more113 min
Jun 3, 11:13 PM CDTMesoscale DiscussionSPCAlcorn, Benton, Itawamba, Lee, Prentiss, Tippah and 2 more62 min

Nearby

Mesoscale Discussions in Arkansas, 2012Mesoscale Discussions in Mississippi, 2012Mesoscale Discussions in Louisiana, 2012Every mesoscale discussion in 2012

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.