Alert archive / Arkansas / Mesoscale Discussions in 2011

Mesoscale Discussion 127

February 24, 20114 states

The Storm Prediction Center issued this mesoscale discussion at Feb 24, 2011, 2:39 PM CST for 4 states. It was in force for 66 min.

The area

The outline as issued.

The facts

Issued
Feb 24, 2011, 2:39 PM CST (20:39 UTC)
Expired
Feb 24, 2011, 3:45 PM CST
In force
66 min
Issued by
the Storm Prediction Center
All 63 counties

Bradley County, AR, Calhoun County, AR, Clark County, AR, Cleburne County, AR, Cleveland County, AR, Columbia County, AR, Conway County, AR, Crawford County, AR, Dallas County, AR, Faulkner County, AR, Franklin County, AR, Garland County, AR, Grant County, AR, Hempstead County, AR, Hot Spring County, AR, Howard County, AR, Jefferson County, AR, Johnson County, AR, Lafayette County, AR, Little River County, AR, Logan County, AR, Miller County, AR, Montgomery County, AR, Nevada County, AR, Ouachita County, AR, Perry County, AR, Pike County, AR, Polk County, AR, Pope County, AR, Pulaski County, AR, Saline County, AR, Scott County, AR, Sebastian County, AR, Sevier County, AR, Union County, AR, Van Buren County, AR, Yell County, AR, Bienville Parish, LA, Bossier Parish, LA, Caddo Parish, LA, Claiborne Parish, LA, Jackson Parish, LA, Lincoln Parish, LA, Ouachita Parish, LA, Union Parish, LA, Webster Parish, LA, Haskell County, OK, Latimer County, OK, LeFlore County, OK, McCurtain County, OK, Muskogee County, OK, Sequoyah County, OK, Bowie County, TX, Camp County, TX, Cass County, TX, Franklin County, TX, Gregg County, TX, Harrison County, TX, Marion County, TX, Morris County, TX, Red River County, TX, Titus County, TX, Upshur County, TX

The radar

The Shreveport radar (KSHV), 128 km from the middle of the area, began a volume at 20:40 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

Shreveport, LA (KSHV), launched 12:00Z, 8.7 hours before the alert went out and 126 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 2011-02-24Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 36 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 2011-02-24The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 243 square meters per square second.1939587897Sfc1 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
36 J/kg
Mixed-layer CIN
-228 J/kg
Mixed-layer LCL
741 m above ground
0-6 km bulk shear
60 kt
0-1 km storm-relative helicity
243 m²/s²
0-3 km storm-relative helicity
282 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
Feb 24, 10:34 AM CSTMesoscale DiscussionSPCGarland, Hempstead, Howard, Lafayette, Little River, Miller and 7 more56 min
Feb 24, 11:25 AM CSTTornado WatchSPCBradley, Calhoun, Clark, Cleburne, Cleveland, Columbia and 38 more9 hr
Feb 24, 2:12 PM CSTMesoscale DiscussionSPCCrittenden, Cross, Lee, Mississippi, Phillips, Poinsett and 1 more93 min
Feb 24, 2:34 PM CSTTornado WatchSPCArkansas, Ashley, Chicot, Clay, Craighead, Crittenden and 14 more7 hr
Feb 24, 5:26 PM CSTMesoscale DiscussionSPCArkansas, Ashley, Bradley, Calhoun, Chicot, Clark and 39 more94 min
Feb 23, 8:43 PM CSTMesoscale DiscussionSPCCraig, Nowata, Osage, Ottawa, Pawnee, Rogers and 1 more62 min
Feb 24, 3:07 AM CSTMesoscale DiscussionSPCAlfalfa, Beckham, Blaine, Caddo, Canadian, Custer and 17 more113 min
Feb 24, 4:10 AM CSTSevere Thunderstorm WatchSPCBeckham, Caddo, Canadian, Carter, Cleveland, Comanche and 17 more7 hr
Feb 24, 7:47 AM CSTMesoscale DiscussionSPCCleveland, Cotton, Garvin, Grady, Jefferson, McClain and 3 more118 min

Nearby

Mesoscale Discussions in Arkansas, 2011Mesoscale Discussions in Texas, 2011Mesoscale Discussions in Louisiana, 2011Every mesoscale discussion in 2011

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.