Alert archive / Arkansas / Mesoscale Discussions in 2008

Mesoscale Discussion 405

March 14, 20084 states

The Storm Prediction Center issued this mesoscale discussion at Mar 14, 2008, 9:50 PM CDT for 4 states. It was in force for 55 min.

The area

The outline as issued.

The facts

Issued
Mar 14, 2008, 9:50 PM CDT (02:50 UTC)
Expired
Mar 14, 2008, 10:45 PM CDT
In force
55 min
Issued by
the Storm Prediction Center
All 56 counties

Arkansas County, AR, Ashley County, AR, Bradley County, AR, Calhoun County, AR, Chicot County, AR, Clark County, AR, Cleveland County, AR, Columbia County, AR, Dallas County, AR, Desha County, AR, Drew County, AR, Garland County, AR, Grant County, AR, Hempstead County, AR, Hot Spring County, AR, Howard County, AR, Jefferson County, AR, Lafayette County, AR, Lincoln County, AR, Little River County, AR, Miller County, AR, Montgomery County, AR, Nevada County, AR, Ouachita County, AR, Pike County, AR, Polk County, AR, Saline County, AR, Sevier County, AR, Union County, AR, Bienville Parish, LA, Bossier Parish, LA, Caddo Parish, LA, Caldwell Parish, LA, Claiborne Parish, LA, East Carroll Parish, LA, Franklin Parish, LA, Jackson Parish, LA, Lincoln Parish, LA, Madison Parish, LA, Morehouse Parish, LA, Ouachita Parish, LA, Richland Parish, LA, Tensas Parish, LA, Union Parish, LA, Webster Parish, LA, West Carroll Parish, LA, Bolivar County, MS, Claiborne County, MS, Humphreys County, MS, Issaquena County, MS, Sharkey County, MS, Sunflower County, MS, Warren County, MS, Washington County, MS, Bowie County, TX, Cass County, TX

The radar

The Shreveport radar (KSHV), 184 km from the middle of the area, began a volume at 02:53 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 00:00Z, 2.8 hours before the alert went out and 175 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 2008-03-15Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1478 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 2008-03-15The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 100 square meters per square second.1939587897117Sfc1 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
1478 J/kg
Mixed-layer CIN
-14 J/kg
Mixed-layer LCL
1885 m above ground
0-6 km bulk shear
63 kt
0-1 km storm-relative helicity
100 m²/s²
0-3 km storm-relative helicity
250 m²/s²
Significant tornado parameter
0.2
Supercell composite
9.9

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
Mar 14, 7:14 PM CDTTornado WatchSPCArkansas, Ashley, Bradley, Calhoun, Chicot, Clark and 22 more7 hr
Mar 14, 8:01 PM CDTMesoscale DiscussionSPCBenton, Washington29 min
Mar 14, 8:17 PM CDTSevere Thunderstorm WatchSPCBenton, Carroll, Crawford, Franklin, Madison, Sebastian and 1 more5 hr
Mar 14, 10:47 PM CDTMesoscale DiscussionSPCBaxter, Benton, Boone, Carroll, Cleburne, Conway and 29 more28 min
Mar 14, 11:24 PM CDTSevere Thunderstorm WatchSPCBaxter, Boone, Clay, Cleburne, Conway, Craighead and 32 more7 hr
Mar 14, 11:55 PM CDTMesoscale DiscussionSPCArkansas, Ashley, Bradley, Calhoun, Chicot, Clark and 15 more65 min
Mar 14, 11:55 PM CDTSevere Thunderstorm WatchSPCCrittenden, Mississippi7 hr
Mar 15, 2:12 AM CDTMesoscale DiscussionSPCArkansas, Baxter, Cleburne, Conway, Craighead, Crittenden and 26 more93 min
Mar 15, 4:30 AM CDTMesoscale DiscussionSPCArkansas, Grant, Hot Spring, Jefferson, Lee, Monroe and 2 more90 min
Mar 15, 10:23 AM CDTMesoscale DiscussionSPCClay, Craighead, Crittenden, Cross, Greene, Lee and 4 more67 min
Mar 14, 10:36 PM CDTMesoscale DiscussionSPCAttala, Calhoun, Carroll, Chickasaw, Choctaw, Clarke and 24 more84 min
Mar 14, 11:01 PM CDTTornado WatchSPCAttala, Calhoun, Carroll, Chickasaw, Choctaw, Clarke and 27 more3 hr
Mar 15, 1:47 AM CDTMesoscale DiscussionSPCAttala, Carroll, Choctaw, Clarke, Clay, Copiah and 25 more88 min
Mar 15, 6:58 AM CDTMesoscale DiscussionSPCTishomingo62 min

Nearby

Mesoscale Discussions in Arkansas, 2008Mesoscale Discussions in Louisiana, 2008Mesoscale Discussions in Mississippi, 2008Every mesoscale discussion in 2008

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.