Alert archive / Mississippi / Mesoscale Discussions in 2009

Mesoscale Discussion 726

May 6, 20095 states

The Storm Prediction Center issued this mesoscale discussion at May 6, 2009, 3:05 AM CDT for 5 states. It was in force for 115 min.

The area

The outline as issued.

The facts

Issued
May 6, 2009, 3:05 AM CDT (08:05 UTC)
Expired
May 6, 2009, 5:00 AM CDT
In force
115 min
Issued by
the Storm Prediction Center
All 59 counties

Fayette County, AL, Jefferson County, AL, Lamar County, AL, Marion County, AL, Pickens County, AL, Tuscaloosa County, AL, Walker County, AL, 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, Grant County, AR, Hempstead County, AR, Hot Spring County, AR, Howard County, AR, Lafayette County, AR, Lincoln County, AR, Little River County, AR, Miller County, AR, Nevada County, AR, Ouachita County, AR, Phillips County, AR, Pike County, AR, Sevier County, AR, Union County, AR, Bolivar County, MS, Calhoun County, MS, Carroll County, MS, Chickasaw County, MS, Choctaw County, MS, Clay County, MS, Coahoma County, MS, Grenada County, MS, Itawamba County, MS, Lafayette County, MS, Lee County, MS, Leflore County, MS, Lowndes County, MS, Monroe County, MS, Montgomery County, MS, Noxubee County, MS, Oktibbeha County, MS, Panola County, MS, Pontotoc County, MS, Quitman County, MS, Sunflower County, MS, Tallahatchie County, MS, Washington County, MS, Webster County, MS, Yalobusha County, MS, McCurtain County, OK, Bowie County, TX, Red River County, TX

The radar

The Little Rock radar (KLZK), 143 km from the middle of the area, began a volume at 08:08 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

Little Rock, AR (KLZK), launched 00:00Z, 8.1 hours before the alert went out and 172 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, Little Rock, AR at 00:00Z on 2009-05-06Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 3 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, Little Rock, AR at 00:00Z on 2009-05-06The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 61 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
3 J/kg
Mixed-layer CIN
-164 J/kg
Mixed-layer LCL
617 m above ground
0-6 km bulk shear
37 kt
0-1 km storm-relative helicity
61 m²/s²
0-3 km storm-relative helicity
89 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
May 5, 11:45 PM CDTMesoscale DiscussionSPCBlount, Calhoun, Colbert, Cullman, Etowah, Fayette and 13 more90 min
May 6, 1:27 AM CDTMesoscale DiscussionSPCBlount, Cullman, Fayette, Franklin, Jefferson, Lamar and 4 more3 hr
May 6, 4:03 AM CDTSevere Thunderstorm WatchSPCBibb, Blount, Calhoun, Cherokee, Clay, Cleburne and 27 more6 hr
May 6, 6:58 AM CDTMesoscale DiscussionSPCGreene, Pickens, Sumter3 hr
May 6, 7:22 AM CDTMesoscale DiscussionSPCBibb, Blount, Calhoun, Cherokee, Chilton, Clay and 28 more83 min
May 6, 9:04 AM CDTMesoscale DiscussionSPCAutauga, Bibb, Blount, Bullock, Butler, Calhoun and 27 more56 min
May 6, 9:27 AM CDTTornado WatchSPCAutauga, Barbour, Bibb, Blount, Bullock, Calhoun and 31 more9 hr
May 6, 12:37 PM CDTSevere Thunderstorm WatchSPCButler, Choctaw, Clarke, Conecuh, Covington, Crenshaw and 4 more6 hr
May 6, 1:57 PM CDTMesoscale DiscussionSPCBullock, Russell93 min
May 6, 4:47 PM CDTMesoscale DiscussionSPCDale, Geneva, Henry58 min
May 5, 10:07 PM CDTMesoscale DiscussionSPCArkansas, Calhoun, Clark, Cleveland, Conway, Crittenden and 28 more83 min
May 5, 10:27 PM CDTSevere Thunderstorm WatchSPCArkansas, Ashley, Bradley, Calhoun, Chicot, Clark and 49 more8 hr
May 5, 11:26 PM CDTSevere Thunderstorm WatchSPCSebastian6 hr
May 6, 12:53 AM CDTMesoscale DiscussionSPCArkansas, Bradley, Calhoun, Clark, Cleveland, Dallas and 14 more37 min
May 6, 12:54 AM CDTTornado WatchSPCArkansas, Ashley, Bradley, Calhoun, Chicot, Clark and 20 more5 hr
May 6, 2:00 AM CDTMesoscale DiscussionSPCSebastian2 hr
May 6, 2:26 AM CDTMesoscale DiscussionSPCCleburne, Conway, Craighead, Crittenden, Cross, Faulkner and 23 more2 hr
May 6, 5:29 AM CDTSevere Thunderstorm WatchSPCColumbia, Hempstead, Howard, Lafayette, Little River, Miller and 3 more8 hr
May 6, 5:45 AM CDTSevere Thunderstorm WatchSPCAshley, Bradley, Calhoun, Chicot, Cleveland, Desha and 3 more7 hr
May 6, 11:34 AM CDTMesoscale DiscussionSPCAdams, Claiborne, Copiah, Covington, Franklin, Hinds and 11 more86 min
May 5, 11:03 PM CDTMesoscale DiscussionSPCAtoka, Bryan, Carter, Choctaw, Coal, Cotton and 12 more117 min
May 6, 5:08 AM CDTMesoscale DiscussionSPCBryan, Carter, Choctaw, Cotton, Jefferson, Johnston and 2 more97 min
May 5, 7:19 PM CDTMesoscale DiscussionSPCBosque, Brown, Callahan, Coke, Coleman, Comanche and 19 more86 min
May 5, 9:14 PM CDTMesoscale DiscussionSPCArcher, Baylor, Bosque, Brown, Callahan, Coleman and 24 more31 min

Nearby

Mesoscale Discussions in Mississippi, 2009Mesoscale Discussions in Arkansas, 2009Mesoscale Discussions in Alabama, 2009Every mesoscale discussion in 2009

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.