Alert archive / Mississippi / Mesoscale Discussions in 2007

Mesoscale Discussion 2104

October 18, 20075 states

The Storm Prediction Center issued this mesoscale discussion at Oct 18, 2007, 12:27 AM CDT for 5 states. It was in force for 93 min.

The area

The outline as issued.

The facts

Issued
Oct 18, 2007, 12:27 AM CDT (05:27 UTC)
Expired
Oct 18, 2007, 2:00 AM CDT
In force
93 min
Issued by
the Storm Prediction Center
All 73 counties

Craighead County, AR, Crittenden County, AR, Cross County, AR, Lee County, AR, Mississippi County, AR, Phillips County, AR, Poinsett County, AR, St. Francis County, AR, Ballard County, KY, Calloway County, KY, Carlisle County, KY, Fulton County, KY, Graves County, KY, Hickman County, KY, Livingston County, KY, Marshall County, KY, McCracken County, KY, Dunklin County, MO, Mississippi County, MO, New Madrid County, MO, Pemiscot County, MO, Alcorn County, MS, Attala County, MS, Benton County, MS, Bolivar County, MS, Calhoun County, MS, Carroll County, MS, Chickasaw County, MS, Choctaw County, MS, Clay County, MS, Coahoma County, MS, DeSoto County, MS, Grenada County, MS, Holmes County, MS, Humphreys County, MS, Lafayette County, MS, Lee County, MS, Leflore County, MS, Marshall County, MS, Montgomery County, MS, Oktibbeha County, MS, Panola County, MS, Pontotoc County, MS, Prentiss County, MS, Quitman County, MS, Sunflower County, MS, Tallahatchie County, MS, Tate County, MS, Tippah County, MS, Tunica County, MS, Union County, MS, Webster County, MS, Winston County, MS, Yalobusha County, MS, Yazoo County, MS, Carroll County, TN, Chester County, TN, Crockett County, TN, Dyer County, TN, Fayette County, TN, Gibson County, TN, Hardeman County, TN, Haywood County, TN, Henderson County, TN, Henry County, TN, Lake County, TN, Lauderdale County, TN, Madison County, TN, McNairy County, TN, Obion County, TN, Shelby County, TN, Tipton County, TN, Weakley County, TN

The radar

The Memphis radar (KNQA), 24 km from the middle of the area, began a volume at 05:29 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, 5.5 hours before the alert went out and 47 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 2007-10-18Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 18 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 2007-10-18The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 152 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
18 J/kg
Mixed-layer CIN
-168 J/kg
Mixed-layer LCL
1339 m above ground
0-6 km bulk shear
57 kt
0-1 km storm-relative helicity
152 m²/s²
0-3 km storm-relative helicity
207 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.6

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
Oct 17, 7:09 PM CDTTornado WatchSPCAshley, Chicot, Clay, Craighead, Crittenden, Cross and 8 more7 hr
Oct 17, 8:10 PM CDTMesoscale DiscussionSPCAshley, Baxter, Benton, Boone, Bradley, Calhoun and 48 more95 min
Oct 17, 10:56 PM CDTMesoscale DiscussionSPCArkansas, Baxter, Boone, Bradley, Calhoun, Carroll and 64 more64 min
Oct 17, 11:38 PM CDTTornado WatchSPCArkansas, Baxter, Boone, Bradley, Calhoun, Clark and 39 more3 hr
Oct 18, 1:31 AM CDTTornado WatchSPCClay, Craighead, Crittenden, Cross, Greene, Lawrence and 6 more4 hr
Oct 18, 2:02 AM CDTMesoscale DiscussionSPCArkansas, Baxter, Clay, Cleburne, Cleveland, Conway and 27 more58 min
Oct 18, 4:08 AM CDTMesoscale DiscussionSPCCraighead, Crittenden, Cross, Greene, Mississippi, Poinsett67 min
Oct 18, 1:31 PM CDTTornado WatchSPCClay, Craighead, Crittenden, Cross, Greene, Lee and 4 more9 hr
Oct 18, 5:39 PM CDTMesoscale DiscussionSPCCrittenden, Mississippi66 min
Oct 18, 2:27 AM CDTTornado WatchSPCBallard, Caldwell, Calloway, Carlisle, Christian, Crittenden and 16 more4 hr
Oct 18, 4:37 AM CDTTornado WatchSPCBreckinridge, Hancock, Jefferson, Meade, Ohio, Oldham and 1 more3 hr
Oct 18, 10:26 AM CDTMesoscale DiscussionSPCAdair, Allen, Anderson, Barren, Boyle, Breckinridge and 61 more2 hr
Oct 18, 1:44 PM CDTMesoscale DiscussionSPCHenderson, Union2 hr
Oct 18, 6:30 PM CDTMesoscale DiscussionSPCBath, Boone, Bourbon, Bracken, Campbell, Clark and 17 more90 min
Oct 18, 3:02 AM CDTMesoscale DiscussionSPCGreene, Wayne58 min
Oct 18, 3:52 PM CDTMesoscale DiscussionSPCGeorge83 min
Oct 17, 7:57 PM CDTMesoscale DiscussionSPCAdair, Audrain, Barry, Barton, Bates, Benton and 59 more63 min
Oct 17, 11:40 PM CDTTornado WatchSPCAudrain, Bollinger, Boone, Butler, Callaway, Cape Girardeau and 43 more4 hr

Nearby

Mesoscale Discussions in Mississippi, 2007Mesoscale Discussions in Tennessee, 2007Mesoscale Discussions in Kentucky, 2007Every mesoscale discussion in 2007

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.