Alert archive / Arkansas / Mesoscale Discussions in 2009

Mesoscale Discussion 2091

October 9, 20095 states

The Storm Prediction Center issued this mesoscale discussion at Oct 9, 2009, 2:38 AM CDT for 5 states. It was in force for 52 min.

The area

The outline as issued.

The facts

Issued
Oct 9, 2009, 2:38 AM CDT (07:38 UTC)
Expired
Oct 9, 2009, 3:30 AM CDT
In force
52 min
Issued by
the Storm Prediction Center
All 85 counties

Clark County, AR, Cleburne County, AR, Craighead County, AR, Crittenden County, AR, Cross County, AR, Faulkner County, AR, Garland County, AR, Grant County, AR, Greene County, AR, Hot Spring County, AR, Howard County, AR, Independence County, AR, Jackson County, AR, Lawrence County, AR, Lee County, AR, Lonoke County, AR, Mississippi County, AR, Monroe County, AR, Montgomery County, AR, Perry County, AR, Pike County, AR, Poinsett County, AR, Polk County, AR, Prairie County, AR, Pulaski County, AR, Saline County, AR, St. Francis County, AR, White County, AR, Woodruff County, AR, Yell County, AR, Allen County, KY, Barren County, KY, Breckinridge County, KY, Bullitt County, KY, Butler County, KY, Calloway County, KY, Christian County, KY, Edmonson County, KY, Fulton County, KY, Graves County, KY, Grayson County, KY, Hardin County, KY, Hart County, KY, Hickman County, KY, Larue County, KY, Logan County, KY, Marshall County, KY, Muhlenberg County, KY, Nelson County, KY, Ohio County, KY, Simpson County, KY, Spencer County, KY, Todd County, KY, Trigg County, KY, Warren County, KY, Dunklin County, MO, Pemiscot County, MO, DeSoto County, MS, Benton County, TN, Carroll County, TN, Cheatham County, TN, Chester County, TN, Crockett County, TN, Davidson County, TN, Decatur County, TN, Dickson County, TN, Dyer County, TN, Fayette County, TN, Gibson County, TN, Haywood County, TN, Henderson County, TN, Henry County, TN, Houston County, TN, Humphreys County, TN, Lake County, TN, Lauderdale County, TN, Madison County, TN, Montgomery County, TN, Obion County, TN, Robertson County, TN, Shelby County, TN, Stewart County, TN, Sumner County, TN, Tipton County, TN, Weakley County, TN

The radar

The Memphis radar (KNQA), 54 km from the middle of the area, began a volume at 07:41 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

Nashville Metro, TN (KBNA), launched 00:00Z, 7.6 hours before the alert went out and 309 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, Nashville Metro, TN at 00:00Z on 2009-10-09Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1054 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, Nashville Metro, TN at 00:00Z on 2009-10-09The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 292 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
1054 J/kg
Mixed-layer CIN
-4 J/kg
Mixed-layer LCL
757 m above ground
0-6 km bulk shear
47 kt
0-1 km storm-relative helicity
292 m²/s²
0-3 km storm-relative helicity
351 m²/s²
Significant tornado parameter
1.7
Supercell composite
7.0

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
Oct 8, 7:35 PM CDTMesoscale DiscussionSPCBaxter, Boone, Clay, Cleburne, Conway, Craighead and 15 more55 min
Oct 8, 8:00 PM CDTTornado WatchSPCBaxter, Boone, Clay, Cleburne, Conway, Craighead and 23 more7 hr
Oct 8, 11:06 PM CDTMesoscale DiscussionSPCBaxter, Clay, Cleburne, Conway, Craighead, Faulkner and 17 more84 min
Oct 8, 11:40 PM CDTMesoscale DiscussionSPCCrawford, Sebastian95 min
Oct 9, 6:59 AM CDTMesoscale DiscussionSPCArkansas, Ashley, Bradley, Calhoun, Clark, Cleveland and 14 more3 hr
Oct 9, 8:24 AM CDTMesoscale DiscussionSPCArkansas, Ashley, Bradley, Calhoun, Chicot, Cleveland and 7 more66 min
Oct 9, 8:36 AM CDTTornado WatchSPCArkansas, Ashley, Bradley, Calhoun, Chicot, Cleveland and 11 more4 hr
Oct 9, 10:45 AM CDTMesoscale DiscussionSPCChicot, Desha90 min
Oct 9, 12:08 PM CDTMesoscale DiscussionSPCAdair, Allen, Barren, Boyle, Casey, Clinton and 23 more67 min
Oct 9, 12:24 PM CDTTornado WatchSPCAdair, Allen, Barren, Casey, Clinton, Cumberland and 11 more7 hr
Oct 9, 2:17 PM CDTTornado WatchSPCBell, Boyd, Breathitt, Carter, Clay, Elliott and 28 more4 hr
Oct 9, 2:39 PM CDTMesoscale DiscussionSPCBell, Breathitt, Carter, Clay, Clinton, Cumberland and 30 more96 min
Oct 9, 4:52 PM CDTMesoscale DiscussionSPCBell, Breathitt, Clay, Floyd, Harlan, Johnson and 13 more83 min
Oct 9, 11:26 AM CDTTornado WatchSPCAlcorn, Attala, Benton, Calhoun, Carroll, Chickasaw and 27 more5 hr
Oct 9, 1:41 PM CDTMesoscale DiscussionSPCAttala, Chickasaw, Choctaw, Clay, Itawamba, Kemper and 9 more94 min
Oct 9, 3:27 PM CDTTornado WatchSPCAnderson, Bledsoe, Blount, Bradley, Campbell, Carter and 27 more6 hr
Oct 9, 6:13 PM CDTMesoscale DiscussionSPCBlount, Bradley, Carter, Cocke, Grainger, Greene and 16 more62 min

Nearby

Mesoscale Discussions in Arkansas, 2009Mesoscale Discussions in Tennessee, 2009Mesoscale Discussions in Kentucky, 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.