Alert archive / Mississippi / Mesoscale Discussions in 2009

Mesoscale Discussion 686

May 3, 20094 states

The Storm Prediction Center issued this mesoscale discussion at May 3, 2009, 9:24 AM CDT for 4 states. It was in force for 66 min.

The area

The outline as issued.

The facts

Issued
May 3, 2009, 9:24 AM CDT (14:24 UTC)
Expired
May 3, 2009, 10:30 AM CDT
In force
66 min
Issued by
the Storm Prediction Center
All 95 counties

Choctaw County, AL, Greene County, AL, Hale County, AL, Lamar County, AL, Marengo County, AL, Perry County, AL, Pickens County, AL, Sumter County, AL, Tuscaloosa County, AL, Acadia Parish, LA, Allen Parish, LA, Avoyelles Parish, LA, Beauregard Parish, LA, Calcasieu Parish, LA, Caldwell Parish, LA, Catahoula Parish, LA, Concordia Parish, LA, East Baton Rouge Parish, LA, East Carroll Parish, LA, East Feliciana Parish, LA, Evangeline Parish, LA, Franklin Parish, LA, Grant Parish, LA, Iberville Parish, LA, Jackson Parish, LA, Jefferson Davis Parish, LA, Lafayette Parish, LA, LaSalle Parish, LA, Livingston Parish, LA, Madison Parish, LA, Natchitoches Parish, LA, Pointe Coupee Parish, LA, Rapides Parish, LA, Richland Parish, LA, Sabine Parish, LA, Saint Helena Parish, LA, Saint Landry Parish, LA, Saint Martin Parish, LA, Tangipahoa Parish, LA, Tensas Parish, LA, Vernon Parish, LA, Washington Parish, LA, West Baton Rouge Parish, LA, West Feliciana Parish, LA, Winn Parish, LA, Adams County, MS, Amite County, MS, Attala County, MS, Choctaw County, MS, Claiborne County, MS, Clarke County, MS, Copiah County, MS, Covington County, MS, Franklin County, MS, Hinds County, MS, Holmes County, MS, Issaquena County, MS, Jasper County, MS, Jefferson County, MS, Jefferson Davis County, MS, Jones County, MS, Kemper County, MS, Lamar County, MS, Lauderdale County, MS, Lawrence County, MS, Leake County, MS, Lincoln County, MS, Lowndes County, MS, Madison County, MS, Marion County, MS, Neshoba County, MS, Newton County, MS, Noxubee County, MS, Oktibbeha County, MS, Pike County, MS, Rankin County, MS, Scott County, MS, Sharkey County, MS, Simpson County, MS, Smith County, MS, Walthall County, MS, Warren County, MS, Wayne County, MS, Wilkinson County, MS, Winston County, MS, Yazoo County, MS, Chambers County, TX, Hardin County, TX, Jasper County, TX, Jefferson County, TX, Newton County, TX, Orange County, TX, Sabine County, TX, San Augustine County, TX, Tyler County, TX

The nearest sounding before it

Jackson, MS (KJAN), launched 12:00Z, 2.4 hours before the alert went out and 167 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, Jackson, MS at 12:00Z on 2009-05-03Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1741 joules per kilogram.LCLEL10008507005003002001001 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, Jackson, MS at 12:00Z on 2009-05-03The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 200 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
1741 J/kg
Mixed-layer CIN
0 J/kg
Mixed-layer LCL
484 m above ground
0-6 km bulk shear
61 kt
0-1 km storm-relative helicity
200 m²/s²
0-3 km storm-relative helicity
237 m²/s²
Significant tornado parameter
2.4
Supercell composite
9.4

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 2, 7:30 PM CDTMesoscale DiscussionSPCBibb, Blount, Calhoun, Clay, Cullman, Etowah and 12 more60 min
May 2, 8:43 PM CDTTornado WatchSPCBibb, Blount, Chilton, Fayette, Greene, Hale and 9 more6 hr
May 2, 10:40 PM CDTMesoscale DiscussionSPCBibb, Greene, Hale, Jefferson, Pickens, Tuscaloosa2 hr
May 3, 7:18 AM CDTMesoscale DiscussionSPCBibb, Chilton, Fayette, Greene, Hale, Jefferson and 6 more57 min
May 3, 7:44 AM CDTSevere Thunderstorm WatchSPCBibb, Chilton, Fayette, Greene, Hale, Jefferson and 8 more8 hr
May 3, 10:56 AM CDTMesoscale DiscussionSPCAutauga, Barbour, Bibb, Bullock, Butler, Calhoun and 39 more64 min
May 3, 11:35 AM CDTSevere Thunderstorm WatchSPCAutauga, Baldwin, Barbour, Blount, Bullock, Butler and 29 more5 hr
May 3, 1:49 PM CDTMesoscale DiscussionSPCAutauga, Bibb, Bullock, Butler, Calhoun, Chambers and 22 more56 min
May 3, 3:11 PM CDTSevere Thunderstorm WatchSPCCoffee, Dale, Geneva, Henry, Houston3 hr
May 3, 3:13 PM CDTMesoscale DiscussionSPCBarbour, Bullock, Calhoun, Chambers, Cherokee, Clay and 16 more62 min
May 3, 5:36 PM CDTMesoscale DiscussionSPCHenry84 min
May 2, 7:38 PM CDTMesoscale DiscussionSPCBienville, Bossier, Caddo, Claiborne, Lincoln, Morehouse and 5 more97 min
May 2, 11:43 PM CDTSevere Thunderstorm WatchSPCBossier, Caddo, Claiborne, Lincoln, Ouachita, Union and 1 more5 hr
May 3, 2:39 AM CDTMesoscale DiscussionSPCBienville, Bossier, Caddo, Caldwell, Catahoula, Claiborne and 19 more2 hr
May 3, 5:12 AM CDTSevere Thunderstorm WatchSPCBeauregard, Bienville, Bossier, Caddo, Caldwell, Claiborne and 14 more7 hr
May 3, 6:54 AM CDTMesoscale DiscussionSPCAcadia, Allen, Avoyelles, Beauregard, Bienville, Caddo and 25 more2 hr
May 2, 8:04 PM CDTMesoscale DiscussionSPCBorden, Callahan, Coleman, Comanche, Dawson, Eastland and 21 more86 min
May 2, 9:59 PM CDTMesoscale DiscussionSPCBowie, Cass, Delta, Fannin, Franklin, Hopkins and 5 more3 hr
May 3, 3:02 AM CDTMesoscale DiscussionSPCAnderson, Bell, Bosque, Brown, Burnet, Collin and 28 more118 min

Nearby

Mesoscale Discussions in Mississippi, 2009Mesoscale Discussions in Louisiana, 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.