Alert archive / Mississippi / Mesoscale Discussions in 2003

Mesoscale Discussion 115

February 21, 20034 states

The Storm Prediction Center issued this mesoscale discussion at Feb 21, 2003, 7:26 PM CST for 4 states. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued
Feb 21, 2003, 7:26 PM CST (01:26 UTC)
Expired
Feb 21, 2003, 9:30 PM CST
In force
2 hr
Issued by
the Storm Prediction Center
All 43 counties

Baldwin County, AL, Clarke County, AL, Mobile County, AL, Washington County, AL, Escambia County, FL, Ascension Parish, LA, Assumption Parish, LA, East Baton Rouge Parish, LA, East Feliciana Parish, LA, Livingston Parish, LA, Orleans Parish, LA, Saint Bernard Parish, LA, Saint Charles Parish, LA, Saint Helena Parish, LA, Saint James Parish, LA, Saint John the Baptist Parish, LA, Saint Tammany Parish, LA, Tangipahoa Parish, LA, Washington Parish, LA, West Baton Rouge Parish, LA, Amite County, MS, Covington County, MS, Forrest County, MS, Franklin County, MS, George County, MS, Greene County, MS, Hancock County, MS, Harrison County, MS, Jackson County, MS, Jefferson Davis County, MS, Jones County, MS, Lamar County, MS, Lawrence County, MS, Lincoln County, MS, Marion County, MS, Pearl River County, MS, Perry County, MS, Pike County, MS, Simpson County, MS, Smith County, MS, Stone County, MS, Walthall County, MS, Wayne County, MS

The watches that followed

Watches SPC issued over any of the same counties within four hours of this discussion.

The nearest sounding before it

Slidell Radar S, LA (KSIL), launched 00:00Z, 1.4 hours before the alert went out and 56 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, Slidell Radar S, LA at 00:00Z on 2003-02-22Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 199 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, Slidell Radar S, LA at 00:00Z on 2003-02-22The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 440 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
199 J/kg
Mixed-layer CIN
-82 J/kg
Mixed-layer LCL
458 m above ground
0-6 km bulk shear
59 kt
0-1 km storm-relative helicity
440 m²/s²
0-3 km storm-relative helicity
510 m²/s²
Significant tornado parameter
0.0
Supercell composite
5.9

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
Feb 21, 8:15 PM CSTTornado WatchSPCBaldwin, Butler, Clarke, Conecuh, Covington, Crenshaw and 4 more6 hr
Feb 21, 9:03 PM CSTMesoscale DiscussionSPCAutauga, Bibb, Blount, Chilton, Choctaw, Coosa and 22 more3 hr
Feb 21, 9:30 PM CSTSevere Thunderstorm WatchSPCAutauga, Bibb, Calhoun, Chilton, Choctaw, Clay and 20 more7 hr
Feb 21, 10:22 PM CSTMesoscale DiscussionSPCBaldwin, Butler, Clarke, Conecuh, Covington, Crenshaw and 4 more113 min
Feb 21, 10:40 PM CSTMesoscale DiscussionSPCAutauga, Bibb, Calhoun, Chilton, Choctaw, Clay and 20 more2 hr
Feb 21, 11:14 PM CSTMesoscale DiscussionSPCBlount, Calhoun, Cherokee, Cleburne, Cullman, DeKalb and 16 more4 hr
Feb 21, 11:40 PM CSTTornado WatchSPCBarbour, Bullock, Coffee, Dale, Geneva, Henry and 5 more6 hr
Feb 22, 12:35 AM CSTTornado WatchSPCAutauga, Baldwin, Bibb, Bullock, Butler, Calhoun and 37 more5 hr
Feb 22, 2:47 AM CSTMesoscale DiscussionSPCCalhoun, Cherokee, Cleburne, DeKalb, Etowah, Jackson and 4 more3 hr
Feb 22, 3:35 AM CSTTornado WatchSPCBlount, Calhoun, Chambers, Cherokee, Chilton, Clay and 12 more2 hr
Feb 22, 3:51 AM CSTMesoscale DiscussionSPCAutauga, Baldwin, Barbour, Bibb, Bullock, Butler and 43 more114 min
Feb 22, 5:19 AM CSTMesoscale DiscussionSPCBarbour, Henry, Houston, Russell56 min
Feb 22, 5:50 AM CSTTornado WatchSPCHenry, Houston5 hr
Feb 22, 9:14 AM CSTMesoscale DiscussionSPCDeKalb, Jackson, Marshall2 hr
Feb 22, 10:35 AM CSTTornado WatchSPCDeKalb, Jackson5 hr
Feb 21, 6:18 PM CSTMesoscale DiscussionSPCBaker, Bradford, Clay, Columbia, Duval, Hamilton and 7 more3 hr
Feb 22, 9:59 AM CSTMesoscale DiscussionSPCBaker, Duval, Nassau61 min
Feb 22, 10:55 AM CSTTornado WatchSPCAlachua, Baker, Bradford, Clay, Columbia, Duval and 6 more5 hr
Feb 22, 11:55 AM CSTMesoscale DiscussionSPCBrevard, Charlotte, DeSoto, Glades, Hardee, Highlands and 11 more3 hr
Feb 22, 12:33 PM CSTMesoscale DiscussionSPCBrevard, Charlotte, DeSoto, Dixie, Glades, Hardee and 13 more117 min
Feb 22, 12:49 PM CSTMesoscale DiscussionSPCAlachua, Bradford, Clay, Duval, Nassau, Putnam and 1 more116 min
Feb 22, 2:48 PM CSTMesoscale DiscussionSPCBrevard, Charlotte, DeSoto, Flagler, Hardee, Highlands and 14 more27 min
Feb 21, 10:54 PM CSTMesoscale DiscussionSPCBeauregard, Bienville, Bossier, Caddo, De Soto, Natchitoches and 4 more3 hr
Feb 22, 2:02 AM CSTMesoscale DiscussionSPCCaldwell, Catahoula, Concordia, East Carroll, Franklin, LaSalle and 6 more3 hr

Nearby

Mesoscale Discussions in Mississippi, 2003Mesoscale Discussions in Louisiana, 2003Mesoscale Discussions in Alabama, 2003Every mesoscale discussion in 2003

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.