Alert archive / Mississippi / Mesoscale Discussions in 2008

Mesoscale Discussion 251

February 17, 2008Mobile County, Alabama; 25 parishes in Louisiana; 33 counties in Mississippi

The Storm Prediction Center issued this mesoscale discussion at Feb 17, 2008, 2:13 AM CST for Mobile County, Alabama; 25 parishes in Louisiana; 33 counties in Mississippi. It was in force for 32 min.

The area

The outline as issued.

The facts

Issued
Feb 17, 2008, 2:13 AM CST (08:13 UTC)
Expired
Feb 17, 2008, 2:45 AM CST
In force
32 min
Issued by
the Storm Prediction Center
All 59 counties

Mobile County, AL, Ascension Parish, LA, Assumption Parish, LA, East Baton Rouge Parish, LA, East Feliciana Parish, LA, Iberia Parish, LA, Iberville Parish, LA, Jefferson Parish, LA, Lafourche Parish, LA, Livingston Parish, LA, Orleans Parish, LA, Plaquemines Parish, LA, Pointe Coupee 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 Martin Parish, LA, Saint Tammany Parish, LA, St. Mary Parish, LA, Tangipahoa Parish, LA, Terrebonne Parish, LA, Washington Parish, LA, West Baton Rouge Parish, LA, West Feliciana Parish, LA, Adams County, MS, Amite County, MS, Claiborne County, MS, Clarke County, MS, Copiah County, MS, Covington County, MS, Forrest County, MS, Franklin County, MS, George County, MS, Greene County, MS, Hancock County, MS, Harrison County, MS, Hinds County, MS, Jackson County, MS, Jasper County, MS, Jefferson 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, Rankin County, MS, Simpson County, MS, Smith County, MS, Stone County, MS, Walthall County, MS, Warren County, MS, Wayne County, MS, Wilkinson 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, 8.2 hours before the alert went out and 85 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 2008-02-17Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 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 2008-02-17The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 122 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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
1066 m above ground
0-6 km bulk shear
46 kt
0-1 km storm-relative helicity
122 m²/s²
0-3 km storm-relative helicity
292 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
Feb 17, 4:19 AM CSTMesoscale DiscussionSPCColbert, Franklin, Lamar, Marion, Pickens56 min
Feb 17, 5:05 AM CSTMesoscale DiscussionSPCBaldwin, Choctaw, Clarke, Conecuh, Dallas, Escambia and 8 more55 min
Feb 17, 5:26 AM CSTTornado WatchSPCAutauga, Baldwin, Butler, Choctaw, Clarke, Conecuh and 14 more7 hr
Feb 17, 7:13 AM CSTMesoscale DiscussionSPCAutauga, Baldwin, Butler, Chilton, Choctaw, Clarke and 16 more62 min
Feb 17, 9:43 AM CSTMesoscale DiscussionSPCAutauga, Baldwin, Butler, Chilton, Choctaw, Clarke and 17 more62 min
Feb 17, 12:14 PM CSTMesoscale DiscussionSPCAutauga, Barbour, Bullock, Chambers, Clay, Coffee and 16 more91 min
Feb 17, 12:32 PM CSTTornado WatchSPCAutauga, Baldwin, Barbour, Bullock, Butler, Chambers and 28 more7 hr
Feb 17, 2:45 PM CSTMesoscale DiscussionSPCAutauga, Baldwin, Barbour, Bullock, Butler, Chambers and 22 more90 min
Feb 17, 5:19 PM CSTMesoscale DiscussionSPCChambers, Dale, Geneva, Henry, Houston86 min
Feb 16, 7:18 PM CSTMesoscale DiscussionSPCAllen, Beauregard, Calcasieu, Cameron, De Soto, Jefferson Davis and 4 more87 min
Feb 16, 8:25 PM CSTTornado WatchSPCAcadia, Allen, Beauregard, Calcasieu, Cameron, Evangeline and 4 more6 hr
Feb 16, 10:41 PM CSTMesoscale DiscussionSPCAcadia, Allen, Avoyelles, Beauregard, Calcasieu, Caldwell and 26 more94 min
Feb 16, 11:30 PM CSTSevere Thunderstorm WatchSPCAscension, Assumption, Avoyelles, Caldwell, Catahoula, Concordia and 25 more6 hr
Feb 17, 1:33 AM CSTMesoscale DiscussionSPCAcadia, Allen, Cameron, Evangeline, Jefferson Davis, Rapides and 1 more57 min
Feb 17, 2:45 AM CSTTornado WatchSPCAscension, Assumption, East Baton Rouge, East Feliciana, Iberia, Iberville and 19 more5 hr

Nearby

Mesoscale Discussions in Mississippi, 2008Mesoscale Discussions in Louisiana, 2008Mesoscale Discussions in Alabama, 2008Every mesoscale discussion in 2008

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.