Alert archive / Mississippi / Mesoscale Discussions in 2005

Mesoscale Discussion 2108

August 29, 20054 states

The Storm Prediction Center issued this mesoscale discussion at Aug 29, 2005, 1:26 AM CDT for 4 states. It was in force for 34 min.

The area

The outline as issued.

The facts

Issued
Aug 29, 2005, 1:26 AM CDT (06:26 UTC)
Expired
Aug 29, 2005, 2:00 AM CDT
In force
34 min
Issued by
the Storm Prediction Center
All 50 counties

Baldwin County, AL, Butler County, AL, Choctaw County, AL, Clarke County, AL, Coffee County, AL, Conecuh County, AL, Covington County, AL, Crenshaw County, AL, Escambia County, AL, Geneva County, AL, Mobile County, AL, Monroe County, AL, Washington County, AL, Wilcox County, AL, Bay County, FL, Calhoun County, FL, Escambia County, FL, Franklin County, FL, Gulf County, FL, Holmes County, FL, Okaloosa County, FL, Santa Rosa County, FL, Walton County, FL, Washington County, FL, Jefferson Parish, LA, Lafourche Parish, LA, Orleans Parish, LA, Plaquemines Parish, LA, Saint Bernard Parish, LA, Saint Charles Parish, LA, Saint John the Baptist Parish, LA, Saint Tammany Parish, LA, Tangipahoa Parish, LA, Terrebonne Parish, LA, Washington Parish, LA, Forrest County, MS, George County, MS, Greene County, MS, Hancock County, MS, Harrison County, MS, Jackson County, MS, Jones County, MS, Lamar County, MS, Marion County, MS, Pearl River County, MS, Perry County, MS, Pike County, MS, Stone County, MS, Walthall County, MS, Wayne County, MS

The radar

The Mobile radar (KMOB), 45 km from the middle of the area, began a volume at 06:29 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

Slidell Radar S, LA (KSIL), launched 00:00Z, 6.4 hours before the alert went out and 135 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 2005-08-29Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1069 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 2005-08-29The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 254 square meters per square second.193958Sfc1 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
1069 J/kg
Mixed-layer CIN
-28 J/kg
Mixed-layer LCL
802 m above ground
0-6 km bulk shear
23 kt
0-1 km storm-relative helicity
254 m²/s²
0-3 km storm-relative helicity
343 m²/s²
Significant tornado parameter
0.0
Supercell composite
4.6

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
Aug 28, 10:16 PM CDTMesoscale DiscussionSPCBaldwin, Butler, Clarke, Conecuh, Covington, Escambia and 3 more119 min
Aug 29, 2:00 AM CDTTornado WatchSPCBaldwin, Butler, Clarke, Conecuh, Covington, Crenshaw and 5 more8 hr
Aug 29, 6:33 AM CDTMesoscale DiscussionSPCBaldwin, Butler, Clarke, Conecuh, Covington, Escambia and 4 more117 min
Aug 29, 7:41 AM CDTMesoscale DiscussionSPCBarbour, Coffee, Dale, Geneva, Henry, Houston and 1 more94 min
Aug 29, 9:36 AM CDTMesoscale DiscussionSPCAutauga, Baldwin, Barbour, Bibb, Bullock, Butler and 37 more84 min
Aug 29, 10:25 AM CDTTornado WatchSPCAutauga, Baldwin, Barbour, Bibb, Bullock, Butler and 38 more8 hr
Aug 29, 1:04 PM CDTMesoscale DiscussionSPCAutauga, Baldwin, Barbour, Bibb, Bullock, Butler and 38 more86 min
Aug 29, 3:23 PM CDTMesoscale DiscussionSPCBlount, Calhoun, Cherokee, Colbert, Cullman, DeKalb and 15 more37 min
Aug 29, 3:25 PM CDTTornado WatchSPCBlount, Calhoun, Cherokee, Cleburne, Colbert, Cullman and 17 more3 hr
Aug 29, 5:42 PM CDTMesoscale DiscussionSPCBibb, Chilton, Colbert, Cullman, Fayette, Franklin and 11 more3 hr
Aug 29, 6:12 PM CDTMesoscale DiscussionSPCAutauga, Barbour, Bibb, Blount, Bullock, Butler and 49 more63 min
Aug 29, 6:40 PM CDTTornado WatchSPCAutauga, Barbour, Bibb, Blount, Bullock, Butler and 40 more10 hr

Nearby

Mesoscale Discussions in Mississippi, 2005Mesoscale Discussions in Alabama, 2005Mesoscale Discussions in Louisiana, 2005Every mesoscale discussion in 2005

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.