Alert archive / Louisiana / Mesoscale Discussions in 2005

Mesoscale Discussion 725

April 30, 20054 states

The Storm Prediction Center issued this mesoscale discussion at Apr 30, 2005, 11:02 AM CDT for 4 states. It was in force for 58 min.

The area

The outline as issued.

The facts

Issued
Apr 30, 2005, 11:02 AM CDT (16:02 UTC)
Expired
Apr 30, 2005, 12:00 PM CDT
In force
58 min
Issued by
the Storm Prediction Center
All 30 counties

Baldwin County, AL, Covington County, AL, Escambia County, AL, Mobile County, AL, Escambia County, FL, Okaloosa County, FL, Santa Rosa County, FL, Walton County, FL, Ascension Parish, LA, Assumption Parish, LA, Iberia Parish, LA, Iberville Parish, LA, Jefferson Parish, LA, Lafourche Parish, LA, Orleans Parish, LA, Plaquemines Parish, LA, Saint Bernard Parish, LA, Saint Charles Parish, LA, Saint James Parish, LA, Saint John the Baptist Parish, LA, Saint Martin Parish, LA, Saint Tammany Parish, LA, St. Mary Parish, LA, Terrebonne Parish, LA, George County, MS, Hancock County, MS, Harrison County, MS, Jackson County, MS, Pearl River County, MS, Stone County, MS

The radar

The Mobile radar (KMOB), 124 km from the middle of the area, began a volume at 16:01 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

Jackson, MS (KJAN), launched 12:00Z, 4.0 hours before the alert went out and 277 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 2005-04-30Temperature 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, Jackson, MS at 12:00Z on 2005-04-30The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -180 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
597 m above ground
0-6 km bulk shear
67 kt
0-1 km storm-relative helicity
-180 m²/s²
0-3 km storm-relative helicity
-81 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
Apr 29, 8:53 PM CDTMesoscale DiscussionSPCBibb, Blount, Calhoun, Cherokee, Clay, Cleburne and 26 more97 min
Apr 29, 9:45 PM CDTTornado WatchSPCColbert, Cullman, Fayette, Franklin, Jackson, Lamar and 9 more7 hr
Apr 30, 1:39 AM CDTMesoscale DiscussionSPCColbert, Cullman, Fayette, Franklin, Jackson, Lamar and 9 more96 min
Apr 30, 2:40 AM CDTTornado WatchSPCBibb, Blount, Calhoun, Cherokee, Choctaw, Cullman and 16 more7 hr
Apr 30, 4:42 AM CDTMesoscale DiscussionSPCAutauga, Baldwin, Bibb, Blount, Bullock, Butler and 43 more93 min
Apr 30, 5:05 AM CDTTornado WatchSPCAutauga, Baldwin, Barbour, Bullock, Butler, Chambers and 25 more7 hr
Apr 30, 6:41 AM CDTMesoscale DiscussionSPCAutauga, Baldwin, Barbour, Bullock, Butler, Chambers and 29 more94 min
Apr 30, 7:10 AM CDTSevere Thunderstorm WatchSPCDale, Geneva, Henry, Houston6 hr
Apr 30, 11:48 AM CDTMesoscale DiscussionSPCBaker, Columbia, Hamilton, Jefferson, Lafayette, Madison and 2 more27 min
Apr 30, 12:05 PM CDTSevere Thunderstorm WatchSPCBaker, Bay, Calhoun, Columbia, Franklin, Gadsden and 11 more5 hr
Apr 29, 10:55 PM CDTMesoscale DiscussionSPCAcadia, Allen, Avoyelles, Beauregard, Calcasieu, Cameron and 8 more2 hr
Apr 30, 1:08 AM CDTMesoscale DiscussionSPCAvoyelles, Concordia, East Baton Rouge, East Feliciana, Iberville, Livingston and 8 more2 hr
Apr 29, 9:23 PM CDTMesoscale DiscussionSPCAlcorn, Benton, Marshall97 min
Apr 30, 2:25 PM CDTMesoscale DiscussionSPCAlcorn, Benton, Marshall95 min

Nearby

Mesoscale Discussions in Louisiana, 2005Mesoscale Discussions in Mississippi, 2005Mesoscale Discussions in Alabama, 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.