Alert archive / Mississippi / Mesoscale Discussions in 2005

Mesoscale Discussion 649

April 22, 200510 counties in Alabama; 16 counties in Mississippi

The Storm Prediction Center issued this mesoscale discussion at Apr 22, 2005, 9:15 AM CDT for 10 counties in Alabama; 16 counties in Mississippi. It was in force for 90 min.

The area

The outline as issued.

The facts

Issued
Apr 22, 2005, 9:15 AM CDT (14:15 UTC)
Expired
Apr 22, 2005, 10:45 AM CDT
In force
90 min
Issued by
the Storm Prediction Center
All 26 counties

Bibb County, AL, Chilton County, AL, Fayette County, AL, Greene County, AL, Hale County, AL, Jefferson County, AL, Pickens County, AL, Shelby County, AL, Sumter County, AL, Tuscaloosa County, AL, Attala County, MS, Choctaw County, MS, Clay County, MS, Holmes County, MS, Kemper County, MS, Leake County, MS, Lowndes County, MS, Madison County, MS, Neshoba County, MS, Newton County, MS, Noxubee County, MS, Oktibbeha County, MS, Rankin County, MS, Scott County, MS, Winston County, MS, Yazoo County, MS

The radar

The Columbus AFB radar (KGWX), 109 km from the middle of the area, began a volume at 14:16 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

Jackson, MS (KJAN), launched 12:00Z, 2.3 hours before the alert went out and 134 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 2005-04-22Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 290 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, Jackson, MS at 12:00Z on 2005-04-22The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 85 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
290 J/kg
Mixed-layer CIN
-119 J/kg
Mixed-layer LCL
1089 m above ground
0-6 km bulk shear
20 kt
0-1 km storm-relative helicity
85 m²/s²
0-3 km storm-relative helicity
105 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.6

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
Apr 21, 9:23 PM CDTMesoscale DiscussionSPCBibb, Blount, Chilton, Colbert, Cullman, Fayette and 15 more97 min
Apr 22, 5:36 AM CDTMesoscale DiscussionSPCColbert, Cullman, Franklin, Jackson, Lauderdale, Lawrence and 5 more84 min
Apr 22, 9:50 AM CDTSevere Thunderstorm WatchSPCAutauga, Bibb, Blount, Calhoun, Chambers, Cherokee and 24 more5 hr
Apr 22, 12:41 PM CDTMesoscale DiscussionSPCAutauga, Bibb, Chambers, Chilton, Clay, Coosa and 12 more64 min
Apr 22, 2:35 PM CDTSevere Thunderstorm WatchSPCAutauga, Barbour, Bibb, Blount, Bullock, Butler and 38 more6 hr
Apr 22, 2:49 PM CDTMesoscale DiscussionSPCColbert, Franklin, Jackson, Lauderdale, Lawrence, Limestone and 2 more86 min
Apr 22, 3:35 PM CDTSevere Thunderstorm WatchSPCColbert, DeKalb, Jackson, Lauderdale, Lawrence, Limestone and 2 more5 hr
Apr 22, 5:40 PM CDTSevere Thunderstorm WatchSPCCalhoun, Cherokee, Cleburne, DeKalb, Etowah, Jackson5 hr
Apr 22, 6:15 PM CDTSevere Thunderstorm WatchSPCBarbour, Coffee, Dale, Geneva, Henry, Houston and 1 more6 hr
Apr 22, 6:40 PM CDTMesoscale DiscussionSPCJackson, Madison95 min
Apr 22, 11:06 AM CDTMesoscale DiscussionSPCAdams, Amite, Claiborne, Copiah, Franklin, Hinds and 8 more114 min
Apr 22, 11:30 AM CDTSevere Thunderstorm WatchSPCAdams, Amite, Claiborne, Copiah, Covington, Franklin and 13 more8 hr
Apr 22, 2:25 PM CDTMesoscale DiscussionSPCAdams, Amite, Claiborne, Copiah, Covington, Franklin and 13 more95 min
Apr 22, 6:40 PM CDTSevere Thunderstorm WatchSPCAdams, Amite, Covington, Forrest, Franklin, Jefferson Davis and 10 more7 hr

Nearby

Mesoscale 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.