Alert archive / Mississippi / Mesoscale Discussions in 2010

Mesoscale Discussion 433

April 30, 20105 counties in Alabama; 24 counties in Mississippi

The Storm Prediction Center issued this mesoscale discussion at Apr 30, 2010, 9:05 PM CDT for 5 counties in Alabama; 24 counties in Mississippi. It was in force for 55 min.

The area

The outline as issued.

The facts

Issued
Apr 30, 2010, 9:05 PM CDT (02:05 UTC)
Expired
Apr 30, 2010, 10:00 PM CDT
In force
55 min
Issued by
the Storm Prediction Center
All 29 counties

Greene County, AL, Hale County, AL, Lamar County, AL, Pickens County, AL, Sumter County, AL, Attala County, MS, Calhoun County, MS, Chickasaw County, MS, Choctaw County, MS, Clay County, MS, Itawamba County, MS, Kemper County, MS, Lafayette County, MS, Lauderdale County, MS, Lee County, MS, Lowndes County, MS, Monroe County, MS, Montgomery County, MS, Neshoba County, MS, Newton County, MS, Noxubee County, MS, Oktibbeha County, MS, Pontotoc County, MS, Prentiss County, MS, Tippah County, MS, Union County, MS, Webster County, MS, Winston County, MS, Yalobusha County, MS

The radar

The Columbus AFB radar (KGWX), 73 km from the middle of the area, began a volume at 02:05 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 00:00Z, 2.1 hours before the alert went out and 170 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 00:00Z on 2010-05-01Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 2770 joules per kilogram.LCLEL10008507005003002001001 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 00:00Z on 2010-05-01The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 215 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
2770 J/kg
Mixed-layer CIN
0 J/kg
Mixed-layer LCL
464 m above ground
0-6 km bulk shear
33 kt
0-1 km storm-relative helicity
215 m²/s²
0-3 km storm-relative helicity
282 m²/s²
Significant tornado parameter
2.9
Supercell composite
15.2

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
May 1, 3:11 AM CDTTornado WatchSPCColbert, Franklin, Lauderdale8 hr
May 1, 6:17 AM CDTMesoscale DiscussionSPCColbert, Franklin, Lauderdale, Marion88 min
May 1, 9:52 AM CDTTornado WatchSPCColbert, Cullman, Fayette, Franklin, Lamar, Lauderdale and 8 more8 hr
May 1, 2:54 PM CDTMesoscale DiscussionSPCColbert, Franklin, Jackson, Lauderdale, Lawrence, Limestone and 3 more66 min
May 1, 5:04 PM CDTMesoscale DiscussionSPCColbert, Cullman, Fayette, Franklin, Jackson, Lamar and 10 more56 min
Apr 30, 11:41 PM CDTMesoscale DiscussionSPCAlcorn, Benton, Bolivar, Coahoma, DeSoto, Itawamba and 14 more64 min
May 1, 12:01 AM CDTTornado WatchSPCAlcorn, Benton, Calhoun, Coahoma, DeSoto, Lafayette and 10 more3 hr
May 1, 2:25 AM CDTMesoscale DiscussionSPCAlcorn, Benton, Bolivar, Calhoun, Coahoma, DeSoto and 14 more95 min
May 1, 7:48 AM CDTMesoscale DiscussionSPCAlcorn, Benton, Bolivar, Calhoun, Carroll, Chickasaw and 25 more57 min
May 1, 11:19 AM CDTMesoscale DiscussionSPCDeSoto, Marshall, Tate, Tunica56 min

Nearby

Mesoscale Discussions in Mississippi, 2010Mesoscale Discussions in Alabama, 2010Every mesoscale discussion in 2010

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.